Replaceable fine boring cutter with pin key linkage locking structure

Abstract

The present application relates to the technical field of fine boring cutter, and particularly relates to a replacement type fine boring cutter with pin key linkage locking structure, which comprises a cutter handle, one end of the cutter handle is provided with a cutter body, an installation groove is formed in the cutter body, a fixed block is arranged inside the installation groove close to the center position, installation units are symmetrically arranged on both sides of the fixed block inside the installation groove, and unfolding openings are symmetrically formed on the top and bottom of the installation units inside the installation groove; the installation unit comprises an installation key which is slidably installed in the installation groove. The installation key and the limiting shaft are cooperated to stably unfold, the positioning pin is accurately positioned, the tool changing is convenient and efficient, the elastic member one and the elastic member two push component linkage realizes double locking, the centrifugal force strengthens the locking force, the processing stability is ensured, the positioning pin and the taper structure of the cutter handle improve the processing precision, and the fine machining demand is adapted.

Description

Technical Field

[0001] This invention relates to the field of precision boring tool technology, and in particular to a replaceable precision boring tool with a key-linked locking structure. Background Technology

[0002] Precision boring tools are core tools for precision hole machining, widely used in machinery manufacturing, aerospace, and other fields. Their tool changing efficiency directly determines the production cycle time and affects the production efficiency of batch processing. Existing tool change methods for precision boring tools have significant drawbacks; the tool changing operation is cumbersome, which has become a key issue restricting the improvement of machining efficiency.

[0003] In existing technologies, the replacement of precision boring tool blocks mostly relies on screw locking or elastic collet locking structures, both of which require the use of auxiliary tools such as wrenches. During replacement, operators need to repeatedly tighten the screws or adjust the collet to disassemble and fix the tool block. The entire tool replacement process is time-consuming, making rapid tool replacement impossible and severely slowing down the production pace.

[0004] In addition, the existing tool changing method is cumbersome. The steps of disassembling the old tool block, calibrating the position of the new tool block, and locking it must be done one by one. This not only increases the workload of the operators, but also makes it easy to make mistakes in tool changing due to too many steps, which further affects production efficiency. Summary of the Invention

[0005] This invention provides a replaceable precision boring tool with a key-linked locking structure to solve the problems mentioned in the background art, such as cumbersome tool changing operations, long time consumption, need for auxiliary tools, and complex steps, which seriously affect production efficiency and cannot meet the demand for efficient tool changing in the field of precision machining.

[0006] To solve the above technical problems, the present invention adopts a technical solution as follows: a replaceable precision boring tool with a key-linkage locking structure is provided, including a tool holder, a tool body is provided at one end of the tool holder, an installation groove is provided inside the tool body, a fixing block is provided near the center of the installation groove, installation units are symmetrically arranged on both sides of the fixing block inside the installation groove, and unfolding openings are symmetrically opened at the top and bottom of the installation units inside the installation groove. The installation unit includes an installation key that is slidably installed inside the installation slot. One end of the installation key has a fixing slot for installing a blade. A positioning pin is provided inside the fixing slot. A locking slot is provided through the outer wall of the installation key at the position corresponding to the unfolding opening. A limiting shaft is slidably connected inside the locking slot. Both ends of the limiting shaft are fixed to the inner wall of the unfolding opening. A locking block is slidably installed on the outer wall of the fixing block near the mounting key. A pressing slope one is formed on the inner wall of the locking block near the mounting key. A pressing slope two is symmetrically formed on the top and bottom of the side of the locking block away from the mounting key. A mating surface two is formed on the outer wall of the mounting key corresponding to the pressing slope one. A locking unit is provided inside the fixing block between the locking blocks.

[0007] The present invention is further configured such that the two mounting keys are arranged as a group, and the two mounting keys are symmetrically provided with mounting openings on opposite sides, and the mounting openings are provided with elastic elements.

[0008] The present invention is further configured such that the locking unit includes a locking plate slidably connected to the outer wall of the fixing block, and a mating surface is provided on the outer wall of the locking plate at a position corresponding to the second extrusion slope. The mating surface is slidably connected to the second extrusion slope, and a lever is provided on the end of the locking plate away from the locking block.

[0009] The present invention is further configured such that the card plate is provided in two groups of two, one above the other, and an elastic element is provided between the two groups of card plates. A connecting plate is provided at the bottom of the upper card plate in one group of card plates, and an elastic element is provided on the side of the connecting plate near the locking block.

[0010] The present invention is further configured such that, in a set of card plates, the other one located at the bottom position is provided with a connecting rod at the position corresponding to the connecting plate, the connecting rod is provided with a connecting groove near the outer wall of the connecting plate, and a limiting block is provided on the outer wall of the connecting plate at the position corresponding to the connecting groove, the limiting block being engaged inside the connecting groove and slidably connected thereto.

[0011] The invention is further configured such that the handle is generally tapered, and a connecting hole is provided at the end of the handle away from the blade.

[0012] The present invention is further configured such that a rotating opening is provided through the other end of the mounting key near the lock opening, the rotating opening is connected to the lock opening, and the limiting shaft slides in cooperation with the lock opening and the rotating opening.

[0013] The invention is further configured such that the width of the locking opening is slightly greater than the length of the narrow side of the limiting shaft, so that when the mounting key is connected to the limiting shaft through the locking opening, it can only move parallel to the limiting shaft; and the diameter of the rotating opening is slightly greater than the length of the wide side of the limiting shaft, so that when the mounting key is connected to the limiting shaft through the rotating opening, it can rotate around the limiting shaft as the center.

[0014] The beneficial effects of the replaceable precision boring tool with a key-linked locking structure of the present invention are as follows: 1. Tool changing is convenient and efficient, requiring no complicated auxiliary tools. The interlocking mechanism of the lever, clamping plate, and locking block allows for quick unlocking of the installation unit by simply moving the lever. The installation key and the limit shaft, through the cooperation of the locking and rotating ports, allow for smooth unfolding and exposure of the fixing slot. The positioning pin provides precise positioning for the blade, eliminating the need for repeated calibration. This significantly simplifies the tool changing process, reduces tool changing time, lowers the workload of operators, and solves the problems of cumbersome and error-prone tool changing in existing systems.

[0015] 2. Reliable and stable locking, with the ability to automatically improve locking effect at high speeds. Elastic elements one and two push the locking plate and lock in tandem, cooperating with the docking of the locking port and the limit shaft to achieve double locking of the installation unit. The pressing bevel of the locking block one and the mating surface of the mounting key two, as well as the mating surface of the locking plate one and the pressing bevel of the locking block two, precisely fit together. The centrifugal force generated by high-speed rotation strengthens the locking force; the higher the rotation speed, the stronger the locking, preventing the cutting tool from loosening or the locking from failing during processing, thus ensuring processing stability.

[0016] 3. High machining accuracy, suitable for precision machining needs. The locating pin ensures the coaxiality of the insert installation and avoids positional deviation; the tapered structure of the tool holder precisely fits with the tapered hole of the machine tool spindle, achieving reliable centering and positioning, eliminating radial backlash, reducing machining wobbling, effectively improving the dimensional accuracy and surface quality of precision boring, and solving the problems of centering deviation and insufficient machining accuracy of existing precision boring tools. Attached Figure Description

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the following description is provided in conjunction with the accompanying drawings. Please provide a detailed explanation.

[0018] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] Figure 1 This is a three-dimensional structural diagram of a replaceable precision boring tool with a key-linked locking structure according to the present invention. Figure 2This is a side view of a replaceable precision boring tool with a key-linked locking structure according to the present invention. Figure 3 This is a diagram showing the morphological switching of a replaceable precision boring tool with a key-linked locking structure according to the present invention. Figure 4 This is a cross-sectional view of a replaceable precision boring tool with a key-linked locking structure according to the present invention. Figure 5 This is a partial view of a replaceable precision boring tool with a key-linked locking structure according to the present invention; Figure 6 This is a detached view of the mounting unit of a replaceable precision boring tool with a key-linked locking structure according to the present invention; Figure 7 This is a partial diagram of the locking unit of a replaceable precision boring tool with a key-linked locking structure according to the present invention.

[0020] The markings in the diagram are as follows: 1. Tool holder; 11. Connecting hole; 2. Tool body; 21. Mounting groove; 22. Unfolding opening; 3. Fixing block; 4. Locking block; 41. Extrusion bevel one; 42. Extrusion bevel two; 5. Locking unit; 51. Clamping plate; 511. Connecting rod; 512. Connecting groove; 513. Connecting plate; 514. Limiting block; 515. Elastic element two; 52. Pulling block; 53. Dating surface one; 54. Elastic element one; 6. Mounting unit; 61. Mounting key; 62. Fixing groove; 621. Positioning pin; 63. Limiting shaft; 64. Rotation opening; 65. Locking opening; 66. Dating surface two; 67. Mounting opening two; 671. Elastic element three. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. 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, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a transmission connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two elements or the interaction between two elements.

[0023] Please see Figure 1 - Figure 7 A replaceable precision boring tool with a key-linked locking structure includes a tool holder 1, a tool body 2 at one end of the tool holder 1, the tool holder 1 being tapered in shape, a connecting hole 11 at the end of the tool holder 1 away from the tool body 2, a mounting groove 21 inside the tool body 2, a fixing block 3 near the center of the mounting groove 21, mounting units 6 symmetrically arranged on both sides of the fixing block 3 inside the mounting groove 21, and openings 22 symmetrically arranged at the top and bottom of the mounting units 6 inside the mounting groove 21. The mounting unit 6 includes a mounting key 61 that is slidably mounted inside the mounting slot 21. One end of the mounting key 61 has a fixing slot 62 for mounting a blade. A positioning pin 621 is provided inside the fixing slot 62. A locking slot 65 is provided through the outer wall of the mounting key 61 at the position corresponding to the unfolding opening 22. A limiting shaft 63 is slidably connected inside the locking slot 65. Both ends of the limiting shaft 63 are fixed to the inner wall of the unfolding opening 22. A locking block 4 is slidably installed on the outer wall of the fixing block 3 near the mounting key 61. A pressing slope 41 is provided on the inner wall of the locking block 4 near the mounting key 61. A pressing slope 42 is symmetrically provided on the top and bottom of the side of the locking block 4 away from the mounting key 61. A mating surface 66 is provided on the outer wall of the mounting key 61 corresponding to the pressing slope 41. A locking unit 5 is provided inside the fixing block 3 between the locking blocks 4.

[0024] By adopting the above technical solution, the handle 1 and the blade 2 form a rigid integrated structure. The fixing block 3 and the installation unit 6 in the mounting groove 21 work together to form a clamping system. The mounting key 61 cooperates with the limiting shaft 63 through the locking port 65 to achieve precise sliding limit. The positioning pin 621 ensures the installation accuracy of the blade. The double inclined surface of the locking block 4 works in conjunction with the mounting key 61 and the locking unit 5 to transmit power. Dynamic locking forms a positive feedback of speed and clamping force. The dual function of the limiting shaft 63 works with the blade 2 to achieve uniform force transmission. The overall structure stability and transmission accuracy are improved.

[0025] Two mounting keys 61 are arranged in a group, one above the other. A second mounting opening 67 is symmetrically formed on one side of each mounting key 61, and an elastic element 671 is installed inside the second mounting opening 67. A rotating opening 64 is formed at the other end of each mounting key 61 near the locking opening 65. The rotating opening 64 is connected to the locking opening 65, and the limiting shaft 63 slides in cooperation with the locking opening 65 and the rotating opening 64. The width of the locking opening 65 is slightly larger than the length of the narrow side of the limiting shaft 63, allowing the mounting key 61 to move parallel to the limiting shaft 63 when it mates with the limiting shaft 63 via the locking opening 65. The diameter of the rotating opening 64 is slightly larger than the length of the wide side of the limiting shaft 63, allowing the mounting key 61 to rotate around the limiting shaft 63 when it mates with the limiting shaft 63 via the rotating opening 64.

[0026] By adopting the above technical solution, the mounting key 61 cooperates with the limiting shaft 63 through the locking port 65, the rotating port 64, and the locking port 63 to achieve dual-mode motion control and multi-degree-of-freedom adjustment; the elastic element 671 is symmetrically arranged in the mounting port 67 to ensure that the mounting key 61 separates evenly without deviation; the limiting shaft 63 is precisely matched with the locking port 65 and the rotating port 64, and the rotating port 64 is connected to the locking port 65 to achieve continuous motion switching; the limiting shaft 63 and the elastic element 671 form a dynamic balance, and the overall coordination ensures motion accuracy and high-speed cutting stability.

[0027] The locking unit 5 includes a locking plate 51 that is slidably connected to the outer wall of the fixing block 3. A mating surface 53 is provided on the outer wall of the locking plate 51 at a position corresponding to the second pressing slope 42. The first mating surface 53 is slidably connected to the second pressing slope 42. A lever 52 is provided on the end of the locking plate 51 away from the locking block 4. Two sets of locking plates 51 are provided, one upper and one lower. An elastic element 54 is provided between the two sets of locking plates 51. A connecting plate 513 is provided at the bottom of the upper set of locking plates 511, and an elastic element 515 is provided on the side of the connecting plate 513 near the locking block 4. A connecting rod 511 is provided at the top of the lower set of locking plates 511 at a position corresponding to the connecting plate 513. A connecting groove 512 is provided on the outer wall of the connecting rod 511 near the connecting plate 513. A limiting block 514 is provided on the outer wall of the connecting plate 513 at a position corresponding to the connecting groove 512. The limiting block 514 is engaged inside the connecting groove 512 and slidably connected to it.

[0028] By adopting the above technical solution, the two sets of locking plates 51 are connected in both directions through the elastic element 54, and the force is balanced without off-center load; the mating surface 53 of the locking plate 51 and the pressing inclined surface 42 of the locking block 4 form an inclined plane transmission, which saves effort and has self-locking properties; the connecting rod 511 and the connecting plate 513 are interlocked through the limiting locking block 514 and the connecting groove 512 to control the stroke and prevent overload; the elastic element 54 and the elastic element 515 form a double elastic system to ensure stable locking force; the lever 52 cooperates with the linkage mechanism to achieve quick and convenient unlocking.

[0029] Working principle and usage process of this invention: When the precision boring tool is in its normal state without insert replacement, the mounting unit 6 is fully embedded inside the mounting slot 21 of the tool body 2, achieving compact storage of the components and avoiding interference with external structures during machining. At this time, the mounting key 61 engages with the limiting shaft 63 through its locking lug 65. The two ends of the limiting shaft 63 are fixed to the inner wall of the unfolded opening 22, initially restricting the radial movement of the mounting key 61 and providing basic positioning for subsequent locking. The width of the locking lug 65 is very close to the length of the narrow side of the limiting shaft 63. Its main function is to prevent wobbling when the locking lug 65 and the limiting shaft 63 are aligned, while not affecting the normal movement of the limiting shaft 63. The diameter of the rotating opening 64 is also very close to the length of the wide side of the limiting shaft 63, so that there is no wobbling when the rotating opening 64 is aligned with the limiting shaft 63, while not affecting the rotation of the limiting shaft 63.

[0030] In locking unit 5, elastic element 54 plays a core pushing role, pushing the two sets of locking plates 51 to move in opposite directions. As the locking plates 51 move, elastic element 515 on the bottom connecting plate 513 simultaneously pushes the locking block 4 towards the mounting unit 6, ultimately engaging and fixing the two mounting keys 61 inside the locking block 4, thus achieving overall locking of the mounting unit 6. This locking method does not require external auxiliary tools, relying on the elastic force of the elastic elements to achieve automatic locking, which simplifies the initial fixing operation and ensures the stability of the locking, preventing the mounting unit 6 from loosening before processing.

[0031] In addition, the lever 52 on the card plate 51 has a hole. This design makes it easy for the operator to move the lever 52 with simple tools such as needle-nose pliers, which facilitates the subsequent unlocking operation and further improves the convenience of the tool changing process. The two sets of installation keys 61 have elastic elements 671 inside the installation port 67 on the opposite side. At this time, the elastic elements 671 are in a compressed state, which provides elasticity reserve for the subsequent unfolding of the installation keys 61, ensuring that the installation keys 61 can unfold quickly and smoothly when changing tools.

[0032] When it is necessary to disassemble or install the blade, the operator can first insert needle-nose pliers or other simple tools into the hole of the lever 52, and squeeze to make the two levers 52 move relative to each other. The levers 52 drive the corresponding locking plates 51 to move synchronously. When the locking plates 51 move, the elastic element 515 pulls the locking block 4 to move away from the mounting unit 6 until the locking block 4 is completely separated from the mounting key 61, thus unlocking the mounting unit 6. This unlocking process is simple and time-saving, requires no complicated tools, effectively solves the problem of repeated screw tightening and cumbersome operation required for changing tools in existing precision boring tools, and greatly shortens the unlocking time.

[0033] After unlocking, the tail end of the entire mounting unit 6 can be pulled outwards, or the precision boring tool can be kept vertical, allowing gravity to automatically extend the tail end of the mounting unit 6 out of the mounting slot 21. During this process, the mounting key 61 and the limiting shaft 63 cooperate through the locking lug 65, restricting the mounting key 61 to only move in parallel, preventing deviation during movement and ensuring the stability of the unfolding process. When the tail end of the mounting unit 6 is fully extended, the rotating port 64 of the mounting key 61 aligns with the limiting shaft 63. At this point, the tail end of the mounting unit 6 can be turned to rotate outwards from the mounting slot 21 around the limiting shaft 63. When rotated to ninety degrees, most of the structure of the mounting unit 6 extends out of the mounting slot 21, and the front end of the mounting unit 6 is located inside the unfolding opening 22. Since the height of the unfolding opening 22 is greater than the height of the mounting slot 21, the restriction on the elastic element 671 is released. The elastic element 671 releases its elastic force, pushing the two mounting keys 61 open to both sides, fully exposing the fixing slots 62 on the mounting keys 61, facilitating the removal of the cutting tool.

[0034] After the installation key 61 is unfolded, the operator can directly remove the old blade inside the fixing groove 62. The positioning pin 621 inside the fixing groove 62 can play an auxiliary positioning role for the blade, preventing the blade from shaking or shifting before removal. At the same time, the design of the positioning pin 621 can also provide a precise positioning reference for the subsequent installation of new blades, ensuring the coaxiality of the blade installation and improving the machining accuracy.

[0035] When installing a new blade, first place the new blade inside the fixing slot 62 of any of the mounting keys 61, so that the hole on the blade is precisely aligned with the positioning pin 621. The positioning pin 621 can quickly position the blade, avoiding positional deviations during blade installation. This solves the problem of cumbersome calibration steps and easy errors in the existing tool changing process, and improves the accuracy and efficiency of tool changing.

[0036] The operator manually pinches the two mounting keys 61 together, clamping the blade tightly, while simultaneously compressing the elastic element 671. Then, the mounting unit 6 is rotated 90 degrees in the reverse direction, gradually entering the mounting groove 21. At this point, the tail end of the mounting unit 6 remains outside the mounting groove 21, and the rotating opening 64 remains aligned with the limiting shaft 63, ensuring a smooth rotation and reset process and preventing the blade from shifting due to movement.

[0037] The tail end of the mounting unit 6 is then pushed into the mounting groove 21 until the locking port 65 of the mounting key 61 re-aligns with the limiting shaft 63, completing the initial positioning of the mounting unit 6. Simultaneously, the elastic element 54 in the locking unit 5 releases its elastic force, pushing the retaining plate 51 back to its original position. The retaining plate 51, through the elastic element 515, pushes the locking block 4 again towards the mounting key 61, re-locking the mounting key 61 into the locking block 4. Combined with the alignment and limiting of the locking port 65 and the limiting shaft 63, the mounting unit 6 achieves double locking, ensuring the insert is securely and reliably installed and preventing loosening during machining. The entire installation process eliminates the need for repeated calibration and twisting of components, significantly improving tool changing efficiency. The double locking structure also ensures the stability of the insert installation, meeting the precision requirements of fine boring.

[0038] After the cutting tool is replaced, when installing the precision boring tool onto the machine tool, first precisely align the tapered outer contour of the tool holder 1 with the tapered hole of the machine tool spindle. The two are high-precision mating surfaces. The tight fit of the tapered surfaces achieves radial centering and circumferential positioning of the precision boring tool, effectively eliminating the radial clearance between the tool holder 1 and the machine tool spindle, ensuring the coaxiality of the precision boring tool during rotation, avoiding shaking during machining due to centering deviation, ensuring the dimensional accuracy and surface quality of precision boring, and solving the problem that centering deviation during the installation of existing precision boring tools can easily affect machining accuracy.

[0039] The tool holder 1 has a connecting hole 11 at the end furthest from the tool body 2. The connecting hole 11 is an internally threaded hole for installing a machine tool-specific pull stud. After the pull stud is installed into the connecting hole 11, it engages with the hydraulic or pneumatic pull rod mechanism inside the machine tool spindle. Through the axial contraction force of the pull rod, the tapered surface of the tool holder 1 is tightly pressed against the tapered hole of the machine tool spindle, achieving axial locking and fixation of the precision boring tool. This fixing method can effectively prevent axial movement of the precision boring tool or spindle loosening during high-speed rotation and cutting force, ensuring connection rigidity during machining and improving machining stability and safety.

[0040] When the precision boring tool rotates at high speed under the drive of the machine tool, it generates a certain centrifugal force. This centrifugal force not only does not affect the locking effect, but also achieves self-reinforcement of the locking force, further ensuring machining stability. Due to the precise fit between the limit shaft 63 and the locking jaw 65, the mounting key 61 will not wobble due to centrifugal force, but the cutting tool may have a slight tendency to loosen. At this time, the centrifugal force will push the clamping plate 51 and the locking block 4 towards the mounting key 61, thereby achieving locking reinforcement. When the locking block 4 is pressing, through the interaction between its own pressing inclined surface 41 and the mating surface 66 of the mounting key 61, it applies opposing pressing forces to the two mounting keys 61, causing the two mounting keys 61 to move further towards the middle, thereby clamping the cutting tool. The higher the rotation speed of the precision boring tool, the greater the centrifugal force generated, the greater the pressing force of the locking block 4 on the mounting key 61, and the greater the clamping force of the cutting tool, achieving the effect of "the higher the rotation speed, the stronger the locking," effectively preventing the cutting tool from loosening during high-speed cutting and ensuring machining accuracy.

[0041] Under the combined push of centrifugal force and elastic element 54, the locking plate 51 moves synchronously towards the locking block 4. The mating surface 53 on the locking plate 51 is always in close contact with the pressing inclined surface 42 of the locking block 4. At the same time, the two locking plates 51 in the set are slidably connected. During the process of the locking plate 51 pressing the locking block 4, the pressing inclined surface 42 guides one outer wall of the locking plate 51 to be in close contact with the inner wall of the mounting groove 21. The greater the centrifugal force, the higher the degree of contact between the locking plate 51 and the mounting groove 21. The locking plate 51 is locked between the locking block 4, the pressing inclined surface 42, and the mounting groove 21, further enhancing the pressing and locking force on the mounting key 61. Under this structure, the locking block 4 cannot move back on its own. If the locking block 4 shows a tendency to move back, the pressing inclined surface 42 will press the mating surface 53 of the locking plate 51, further enhancing the degree of contact between the locking plate 51 and the mounting groove 21, achieving a locked and fixed state of the locking block 4, and completely avoiding locking failure. To unlock, simply pull the latch plate 51 using the lever 52, achieving the dual advantages of "reliable locking and convenient unlocking," thus solving the problem of loose locking that easily occurs during high-speed machining of existing precision boring tools.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A replaceable precision boring tool with a key-locking structure, characterized in that, include: A handle (1) is provided with a blade (2) at one end of the handle (1). A mounting groove (21) is provided inside the blade (2). A fixing block (3) is provided near the center inside the mounting groove (21). Mounting units (6) are symmetrically arranged on both sides of the fixing block (3) inside the mounting groove (21). An opening (22) is symmetrically opened at the top and bottom of the mounting unit (6) inside the mounting groove (21). The installation unit (6) includes an installation key (61) that is slidably installed inside the installation slot (21). One end of the installation key (61) is provided with a fixing slot (62) for installing a blade. A positioning pin (621) is provided inside the fixing slot (62). A locking slot (65) is provided through the outer wall of the installation key (61) at the position corresponding to the unfolding opening (22). A limiting shaft (63) is slidably connected inside the locking slot (65). The two ends of the limiting shaft (63) are fixed to the inner wall of the unfolding opening (22). A locking block (4) is slidably installed on the outer wall of the fixing block (3) near the mounting key (61). A pressing slope one (41) is opened on the inner wall of the locking block (4) near the mounting key (61). A pressing slope two (42) is symmetrically opened on the top and bottom of the side of the locking block (4) away from the mounting key (61). A mating surface two (66) is opened on the outer wall of the mounting key (61) corresponding to the pressing slope one (41). A locking unit (5) is provided inside the fixing block (3) between the locking blocks (4).

2. The replaceable precision boring tool with a key-linked locking structure according to claim 1, characterized in that: The mounting keys (61) are arranged in pairs, one above the other. The two mounting keys (61) are symmetrically provided with mounting ports (67) on opposite sides. An elastic element (671) is provided inside the mounting port (67).

3. The replaceable precision boring tool with a key-locking structure according to claim 1, characterized in that: The locking unit (5) includes a card plate (51) that is slidably connected to the outer wall of the fixing block (3). The outer wall of the card plate (51) is provided with a mating surface (53) at the position corresponding to the second extrusion slope (42). The mating surface (53) is slidably connected to the second extrusion slope (42). A lever (52) is provided on the side end of the card plate (51) away from the locking block (4).

4. A replaceable precision boring tool with a key-linked locking structure according to claim 3, characterized in that: The card plate (51) is provided in two groups, one above the other. An elastic element (54) is provided between the two groups of card plates (51). A connecting plate (513) is provided at the bottom of the upper one of the card plates (51). An elastic element (515) is provided on the side of the connecting plate (513) near the locking block (4).

5. A replaceable precision boring tool with a key-linked locking structure according to claim 4, characterized in that: A connecting rod (511) is provided at the top of the lower position of the set of card plates (51) corresponding to the position of the connecting plate (513). The connecting rod (511) has a connecting groove (512) near the outer wall of the connecting plate (513). A limiting block (514) is provided on the outer wall of the connecting plate (513) corresponding to the position of the connecting groove (512). The limiting block (514) is locked inside the connecting groove (512) and slidably connected to it.

6. A replaceable precision boring tool with a key-linked locking structure according to claim 1, characterized in that: The handle (1) is generally conical, and a connecting hole (11) is provided at the end of the handle (1) away from the blade (2).

7. A replaceable precision boring tool with a key-linked locking structure according to claim 1, characterized in that: The other end of the mounting key (61) is provided with a rotating opening (64) near the lock opening (65). The rotating opening (64) is connected to the lock opening (65), and the limiting shaft (63) is in sliding cooperation with the lock opening (65) and the rotating opening (64).

8. A replaceable precision boring tool with a key-linked locking structure according to claim 7, characterized in that: The width of the locking port (65) is slightly greater than the length of the narrow side of the limiting shaft (63), so that when the mounting key (61) is connected to the limiting shaft (63) through the locking port (65), it can only move parallel to the limiting shaft (63). The diameter of the rotating port (64) is slightly greater than the length of the wide side of the limiting shaft (63), so that when the mounting key (61) is connected to the limiting shaft (63) through the rotating port (64), it can rotate around the limiting shaft (63) as the center.

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