A gapless resettable turning tool

Abstract

The application provides a gapless resettable turning tool, and relates to the technical field of turning tools. The turning tool comprises a tool shank body, an indexable insert arranged in an insert mounting position and forming a filling gap with the tool shank body, a pressing assembly arranged at the front end of the tool shank body and pressed on the indexable insert, two positioning reset units arranged on opposite sides of the indexable insert, a filling assembly for filling the filling gap with a curing agent, a pressure detection piece arranged on the force transmission path of the positioning reset unit, and a control assembly electrically connected with the pressure detection piece, the pushing piece of the filling assembly and the positioning reset unit. The gap is reserved and filled with the curing agent, so that a brand-new and completely fitted contact interface can be formed after each indexing, and the integrity of the original positioning surface is not relied on, thereby effectively solving the problem of poor repeated positioning accuracy of the indexable turning tool.

Description

Technical Field

[0001] This invention relates to the field of lathe tool technology, and more specifically, to a backlash-free, resettable lathe tool. Background Technology

[0002] In metal cutting, indexable inserts are typically mounted in a locating groove at the front end of the tool holder and secured by bolts, glands, or clamping blocks. Existing clamping methods primarily rely on the contact between the tool holder's locating surface and the insert's locating reference surface to ensure stable tool tip position. However, due to machining tolerances, surface roughness, wear of the locating surface, and clamping errors, minute gaps can easily form between the tool holder and the insert, causing their ideal surface contact to degenerate into localized point or line contact.

[0003] Under cutting loads, the aforementioned clearances reduce the dynamic stiffness of the tool system and cause slight displacement or high-frequency chatter in the insert, thereby affecting the surface finish, tool tip repeatability, and insert life. Especially for indexable inserts, when indexing after a cutting edge has worn or chipped, the previously stressed or worn locating surface may re-engage in positioning, resulting in a reduced actual contact area and increased locating clearance after indexing, which in turn exacerbates vibration and dimensional fluctuations.

[0004] Existing technologies typically improve clamping conditions by increasing the machining accuracy of the positioning surface, increasing the clamping force, or manually adding shims. However, high-precision machining is costly, increasing the clamping force is difficult to eliminate gaps in non-contact areas and may cause deformation of the tool holder or insert. Manual shim adjustment is inefficient and cannot adapt to gap changes after indexing. Therefore, it is necessary to provide a turning tool structure that can form a stable support interface between the tool holder and the indexed insert, and can perform online reset and gap repair after insert misalignment. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a backlash-free resettable cutting tool to solve the above problems.

[0006] The present invention adopts the following solution:

[0007] This application provides a backlash-free resettable turning tool, comprising: The handle body has a blade mounting position at its front end, and gap forming surfaces are respectively provided on both sides of the blade mounting position; An indexing insert is disposed within the insert mounting position. The opposite sides of the indexing insert are respectively spaced apart from the corresponding gaps, and a filling gap is formed between the indexing insert and the tool holder body. A clamping assembly is located at the front end of the tool holder body and is clamped onto the indexing insert; The positioning and resetting assembly includes two positioning and resetting units respectively disposed on opposite sides of the indexing blade. Each positioning and resetting unit includes a sliding sleeve, an elastic element abutting the bottom end of the sliding sleeve, and a ball head disposed inside the sliding sleeve. The ball head has a spherical contact end abutting the side of the indexing blade. A filling assembly is used to fill the filling gap with a curing agent so that the filling gap forms a cured filling layer that adheres to the tool holder body and the indexing blade; the filling assembly includes a first storage component, a second storage component, a first pusher, a second pusher, a first discharge channel and a second discharge channel disposed on the tool holder body, the first discharge channel communicating with the first storage component, the second discharge channel communicating with the second storage component, and the outlets of the first discharge channel and the second discharge channel both facing the filling gap; the first pusher and the second pusher act on the first storage component and the second storage component, respectively; A pressure detection element is disposed at the bottom end of the elastic element or between the elastic element and the sliding sleeve; The control assembly is electrically connected to the pressure detection element, the pusher of the filling assembly, and the positioning and reset unit, respectively.

[0008] Furthermore, the tool holder body includes a shank and a mounting head disposed at the front end of the shank; the blade mounting position is disposed on the mounting head; the mounting head is provided with a fixing hole, which corresponds to the center mounting hole of the indexing blade; the mounting head is also provided with a wiring cavity, and at least a portion of the control assembly is disposed within the wiring cavity.

[0009] Furthermore, the clamping assembly includes a pressure cap, a pressure block pin, and a fixing bolt; the pressure cap is fixed to the front end of the tool holder body and covers at least a portion of the structure of the control assembly; one end of the pressure block pin is disposed on the pressure cap, and the other end abuts against the indexing blade; the fixing bolt passes through the central mounting hole of the indexing blade and is connected to the tool holder body.

[0010] Furthermore, both the first discharge channel and the second discharge channel are through holes disposed within the tool holder body; the through hole includes a short side hole section near the side of the indexing blade and a long side hole section away from the side of the indexing blade; the depth of the short side hole section along the axial direction of the discharge channel is 5-8 mm; the depth of the long side hole section along the axial direction of the discharge channel is 15-18 mm.

[0011] Furthermore, the filling gap is located on opposite sides of the indexing blade; the width of the filling gap on one side is 2-4mm; the height of the filling gap is not less than 4.5mm; and the length of the filling gap is 14-20mm.

[0012] Furthermore, each of the positioning and resetting units further includes an electric push rod and a limiting slider; the ball head has the spherical contact end; the ball head is movably connected to the sliding sleeve and driven by the electric push rod; the sliding sleeve is slidably connected to the tool holder body; the limiting slider is disposed on the side of the sliding sleeve and slides in cooperation with the limiting groove on the tool holder body; one end of the elastic member abuts against the sliding sleeve, and the other end abuts against the pressure detection member.

[0013] Furthermore, the sliding stroke of the ball joint is no more than 35% of the cutting edge length of the indexing insert.

[0014] Furthermore, the indexing blade is a triangular blade or a quadrilateral blade; the shape of the blade mounting position corresponds to the shape of the indexing blade.

[0015] By adopting the above technical solution, the present invention can achieve the following technical effects: This application provides a backlash-free resettable turning tool. By reserving a gap and filling it with a curing agent, a completely new and perfectly fitting contact interface can be formed after each indexing, without relying on the integrity of the original positioning surface, thereby effectively solving the problem of poor repeatability of indexing turning tools. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a backlash-free resettable lathe tool structure according to an embodiment of the present invention.

[0018] Figure 2 This is a top view schematic diagram of a backlash-free resettable lathe tool according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of a backlash-free resettable lathe tool without a pressure cap according to an embodiment of the present invention.

[0020] Figure 4 yes Figure 3 An enlarged structural diagram of the head assembly.

[0021] Figure 5 This is a three-dimensional cross-sectional view of the discharge channel of a backlash-free resettable cutting tool according to an embodiment of the present invention.

[0022] Icons: 1. Tool holder body, 2. Indexing blade, 3. Filling gap, 4. Mounting head, 5. Fixing bolt, 6. Control assembly, 7. Pressure cap, 8. Pressure block nail, 9. First storage component, 10. Second storage component, 11. First discharge channel, 12. Second discharge channel, 13. First short side hole section, 14. Second long side hole section, 15. Ball head component, 16. Sliding sleeve, 17. Elastic component, 18. Limiting slider, 19. Pressure detection component, 20. Second short side hole section, 21. Second long side hole section. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example Combination Figures 1 to 5 As shown, this embodiment provides a backlash-free resettable turning tool, including a tool holder body 1, an indexing insert 2, a clamping assembly, a positioning and reset assembly, a filling assembly, a cured filling layer, a pressure detection element 19, and a control assembly 6.

[0025] The tool holder body 1 serves as the basic support structure for the cutting tool, and its front end is provided with a cutting tool mounting position. The cutting tool mounting position is used to mount the indexable cutting tool 2. Clearance forming surfaces are formed on opposite sides of the cutting tool mounting position, and the two clearance forming surfaces are respectively set to correspond to the opposite side surfaces of the indexable cutting tool 2.

[0026] After the indexing insert 2 is placed in the insert mounting position, the opposite sides of the indexing insert 2 do not directly contact the corresponding gap forming surface, but maintain a gap, thereby forming a filling gap 3 between the indexing insert 2 and the tool holder body 1. The filling gap 3 is used to accommodate the curing agent output from the filling assembly. After the curing agent cures, it forms a cured filling layer, which is respectively attached to the tool holder body 1 and the indexing insert 2, constituting the lateral support interface of the indexing insert 2.

[0027] In this specific embodiment, the tool holder body 1 includes a shank and a mounting head 4. The shank is used to mate with a machine tool tool post or tool holder, and the mounting head 4 is located at the front end of the shank, with the insert mounting position located on the mounting head 4. The mounting head 4 has a fixing hole, the position of which corresponds to the center mounting hole of the indexable insert 2. A fixing bolt 5 passes through the center mounting hole of the indexable insert 2 and connects to the fixing hole, thereby fixing the indexable insert 2 to the mounting head 4.

[0028] The mounting head 4 is also provided with a wiring cavity. At least a portion of the structure of the control assembly 6 is disposed within the wiring cavity. The wiring cavity provides space for the control assembly 6, electrical connection lines, and related interfaces, allowing the circuit structure to be integrated inside the tool holder body 1 or near the front end of the tool holder body 1, reducing the impact of exposed wiring on the machining environment.

[0029] The clamping assembly is located at the front end of the tool holder body 1. The clamping assembly includes a clamping cap 7, a clamping pin 8, and a retaining bolt 5. The clamping cap 7 is fixed to the front end of the tool holder body 1, covering at least a portion of the control assembly 6 and restricting the area above the indexing insert 2. The clamping pin 8 is mounted on the clamping cap 7 and abuts against the indexing insert 2. The retaining bolt 5 passes through the central mounting hole of the indexing insert 2 and connects to the tool holder body 1, serving as the primary fixing component. The clamping cap 7, clamping pin 8, and retaining bolt 5 together restrict the position of the indexing insert 2 in the insert mounting position.

[0030] The filling assembly includes a first storage unit 9, a second storage unit 10, a first pusher, a second pusher, a first discharge channel 11, and a second discharge channel 12. The first storage unit 9 is used to contain a first component curing agent, and the second storage unit 10 is used to contain a second component curing agent. The first pusher is sealed to the first storage unit 9, and the second pusher is sealed to the second storage unit 10. The first discharge channel 11 communicates with the first storage unit 9, and the second discharge channel 12 communicates with the second storage unit 10. The outlets of both the first discharge channel 11 and the second discharge channel 12 are oriented towards the filling gap 3.

[0031] In this specific embodiment, the first storage component 9 is a first material box, and the second storage component 10 is a second material box. Both the first and second pushers are electrically powered. The first pusher pushes the first component curing agent in the first material box to the first discharge channel 11, and the second pusher pushes the second component curing agent in the second material box to the second discharge channel 12. The first and second pushers are independently configured, thereby allowing for separate control of the amount of the first and second component curing agents pushed.

[0032] like Figure 5As shown, both the first discharge channel 11 and the second discharge channel 12 are through holes located within the tool holder body 1. The first discharge channel 11 includes a first short side hole section 13 near the side of the indexing blade 2 and a first long side hole section 14 away from the side of the indexing blade 2; the second discharge channel 12 includes a second short side hole section 20 near the side of the indexing blade 2 and a second long side hole section 21 away from the side of the indexing blade 2; the depth of the short side hole section is 5-8 mm, and the depth of the long side hole section is 15-18 mm. This depth setting ensures that the drilling length is within a reasonable processing range, facilitating drilling. The first discharge channel 11 and the second discharge channel 12 respectively deliver the two components of the curing agent to the filling gap 3, allowing the two components to mix and cure within the filling gap 3.

[0033] Both the first and second material boxes have capacity and stroke scales on their outer sides. The capacity scale is used to observe the remaining amount of hardener in the first and second material boxes, while the stroke scale is used to observe the pushing stroke of the first and second pushers. The capacity and stroke scales allow for monitoring the amount of hardener pushed during installation, maintenance, and replenishment.

[0034] When the curing agent is in liquid state, it flows and fills all the micro-irregular gaps. After curing, it forms a contoured surface contact that is completely consistent with the contact surface, so that the contact between the tool holder and the indexing insert 2 changes from "point contact" to complete "surface contact", which greatly improves the contact stiffness and vibration resistance.

[0035] The curing effect depends on the curing agent. A non-stick, heat-resistant mixed curing agent is preferred, such as a curing epoxy AB adhesive or epoxy resin. It should be noted that the indexing insert 2 can be made of cemented carbide, CBN (cubic boron nitride) inserts, or other commonly used insert materials. For most machining operations, wet cutting is used, meaning that cutting fluid continuously flushes the indexing insert 2 throughout the cutting process. The insert will not generate excessively high temperatures, preventing the curing agent from exceeding its withstand temperature. However, in dry cutting, actual cutting force and heat experiments have shown that: typically, the tool tip generates high temperatures instantaneously, which are then conducted to both sides of the cutting edge's machining area. Most of the heat is then carried away by the chips and workpiece; and since the curing agent is located on both sides of the cutting edge, the actual temperature of the curing agent usually does not exceed its withstand temperature.

[0036] In this specific embodiment, the filling gap 3 is located on opposite sides of the indexing insert 2. The filling gap 3 has a width of 2-4 mm, a height of 4.5 mm, and a length of 16 mm. The filling capacity of the cured filling layer provided in the filling gap 3 on one side is 0.15 ml to 0.29 ml. These dimensions allow the curing agent to enter the lateral gap between the indexing insert 2 and the tool holder body 1, and form a stable support after curing.

[0037] This size range ensures that the first and second component curing agents flow smoothly and fill the side area of ​​the indexing blade 2, while avoiding excessively narrow filling gaps 3 that could lead to increased flow resistance of the curing agent, insufficient local filling, or the formation of unfilled voids.

[0038] The 2-4mm wide filling gap 3 provides the necessary conformal filling thickness for the curing agent, enabling the cured filling layer to compensate for machining errors, surface roughness errors, and gap changes caused by wear of the positioning surface after indexing between the tool holder body 1 and the indexing insert 2 after curing. If the filling gap 3 is too small, the cured filling layer thickness will be insufficient, making it difficult to form a continuous support interface; if the filling gap 3 is too large, the amount of curing agent will increase, curing shrinkage and curing waiting time will increase accordingly, and it may reduce the geometric constraint stability of the indexing insert 2 within the tool holder body 1.

[0039] The 4.5mm high and 16mm long filling area can cover the main support area of ​​the indexing insert 2 under lateral force, so that the cured filling layer forms a planar support with a certain height and length along the side of the indexing insert 2, rather than forming support only at local points. As a result, under the action of cutting load, the lateral force on the indexing insert 2 can be dispersed and transmitted to the tool holder body 1 through the cured filling layer, reducing local stress concentration, suppressing the slight oscillation of the indexing insert 2 around the fixing bolt 5, thereby improving the contact stiffness, vibration resistance, and repeatability accuracy after clamping.

[0040] The one-sided filling space formed according to the above width, height and length has a volume of approximately 0.144 ml to 0.288 ml, which matches the one-sided filling capacity of 0.15 ml to 0.29 ml.

[0041] By proactively reserving a small, controllable gap, which is not considered a defect but rather serves as a functional space for subsequent filling of the curing agent, plastic deformation caused by over-positioning and excessive clamping force is avoided, and a uniform filling thickness is provided for the curing agent.

[0042] The positioning and reset assembly includes two positioning and reset units. The two units are respectively located on opposite sides of the indexing blade 2, corresponding to the two positioning edges of the indexing blade 2. Each positioning and reset unit includes a ball joint 15, an electric push rod, a sliding sleeve 16, an elastic element 17, and a limiting slider 18. The ball joint 15 has a spherical contact end that abuts against the side of the indexing blade 2. The ball joint 15 is rotatably connected within the sliding sleeve 16 and driven by the electric push rod; the sliding sleeve 16 is slidably connected to the tool holder body 1. The limiting slider 18 is located on the side of the sliding sleeve 16 and slides in cooperation with a limiting groove on the tool holder body 1. One end of the elastic element 17 abuts against the sliding sleeve 16, and the other end abuts against the pressure detection element 19. It should be noted that the electric push rod is prior art and will not be described in detail here.

[0043] The ball-head component 15, through its spherical contact end, contacts the side of the indexing blade 2, serving a pre-positioning function. Because the spherical contact end forms a defined contact point, it reduces the impact of local flatness errors on the side of the indexing blade 2 on the pre-positioning process. The sliding sleeve 16 moves along the limiting groove via the limiting slider 18, allowing the ball-head component 15 to approach or move away from the indexing blade 2 within a defined range. The elastic element 17 is located between the sliding sleeve 16 and the pressure sensing element 19, enabling lateral forces on the indexing blade 2 to be transmitted to the pressure sensing element 19 via the ball-head component 15, the sliding sleeve 16, and the elastic element 17.

[0044] The sliding stroke of the ball joint 15 is no more than 35% of the cutting edge length of the indexable insert 2, because the displacement after deformation and breakage of the cutting tool usually does not exceed 30% of the length of a single cutting edge. Two positioning and reset units are respectively arranged on the outer sides of the positioning edges on both sides of the indexable insert 2. The fixing bolt 5 constitutes the rotation center of the indexable insert 2 when it rotates out of position. When the indexable insert 2 rotates out of position around the fixing bolt 5 in a clockwise or counterclockwise direction during cutting, the ball joint 15, the sliding sleeve 16 and the elastic element 17 located on the out-of-position side are displaced along the limiting groove, and the pressure detection element 19 detects the corresponding pressure change.

[0045] The pressure detection element 19 is disposed on the force transmission path of the positioning and resetting unit. The pressure detection element 19 can be disposed at the end of the elastic element 17 away from the sliding sleeve 16, for receiving the pressure transmitted by the elastic element 17. The pressure detection element 19 is electrically connected to the control assembly 6 and is capable of transmitting the detected pressure information to the control assembly 6.

[0046] The control assembly 6 includes a circuit control board, a pressure acquisition interface, a reset output interface, and a proportioning output interface. The pressure acquisition interface is electrically connected to the pressure detection element 19 and is used to receive the pressure signal output by the pressure detection element 19. The reset output interface is electrically connected to the positioning reset unit and is used to output a reset control signal to the positioning reset unit. The proportioning output interface is electrically connected to the first pusher and the second pusher respectively, and is used to control the pushing actions of the first pusher and the second pusher respectively.

[0047] When abnormal pressure occurs during the cutting process due to hardener breakage or indexing insert displacement, the control assembly 6 will drive the electric push rod to push the ball head 15 on the misaligned side to push the indexing insert back to the correct position, and automatically release new hardener to fill the damaged gap, realizing on-machine and online self-resetting of the cutting tool.

[0048] By reserving a gap and filling it with a curing agent, a completely new and perfectly fitting contact interface can be formed after each indexing, without relying on the integrity of the original positioning surface, thus effectively solving the problem of poor repeatability of indexing cutting tools.

[0049] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of the present invention are within the scope of protection of the present invention.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A backlash-free, resettable cutting tool, characterized in that, include: The handle body (1) has a blade mounting position at its front end, and gap forming surfaces are respectively provided on the opposite sides of the blade mounting position; The indexing blade (2) is disposed in the blade mounting position. The opposite two sides of the indexing blade (2) are respectively spaced apart from the corresponding gaps, and a filling gap (3) is formed between the indexing blade (2) and the tool holder body (1). A clamping assembly is disposed at the front end of the tool holder body (1) and is clamped onto the indexing blade (2); The positioning and resetting assembly includes two positioning and resetting units respectively disposed on opposite sides of the indexing blade (2). Each positioning and resetting unit includes a sliding sleeve (16), an elastic element (17) abutting the bottom end of the sliding sleeve (16), and a ball head (15) disposed inside the sliding sleeve (16). The ball head (15) has a spherical contact end abutting the side of the indexing blade (2). A filling assembly is used to fill the filling gap (3) with a curing agent so that the filling gap (3) forms a cured filling layer that adheres to the tool holder body (1) and the indexing blade (2); the filling assembly includes a first storage component (9), a second storage component (10), a first pusher, a second pusher, a first discharge channel (11) and a second discharge channel (12) disposed on the tool holder body (1), the first discharge channel (11) communicating with the first storage component (9), the second discharge channel (12) communicating with the second storage component (10), and the outlets of the first discharge channel (11) and the second discharge channel (12) both facing the filling gap (3); the first pusher and the second pusher act on the first storage component (9) and the second storage component (10) respectively. Pressure detection element (19) is disposed at the bottom end of the elastic element (17) or between the elastic element (17) and the sliding sleeve (16); The control assembly (6) is electrically connected to the pressure detection element (19), the pusher of the filling assembly, and the positioning reset unit, respectively.

2. The backlash-free resettable turning tool according to claim 1, characterized in that, The handle body (1) includes a handle and a mounting head (4) disposed at the front end of the handle; the blade mounting position is disposed on the mounting head (4); the mounting head (4) is provided with a fixing hole, which is corresponding to the center mounting hole of the indexing blade (2); the mounting head (4) is also provided with a wiring cavity, and at least a part of the structure of the control assembly (6) is disposed in the wiring cavity.

3. The backlash-free resettable turning tool according to claim 2, characterized in that, The clamping assembly includes a pressure cap (7), a pressure block nail (8), and a fixing bolt (5); the pressure cap (7) is fixed to the front end of the tool holder body (1) and covers at least part of the structure of the control assembly (6); one end of the pressure block nail (8) is disposed on the pressure cap (7), and the other end abuts against the indexing blade (2); the fixing bolt (5) passes through the center mounting hole of the indexing blade (2) and is connected to the tool holder body (1).

4. The backlash-free resettable cutting tool according to claim 1, characterized in that, The first discharge channel (11) and the second discharge channel (12) are both through holes provided in the tool holder body (1); the through hole includes a short side hole section near the side of the indexing blade (2) and a long side hole section away from the side of the indexing blade (2); the depth of the short side hole section along the axial direction of the discharge channel is 5-8mm; the depth of the long side hole section along the axial direction of the discharge channel is 15-18mm.

5. The backlash-free resettable turning tool according to claim 1, characterized in that, The filling gap (3) is located on opposite sides of the indexing blade (2); the width of the filling gap (3) on one side is 2-4mm; the height of the filling gap (3) is not less than 4.5mm; and the length of the filling gap (3) is 14-20mm.

6. The backlash-free resettable turning tool according to claim 1, characterized in that, Each of the positioning and reset units further includes an electric push rod and a limiting slider (18); the ball head (15) has the spherical contact end; the ball head (15) is movably connected to the sliding sleeve (16) and driven by the electric push rod; the sliding sleeve (16) is slidably connected to the tool holder body (1); the limiting slider (18) is disposed on the side of the sliding sleeve (16) and slides in cooperation with the limiting groove on the tool holder body (1).

7. The backlash-free resettable turning tool according to claim 6, characterized in that, The sliding stroke of the ball end piece (15) is no more than 35% of the cutting edge length of the indexing insert (2).

8. The backlash-free resettable cutting tool according to claim 1, characterized in that, The indexing blade (2) is a triangular blade or a quadrilateral blade; the shape of the blade mounting position corresponds to the shape of the indexing blade (2).

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