Clamping and positioning tool for assisting manual grinding forming drill bit

Abstract

The utility model relates to the technical field of manual grinding of formed drill bits, and particularly discloses an auxiliary manual grinding formed drill bit clamping and positioning tool which comprises a corner bracket, a limiting block, a rotary shaft and an angle forming mold, a positioning hole used for fixing the limiting block is formed in the corner bracket, and a vertically-downward threaded rod is arranged at the bottom of the limiting block and matched with the positioning hole. A nut is matched with the threaded rod to fix the limiting block and the corner bracket, a horizontal mounting hole is formed in the limiting block, a rotatable shaft is coaxially arranged in the mounting hole, the rotatable shaft can freely rotate in the mounting hole, a through hole allowing the angle forming die to penetrate through is formed in the rotatable shaft along the axis, and the through hole and the angle forming die are coaxially arranged; the head of the angle forming die is a cone, the cone angle is consistent with the vertex angle of the drill bit in size, the accuracy of grinding the vertex angle of the drill bit and the symmetry degree of main cutting edges on the two sides can be guaranteed, the structure is simple and reliable, and the machining cost is low.

Description

Technical Field

[0001] This utility model relates to the field of manual grinding technology for shaped drill bits, specifically a clamping and positioning tool for assisting manual grinding of shaped drill bits. Background Technology

[0002] The point angle of a drill bit is the angle between the cutting edge and the working surface. It is a key indicator for measuring the cutting ability and stability of a drill bit. When using a drill bit, the main cutting edge of its head needs to be ground. Currently, drill bits are ground manually on a grinding wheel or using a drill grinder. Due to the high price of drill grinders, most factories use the cheaper grinding wheel to grind drill bits. When manually grinding drill bits on a grinding wheel, the angle of the main cutting edge can only be controlled by the worker's experience and measured with an angle gauge. Hand-grinding drill bits requires a high level of skill, and the point angle of the drill bit cannot be accurately controlled, making it difficult to ensure the symmetry of the main cutting edges on both sides of the drill bit. Utility Model Content

[0003] To address the shortcomings of existing technologies, the technical problem solved by this utility model is to provide an auxiliary tooling for clamping and positioning drill bits during manual grinding, thereby solving the problem of not being able to accurately control the angle of the main cutting edge when manually grinding drill bits.

[0004] To solve the above problems, the technical solution adopted by this utility model is: an auxiliary tool for clamping and positioning drill bits for manual grinding, including an angle bracket, a limiting block, a rotatable shaft, and an angle forming mold. The angle bracket is provided with a positioning hole for fixing the limiting block. The bottom of the limiting block is provided with a vertically downward threaded rod that cooperates with the positioning hole. A nut is used to cooperate with the threaded rod to fix the limiting block to the angle bracket. The limiting block is provided with a horizontal mounting hole. A rotatable shaft is coaxially provided in the mounting hole. The rotatable shaft is cylindrical in shape and has a frustum on its outer surface. The rotatable shaft can rotate freely in the mounting hole. The rotatable shaft has a through hole along its axis through which the angle forming mold can pass. The angle forming mold is coaxially arranged with the through hole. The side wall of the rotatable shaft is provided with a radially threaded hole that communicates with the through hole. A stop screw is provided in the threaded hole. The stop screw is used to limit the drill bit. The angle forming mold is cylindrical in shape. The head of the angle forming mold is conical, and the cone angle is the same as the apex angle of the drill bit.

[0005] Furthermore, the angle forming mold can be used for various angle specifications.

[0006] Furthermore, the corner bracket is provided with a waist-shaped hole for fixing the corner bracket, and the corner bracket is fixed by passing bolts through the waist-shaped hole.

[0007] Furthermore, the main body of the limiting block is a cuboid structure, and the frustum of the rotatable shaft protrudes from the side of the limiting block.

[0008] Furthermore, the nut is a lock nut.

[0009] Furthermore, a clamping head is coaxially provided on the rotatable shaft.

[0010] The beneficial effects of this solution are as follows: Compared with the prior art, the auxiliary manual grinding and forming drill bit clamping and positioning fixture of this utility model can accurately adjust the angle of the limiting block by setting a limiting block and an angle forming mold, thereby ensuring the angle of the grinding drill bit. The use of a rotatable shaft to assist manual grinding of the drill bit ensures the accuracy of the grinding drill bit tip angle and the symmetry of the two main cutting edges. The structure is simple and reliable, and the processing cost is low. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is an exploded view of the present invention;

[0013] Figure 3 This is a schematic diagram of the angle forming mold of this utility model;

[0014] Figure 4 This is a schematic diagram of the present invention when adjusting the angle of the limiting block;

[0015] Figure 5 This is a schematic diagram of the process of grinding the drill bit according to this utility model;

[0016] In the diagram: 1-Angle frame, 2-Limit block, 3-Rotating shaft, 4-Angle forming mold, 5-Drill bit, 6-Nut, 7-Stop screw, 8-Grinding wheel, 11-Positioning hole, 12-Oval hole, 21-Mounting hole, 31-Through hole, 32-Frustum. Detailed Implementation

[0017] 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.

[0018] Example 1 is attached. Figures 1 to 5As shown: A fixture for clamping and positioning drill bits that assists in manual grinding includes an angle bracket 1, a limiting block 2, a rotatable shaft 3, and an angle forming mold 4. The angle bracket 1 has a positioning hole 11 for fixing the limiting block 2. The bottom of the limiting block 2 has a vertically downward threaded rod that engages with the positioning hole 11. A nut 6 is used to fix the limiting block 2 to the angle bracket 1 in conjunction with the threaded rod. The limiting block 2 has a horizontal mounting hole 21. The rotatable shaft 3 is coaxially mounted in the mounting hole 21. The rotatable shaft 3 is a cylinder with a frustum 32 on its outer surface. The frustum 32 can limit the axial movement of the rotatable shaft 3 within the limiting block 2, and the rotatable shaft 3 can be rotated by hand to position the drill bit. The head 5 is ground. The rotatable shaft 3 can rotate freely in the mounting hole 21. The rotatable shaft 3 has a through hole 31 along its axis through which the angle forming mold 4 can pass. The angle forming mold 4 is coaxially set with the through hole 31. The side wall of the rotatable shaft 3 has a radial threaded hole that communicates with the through hole 31. A stop screw 7 is provided in the threaded hole. The stop screw 7 is used to limit the drill bit 5 and prevent the drill bit 5 from moving along its axis and rotating on its own. When grinding drill bits 5 of different diameter specifications, the corresponding rotatable shaft 3 can be replaced. The angle forming mold 4 is cylindrical in shape. The head of the angle forming mold 4 is conical. The cone angle is the same as the apex angle of the drill bit 5. The angle forming mold 4 is used to adjust the angle of the limit block 2.

[0019] The angle forming mold 4 can be used for various angle specifications, such as Figure 3 As shown, the difference between the angle forming mold 4 and the drill bit 5 is that the angle forming mold 4 does not have a cutting edge. The angle forming mold 4 can be set with various angle specifications for use, corresponding to the angles of the commonly used drill bit 5 tip angles, including but not limited to 118°, 120°, 130°, 140°, etc. The angle can be marked on the angle forming mold 4 for quick use. The angle bracket 1 is provided with a waist-shaped hole 12 for fixing the angle bracket 1. The angle bracket 1 is fixed by using bolts through the waist-shaped hole 12. The angle bracket 1 can be installed on the frame of the grinding wheel machine or the worktable of the grinding machine. The waist-shaped hole 12 can adjust the position of the angle bracket 1 relative to the grinding wheel 8 within a certain range. The main body of the limiting block 2 is a cuboid structure. The frustum 32 of the rotatable shaft 3 protrudes from the side of the limiting block 2 for easy hand operation. The nut 6 is an anti-loosening nut 6 to prevent the nut 6 from loosening due to vibration of the limiting block 2 during grinding.

[0020] The specific implementation process is as follows:

[0021] Secure the angle bracket 1 to the frame of the grinding machine or the worktable of the external cylindrical punching machine using bolts. Install the limit block 2 and the rotatable shaft 3. Do not fix the limit block 2 at this time. Select an angle forming mold 4 that corresponds to the required tip angle of the drill bit 5 to be ground. Insert the mold 4 into the rotatable shaft 3 and adjust the angle of the limit block 2. Figure 4As shown, the head of the angle forming mold 4 is flush with and tightly attached to the surface of the grinding wheel 8, with the contact point positioned above the diameter of the horizontal plane of the grinding wheel 8. During grinding, the lower part of the drill bit 5 contacts the grinding wheel 8, ensuring high safety. At this time, tighten the nut 6 at the bottom of the limiting block 2 to fix the limiting block 2. Remove the angle forming mold 4 and insert the drill bit 5 to be ground into the rotatable shaft 3. A certain distance is reserved between the frustum 32 on the rotatable shaft 3 and the limiting block 2. During the grinding process, the drill bit 5 will move towards the grinding wheel 8. The reserved distance can prevent excessive movement, ensuring the drill bit 5 moves towards the grinding wheel 8. The main cutting edge of drill bit 5 is close to the surface of grinding wheel 8. Tighten the stop screw 7 to fix and limit drill bit 5. Start the grinding machine and rotate the hand-held rotary shaft 3 to make the head of drill bit 5 contact the grinding wheel 8 circumferentially for grinding. Since the angle forming mold 4 is used to adjust the angle of the limiting block 2, the apex angle of drill bit 5 after grinding is consistent with the cone angle of angle forming mold 4. During the grinding process, the angle between the axis of drill bit 5 and the surface of grinding wheel 8 remains unchanged, which can ensure the symmetry of the main cutting edges on both sides. This tooling structure is simple and reliable, the grinding angle is accurate, and the processing cost is low.

[0022] Example 2: Unlike Example 1, a clamping head is installed on the rotatable shaft 3. The clamping head is coaxially arranged with the rotatable shaft 3, which can realize the quick clamping of the angle forming mold 4 and the drill bit 5 and can realize the clamping of drill bits 5 with different diameter specifications.

[0023] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A fixture for clamping and positioning drill bits that assists in manual grinding and forming, characterized in that: The device includes a corner bracket, a limiting block, a rotatable shaft, and an angle forming mold. The corner bracket has a positioning hole for fixing the limiting block. The bottom of the limiting block has a vertically downward threaded rod that engages with the positioning hole. A nut is used to engage with the threaded rod to fix the limiting block to the corner bracket. The limiting block has a horizontal mounting hole. A rotatable shaft is coaxially mounted in the mounting hole. The rotatable shaft is cylindrical with a frustum on its outer surface. The rotatable shaft can rotate freely in the mounting hole. The rotatable shaft has a through hole along its axis through which the angle forming mold can pass. The angle forming mold is coaxially mounted with the through hole. The side wall of the rotatable shaft has a radially threaded hole communicating with the through hole. A stop screw is installed in the threaded hole to limit the drill bit. The angle forming mold is cylindrical, and the head of the angle forming mold is conical. The cone angle is the same size as the apex angle of the drill bit.

2. The auxiliary manual grinding and forming drill bit clamping and positioning fixture according to claim 1, characterized in that: The angle forming mold can be used for various angle specifications.

3. The auxiliary manual grinding and forming drill bit clamping and positioning fixture according to claim 1, characterized in that: The corner bracket is provided with a waist-shaped hole for fixing the corner bracket, and the corner bracket is fixed by passing bolts through the waist-shaped hole.

4. The auxiliary manual grinding and forming drill bit clamping and positioning fixture according to claim 1, characterized in that: The main body of the limiting block is a cuboid structure, and the frustum of the rotatable shaft protrudes from the side of the limiting block.

5. The auxiliary manual grinding and forming drill bit clamping and positioning fixture according to claim 1, characterized in that: The nut is a lock nut.

6. The auxiliary manual grinding and forming drill bit clamping and positioning fixture according to claim 1, characterized in that: A clamping head is coaxially provided on the rotatable shaft.

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