A chip-guiding smooth deep hole drill

Abstract

This invention relates to the field of hole machining technology and discloses a deep hole drill with smooth chip removal. It includes a chip removal channel disposed inside the drill bit body. The cutting end of the drill bit body has a first chip removal groove and a second chip removal groove arranged in an equidistant annular array, which are connected to the chip removal channel. This solution utilizes the inherent characteristics of the spiral chips generated during hole machining to avoid clogging and ensure smooth chip removal. This solution divides the outer cutting tool in the deep hole drill into two modules, distributing the chip thickness that would otherwise require one outer cutting tool to cut to the two cutting tools, resulting in smoother hole machining and less tool wear. In the prior art, the chip width is similar; this solution can produce chips of a special shape, turning the disadvantage of chip entanglement into an advantage. Furthermore, it allows broken chips to be discharged to the outside with the help of the entanglement and support of unbroken chips, ensuring smooth chip removal.

Description

Technical Field

[0001] This invention relates to the field of hole machining technology, and more specifically to a deep hole drill with smooth chip guiding. Background Technology

[0002] A deep hole drill is a type of drill bit specifically designed for machining deep holes, and it is mainly divided into two categories: external chip removal and internal chip removal. The biggest disadvantage of deep hole drills is the difficulty in heat dissipation and chip removal, which requires special attention during use.

[0003] Chinese invention patent CN112453502A, entitled "An Internal Chip Removal Deep Hole Drill," discloses a drill comprising a cutting tool, a cutting body, and a wedge-shaped portion. The wedge-shaped portion has wedge-shaped protrusions distributed along its circumference, with a single-sided gap between the protrusions and the inner wall of the deep hole greater than or equal to 0 millimeters. The self-centering force of the deep hole drill can be precisely adjusted when needed. The position or orientation of the wedge-shaped protrusions can be changed by positioning components, screws, and supports, altering the thickness of the liquid film within the gap, thereby adjusting the force exerted by the liquid on the wedge-shaped profile. This invention features a high-precision tool system.

[0004] Chinese invention patent CN112743128A, entitled "A Welded BTA Deep Hole Drill," discloses a drill bit body with three chip removal channels, an outer blade, a middle blade, an inner blade, and a guide block. The outer blade is adjacent to the first chip removal channel, the middle blade is adjacent to the second chip removal channel, and the inner blade is adjacent to the third chip removal channel. The outer blade, middle blade, and inner blade on the drill bit body are staggered. The outer blade on the outer circle and the two guide blocks are nearly equally distributed. This design has the technical solution of preventing iron filings from entangled and blocking chips through the three chip removal channels.

[0005] Chinese invention patent CN102489752A, entitled "A Deep Hole Drill Bit," discloses a drill bit comprising a shank, a shank, and a cutting edge. The shank has a chip removal channel, and the cutting edge includes at least two cutting edges, each with at least one chip-dispersing groove. The chip-dispersing grooves are arranged along different circumferences centered on the shank axis, and the annular surfaces swept by each chip-dispersing groove do not overlap. This invention provides a technical solution that can divide the workpiece to be cut into multiple chips with a width smaller than the inner diameter of the chip removal channel, facilitating chip removal.

[0006] The aforementioned invention patent improves the precision and chip removal smoothness of deep hole drilling. In a welded BTA deep hole drill, the method to avoid chip clogging is to prevent the chips from entangled. However, during on-site machining, there are indeed spiral-shaped chips that entangle and compress, causing high friction with the chip removal channel wall and clogging. This prevents the cutting fluid from effectively removing the chips. The reason for the entanglement and compression of the chips is the easy compression and oscillation of spiral-shaped chips. The thinner the chips, the easier it is to cause clogging. This solution requires three chip removal channels, which increases the production cost of the deep hole drill bit itself.

[0007] In existing technologies, the outer cutting edge of a deep hole drill is designed to be wider than the inner and middle cutting edges. This allows for better centering and improves stability during hole machining. However, the large-width spiral chips produced by the outer cutting edge are heavy and not easily flushed out by the cutting fluid, which is also a major cause of blockage during hole machining. Therefore, there is an urgent need in this field for a deep hole drill with smooth chip removal to solve the technical problem that existing deep hole drills cannot achieve smooth chip removal using a simple structure. Summary of the Invention

[0008] The purpose of this invention is to provide a deep hole drill with smooth chip removal, so as to solve the technical problem that existing deep hole drills cannot achieve smooth chip removal using a simple structure.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A chip-guiding deep hole drill includes a drill bit body and a guide bar mounted on the side wall of the cutting end of the drill bit body. The drill bit also includes a chip removal channel inside the drill bit body. The cutting end of the drill bit body has a first chip removal groove and a second chip removal groove arranged in an equidistant annular array, which are connected to the chip removal channel. An inner insert and a first outer insert are fixedly mounted on the top of the side wall of the first chip removal groove, and a middle insert and a second outer insert are fixedly mounted on the top of the side wall of the second chip removal groove. The cutting edges of the first and second outer inserts are arranged in an equidistant annular array around the axis of the drill bit body, preventing eccentric vibration during hole machining. The inner insert performs inner-circle cutting, the middle insert performs middle-circle cutting, and the cutting trajectories of the first and second outer inserts overlap, jointly performing outer-circle cutting.

[0011] When machining holes, the inner insert can cut a first spiral narrow chip, the first outer insert can cut a first spiral wide chip, the middle insert can cut a second spiral narrow chip, and the second outer insert can cut a second spiral wide chip; the thickness of the first spiral narrow chip and the second spiral narrow chip are both H, and the sum of the thicknesses of the first spiral wide chip and the second spiral wide chip is H;

[0012] The height s1 of the cutting edge of the second outer insert protruding from the end face of the deep hole drill bit body is greater than or equal to the height s2 of the cutting edge of the first outer insert protruding from the end face of the deep hole drill bit body body; the height difference s3 = s1 - s2, H / 2 > s3;

[0013] The cutting edge lengths of the first outer blade and the second outer blade are both L, where L > the cutting edge length of the middle blade and L > the cutting edge length of the inner blade.

[0014] The deep hole drill is an internal chip removal type deep hole drill, with cutting fluid inside the chip removal channel, continuously flowing from the end near the first chip removal groove and the second chip removal groove to the end away from the first chip removal groove and the second chip removal groove, carrying the first spiral wide chip, the first spiral narrow chip, the second spiral wide chip, the second spiral narrow chip, and debris to the outside.

[0015] Using the above technical solution, under stable helical propulsion efficiency in hole machining, the widths of the first and second helical wide chips are greater than the widths of the first and second helical narrow chips, while the thicknesses of the first and second helical wide chips are less than the thicknesses of the first and second helical narrow chips. The first and second helical wide chips form the first chip group, entering the chip removal channel from the first chip groove, while the second helical wide chips form the second chip group, entering the chip removal channel from the second chip groove. Inevitably, the first, second, and third helical wide chips become entangled within the chip removal channel. The first and second helical wide chips have a large impact area from the cutting fluid and are lightweight, providing sufficient power for discharge from the chip removal channel. However, due to their small thickness, they are prone to deformation. The disadvantages of chip accumulation are as follows: The first and second spiral narrow chips have a small contact area with the cutting fluid, requiring a high flow rate of the cutting fluid for continuous and smooth discharge from the chip removal channel. However, due to their large thickness, they have the advantages of good self-support and are not prone to accumulation and deformation. When the first or second spiral wide chips become entangled with the first or second spiral narrow chips, they can influence each other. The first or second spiral narrow chips can utilize the sufficient force of the first or second spiral wide chips to be flushed to the outside by the cutting fluid. The first or second spiral wide chips can utilize the excellent support properties of the first or second spiral narrow chips to prevent deformation and accumulation. Adopting the above solution can reduce the risk of chip clogging and lower the standard for cutting fluid flow rate, resulting in energy savings. In the prior art, the breakage of continuous spiral chips is a common phenomenon in hole machining. The broken spiral chips are more prone to accumulation and blockage. By adopting the above technical solution, the entanglement effect between chips can be used to make the broken chips entangled and associated with the unbroken chips. The unbroken chips have a carrying effect on the broken chips to the outside and also have a supporting effect, which can effectively avoid the accumulation and blockage phenomenon.

[0016] As a preferred embodiment, the deep hole drill also includes an outer sleeve tool holder sleeved on the outer wall of the deep hole drill bit body. A cutting fluid flow jacket is provided between the inner wall of the outer sleeve tool holder and the outer wall of the deep hole drill bit body. An external cutting fluid supply system inputs cutting fluid into the cutting fluid flow jacket. The cutting fluid flows along the outer wall of the deep hole drill bit body to the first chip removal groove and the second chip removal groove area, and flows from the first chip removal groove and the second chip removal groove into the chip removal channel, washing out the first spiral wide chip, the first spiral narrow chip, the second spiral wide chip, the second spiral narrow chip, and debris from inside the chip removal channel to the outside. The basic chip removal method is existing technology and will not be described in detail here.

[0017] As a preferred embodiment, two chip removal channels are provided, with the first chip removal groove and the second chip removal groove each connected to a chip removal channel, and the first chip group and the second chip group being discharged from different chip removal channels respectively;

[0018] By adopting the above solution, the entanglement of multiple chips can be avoided, the first chip group and the second chip group can be separated, and the entanglement of the first spiral narrow chip and the second spiral narrow chip, and the first spiral wide chip and the second spiral wide chip can be avoided while having the advantages of mutual support and mutual pushing between chips, thus avoiding ineffective entanglement.

[0019] As a preferred embodiment, the outer diameter of the second spiral wide chip is larger than the outer diameter of the second spiral narrow chip, and the outer diameter of the first spiral wide chip is larger than the outer diameter of the first spiral narrow chip; the aperture of the chip removal channel is 1.3-1.5 times the outer diameter of the first spiral wide chip or the second spiral wide chip, which enables the chips to effectively obtain the driving force of the cutting fluid. Compared with the scheme with only one chip removal channel, the smaller aperture of the chip removal channel makes it easier for the chips to entangle, thereby improving the mutual support and propulsion effect between the chips.

[0020] As a preferred embodiment, the connection between the second chip removal groove and the chip removal channel is a smooth transition surface, and the connection between the first chip removal groove and the chip removal channel is a smooth transition surface, which allows the chips to smoothly enter the chip removal channel.

[0021] As a preferred option, the cutting edge length of the 3L / 4 insert is greater than L / 2, and the cutting edge length of the 3L / 4 insert is greater than L / 2, making hole machining smoother.

[0022] As the preferred option, s3=0.

[0023] The deep hole machining method uses a chip-guided deep hole drill to machine the hole in the workpiece. During the hole opening process, the main body of the deep hole drill bit moves in a helical advance with a constant pitch in the opening direction. The pitch of the helical trajectory at a point on the main body of the deep hole drill bit is S, where S=H.

[0024] The present invention has the following beneficial effects: 1. This solution can utilize the inherent characteristics of the spiral chips generated during the hole machining process to avoid clogging and ensure smooth chip removal.

[0025] 2. This solution splits the outer cutting tool in the deep hole drill into two modules, distributing the chip thickness that would otherwise require one outer cutting tool to cut to the two cutting tools, making hole machining smoother and reducing tool wear.

[0026] 3. In the existing technology, the chip width is similar. This solution can produce chips with special shapes, turning the disadvantage of chip entanglement into an advantage. It can also make broken chips escape from the outside with the help of the entanglement and support of unbroken chips, so as to make chip removal smooth.

[0027] 4. This solution is designed with a refined approach to discharge the two wide chips from two separate chip removal channels, which can avoid ineffective entanglement and ensure smooth chip removal.

[0028] 5. This solution has a simple structure. Compared with the basic deep hole drill in the existing technology, there are no major structural changes, which facilitates production. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0030] Figure 1 This is a schematic diagram of the overall structure provided in Embodiment 1 of the present invention;

[0031] Figure 2 This is a schematic diagram of the overall structure provided in Embodiment 2 of the present invention;

[0032] Figure 3 for Figure 1 Cross-sectional view of region A1 in the middle;

[0033] Figure 4 This is a top view of the overall structure provided in Embodiment 2 of the present invention;

[0034] Figure 5 for Figure 2 Cross-sectional view of region A2 in the middle;

[0035] Figure 6 This is a schematic diagram illustrating the normal entanglement and breakage of chips in this invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 101. Deep hole drill bit body; 102. Guide bar; 103. Inner cutting tool; 104. Middle cutting tool; 105. First outer cutting tool; 106. Second outer cutting tool; 107. First chip removal groove; 108. Second chip removal groove; 109. Chip removal channel; 201. Outer sleeve tool holder; 202. Cutting fluid; 301. First spiral wide chip; 302. First spiral narrow chip; 303. Second spiral wide chip; 304. Second spiral narrow chip; 305. Chips. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] like Figure 1 , 3As shown in Figure 6, the chip-guiding deep hole drill provided in Embodiment 1 of the present invention includes a deep hole drill bit body 101 and a guide strip 102 installed on the side wall of the cutting end of the deep hole drill bit body 101. The deep hole drill also includes a chip removal channel 109 disposed inside the deep hole drill bit body 101. The cutting end of the deep hole drill bit body 101 is provided with a first chip removal groove 107 and a second chip removal groove 108 in an equidistant annular array. The first chip removal groove 107 and the second chip removal groove 108 are respectively connected to the chip removal channel 109. An inner cutting tool 103 is fixedly installed on the top of the side wall of the first chip removal groove 107. A middle insert 104 and a second outer insert 106 are fixedly installed on the top of the side wall of the second chip groove 108, along with the first outer insert 105. The cutting edges of the first outer insert 105 and the second outer insert 106 are arranged in an equidistant ring array with the axis of the deep hole drill body 101 as the axis, so that the deep hole drill is less prone to eccentric vibration during hole machining. The inner insert 103 performs inner ring cutting for hole machining, the middle insert 104 performs middle ring cutting for hole machining, and the cutting trajectories of the first outer insert 105 and the second outer insert 106 coincide, jointly performing outer ring cutting for hole machining.

[0040] During hole machining, the inner insert 103 can cut a first spiral narrow chip 302, the first outer insert 105 can cut a first spiral wide chip 301, the middle insert 104 can cut a second spiral narrow chip 304, and the second outer insert 106 can cut a second spiral wide chip 303; the thickness of the first spiral narrow chip 302 and the second spiral narrow chip 304 is H, and the sum of the thicknesses of the first spiral wide chip 301 and the second spiral wide chip 303 is H;

[0041] The height s1 of the cutting edge of the second outer blade 106 protruding from the end face of the deep hole drill body 101 is greater than or equal to the height s2 of the cutting edge of the first outer blade 105 protruding from the end face of the deep hole drill body 101; the height difference s3 = s1 - s2 = 0, which makes the chip removal effect good.

[0042] The cutting edge lengths of the first outer blade 105 and the second outer blade 106 are both L, where L > the cutting edge length of the middle blade 104 and L > the cutting edge length of the inner blade 103.

[0043] The deep hole drill is an internal chip removal type deep hole drill. Cutting fluid is inside the chip removal channel 109 and continuously flows from the end near the first chip removal groove 107 and the second chip removal groove 108 to the end away from the first chip removal groove 107 and the second chip removal groove 108, carrying the first spiral wide chip 301, the first spiral narrow chip 302, the second spiral wide chip 303, the second spiral narrow chip 304, and the debris 305 to the outside.

[0044] Using the above technical solution, under stable hole machining spiral propulsion efficiency, the widths of the first spiral wide chip 301 and the second spiral wide chip 303 are greater than the widths of the first spiral narrow chip 302 and the second spiral narrow chip 304, and the thicknesses of the first spiral wide chip 301 and the second spiral wide chip 303 are less than the thicknesses of the first spiral narrow chip 302 and the second spiral narrow chip 304; the first spiral wide chip 301 and the first spiral narrow chip 302 form the first chip group, entering the chip discharge passage from the first chip discharge groove 107. In channel 109, the second spiral wide chip 303 and the second spiral narrow chip 304 form the second chip group, entering the chip removal channel 109 from the second chip removal groove 108. The first spiral wide chip 301, the first spiral narrow chip 302, the second spiral wide chip 303, and the second spiral narrow chip 304 inevitably become entangled within the chip removal channel 109. The first spiral wide chip 301 and the second spiral wide chip 303 have a large impact area from the cutting fluid and are lightweight, resulting in sufficient power for their discharge from the chip removal channel 109. However, due to their small thickness, they are prone to deformation and accumulation. The first spiral narrow chip 302 and the second spiral narrow chip 304 have small contact areas with the cutting fluid, requiring a high flow rate of the cutting fluid for continuous and smooth discharge from the chip removal channel 109. However, due to their large thickness, they have good self-support and are less prone to accumulation and deformation. When the first spiral wide chip 301 or the second spiral wide chip 303 becomes entangled with the first spiral narrow chip 302 or the second spiral narrow chip 304, they can influence each other. The first spiral narrow chip 302 or the second spiral narrow chip 304 can utilize the sufficient power of the first spiral wide chip 301 or the second spiral wide chip 303 to be flushed to the outside by the cutting fluid. The first spiral wide chip 301 or the second spiral wide chip 303 can utilize the excellent support performance of the first spiral narrow chip 302 or the second spiral narrow chip 304 to prevent deformation and accumulation. Using the above solutions can reduce the risk of chip blockage and lower the standard for cutting fluid flow rate, resulting in energy savings. In the prior art, the breakage of continuous spiral chips is a common phenomenon in hole machining. The broken spiral chips are more prone to accumulation and blockage. By adopting the above technical solution, the entanglement effect between chips can be used to make the broken chips entangled and associated with the unbroken chips. The unbroken chips have a carrying effect on the broken chips to the outside and also have a supporting effect, which can effectively avoid the accumulation and blockage phenomenon.

[0045] The deep hole drill also includes an outer sleeve tool holder 201 sleeved on the outer wall of the deep hole drill bit body 101. A cutting fluid flow jacket is provided between the inner wall of the outer sleeve tool holder 201 and the outer wall of the deep hole drill bit body 101. An external cutting fluid 202 supply system inputs cutting fluid 202 into the cutting fluid flow jacket. The cutting fluid 202 flows along the outer wall of the deep hole drill bit body 101 to the area of ​​the first chip removal groove 107 and the second chip removal groove 108, and flows from the first chip removal groove 107 and the second chip removal groove 108 into the inside of the chip removal channel 109, flushing the first spiral wide chip 301, the first spiral narrow chip 302, the second spiral wide chip 303, the second spiral narrow chip 304, and the debris 305 out from the inside of the chip removal channel 109 to the outside.

[0046] The junction between the second chip removal groove 108 and the chip removal channel 109 is a smooth transition surface, and the junction between the first chip removal groove 107 and the chip removal channel 109 is a smooth transition surface, which allows the chips to smoothly enter the chip removal channel 109.

[0047] The cutting edge length of the center insert 104 is 5L / 8, and the cutting edge length of the inner insert 103 is 5L / 8, making hole machining smoother.

[0048] The deep hole machining method uses a chip-guided deep hole drill to machine the hole in the workpiece. During the hole opening process, the main body 101 of the deep hole drill bit moves in a helical advance with equal pitch in the opening direction. The pitch of the helical trajectory at a point on the main body 101 of the deep hole drill bit is S, where S=H.

[0049] Example 2, as Figure 2 , 4 As shown in Figures 5 and 6, based on the technical solution of Embodiment 1, two chip removal channels 109 are provided. The first chip removal groove 107 and the second chip removal groove 108 are respectively connected to one chip removal channel 109, and the first chip group and the second chip group are discharged from different chip removal channels 109 respectively.

[0050] By adopting the above solution, the entanglement of multiple chips can be avoided, and the first chip group and the second chip group can be separated. While having the advantages of mutual support and mutual pushing between chips, the entanglement of the first spiral narrow chip 302 and the second spiral narrow chip 304, and the entanglement of the first spiral wide chip 301 and the second spiral wide chip 303 can be avoided, thus avoiding ineffective entanglement.

[0051] The outer diameter of the second spiral wide chip 303 is larger than the outer diameter of the second spiral narrow chip 304, and the outer diameter of the first spiral wide chip 301 is larger than the outer diameter of the first spiral narrow chip 302. The aperture of the chip removal channel 109 is 1.4 times the outer diameter of the first spiral wide chip 301 or the second spiral wide chip 303, which enables the chips to effectively obtain the driving force of the cutting fluid. Compared with the scheme with only one chip removal channel 109, the aperture of the chip removal channel 109 is smaller, making it easier for the chips to entangle and avoiding the large angle between the axis of the broken spiral chip and the axis of the chip removal channel 109, further reducing the probability of clogging and improving the mutual support and propulsion effect between the chips.

[0052] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A chip-guiding deep hole drill, comprising a deep hole drill bit body (101) and a guide strip (102) mounted on the side wall of the cutting end of the deep hole drill bit body (101), characterized in that: The deep hole drill also includes a chip removal channel (109) disposed inside the deep hole drill bit body (101). The cutting end of the deep hole drill bit body (101) is provided with a first chip removal groove (107) and a second chip removal groove (108) arranged in an equidistant annular array. The first chip removal groove (107) and the second chip removal groove (108) are respectively connected to the chip removal channel (109). An inner cutting tool (103) and a first outer cutting tool (105) are fixedly installed on the top of the side wall of the first chip removal groove (107), and the side wall of the second chip removal groove (108) is fixedly installed on the second chip removal groove (108). The top is fixedly equipped with a middle cutting edge (104) and a second outer cutting edge (106); the cutting edges of the first outer cutting edge (105) and the second outer cutting edge (106) are arranged in an equidistant ring array with the axis of the deep hole drill body (101) as the axis; the inner cutting edge (103) performs inner ring cutting for hole machining, the middle cutting edge (104) performs middle ring cutting for hole machining, and the cutting trajectories of the first outer cutting edge (105) and the second outer cutting edge (106) coincide, and together they perform outer ring cutting for hole machining; When machining holes, the inner insert (103) can cut a first spiral narrow chip (302), the first outer insert (105) can cut a first spiral wide chip (301), the middle insert (104) can cut a second spiral narrow chip (304), and the second outer insert (106) can cut a second spiral wide chip (303); the thickness of the first spiral narrow chip (302) and the second spiral narrow chip (304) is H, and the sum of the thicknesses of the first spiral wide chip (301) and the second spiral wide chip (303) is H; The height s1 of the cutting edge of the second outer blade (106) protruding from the end face of the deep hole drill body (101) is greater than or equal to the height s2 of the cutting edge of the first outer blade (105) protruding from the end face of the deep hole drill body (101); the height difference s3 = s1 - s2, H / 2 > s3; The cutting edge lengths of the first outer blade (105) and the second outer blade (106) are both L, where L > the cutting edge length of the middle blade (104) and L > the cutting edge length of the inner blade (103). The deep hole drill is an internal chip removal type deep hole drill. Cutting fluid is inside the chip removal channel (109) and continuously flows from one end near the first chip removal groove (107) and the second chip removal groove (108) to the end away from the first chip removal groove (107) and the second chip removal groove (108), carrying the first spiral wide chip (301), the first spiral narrow chip (302), the second spiral wide chip (303), the second spiral narrow chip (304), and the debris (305) to the outside. There are two chip removal channels (109). The first chip removal groove (107) and the second chip removal groove (108) are respectively connected to a chip removal channel (109). The first chip group and the second chip group are discharged from different chip removal channels (109). The first helical wide chip (301) and the first helical narrow chip (302) are intertwined, and the second helical wide chip (303) and the second helical narrow chip (304) are intertwined.

2. The chip-guiding deep hole drill according to claim 1, characterized in that: The deep hole drill also includes an outer sleeve tool bar (201) sleeved on the outer wall of the deep hole drill body (101). A cutting fluid flow jacket is provided between the inner wall of the outer sleeve tool bar (201) and the outer wall of the deep hole drill body (101). An external cutting fluid (202) supply system inputs cutting fluid (202) into the cutting fluid flow jacket. The cutting fluid (202) flows along the outer wall of the deep hole drill body (101) to the area of ​​the first chip removal groove (107) and the second chip removal groove (108), and flows from the first chip removal groove (107) and the second chip removal groove (108) into the chip removal channel (109), flushing the first spiral wide chip (301), the first spiral narrow chip (302), the second spiral wide chip (303), the second spiral narrow chip (304), and the debris (305) out from the inside of the chip removal channel (109) to the outside.

3. The chip-guiding deep hole drill according to claim 1, characterized in that: The outer diameter of the second spiral wide chip (303) is greater than the outer diameter of the second spiral narrow chip (304), and the outer diameter of the first spiral wide chip (301) is greater than the outer diameter of the first spiral narrow chip (302); the aperture of the chip discharge channel (109) is 1.3-1.5 times the outer diameter of the first spiral wide chip (301) or the outer diameter of the second spiral wide chip (303).

4. A deep hole drill with smooth chip guiding according to claim 1, characterized in that: The connection between the second chip removal groove (108) and the chip removal channel (109) is a smooth transition surface, and the connection between the first chip removal groove (107) and the chip removal channel (109) is a smooth transition surface.

5. A deep hole drill with smooth chip guiding according to claim 1, characterized in that: The cutting edge length of the middle insert (104) is greater than L / 2, and the cutting edge length of the inner insert (103) is greater than L / 2.

6. A deep hole drill with smooth chip guiding according to claim 1, characterized in that: s3=0。 7. A method for machining deep holes, characterized in that: The workpiece is machined using the chip-guiding deep hole drill as described in any one of claims 1-6; during the hole-opening process, the main body (101) of the deep hole drill bit moves in a spiral with equal pitch in the hole-opening direction, and the pitch of the spiral trajectory of a point on the main body (101) of the deep hole drill bit is S, where S=H.

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