Drilling tool with replaceable head

Abstract

The utility model discloses a drilling cutter with a replaceable head, which relates to the technical field of drilling cutters and comprises a blade, a cutter body, a cutter handle and a screw. A coupling part is arranged at the bottom of the blade; a screw chute is formed in the bottom of the coupling part; a mounting part is arranged at the top of the cutter body; a screw hole is formed in one side wall of the cutter body; the coupling part at the bottom of the blade is embedded with the mounting part at the top of the cutter body; and the screws are arranged in the screw holes and the screw chutes. According to the cutter, the coupling part at the bottom of the blade is embedded with the mounting part at the top of the cutter body, so that the effect of quickly and accurately positioning and limiting the blade is achieved, the blade is locked by obliquely penetrating the screw through the screw hole and the screw chute, the clamping force of the blade and the cutter body is effectively enhanced, and the mounting precision of the blade is ensured; the connecting stability of the blade and the cutter body is ensured, the torque and strength borne by cutting are enhanced, the structure is simple, and complex machining precision and manufacturing requirements are not needed. Meanwhile, the blade is easy to manufacture and replace, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling tools, in particular to a replaceable head drilling tool. Background Technique

[0002] At present, drilling tools usually adopt high-hardness cemented carbide materials for drilling different types of metal plates to ensure processing quality and accuracy. Generally, drilling tools are integrally designed. After long-term use, the drill bits of the tools are severely worn, and the entire tool must be replaced to ensure the cutting accuracy of the tool, resulting in low tool utilization rate and high replacement cost.

[0003] In related technologies, compared with the integral cemented carbide tool, the replaceable head tool replaces the drill bit separately after wear, improving production efficiency and saving production costs. Currently, the existing types of replaceable head tools are roughly divided into two types: screw locking connection and self-locking connection. The screw locking type has a relatively simple structure. Most structures are positioned by small-diameter round pins and the drill bit is locked by screwing the screw to squeeze the side of the round pin. However, the connection part at the head of the drill bit is relatively thin, and the torque and strength it can withstand are limited. Moreover, unilateral locking easily causes the overall accuracy of the drill bit to decline. The self-locking connection type usually adopts a positioning form to deform the connection part of the tool body for locking and positioning. This method is convenient to operate and has high positioning accuracy. However, the structure is relatively complex and requires high machining accuracy, high manufacturing requirements, and the repeated deformation of the tool body connection part is prone to fatigue, resulting in a decrease in clamping force, and problems such as drill bit detachment and poor machining accuracy during the machining process of the drill bit head. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a replaceable head drilling tool to solve at least one aspect of the problems and defects mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A replaceable head drilling tool, comprising:

[0007] A blade, a tool body, and a screw;

[0008] The blade is symmetrically provided with chip flutes about the central axis of the tool and is communicated with the spiral flutes of the tool body. A cutting part is provided at the top of the blade;

[0009] A coupling part is provided at the bottom of the blade, and a screw inclined groove is provided at the bottom of the coupling part;

[0010] An installation part is provided at the top of the tool body, and screw holes are correspondingly penetrated through the side walls on both sides of the tool body;

[0011] The coupling part at the bottom of the blade is embedded in the installation part at the top of the tool body;

[0012] The screw is passed through the screw hole and the screw chute.

[0013] The replaceable head drilling tool according to this solution has at least the following technical effects:

[0014] The replaceable head drilling tool realizes the effects of quick and accurate positioning and limiting of the blade through the engagement of the coupling part at the bottom of the blade and the installation part at the top of the tool body. Moreover, the space of the installation part at the top of the tool body is slightly larger than that of the coupling part at the bottom of the blade, which is beneficial to the easier engagement of the blade. When the blade is completely embedded in the tool body, the screw is obliquely passed through the screw hole and the screw chute to lock the blade. At this time, the central axis of the blade coincides completely with the central axis of the tool body, effectively enhancing the clamping force between the blade and the tool body and ensuring the installation accuracy of the blade.

[0015] The replaceable head drilling tool ensures the connection stability between the blade and the tool body, enhances the torque and strength borne by the cutting, and has a simple structure without complex machining accuracy and manufacturing requirements. It effectively avoids the fatigue caused by the repeated deformation of the connection part between the blade and the tool body, which may lead to the loosening or falling off of the blade during the machining process, ensuring the cutting accuracy of the tool. At the same time, the blade is easy to manufacture and replace, improving the working efficiency.

[0016] As a further solution of the present utility model: The coupling part at the bottom of the blade includes blade guiding surfaces on both sides. A blade positioning surface is provided at the bottom of the blade guiding surface, and a convex part is formed between the blade guiding surface and the blade positioning surface.

[0017] As a further solution of the present utility model: The installation part at the top of the tool body includes tool body positioning surfaces on both sides. A tool body guiding surface is provided at the top of the tool body positioning surface, and a tool body clamping surface is provided at the top of the tool body guiding surface. A concave part is formed by enclosing the tool body positioning surface, the tool body guiding surface, and the tool body clamping surface, and the convex part of the blade is embedded in the concave part of the tool body.

[0018] Since a convex part is formed between the blade guiding surface and the blade positioning surface, a concave part is formed by enclosing the tool body positioning surface, the tool body guiding surface, and the tool body clamping surface, and the convex part of the blade is embedded in the concave part of the tool body, the blade is embedded in the tool body along the tool body guiding surface through the blade guiding surface, enabling the blade to quickly reach the assembly position. At the same time, the screw is passed through the screw hole and the screw chute to lock the blade, completing the precise assembly.

[0019] As a further solution of the present utility model: A blade clamping surface is provided at the top of the blade guiding surface, and the blade clamping surface is arranged corresponding to the tool body clamping surface.

[0020] As a further solution of the present utility model: The blade guiding surfaces on both sides of the blade are parallel to each other, and the thickness of the top of the blade guiding surface is 1.6 mm - 1.8 mm smaller than the thickness of the bottom of the blade guiding surface.

[0021] Since a blade clamping surface is provided at the top of the blade guiding surface, the blade clamping surface and the tool body clamping surface are correspondingly arranged, and the blade guiding surfaces on both sides of the blade are parallel to each other, so that the side surface of the blade is bounded by the blade guiding surface, presenting a structure that is smaller at the top and larger at the bottom. The thickness of the top of the blade guiding surface is 1.6 mm - 1.8 mm smaller than the thickness of the bottom of the blade guiding surface. Through the thickness difference between the top and the bottom of the blade guiding surface, the blade guiding surface plays a guiding role, ensuring that the blade is guided to the assembly position of the tool body guiding surface through the blade guiding surface. At the same time, this thickness difference enables the bottom of the blade to have sufficient supporting strength, preventing the blade from falling off the tool body, so that the blade can be fixed after being locked by screws with a slight deformation, enhancing the connection reliability between the blade and the tool body, and improving the stability of the tool under high load and vibration conditions, thereby ensuring the cutting accuracy.

[0022] As a further solution of the present utility model: The angle of the blade positioning surface is the same as the angle of the tool body positioning surface, and the angles are both 130° - 160°, and both angles are bisected by the central axis of the tool.

[0023] Since the angle of the blade positioning surface is the same as the angle of the tool body positioning surface, and the angles are both 130° - 160°, and both angles are bisected by the central axis of the tool, the blade positioning surface has sufficient supporting strength, enhancing the torque and strength borne by the cutting, reducing the damage and wear of the blade caused by local stress. At the same time, under the action of gravity, the central axis of the blade in the X direction and the central axis of the tool body are quickly aligned, reducing the error generated during the installation of the blade, and improving the stability and accuracy of the blade cutting.

[0024] As a further solution of the present utility model: The included angle between the screw inclined groove and the normal direction of the blade surface is 8° - 15°, and it is correspondingly arranged with the included angle between the screw hole and the normal direction of the tool body surface.

[0025] Since the included angle between the screw inclined groove and the normal direction of the blade surface is 8° - 15°, and it is correspondingly arranged with the included angle between the screw hole and the normal direction of the tool body surface, the adaptability between the screw inclined groove and the screw hole is ensured. The inclined angle of the screw inclined groove enables sufficient space to be set for the screw hole on the tool body, ensuring the effective locking of the tool and guaranteeing the connection stability between the blade and the tool body; and the inclined angle of the screw inclined groove can increase the space of the spiral groove of the tool body, improving the chip removal ability of the chip removal groove.

[0026] As a further solution of the present utility model: The angle of the screw inclined groove in the vertical direction is perpendicular to the blade positioning surface on the same side, and the height ≤ 0.5 times the height of the blade.

[0027] Since the angle of the screw chute in the vertical direction is perpendicular to the positioning surface of the blade on the same side, and the height is ≤ 0.5 times the height of the blade, the height of the screw chute is controlled as much as possible without affecting the passage of the screw, avoiding affecting the structural strength of the blade, and providing sufficient space for the guiding surface of the blade. Through reasonable design, the connection stability and structural strength of the blade are ensured.

[0028] As a further solution of the present utility model: an included angle is formed between the guiding surface of the blade and the central axis of the tool, and the included angle is 0.5 times the included angle of the positioning surface of the blade.

[0029] Since an included angle is formed between the guiding surface of the blade and the central axis of the tool, and the included angle is 0.5 times the included angle of the positioning surface of the blade, the guiding surface of the blade is parallel to the positioning surface of the blade on the same side, facilitating the alignment and fixation of the blade during installation, simplifying the installation process of the blade, and reducing the installation error, thereby improving the machining accuracy and consistency of the tool.

[0030] As a further solution of the present utility model: the distance between the guiding surface of the blade and the positioning surface of the blade on the same side is less than the distance between the guiding surface of the tool body and the positioning surface of the tool body on the same side.

[0031] Since the distance between the guiding surface of the blade and the positioning surface of the blade on the same side is less than the distance between the guiding surface of the tool body and the positioning surface of the tool body on the same side, during the installation and disassembly process, the guiding surfaces of the blade and the tool body only play a guiding role; after the blade is installed, the guiding surfaces of the blade and the tool body do not contact, avoiding wear and deformation of the guiding surfaces of the blade and the tool body, and avoiding precision problems that may cause the blade to be unable to be smoothly installed on the tool body, thereby ensuring the convenience and precision of blade installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] For the convenience of those skilled in the art to understand, the present utility model will be further described below with reference to the accompanying drawings.

[0033] Figure 1 It is a schematic structural diagram of a replaceable head drilling tool;

[0034] Figure 2 It is an exploded structural diagram of a replaceable head drilling tool;

[0035] Figure 3 It is Figure 2 a partial enlarged view of part A in

[0036] Figure 4 It is Figure 2 a partial enlarged view of part B in

[0037] Figure 5 a schematic structural diagram of the tool body of a replaceable head drilling tool;

[0038] Figure 6 is Figure 5 a side view structural schematic diagram of

[0039] Reference numerals:

[0040] 1. Blade; 11. Chip groove; 12. Cutting part; 13. Screw inclined groove; 14. Blade guiding surface; 15. Blade positioning surface; 16. Blade clamping surface; 2. Tool body; 21. Screw hole; 22. Tool body positioning surface; 23. Tool body guiding surface; 24. Tool body clamping surface; 3. Screw. Specific embodiments

[0041] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0042] In the description of the present invention, it should be understood that for the orientation description, such as the upper, lower, front, rear, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0043] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more. Understanding of greater than, less than, exceeding, etc. does not include the present number, and understanding of above, below, within, etc. includes the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0044] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

[0045] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model, that is, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings herein can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present utility model.

[0047] As Figures 1-6 shown in the embodiments of the present utility model, a replaceable head drilling tool includes: a blade 1, a tool body 2 and a screw 3; the blade 1 is symmetrically provided with a chip removal groove 11 with respect to the central axis of the tool, and is communicated with the spiral groove of the tool body 2. A cutting portion 12 is provided at the top of the blade 1; a coupling portion is provided at the bottom of the blade 1, and a screw inclined groove 13 is provided at the bottom of the coupling portion; an installation portion is provided at the top of the tool body 2, and screw holes 21 are correspondingly provided through the side walls on both sides of the tool body 2; the coupling portion at the bottom of the blade 1 is embedded in the installation portion at the top of the tool body 2; the screw 3 is passed through the screw hole 21 and the screw inclined groove 13.

[0048] Specifically, the replaceable head drilling tool realizes the effect of quickly and accurately positioning and limiting the blade 1 through the fitting of the coupling portion at the bottom of the blade 1 and the installation portion at the top of the tool body 2, and the space of the installation portion at the top of the tool body 2 is slightly larger than the coupling portion at the bottom of the blade 1, which is beneficial to the easier fitting of the blade 1; when the blade 1 is completely embedded in the tool body, the screw 3 obliquely passes through the screw hole 21 and the screw inclined groove 13, so that the blade 1 is locked. At this time, the central axis of the blade 1 coincides completely with the central axis of the tool body 2, effectively enhancing the clamping force between the blade 1 and the tool body 2 and ensuring the installation accuracy of the blade 1.

[0049] The replaceable head drilling tool ensures the connection stability between the blade 1 and the tool body 2, enhances the torque and strength borne by the cutting, and has a simple structure without complex machining accuracy and manufacturing requirements, effectively avoiding the fatigue caused by the repeated deformation of the connection part between the blade 1 and the tool body 2, resulting in the loosening or falling off of the blade 1 during the machining process, ensuring the cutting accuracy of the tool. At the same time, the blade 1 is easy to manufacture and replace, improving the work efficiency.

[0050] As Figure 3 and Figure 4As shown, the coupling part at the bottom of the blade 1 includes blade guiding surfaces 14 on both sides. A blade positioning surface 15 is provided at the bottom of the blade guiding surface 14, and a convex part is formed between the blade guiding surface 14 and the blade positioning surface 15. The installation part at the top of the tool body 2 includes tool body positioning surfaces 22 on both sides. A tool body guiding surface 23 is provided at the top of the tool body positioning surface 22, and a tool body clamping surface 24 is provided at the top of the tool body guiding surface 23. A concave part is formed by enclosing the tool body positioning surface 22, the tool body guiding surface 23, and the tool body clamping surface 24. The convex part of the blade 1 is embedded in the concave part of the tool body 2.

[0051] Specifically, since a convex part is formed between the blade guiding surface 14 and the blade positioning surface 15, and a concave part is formed by enclosing the tool body positioning surface 22, the tool body guiding surface 23, and the tool body clamping surface 24, and the convex part of the blade 1 is embedded in the concave part of the tool body 2, the blade 1 is inserted into the tool body 2 along the tool body guiding surface 23 through the blade guiding surface 14, enabling the blade 1 to quickly reach the assembly position. At the same time, the screw 3 is inserted into the screw hole 21 and the screw chute 13 to lock the blade 1, completing the precise assembly. And during the tool withdrawal process after machining, the cooperation between the convex part of the blade 1 and the concave part of the tool body 2 can effectively prevent the blade 1 from falling off the tool body 2, ensuring the safety of operation.

[0052] As Figure 3 and Figure 4 shown, a blade clamping surface 16 is provided at the top of the blade guiding surface 14, and a tool body clamping surface 24 is provided at the top of the tool body guiding surface 23. The blade clamping surface 16 and the tool body clamping surface 24 are correspondingly arranged. The blade guiding surfaces 14 on both sides of the blade 1 are parallel to each other, and the thickness of the top of the blade guiding surface 14 is 1.6 mm - 1.8 mm smaller than the thickness of the bottom of the blade guiding surface 14.

[0053] Specifically, since a blade clamping surface 16 is provided at the top of the blade guiding surface 14, the blade clamping surface 16 and the tool body clamping surface 24 are correspondingly arranged, and the blade guiding surfaces 14 on both sides of the blade 1 are parallel to each other, the side of the blade 1 has a structure with a smaller upper part and a larger lower part bounded by the blade guiding surface 14. The thickness of the top of the blade guiding surface 14 is 1.6 mm - 1.8 mm smaller than the thickness of the bottom of the blade guiding surface 14. Due to the thickness difference between the top and the bottom of the blade guiding surface 14, the blade guiding surface 14 plays a guiding role, ensuring that the blade 1 is guided to the assembly position of the tool body guiding surface 23 through the blade guiding surface 14. At the same time, this thickness difference provides sufficient support strength at the bottom of the blade 1 to prevent the blade 1 from falling off the tool body 2, enabling the blade 1 to be fixed after a slight deformation when locked by the screw 3, enhancing the connection reliability between the blade 1 and the tool body 2, and improving the stability of the tool under high load and vibration conditions, thus ensuring the cutting accuracy.

[0054] Further, the angles between the blade positioning surface 15 and the tool body positioning surface 22 are the same, both being 130° - 160°, and these angles are bisected by the central axis of the tool.

[0055] Specifically, since the angles between the blade positioning surface 15 and the tool body positioning surface 22 are the same, both being 130° - 160°, and these angles are bisected by the central axis of the tool, the blade positioning surface 15 has sufficient support strength, enhancing the torque and strength borne by the cutting, reducing the damage and wear of the blade 1 caused by local stress. At the same time, under the action of gravity, the central axis of the blade 1 in the X direction quickly aligns with the central axis of the tool body 2, reducing the error generated during the installation of the blade 1 and improving the cutting stability and accuracy of the blade 1.

[0056] According to an embodiment of the present invention, the angle between the screw chute 13 and the normal direction of the surface of the blade 1 is 8° - 15°, and it is correspondingly set with the angle between the screw hole 21 and the normal direction of the surface of the tool body 2.

[0057] Specifically, since the angle between the screw chute 13 and the normal direction of the surface of the blade 1 is 8° - 15°, and it is correspondingly set with the angle between the screw hole 21 and the normal direction of the surface of the tool body 2, the matching degree between the screw chute 13 and the screw hole 21 is ensured. The inclination angle of the screw chute 13 allows sufficient space for the screw hole 21 to be arranged on the tool body 2, ensuring the effective locking of the blade 1 and guaranteeing the connection stability between the blade 1 and the tool body 2; and the inclination angle of the screw chute 13 can increase the space of the spiral groove of the tool body 2, improving the chip removal ability of the chip removal groove 11.

[0058] Further, the angle of the screw chute 13 in the vertical direction is perpendicular to the blade positioning surface 15 on the same side, and the height ≤ 0.5 times the height of the blade 1.

[0059] Specifically, since the angle of the screw chute 13 in the vertical direction is perpendicular to the blade positioning surface 15 on the same side, and the height ≤ 0.5 times the height of the blade 1, the height of the screw chute 13 is controlled as much as possible without affecting the passing of the screw 3, avoiding affecting the structural strength of the blade 1, and providing sufficient space for the blade guiding surface 14. Through reasonable design, the connection stability and structural strength of the blade 1 are guaranteed.

[0060] According to an embodiment of the present invention, the blade guiding surface 14 forms an angle with the central axis of the tool, and this angle is 0.5 times the angle of the blade positioning surface 15.

[0061] Specifically, since the blade guiding surface 14 forms an angle with the tool center axis, and this angle is 0.5 times the angle of the blade positioning surface 15, the blade guiding surface 14 is parallel to the blade positioning surface 15 on the same side, which facilitates the alignment and fixation of the blade 1 during installation, simplifies the installation process of the blade 1, and reduces the installation error, thereby improving the machining accuracy and consistency of the tool.

[0062] Furthermore, the width of the screw inclined groove 13 is 0.2 mm - 0.6 mm greater than the diameter of the screw 3, and the direction of the screw inclined groove 13 is correspondingly set with the direction of the screw hole 21.

[0063] Specifically, since the width of the screw inclined groove 13 is 0.2 mm - 0.6 mm greater than the diameter of the screw 3, and the direction of the screw inclined groove 13 is correspondingly set with the direction of the screw hole 21, the screw 3 passing through the screw hole 21 and the screw inclined groove 13 can achieve the function of fixing the blade 1. Compared with the traditional manufacturing method of drilling in the blank pressing stage, the inclined groove method greatly reduces the manufacturing difficulty, saves the production cost, and improves the production efficiency.

[0064] In addition, it should be noted that the distance between the blade guiding surface 14 and the blade positioning surface 15 on the same side is less than the distance between the tool body guiding surface 23 and the tool body positioning surface 22 on the same side.

[0065] Specifically, since the distance between the blade guiding surface 14 and the blade positioning surface 15 on the same side is less than the distance between the tool body guiding surface 23 and the tool body positioning surface 22 on the same side, during the installation and disassembly process, the blade guiding surface 14 and the tool body guiding surface 23 only play a guiding role; after the blade 1 is installed, the blade guiding surface 14 and the tool body guiding surface 23 do not contact, avoiding wear and deformation of the blade guiding surface and the tool body guiding surface, thereby ensuring the convenience and accuracy of the blade 1 installation.

[0066] The above content is only an example and explanation of the structure of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, they should all belong to the protection scope of the present invention.

Claims

1. A replaceable-head drilling tool, characterized in that, Comprising: A blade (1), a tool body (2) and a screw (3); The blade (1) is symmetrically provided with a chip removal groove (11) with respect to the central axis of the tool, and is communicated with the spiral groove of the tool body (2). A cutting part (12) is arranged at the top of the blade (1); A coupling part is arranged at the bottom of the blade (1), and a screw inclined groove (13) is arranged at the bottom of the coupling part; An installation part is arranged at the top of the tool body (2), and screw holes (21) are correspondingly arranged through the side walls on both sides of the tool body (2); The coupling part at the bottom of the blade (1) is embedded in the installation part at the top of the tool body (2); The screw (3) is arranged through the screw hole (21) and the screw inclined groove (13); 2. The replaceable head drilling tool according to claim 1, characterized in that, The coupling part at the bottom of the blade (1) includes blade guiding surfaces (14) on both sides. A blade positioning surface (15) is arranged at the bottom of the blade guiding surface (14). A convex part is formed between the blade guiding surface (14) and the blade positioning surface (15); 3. The replaceable-tip drilling tool according to claim 2, wherein The installation part at the top of the tool body (2) includes tool body positioning surfaces (22) on both sides. A tool body guiding surface (23) is arranged at the top of the tool body positioning surface (22). A tool body clamping surface (24) is arranged at the top of the tool body guiding surface (23). A concave part is formed by enclosing the tool body positioning surface (22), the tool body guiding surface (23) and the tool body clamping surface (24). The convex part of the blade (1) is embedded in the concave part of the tool body (2); 4. The replaceable head drilling tool according to claim 3, characterized in that, A blade clamping surface (16) is arranged at the top of the blade guiding surface (14), and the blade clamping surface (16) is correspondingly arranged with the tool body clamping surface (24); 5. The replaceable head drilling tool according to claim 4, characterized in that, The blade guiding surfaces (14) on both sides of the blade (1) are parallel to each other. The thickness of the top of the blade guiding surface (14) is 1.6 mm - 1.8 mm smaller than the thickness of the bottom of the blade guiding surface (14); 6. The replaceable head drill tool according to claim 3, characterized in that, The angles of the blade positioning surface (15) and the tool body positioning surface (22) are the same, both being 130° - 160°, and both angles are bisected by the central axis of the tool; 7. The replaceable head drilling tool according to claim 1, characterized in that, The included angle between the screw inclined groove (13) and the normal of the blade (1) surface is 8° - 15°, and is correspondingly arranged with the included angle between the screw hole (21) and the normal of the tool body (2) surface; 8. The replaceable head drilling tool according to claim 7, characterized in that, The angle of the screw inclined groove (13) in the vertical direction is perpendicular to the same-side blade positioning surface (22), and the height ≤ 0.5 times the height of the blade (1); 9. The replaceable head drilling tool according to claim 3, characterized in that, The blade guiding surface (14) forms an included angle with the central axis of the tool, and this included angle is 0.5 times the included angle of the blade positioning surface (15); 10. The replaceable head drilling tool according to claim 3, characterized in that, The distance between the blade guiding surface (14) and the same-side blade positioning surface (15) is smaller than the distance between the tool body guiding surface (23) and the same-side tool body positioning surface (22);

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