Mirror surface drill with high-precision hole requirement

Abstract

The utility model relates to the technical field of machining tools, and discloses a high-precision hole requirement mirror surface drill which comprises a tool handle and a cutting part, a transition part is arranged at one end of the tool handle, the cutting part is arranged at one end of the transition part, the cutting part comprises a drill tip, the drill tip is arranged at one end of the cutting part, and a front tool face is arranged on the side wall of the cutting part. A cutting edge is arranged on one side of the front cutter face, the section of the rear cutter back is semicircular, the front cutter face is located at the plane position of the rear cutter back, the cutting edge provides stronger support through the whole semicircular rear cutter back, vibration in the machining process is reduced, and therefore machining stability is improved. The improvement of the stability is beneficial to reducing surface flaws, such as tool marks and scratches, and is beneficial to realizing a mirror surface effect.

Description

Technical Field

[0001] The utility model relates to the technical field of machining tools, in particular to a mirror drill requiring high-precision holes. Background Art

[0002] In the traditional machining field, the tools generally used for machining stainless steel are alloy twist drills or flat drills. Flat drills are better than twist drills in terms of hole accuracy and machining surface finish. However, the machining finish of 0.4 can generally be achieved, but it cannot be achieved if it is required to be above 0.2. Since stainless steel has a higher hardness, the hardness is generally HRC56-58, which is more difficult to process than general materials. The finish and accuracy are both deviated, and scratches, lines, and the hole surface is prone to hemp and burns. Twist drills and ordinary flat drills cannot meet the product processing requirements; in order to solve the above problems, a high-precision hole mirror drill is specially designed to solve the above problems. Utility Model Content

[0003] The utility model aims to provide a high-precision hole requiring a mirror drill to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-precision hole requiring a mirror drill, comprising: a tool handle, a back blade and a cutting portion, one end of the tool handle is provided with a transition portion, one end of the transition portion is provided with a cutting portion, the cutting portion comprises a drill tip, one end of the cutting portion is a drill tip, a side wall of the cutting portion is provided with a rake face, one side of the rake face is provided with a cutting edge, the cross section of the back blade is semicircular, and the rake face is located at the plane portion of the back blade;

[0005] The drill tip is a semicircular single-edged centering tip structure; one end of the cutting edge is connected to the single-edged edge of the drill tip, the transition portion is a truncated cone, and the transition portion is connected to the cutting portion and the tool handle by an arc transition.

[0006] Furthermore, the angle between the front cutting surface and the horizontal line is 89-85 degrees.

[0007] Furthermore, one end of the tool handle is provided with a chamfer, and the front cutting surface is used for chip removal during drilling.

[0008] Compared with the prior art, the beneficial effects of the utility model are:

[0009] The utility model realizes that when a mirror drill is used for high-precision holes requiring mirror drilling, the semicircular structure design of the rear blade back is combined with the semicircular single-edge centering structure of the drill tip. The design of the semicircular single-edge centering tip structure helps to improve the centering of the drilling hole, thereby improving the processing accuracy. Traditional drill bits may cause hole position deviation due to poor centering, while the semicircular single-edge design ensures the strength of the drill tip and can effectively reduce the occurrence of hole position deviation through the contact between the single edge and the workpiece. The semicircular rear blade back forms an extra-large front blade surface, which enhances the bending stiffness and torsional stiffness of the drill bit. This is particularly important for deep hole processing, because the drill bit is prone to vibration and deformation during deep hole processing, which affects the processing quality and precision. At the same time, the extra-large front blade surface design helps to discharge a large amount of chips, avoid chip blockage, reduce the consumption of cutting fluid, and at the same time reduce tool wear and increase the service life of the tool.

[0010] The cutting edge provides stronger support through the entire semicircular back of the blade, reducing vibration during processing, thereby improving processing stability. The improved stability helps reduce surface defects such as knife marks and scratches, which is conducive to achieving a mirror effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a front view of a high-precision hole requiring mirror drilling in the utility model;

[0012] Figure 2 This is a left view of a high-precision hole requiring mirror drilling in the utility model;

[0013] Figure 3 This is a stereoscopic diagram of a high-precision hole requiring mirror drilling in the utility model.

[0014] In the figure: 1, chamfer; 2, tool handle; 3, transition part; 4, back of the blade; 5, front blade face; 6, cutting edge; 7, drill tip. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0016] See also Figure 1-Figure 3The utility model provides a technical solution: a mirror drill for high-precision holes, comprising: a shank 2 and a cutting part, a transition part 3 is provided at one end of the shank 2, a cutting part is provided at one end of the transition part 3, the cutting part comprises a drill tip 7, one end of the cutting part is the drill tip 7, a rake face 5 is provided on the side wall of the cutting part, a cutting edge 6 is provided on one side of the rake face 5, a rear blade back 4 has a semicircular cross section, and the rake face 5 is located on the plane of the rear blade back 4. The cutting edge 6 provides stronger support through the entire semicircular rear blade back 4, reduces vibration during processing, and thus improves processing stability. The improvement in stability helps to reduce surface defects, such as knife marks, scratches, etc., and is conducive to achieving a mirror effect.

[0017] The drill tip 7 is a semicircular single-edge centering tip structure. The design of the semicircular single-edge centering tip structure helps to improve the centering of the drill hole, thereby improving the processing accuracy. The conventional drill bit may cause the position deviation of the hole due to its poor centering performance, while the semicircular single-edge design ensures the strength of the drill tip 7 and can effectively reduce the occurrence of hole position deviation through the contact between the single edge and the workpiece.

[0018] The angle between the front cutting edge 5 and the horizontal line is 89-85 degrees. The front cutting edge 5 is set at a certain slope, which can make the tool sharper and reduce the resistance during cutting, thereby reducing cutting. At the same time, it helps to guide the chips to be discharged along a predetermined path, avoiding chip blockage or scratching the processed surface, affecting the processing quality.

[0019] One end of the cutting edge 6 is connected to the single cutting edge of the drill tip 7 .

[0020] The transition part 3 is truncated cone-shaped, and the transition part 3 is connected with the cutting part and the tool handle 2 by an arc transition, which reduces stress and increases the service life of the tool. A chamfer 1 is provided at one end of the tool handle 2, and the front cutting edge 5 is used for chip removal during drilling. The chamfer 1 helps to ensure that the connection between the tool handle 2 and the machine tool spindle has better concentricity and improves the stability during the processing. By chamfering the tool handle, the vibration caused by imbalance can be reduced, thereby improving the stability and accuracy of the processing process; the chamfer 1 can eliminate burrs generated during machining and prevent burrs from causing interference or damage in subsequent processes; the chamfer 1 can make the edge of the tool handle 2 smoother, facilitate the insertion and positioning of the tool handle 2 during the assembly process, and reduce the difficulty and time of assembly.

[0021] When mirror drills are required for high-precision holes, the semicircular structure design of the back of the blade, combined with the semicircular single-edge centering structure of the drill tip, can help improve the centering of the drill hole, thereby improving the processing accuracy. Traditional drill bits may cause hole position deviation due to poor centering, while the semicircular single-edge design ensures the strength of the drill tip 7. At the same time, the contact between the single edge and the workpiece can effectively reduce the occurrence of hole position deviation. The back of the blade 4 with a semicircular structure forms an oversized front blade surface 5, which enhances the bending and torsional rigidity of the drill bit. This is especially important for deep hole processing, because the drill bit is prone to vibration and deformation during deep hole processing, affecting the processing quality and accuracy. At the same time, the oversized front blade surface design helps to discharge a large amount of chips, avoid chip blockage, reduce the consumption of cutting fluid, and at the same time reduce tool wear and increase the service life of the tool.

[0022] The cutting edge 6 provides stronger support through the entire semicircular back blade 4, reducing vibration during processing, thereby improving processing stability. The improved stability helps to reduce surface defects such as knife marks, scratches, etc., which is conducive to achieving a mirror effect.

[0023] The semicircular design has no forced air, and the chips can better contact the front cutting edge 5 during the cutting process, which helps to achieve a more continuous and uniform cutting process. Uniform cutting can reduce surface unevenness and roughness, thereby achieving a smoother surface treatment; at the same time, it helps to effectively guide the chips out of the cutting area, avoid secondary scratches on the machined surface by the chips, and is conducive to obtaining high-quality surface finish; the continuous semicircular contact surface can disperse heat during the cutting process, reduce thermal damage to the workpiece surface caused by high temperature, such as burns or discoloration, and help maintain the original surface quality of the material.

[0024] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

Claims

1. A high-precision hole requires mirror drilling, including: A knife handle (2), a rear blade back (4) and a cutting portion, characterized in that: a transition portion (3) is provided at one end of the knife handle (2), a cutting portion is provided at one end of the transition portion (3), the cutting portion comprises a drill tip (7), one end of the cutting portion is a drill tip (7), a rake face (5) is provided on the side wall of the cutting portion, a cutting edge (6) is provided on one side of the rake face (5), the cross section of the rear blade back (4) is semicircular, and the rake face (5) is located on the plane portion of the rear blade back (4); The drill tip (7) is a semicircular single-edged centering tip structure; one end of the cutting edge (6) is connected to the single-edged edge of the drill tip (7); the transition portion (3) is truncated cone-shaped, and the transition portion (3) is connected to the cutting portion and the shank (2) in a circular arc transition.

2. A high-precision hole requiring mirror drilling according to claim 1, characterized in that: The angle between the front cutting surface (5) and the horizontal line is 89-85 degrees.

3. A high-precision hole requiring mirror drilling according to claim 1, characterized in that: One end of the tool handle (2) is provided with a chamfer (1), and the front cutting surface (5) is used for chip removal during drilling.

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