Boring cutter

Abstract

The utility model relates to a boring cutter which comprises a cutter main body, the cutter main body is provided with a main body central axis B for limiting a forward direction DF and a backward direction DR which are opposite, and the cutter main body can rotate around the main body central axis B in a rotating direction R; the tool body comprises a cutting head, a tool rest outwards extends in the radial direction of the central axis B of the tool body, a containing part is arranged on the tool rest, the tool body further comprises a cooling channel extending in the axial direction of the central axis of the tool body, and the cooling channel comprises a cooling liquid outflow opening and a cutting seat arranged in the containing part. The cutting seat is provided with a cutting edge and a guide channel, and the outflow opening and the guide channel are jointed by a coolant joint chamber. The guide channel and the coolant joint chamber are arranged on the cutting seat, the cooling liquid can reduce the influence of the rotating trend of the cutter, and the cooling liquid can reliably and accurately cool and lubricate the cutting edge all the time after the cutting edge is finely adjusted and positioned.

Description

Technical Field

[0001] The utility model relates to a cutting tool, in particular to a light rotary tool, such as a boring tool. Background Art

[0002] Boring tools have high cutting efficiency. In order to improve the cutting accuracy of the tool during the processing, an adjustment module is usually set on the tool to fine-tune the positioning of the cutting edge by adjusting the screw to ensure the optimal processing size of the workpiece hole. For example, a Chinese invention patent with patent application number CN200510122966 (publication number CN1810424A) <shc>The article "Double-edged indexable radial fine-adjustment precision boring tool" discloses a boring tool having a micro-adjustment pin on its tool body and an outer cone at the head of the micro-adjustment pin. By adjusting two locking screws, the outer cone is slightly displaced, thereby fine-tuning the positioning of the cutting edge, and finally enabling the boring tool to cut holes of different diameters. At the same time, the boring tool can also be provided with a coolant delivery channel for cooling the cutting edge. The flow outlet of the coolant delivery channel is adjacent to the rear end of the cutting edge and is arranged on the end side of the tool body. The design of the flow outlet is relatively narrow, and the coolant can be ejected in the form of a beam. However, the boring tool still has the following usage problems during use: First, the flow outlet is located at a distance far from the cutting point, so it cannot always ensure reliable cooling of the cutting blade and / or cutting edge; second, the coolant delivery channel is formed by the differential adjustment screw sleeve, the locking screw and the through hole of the differential micro-adjustment pin. As mentioned above, when the two locking screws are adjusted to cause a micro-displacement of the outer cone, the flow direction of the coolant flow will inevitably be significantly restricted. For this reason, further limitations are required. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a boring tool in which a coolant can always reliably cool the cutting area in view of the above-mentioned existing technical status, and is particularly suitable for boring tools in which the position of the cutting edge can be adjusted.

[0004] The technical solution adopted by the utility model to solve the above technical problems is: the boring tool comprises:

[0005] a tool body having a body central axis B defining a relative forward direction DF and a rearward direction DR, and said tool body being rotatable about said body central axis B in a rotational direction R;

[0006] The tool body comprises:

[0007] A cutting head, wherein a tool holder is radially extended outwardly along the central axis B of the main body, and a receiving portion for receiving a cutting edge is provided on the tool holder;

[0008] Features:

[0009] A cooling channel extending axially along the central axis B of the main body, including an outflow port opened on the tool holder for cooling liquid to flow out to the receiving portion;

[0010] a cutting seat adjustably disposed in the receiving portion, the cutting edge being disposed on the cutting seat and provided with a guide channel for guiding coolant directly to the cutting area of ​​the cutting edge; and

[0011] A coolant engagement chamber is provided for engaging the outflow port and the guide channel, wherein the coolant engagement chamber is at least partially defined by the cutting seat.

[0012] In order to achieve the connection between the cooling channel and the guide channel, preferably, the coolant connection chamber is opened inside the cutting seat and is enclosed together with at least the wall of the tool holder. One end of the coolant connection chamber is the flow outlet at the end of the cooling channel, and the other end is the flow inlet of the guide channel leading to the cutting edge. The inner wall of the cutting seat and the outer wall of the tool holder are close together to form a chamber for the circulation of coolant.

[0013] For the convenience of processing, the coolant joint chamber is preferably a groove body opened inside the cutting seat and enclosed together with the wall of the tool holder. The coolant joint chamber is formed by the inner wall of the cutting seat radially outwardly, and the open end of the groove body is enclosed by the wall of the tool holder.

[0014] In order to ensure the spraying of the coolant while reducing the centrifugal effect of the tool body on the coolant, it is preferred that the ratio of the width b to the length h and the depth d of the groove body is 0.4:1:0.3-0.5:1:0.2. Among them, the depth of the groove body is designed to be thinner, thereby reducing the impact on the flow rate of the coolant entering the groove body from the cooling channel, ensuring that the coolant can cool the cutting area of ​​the cutting edge in a jet shape when it flows out of the outlet at the end of the guide channel; at the same time, the groove body is designed to be thinner in depth so that the coolant beam can be separated from the trend of the tool rotating at high speed, thereby forming a thin closed coolant envelope to prevent the coolant envelope from protruding.

[0015] In order to ensure that the coolant joint chamber is always joined with the outlet and inlet end points on both sides, it is preferred that the cross-sectional area of ​​the coolant joint chamber is larger than the cross-sectional area of ​​the outlet of the cooling channel and the cross-sectional area of ​​the inlet end of the guide channel. The coolant joint chamber is located inside the cutting seat. When the adjustment module positions and adjusts the cutting edge, the coolant joint chamber can be covered on the outlet of the cooling channel even after axial movement due to its large cross-sectional area, and the inlet end of the guide channel keeps moving synchronously with the coolant joint chamber. At this time, the coolant joint chamber is always joined with the outlet and inlet end points on both sides.

[0016] In order to achieve reliable cooling of the cutting edge, it is preferred that the cross-sectional area of ​​the coolant joint chamber is 300% to 500% larger than the cross-sectional area of ​​the outflow port of the cooling channel and the cross-sectional area of ​​the inlet end of the guide channel. The cross-sectional area of ​​the coolant joint chamber is larger than the positioning adjustment size of the adjustment module, so that the coolant joint chamber is always connected with the outflow port of the cooling channel, and the coolant enters the coolant joint chamber through the outflow port, and then enters the guide channel through the inlet end to reliably cool the cutting area.

[0017] In order to improve the processing accuracy, preferably, the accommodating portion is provided with an adjustment module that can be used to adjust the position of the cutting edge. The adjustment module can drive the cutting seat to move axially or radially within the accommodating portion under the drive of external force, and at least a part of the coolant engagement chamber can move with the cutting seat and always maintain engagement with the outflow port and the guide channel.

[0018] In order to achieve the axial positioning adjustment of the cutting edge, preferably, the adjustment module includes a first adjustment member, the first adjustment member is mounted on the tool holder, and the adjustment portion of the first adjustment member abuts against the top surface of the cutting seat, the top surface extends from front to back and tilts toward the tool holder, the adjustment portion of the first adjustment member is provided with an inclined surface that matches the top surface, and the inclined surface of the first adjustment member can apply a vertical component force to the top surface of the cutting seat under the drive of an external force, thereby driving at least part of the coolant joint chamber and the cutting edge to move axially. The first adjustment member is an adjustment screw, and before axial adjustment, the clamping screw needs to be loosened with the help of a wrench, and then the first adjustment member is rotated with the wrench, and then the overall axial positioning of the cutting seat can be adjusted.

[0019] In order to achieve radial adjustment of the cutting edge, preferably, the cutting seat includes a first seat body for setting the coolant joint chamber and a second seat body for setting the cutting edge, the outer side of the first seat body is provided with a vertical slot for the second seat body to be inserted and extending in the front-to-back direction, the first seat body is provided with a guide hole perpendicular to the vertical slot in the Y direction, and the adjustment module includes a second adjustment member perpendicularly arranged in the guide hole in the Y direction, and the second adjustment member can change the size of the guide hole under the drive of external force, and then drive the second seat body to move in the radial X direction. Among them, when the second adjustment member is driven by an external force to make the guide hole larger, the second seat body drives the cutting edge to move in a direction away from the first seat body; when the second adjustment member is driven by an external force to make the guide hole smaller, the second seat body drives the cutting edge to move in a direction close to the first seat body.

[0020] To facilitate radial adjustment of the cutting edge, preferably, the first seat body and the second seat body enclose the hole wall of the guide hole, and the cross-sectional changes of the first seat body and the second seat body are evenly divided into a contraction section and a straight section. Correspondingly, the cross-sectional changes of the second adjusting member are correspondingly divided into a contraction portion and a straight section according to the changes of the guide hole, and the straight portion is provided with a thread, and only the contraction section and the straight section of the first seat body are provided with a thread. When the second adjusting member is moved, it can force the second seat body to move radially relative to the first seat body by means of the sliding of its own contraction section relative to the contraction section of the second seat body. Among them, when the second adjusting member moves toward the guide hole driven by external force, the contraction part of the second adjusting member will slide from the contraction section of the second seat body to the straight section, and the guide hole tends to become larger, and the second seat body moves in the direction away from the first seat body due to the force; when the second adjusting member moves in the direction away from the guide hole driven by external force, the contraction part of the second adjusting member will slide from the straight section of the second seat body to the contraction section, and the guide hole tends to become smaller, and the second seat body drives the cutting edge to move in the direction close to the first seat body.

[0021] Compared with the prior art, the advantages of the utility model are:

[0022] 1. A guide channel for guiding the coolant directly to the cutting area of ​​the cutting edge is directly arranged on the cutting seat for setting the cutting edge, so that the coolant escaping from the guide channel can pass very closely to the cutting edge, resulting in optimal cooling and lubrication of the cutting edge, thereby greatly reducing the wear of the cutting blade, which makes the service life of the cutting edge longer and saves manufacturing costs.

[0023] 2. When the cutting edge is in the positioning and adjustment state, the coolant engagement chamber is designed to reduce the tendency of the coolant to separate from the rotating tool. At the same time, the coolant outflow outlet arranged in the center of the main body and the guide channel leading to the cutting area can be engaged to achieve precise cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the utility model;

[0025] Figure 2 A top view of an embodiment of the utility model;

[0026] Figure 3 A longitudinal cross-sectional view of an embodiment of the utility model;

[0027] Figure 4 Another longitudinal cross-sectional view of an embodiment of the utility model;

[0028] Figure 5 This is a three-dimensional exploded schematic diagram of an embodiment of the utility model;

[0029] Figure 6 It is a schematic diagram of the three-dimensional structure of the cutting seat and the cutting edge in the embodiment of the utility model;

[0030] Figure 7 It is a schematic diagram of the action changes of the cutting seat and the cutting edge in the embodiment of the utility model;

[0031] Figure 8 This is an exploded schematic diagram of a cutting seat and a cutting edge in an embodiment of the utility model;

[0032] Fig. 9 This is a schematic diagram of the cutting seat state before the first adjusting member is adjusted in the embodiment of the utility model;

[0033] Fig.10 This is a schematic diagram of the cutting seat state after the first adjusting member is adjusted in the embodiment of the utility model;

[0034] Fig.11 This is a schematic diagram of the cutting seat state before the second adjusting member is adjusted in the embodiment of the utility model;

[0035] Fig.12 This is a schematic diagram of the cutting seat state after the second adjusting member is adjusted in the embodiment of the utility model;

[0036] Fig.13 It is a longitudinal cross-sectional view of the cutting seat in the embodiment of the utility model.

[0037] In the figure: 1. tool body; 2. cutting head; 3. tool holder; 31. accommodating portion; 4. cutting edge; 5. cooling channel; 6. cutting seat; 61. first seat body; 62. second seat body; 63. vertical slot; 7. guide channel; 8. coolant coupling chamber; 9. outflow port; 10. adjustment module; 101. first adjustment member; 1011. adjustment portion; 1012. inclined surface; 102. second adjustment member; 1021. contraction portion; 1022. straight portion; 11. guide hole; 111. contraction section; 112. straight section. DETAILED DESCRIPTION

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] like Figures 1 to 13 The figure shows the best embodiment of the utility model. The boring tool comprises a tool body 1, which has a main body central axis B defining a relative forward direction DF and a rearward direction DR, and the tool body 1 can rotate around the main body central axis B in a rotation direction R; the tool body 1 comprises a cutting head 2, the cutting head 2 has a tool holder 3 extending radially outward along the main body central axis B, the tool holder 3 is provided with a receiving portion 31 for receiving a cutting edge 4, the tool body 1 also comprises a cooling channel 5 extending axially along the main body central axis B, the cooling channel 5 comprises an outflow port 9 provided on the tool holder 3 for coolant to flow out to the receiving portion 31 and a cutting seat 6 provided in the receiving portion 31, the cutting edge 4 can be adjustedly provided on the cutting seat 6, and the cutting seat 6 is provided with a guide channel 7 for coolant to be directly guided to the cutting area of ​​the cutting edge 4; the outflow port 9 and the guide channel 7 are connected by a coolant connection chamber 8, wherein the coolant connection chamber 8 is at least partially defined by the cutting seat 6.

[0040] refer to Figure 4 and Figure 6 The coolant engaging chamber 8 is provided inside the cutting seat 6 and is at least enclosed together with the wall of the tool holder 3. One end of the coolant engaging chamber 8 is the outflow port 9 at the end of the cooling channel 5, and the other end is the inlet end of the guide channel 7 leading to the cutting edge 4. The inner wall of the cutting seat 6 and the outer wall of the tool holder 3 are fitted together to form a chamber for the circulation of the coolant. In order to facilitate processing, the coolant engaging chamber 8 is a groove body provided inside the cutting seat 6. The coolant engaging chamber 8 is formed by the inner wall of the cutting seat 6 radially outwardly. The open end of the groove body is enclosed by the wall of the tool holder 3, thereby forming a chamber for engaging the outflow port 9 of the cooling channel 5 and the inlet end of the guide channel 7.

[0041] refer to Figure 4 and Figure 6 , the ratio of the width b to the length h and the depth d of the groove body is 0.4:1:0.3 to 0.5:1:0.2. Among them, the width b, length h and depth d of the groove body need to consider multiple factors during the processing. On the one hand, the design dimensions of the width b and length h need to ensure the bonding effect of the coolant bonding chamber 8, and on the other hand, the dimension of the depth d needs to consider the processing and the influence on the coolant. In this embodiment, the ratio of the width b to the length h and the depth d of the groove body is preferably 0.5:1:0.2. The depth of the groove body is designed to be thinner, so as to reduce the influence on the flow rate of the coolant entering the groove body from the cooling channel 5, and ensure that the coolant can cool the cutting area of ​​the cutting edge 4 in a jet shape when it flows out of the outlet at the end of the guide channel 7; at the same time, the thin depth of the groove body can make the coolant jet deviate from the trend of the tool rotating at high speed, thereby forming a thin closed coolant blanket to prevent the coolant blanket from protruding.

[0042] refer to Figure 2 and Figure 4 , the cross-sectional area of ​​the coolant joint chamber 8 is larger than the cross-sectional area of ​​the outflow port 9 of the cooling channel 5 and the cross-sectional area of ​​the inlet end of the guide channel 7. The coolant joint chamber 8 is arranged inside the cutting seat 6. When the adjustment module 10 positions and adjusts the cutting edge 4, the cutting seat 6 will move axially or radially in the accommodating portion 31. Since the cross-sectional area of ​​the coolant joint chamber 8 is large, even if part of it moves, it can still ensure that the outflow port 9 of the cooling channel 5 is within the coolant joint chamber 8 space formed by the inner wall of the groove body and the tool holder 3, and the inlet end of the guide channel 7 keeps moving synchronously with the coolant joint chamber 8. At this time, the coolant joint chamber 8 always keeps the joint with the outflow port 9 and the inlet end on both sides.

[0043] refer to Figure 4 and Figure 6 , the cross-sectional area of ​​the coolant joint chamber 8 is 300% to 500% larger than the cross-sectional area of ​​the outlet 9 of the cooling channel 5 and the cross-sectional area of ​​the inlet end of the guide channel 7. Among them, the cross-sectional area of ​​the coolant joint chamber 8 is larger than the positioning adjustment size of the adjustment module 10, so that the coolant joint chamber 8 can always be connected with the outlet 9 of the cooling channel 5. The coolant enters the coolant joint chamber 8 after passing through the outlet 9 of the cooling channel 5, and then enters the guide channel 7 through the inlet end. The coolant finally flows out from the outlet close to the cutting area of ​​the cutting edge 4, and reliably cools and lubricates the cutting edge 4, thereby reducing the wear of the cutting edge 4 and increasing the life of the tool. When selecting the cross-sectional area of ​​the coolant joint chamber 8, factors such as the joint effect and processing need to be considered. In order to facilitate processing, in this embodiment, on the basis of ensuring the joint effect, it is preferred that the cross-sectional area of ​​the coolant joint chamber 8 is 300% larger than the cross-sectional area of ​​the outlet 9 of the cooling channel 5 and the cross-sectional area of ​​the inlet end of the guide channel 7.

[0044] refer to Figures 5 to 8 An adjustment module 10 for adjusting the position of the cutting edge 4 is provided on the accommodating portion 31. The adjustment module 10 can drive the cutting seat 6 to move axially or radially in the accommodating portion 31 under the drive of external force. At least part of the coolant engaging chamber 8 can move with the cutting seat 6 and always maintain engagement with the outflow port 9 and the guide channel 7.

[0045] The adjustment module 10 includes a first adjustment member 101, which is mounted on the tool holder 3, and an adjustment portion 1011 of the first adjustment member 101 abuts against the top surface of the cutting seat 6, the top surface extends from front to rear and is inclined toward the tool holder 3, and the adjustment portion 1011 of the first adjustment member 101 is provided with an inclined surface 1012 that cooperates with the top surface. When driven by an external force, the inclined surface 1012 of the first adjustment member 101 can apply a vertical component force to the top surface of the cutting seat 6, thereby driving at least part of the coolant coupling chamber 8 and the cutting edge 4 to move axially. Among them, the first adjusting member 101 can be designed in various forms, for example, a slider and a slide rail are used to cooperate in the adjustment. In order to ensure the stability of the tool body 1 under high-speed rotation, the first adjusting member 101 preferably in this embodiment is an adjusting screw. The first adjusting member 101 can rotate around the axis A0, wherein its rotation direction D0 includes a first direction D01 counterclockwise and a second direction D02 clockwise. Rotating the first adjusting member 101 along the rotation direction D0 can realize the movement of the cutting seat 6 in the Y direction, wherein the Y direction includes the positive direction of the Y axis and the negative direction of the Y axis. Before the axial positioning adjustment, it is necessary to loosen the clamping screw with the help of a wrench, and then use the wrench to rotate the first adjusting member 101. Fig. 9 FIG. 1 shows the initial state of the front cutting seat 6 adjusted by the first adjusting member 101. When the first adjusting member 101 rotates along the second direction D02, the top inclined surface of the cutting seat 6 is subjected to the vertical downward force of the inclined surface 1012 of the adjusting portion 1011, thereby driving at least part of the coolant joint chamber 8 and the cutting edge 4 to move along the negative direction of the Y axis (e.g., Fig.10 When the first adjusting member 101 rotates in the first direction D01, a certain height is reserved above the top inclined surface of the cutting seat 6, and then at least part of the coolant joint chamber 8 and the cutting edge 4 can move in the positive direction of the Y axis (as shown in FIG. Fig. 9 As shown), the adjustment distance of the first adjustment member 101 is L1, and the corresponding adjustment distance of the cutting seat 6 as a whole in the Y direction is L2. After the adjustment is completed, the clamping screw needs to be tightened with the help of a wrench to complete the fixation.

[0046] The cutting seat 6 includes a first seat body 61 for setting a coolant coupling chamber 8 and a second seat body 62 for setting a cutting edge 4. A vertical slot 63 is provided on the outer side of the first seat body 61 for the second seat body 62 to be inserted and extends along the front-to-back direction. A guide hole 11 is provided on the first seat body 61 and is perpendicular to the vertical slot 63 in the Y direction. The first seat body 61 and the second seat body 62 are combined to form a hole wall of the guide hole 11. The adjustment module 10 includes a second adjustment member 102 which is perpendicularly arranged in the guide hole 11 in the Y direction. The second adjustment member 102 can change the size of the guide hole 11 under the drive of an external force, thereby driving the second seat body 62 to move along the radial X direction. The second adjusting member 102 can be set in various forms, for example, the slider and the slide rail are also used for adjustment. In this embodiment, the preferred second adjusting member 102 is an adjusting screw, which cooperates with the corresponding guide hole 11. The cross-sectional changes of the first seat body 61 and the second seat body 62 are evenly divided into a contraction section 111 and a straight section 112. Correspondingly, the cross-sectional changes of the second adjusting member 102 are divided into a contraction section 1021 and a straight section 1022 according to the changes of the guide hole 11. The straight section 1022 is provided with threads, and threads are only provided on the contraction section 111 and the straight section 112 of the first seat body 61. When the second adjusting member 102 is moving, it can slide relative to the contraction section 111 of the second seat body 62 by its own contraction section 1021, thereby forcing the second seat body 62 to move relative to the first seat body 61 in the X direction. Fig.11 The figure shows the initial state of the second adjusting member 102 before adjustment. The second adjusting member 102 can rotate around the axis A1, wherein the rotation direction D1 includes a third direction D11 in the counterclockwise direction and a fourth direction D12 in the clockwise direction. By rotating the second adjusting member 102 along the rotation direction D1, the second seat body 62 can be moved relative to the first seat body 61 along the X direction, wherein the X direction includes the positive direction of the X axis and the negative direction of the X axis. The second adjusting member 102 is rotated by a wrench. When the second adjusting member 102 rotates along the fourth direction D12, the contraction portion 1021 of the second adjusting member 102 will slide from the contraction section 111 of the hole wall to the straight section 112, thereby increasing the aperture of the guide hole 11. At this time, the second seat body 62 moves relative to the first seat body 61 along the positive direction of the X axis (as shown in FIG. Fig.12 When the second adjusting member 102 rotates along the third direction D11, the contraction portion 1021 of the second adjusting member 102 tends to escape from the contraction section 111 of the wall of the guide hole 11. At this time, the aperture of the guide hole 11 gradually decreases, and the second seat body 62 moves relative to the first seat body 61 along the negative direction of the X axis (as shown in FIG. Fig.11 As shown), the adjustment distance of the second adjustment member 102 is L3, and the movement distance of the second base body 62 relative to the first base body 61 is L4.

[0047] The specific working process is as follows: the boring tool maintains high-speed rotation during the processing of the workpiece, and a large amount of heat will be generated between the cutting area of ​​the cutting edge 4 and the workpiece. At this time, coolant needs to be supplied to the cooling channel 5 from one end of the tool body 1. The coolant flows out from the outflow port 9 at the end after passing through the cooling channel 5. The coolant after flowing out enters the coolant coupling chamber 8 and enters the guide channel 7 through the inlet end. The guide channel 7 guides the coolant to a position close to the cutting edge 4 so that the cutting edge 4 can achieve optimal cooling and lubrication, thereby extending the service life of the tool. For workpieces with higher machining accuracy, it is usually necessary to fine-tune the axial or radial positioning of the cutting edge 4 of the boring tool during machining. After loosening the clamping screw, the first adjusting member 101 is rotated with the help of a wrench. Rotating the first adjusting member 101 along the first direction D01 or the second direction D02 can respectively enable the cutting seat 6 to move a distance L2 along the positive direction of the Y axis or the negative direction of the Y axis as a whole. Rotating the second adjusting member 102 along the third direction D11 or the fourth direction D22 can enable the second seat body 62 to move a distance L4 along the positive direction of the X axis or the negative direction of the X axis relative to the first seat body 61. After adjustment according to machining requirements, the clamping screw needs to be tightened with a wrench to complete the fixation. Since the cross-sectional area of ​​the coolant coupling chamber 8 is larger than the cross-sectional area of ​​the outflow port 9 of the cooling channel 5 and the inlet end of the guide channel 7, the coolant coupling chamber 8 is always engaged with the outflow port 9 and the inlet end on both sides thereof during the positioning and adjustment of the cutting edge 4. The coolant can always be accurately guided to the vicinity of the cutting area to participate in cooling and lubrication, thereby ensuring the service life of the tool.< / shc>

Claims

1. A boring tool comprising: A tool body (1) having a body central axis (B) defining a relative forward direction (DF) and a rearward direction (DR), and the tool body (1) is rotatable about the body central axis (B) in a rotational direction (R); The tool body (1) comprises: A cutting head (2), wherein a tool holder (3) is radially extended outwardly from the central axis (B) of the main body, and a receiving portion (31) for receiving a cutting edge (4) is provided on the tool holder (3); Features: A cooling channel (5) extending axially along the central axis (B) of the main body, comprising an outlet (9) provided on the tool holder (3) for cooling liquid to flow out to the receiving portion (31); A cutting seat (6) is adjustably arranged in the receiving portion (31), the cutting edge (4) is arranged on the cutting seat (6), and a guide channel (7) is provided for guiding the cooling liquid directly to the cutting area of ​​the cutting edge (4); and A coolant engaging chamber (8) is provided for engaging the outflow opening (9) and the guide channel (7), wherein the coolant engaging chamber (8) is at least partially defined by the cutting seat (6).

2. The boring tool according to claim 1, characterized in that: The coolant connection chamber (8) is opened inside the cutting seat (6) and is at least formed together with the wall portion of the tool holder (3).

3. The boring tool according to claim 2, characterized in that: The coolant joint chamber (8) is a groove body opened inside the cutting seat (6) and is formed together with the wall of the tool holder (3).

4. The boring tool according to claim 3, characterized in that: The ratio of the width b to the length h and the depth d of the groove body is 0.4:1:0.3 to 0.5:1:0.

2.

5. The boring tool according to any one of claims 1 to 4, characterized in that: The cross-sectional area of ​​the coolant joint chamber (8) is larger than the cross-sectional area of ​​the outflow port (9) of the cooling channel (5) and the cross-sectional area of ​​the inlet end of the guide channel (7).

6. The boring tool according to claim 5, characterized in that: The cross-sectional area of ​​the coolant joint chamber (8) is 300% to 500% larger than the cross-sectional area of ​​the outlet (9) of the cooling channel (5) and the cross-sectional area of ​​the inlet end of the guide channel (7).

7. The boring tool according to any one of claims 1 to 4, characterized in that: The accommodating portion (31) is provided with an adjusting module (10) capable of adjusting the position of the cutting edge (4); the adjusting module (10) can drive the cutting seat (6) to move axially or radially within the accommodating portion (31) under the drive of an external force; at least a portion of the coolant engaging chamber (8) can move along with the cutting seat (6) and always maintain engagement with the outflow port (9) and the guide channel (7).

8. The boring tool according to claim 7, characterized in that: The adjustment module (10) comprises a first adjustment member (101), the first adjustment member (101) is mounted on the tool holder (3), and an adjustment portion (1011) of the first adjustment member (101) abuts against a top surface of the cutting seat (6), the top surface extends from front to rear and is inclined toward the tool holder (3), the adjustment portion (1011) of the first adjustment member (101) is provided with an inclined surface (1012) matched with the top surface, and the inclined surface (1012) of the first adjustment member (101) can apply a vertical component force to the top surface of the cutting seat (6) under the drive of an external force, thereby driving at least a portion of the coolant joint chamber (8) and the cutting edge (4) to move axially.

9. The boring tool according to claim 7, characterized in that: The cutting seat (6) includes a first seat body (61) for setting the coolant joint chamber (8) and a second seat body (62) for setting the cutting edge (4). The outer side of the first seat body (61) is provided with a vertical slot (63) for the second seat body (62) to be inserted and extending in the front-to-back direction. The first seat body (61) is provided with a guide hole (11) which is perpendicular to the vertical slot (63) in the Y direction. The adjustment module (10) includes a second adjustment member (102) which is perpendicular to the Y direction and is arranged in the guide hole (11). The second adjustment member (102) can change the size of the guide hole (11) under the drive of an external force, thereby driving the second seat body (62) to move in the radial X direction.

10. The boring tool according to claim 9, characterized in that: The first seat body (61) and the second seat body (62) are combined to form the hole wall of the guide hole (11); the cross-sectional changes of the first seat body (61) and the second seat body (62) are evenly divided into a contraction section (111) and a straight section (112); correspondingly, the cross-sectional changes of the second adjusting member (102) are correspondingly divided into a contraction portion (1021) and a straight section (1022) according to the changes of the guide hole (11); the straight section (1022) is provided with threads, and threads are only provided on the contraction section (111) and the straight section (112) of the first seat body (61); when the second adjusting member (102) is in a moving state, the contraction section (1021) thereof can slide relative to the contraction section (111) of the second seat body (62), thereby forcing the second seat body (62) to move radially relative to the first seat body (61).

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