PCD thread milling cutter with positioning structure

Abstract

The invention relates to the technical field of thread milling cutters, in particular to a PCD thread milling cutter with a positioning structure, the PCD thread milling cutter comprises a milling cutter bar, a PCD blade, a fastening bolt and a positioning assembly, a mounting groove is formed in the end of the milling cutter bar, a threaded hole is formed in the mounting groove, the PCD blade is mounted in the mounting groove, a mounting hole is formed in the PCD blade, and the PCD blade is mounted in the threaded hole. The fastening bolt penetrates through the mounting hole and is fixedly connected with the threaded hole, a matching groove is formed in the milling cutter bar, the positioning assembly is mounted in the matching groove, a pressing plate is arranged in the matching groove, the bottom of the fastening bolt is in contact with the surface of the pressing plate, and the pressing plate drives the positioning assembly to work. Pressure is provided through the positioning assembly, so that the PCD blade is conveniently and accurately installed, the PCD blade is prevented from being displaced due to inclination force during installation, the cutting diameter of the thread milling cutter is guaranteed, the cutting quality of the thread milling cutter on materials is guaranteed, and the machining efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thread milling cutters, in particular to a PCD thread milling cutter with a positioning structure. Background Art

[0002] The traditional thread processing method mainly uses a thread turning tool to turn the thread or uses a tap and a die to manually tap and thread the thread. Compared with the traditional thread processing method, thread milling has great advantages in processing accuracy and processing efficiency. It is difficult to process using traditional turning methods or taps and dies, but it is very easy to achieve using CNC milling. In addition, in the process of CNC milling threads, it is extremely convenient to adjust the thread diameter size, which is difficult to do using taps and dies. PCD thread milling cutter is a tool made by welding polycrystalline diamond (PCD) composite sheets to a steel matrix tool bar. It is mainly used for milling internal and external threads, steps, and grooves. PCD thread milling cutter is particularly suitable for processing non-ferrous metals and non-metallic materials, such as aluminum, aluminum alloys, etc. Friction loss will inevitably occur during the use of thread milling cutters. At this time, the blade of the thread milling cutter needs to be replaced. When replacing the blade, it is necessary to align the mounting hole with the limit hole, and use bolts to pass through the mounting hole and the limit hole in turn to position the blade. The hole wall of the traditional mounting hole is a straight surface, and the bolt has the same cross-sectional radius as the mounting hole. When installing the connecting parts, it is difficult for the bolt to align with the mounting hole and penetrate the limit hole. In addition, during the penetration process, since the bolt and the hole wall of the mounting hole fit tightly, the hole wall creates resistance to the bolt due to friction, which increases the difficulty of installation, takes a long time, and affects the processing efficiency.

[0003] In order to avoid the frictional resistance of the hole wall to the bolt during the process of the bolt passing through the mounting hole and the limiting hole, which increases the difficulty of installation, takes a long time, and affects the processing efficiency, the invention patent with application number CN202120302227.7 provides a self-positioning comb thread milling cutter installation structure, which is provided by setting the blade on the mounting clamp along the peripheral surface of the mounting clamp, the blade is provided with a limiting hole, the mounting clamp is provided with a mounting groove, the mounting groove is provided with a mounting hole corresponding to the blade limiting hole, and a connecting piece is provided on the mounting clamp, the connecting piece passes through the mounting hole into the limiting hole, thereby pressing the blade; the hole wall of the mounting hole has an arc surface. Such a structure changes the hole wall of the mounting hole from a straight surface to an arc surface, so that when the connecting piece enters the mounting hole, the hole wall of the mounting hole changes from a completely tight surface contact to a line contact, reducing the frictional resistance of the hole wall of the mounting hole to the connecting piece, thereby making it simple and easy to replace the blade. However, when workers rotate and tighten the bolts, they need to align the blade with the reference surface of the tool rod and press it on the tool rod. During the rotation of the bolt, there may be a tilting force that causes the blade to deviate from the original installation position. At this time, the worker needs to adjust the installation position, which increases the difficulty of installation and takes a long time. If the blade is installed offset from the original installation position, the milling diameter of the thread milling cutter will increase. The thread milling cutter blade will shift during the cutting process, affecting the material cutting quality and reducing the processing efficiency.

[0004] Therefore, in order to prevent workers from encountering installation difficulties during the blade replacement process and affecting the processing efficiency, a PCD thread milling cutter with a positioning structure is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a PCD thread milling cutter with a positioning structure. In order to avoid the problem that the blade deviates from the original installation position due to the influence of the tilting force when the thread milling cutter blade is replaced, causing the cutting diameter of the thread milling cutter to change, affecting the material cutting quality and reducing the processing efficiency, a positioning component is installed on the milling cutter arbor. When the fastening bolts are tightened to fix the PCD blade on the milling cutter arbor, the fastening bolts drive the positioning component to work, and the positioning component makes the PCD blade fit with the installation reference surface, thereby improving the convenience of replacing the thread milling cutter blade, ensuring the cutting quality of the thread milling cutter on the material, and improving the processing efficiency.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A PCD thread milling cutter with a positioning structure comprises a milling cutter arbor, a PCD blade, a fastening bolt, and a positioning assembly, wherein the end of the milling cutter arbor is provided with a mounting groove, the side wall of the mounting groove is a mounting reference surface, the mounting groove is provided with a threaded hole, the PCD blade is installed in the mounting groove, and the side is flush with the mounting reference surface, the PCD blade is provided with a mounting hole, the fastening bolt passes through the mounting hole and is fastened to the threaded hole to fix the PCD blade in the mounting groove, a matching groove is provided inside the milling cutter arbor, the matching groove passes through the bottom of the milling cutter arbor, the positioning assembly is installed in the matching groove, a positioning plate is installed in the matching groove, the positioning assembly is connected to the positioning plate, a pressing plate is provided in the matching groove, the bottom of the fastening bolt contacts the surface of the pressing plate, and the pressing plate drives the positioning assembly to make the positioning plate fit the side wall of the PCD blade with the mounting reference surface.

[0008] By installing the positioning component in the matching groove, the pressing plate is fitted with the positioning component, and the pressing plate is located below the threaded hole. When the fastening bolt passes through the mounting hole and matches with the threaded hole, the fastening bolt rotates downward continuously, and the pressing plate moves vertically downward under pressure. The movement of the pressing plate drives the positioning component to work, and the positioning component applies pressure toward the mounting reference surface to the PCD blade. During the rotation of the fastening bolt, the side wall of the PCD blade is fitted with the mounting reference surface, so that when the operator replaces the blade of the thread milling cutter, the rotating fastening bolt brings tilting forces in different directions, causing the blade to deviate from the installation position. Continuously adjusting the position of the PCD blade will increase the installation time, and prevent the PCD blade from deviating from the original installation position after being fixed on the milling cutter arbor by the fastening bolt, thereby ensuring the cutting diameter of the thread milling cutter, avoiding the displacement of the blade during the cutting process of the thread milling cutter, ensuring the cutting quality of the thread milling cutter on the material, and improving the processing efficiency.

[0009] Preferably, the positioning assembly comprises a base plate, a movable frame, a T-shaped rod, and a vertical spring, the base plate is installed in the matching groove, the movable frame is slidably installed on the base plate, the movable frame is arranged in a U shape, the movable frame is provided with two symmetrical inclined slide grooves, the two inclined slide grooves pass through the two side walls of the movable frame, the two inclined slide grooves are made of rubber material, the T-shaped rod is installed inside the movable frame, and the two ends of the T-shaped rod pass through the two inclined slide grooves, the vertical spring is fixedly installed on the base plate, one end of the vertical spring is fixedly connected to the bottom of the T-shaped rod, the positioning plate is fixedly installed on the side wall of the movable frame, the positioning plate is arranged in an L shape, a positioning groove is provided on the milling cutter rod, the positioning plate is located in the positioning groove and can be limitedly moved in the horizontal direction, the positioning plate is slidably fitted with one side wall of the PCD blade, the T-shaped rod is provided with a pressing groove, the pressing plate is slidably installed on the pressing groove, and a self-locking assembly is installed on the movable frame, and the self-locking assembly is used to limit the unidirectional movement of the movable frame.

[0010] By sliding the moving frame on the bottom plate, the moving frame can move in the horizontal direction with a certain limit, the side walls of the U-shaped moving frame are set to rectangles, the inclined slide groove is in the shape of a key groove, the line connecting the two end points of the inclined slide groove is parallel to the diagonal line of the side wall of the moving frame, the two ends of the T-shaped rod are set to cylindrical shapes, and the two ends are respectively located in two symmetrical inclined slide grooves, the inclined slide groove is made of rubber material, and the inclined slide groove can be elastically deformed when it is squeezed. Under the thrust of the vertical spring, the T-shaped rod is located at the upper end point inside the inclined slide groove. When the fastening bolt rotates downward continuously, the pressing plate is subjected to the pressure of the bottom of the fastening bolt, and the T-shaped rod is also subjected to the same pressure. The T-shaped rod moves vertically downward, the T-shaped rod and the inclined slide groove slide relative to each other, the vertical spring is compressed, and due to the limitation of the inclined slide groove, the T-shaped rod During the relative sliding process with the inclined slide groove, the moving frame will move in the horizontal direction at the same time, and the locking component will limit the movement of the moving frame in a single direction. At this time, the L-shaped positioning plate moves with the moving frame. When the PCD blade is placed in the installation groove, the positioning groove is obliquely below the PCD blade, and the positioning plate moves in the positioning groove toward the installation reference surface. The positioning plate applies horizontal pressure to the side wall of the PCD blade, so that the other side wall of the PCD blade is close to the installation reference surface, thereby preventing the PCD blade from being subjected to tilting forces in different directions when the operator replaces the blade of the thread milling cutter, causing the PCD blade to deviate from the original installation position, thereby ensuring the cutting diameter of the thread milling cutter after the PCD blade is installed, ensuring the cutting quality, and preventing the blade from shifting during the operation of the thread milling cutter, thereby increasing the service life of the thread milling cutter.

[0011] Preferably, the self-locking component includes a rectangular frame, a cam wedge block, a reset spring, and a lever. Two rectangular frames are symmetrically installed on the movable frame, and the two rectangular frames can slide in a limited position in the vertical direction. The cam wedge block is installed in the rectangular frame, and the top tangent of the cam wedge block is in the same horizontal plane as the top of the movable frame. The diagonal diameter on one side of the cam wedge block is larger than the diagonal diameter on the other side. The reset spring passes through the middle of the cam wedge block, and both ends of the reset spring are fixed on the inner wall of the rectangular block. The reset spring keeps the center line of the cam wedge block horizontal. The lever is rotatably installed on the inner wall of the movable frame, one end of the lever is rotatably connected to the rectangular frame, and the other end is located in the pressing groove. When the bolt is rotated and tightened, the lever is pressed to rotate, causing the rectangular frame to move in a limited position in the vertical direction.

[0012] Two rectangular frames are symmetrically installed on the moving frame, and the rectangular frames are embedded and slidably installed on the inner side wall of the moving frame. The rectangular frames can only slide in the upper limit in the vertical direction and cannot move in the horizontal direction. When the fastening bolts have not yet applied pressure to the pressing plate, the top tangent of the cam wedge block and the top of the moving frame are in the same horizontal plane, and the top of the cam wedge block is tangent to the inner wall of the matching groove. One end of the lever located in the pressing groove is set as a bent elastic metal. When the fastening bolts are rotated downward to apply pressure to the pressing plate, the end of the lever in the pressing groove will be pressed down by the fastening bolts, and the lever The rod will rotate with the connection of the moving frame as the rotation point. The rotation of the lever will drive the rectangular frame to move upward. At this time, the top of the cam wedge will fit with the inner wall of the matching groove. Since the diagonal diameter of one side of the cam wedge is larger than the diagonal diameter of the other side, the moving frame can only move in one direction in the horizontal direction under the elastic force of the reset spring. The friction between the cam wedge and the inner wall of the matching groove self-locks the moving frame, avoiding the reaction force of the vertical spring causing the moving frame to retreat during the rotation of the fastening bolt, resulting in the positioning plate being unable to work normally, thereby improving the stability of the positioning assembly.

[0013] Preferably, the bottom plate can be detachably installed in the matching groove through the bottom of the milling cutter rod, and a tension component is arranged on the bottom plate, and the tension component can apply an oblique downward tension to the PCD blade.

[0014] By integrally fixing the positioning assembly and the self-locking assembly on the base plate, the overall structure can be modularly disassembled and installed into the milling cutter arbor, which is convenient for production and processing and reduces the production cost of the equipment.

[0015] Preferably, the tension assembly includes a vertical slide rail, a horizontal plate, a tension plate, and a bending spring. Two vertical slide rails are symmetrically fixedly installed on the bottom plate. The horizontal plate is slidably installed on the vertical slide rail. One end of the horizontal plate is located below the pressing plate. The tension plate is rotatably installed on the horizontal plate. The tension plate is set to a J shape. The tension plate is set to an upper and lower segmented type. The two ends of the bending spring are respectively connected to the horizontal plate and the tension plate. A rectangular groove is opened on the milling cutter rod, and the rectangular groove is located above the tension plate. A tensioning groove is opened on the PCD blade, and the tension plate passes through the rectangular groove and is engaged with the tensioning groove.

[0016] By arranging a tension component on the bottom plate, when the fastening bolt has not yet applied pressure to the pressing plate, the tension plate is vertically located in the matching groove and passes through the rectangular groove under the thrust of the bending spring; when the fastening bolt is rotated downward to apply pressure to the pressing plate, the pressing plate moves downward and drives the horizontal plate downward; at this time, the bending spring is stretched, and the tension plate rotates slightly; during the continuous downward movement of the horizontal plate, the two-stage tension plate gradually extends, and the end of the tension plate is engaged with the tightening groove; the tension plate applies an oblique downward tension to the PCD blade, so that the PCD blade is more closely fitted to the bottom surface of the mounting groove and the mounting reference surface, thereby further improving the fixing effect of the positioning component, avoiding the PCD blade from deviating from the original installation position, and improving the installation efficiency and workpiece processing efficiency.

[0017] Preferably, a return spring is fixedly installed below the horizontal plate, and the other end of the return spring is fixedly connected to the bottom plate.

[0018] By fixing a reset spring under the horizontal plate, when the fastening bolt is taken out from the milling cutter arbor, the thrust of the reset spring causes the horizontal plate to move vertically upward, and the end of the horizontal plate slides relative to the vertical guide rail. At the same time, under the thrust of the bending spring, the tension plate shortens and restores to a vertical state, and the end of the tension plate leaves the tightening groove. The linkage between the fastening bolt and the reset spring makes it easy to release the tension of the tension plate on the PCD blade, thereby improving the disassembly and assembly efficiency of the PCD blade.

[0019] Preferably, a plurality of threaded holes are provided in the installation groove, the T-shaped rod extends to both sides below the plurality of threaded holes, a connecting groove is provided on the pressing plate, and the T-shaped rod is clamped in the connecting groove.

[0020] By extending the T-bar to both sides to below multiple threaded holes, when a PCD insert requires multiple threaded holes for installation, the T-bar can be pressed to move vertically downward when the fastening bolts at any position are tightened downward. The T-bar in the connecting groove drives the horizontal plate to move while driving the moving frame to move horizontally, so that the positioning plate applies pressure to the side wall of the PCD insert toward the installation reference surface, thereby improving the fixing effect of the positioning component, preventing the PCD insert from deviating from the original installation position due to the tilting force, and ensuring the installation effect of the PCD insert.

[0021] Preferably, two rectangular sliding blocks are symmetrically fixedly mounted on the bottom plate, two corresponding rectangular sliding grooves are opened in the matching groove, and the rectangular sliding blocks are slidably matched with the rectangular sliding grooves.

[0022] By arranging corresponding rectangular sliding blocks and rectangular sliding grooves in the bottom plate and the matching groove, the rectangular sliding grooves play a role of positioning and guiding when the bottom plate is installed into the matching groove, and also facilitate the matching connection between the bottom plate and the matching groove.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The T-bar is moved downward by tightening the bolts, and the positioning plate applies horizontal pressure to the side wall of the PCD insert to prevent the rotating tightening bolts from causing the tilting forces in different directions to cause the insert to deviate from the installation position, and prevent the PCD insert from deviating from the original installation position after being fixed on the milling cutter shank by the tightening bolts, thereby ensuring the cutting diameter of the thread milling cutter, avoiding the displacement of the insert during the cutting process of the thread milling cutter, ensuring the cutting quality of the thread milling cutter on the material, and improving the processing efficiency.

[0025] 2. Move the rectangular frame by tightening the bolts, and the cam wedge fits against the inner wall of the matching groove. The friction between the cam wedge and the inner wall of the matching groove self-locks the moving frame, preventing the reaction force of the vertical spring from causing the moving frame to retreat during the rotation of the tightening bolts, resulting in the positioning plate being unable to work normally, thereby improving the stability of the positioning assembly.

[0026] 3. By tightening the bolts, the tension component applies an inclined downward tension to the PCD insert, so that the PCD insert fits more closely with the bottom surface of the mounting groove and the mounting reference surface, further improving the fixing effect of the positioning component, preventing the PCD insert from deviating from the original installation position, and improving the installation efficiency and workpiece processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the appearance structure of the present invention;

[0028] Figure 2 It is a schematic cross-sectional view of a PCD insert of the present invention;

[0029] Figure 3 It is a schematic diagram of the positioning assembly and the matching groove structure of the present invention;

[0030] Figure 4 It is a front view of the matching groove structure of the present invention;

[0031] Figure 5 It is a schematic diagram of the fastening bolt and the pressing plate of the present invention being fitted together;

[0032] Figure 6 It is a schematic diagram of the structure of the self-locking component of the present invention;

[0033] Figure 7 It is a cutaway view of the mobile frame structure of the present invention;

[0034] Figure 8 It is a schematic diagram of tightening the fixing bolt of the present invention.

[0035] Fig. 9 It is a schematic diagram of extending the T-bar of the present invention.

[0036] In the figure: 1. milling cutter bar; 11. mounting groove; 12. threaded hole; 13. matching groove; 14. positioning groove; 15. rectangular groove; 2. PCD blade; 21. mounting hole; 22. tensioning groove; 3. fastening bolt; 4. positioning assembly; 41. base plate; 42. movable frame; 421. inclined slide groove; 43. T-bar; 431. pressing groove; 44. positioning plate; 45. vertical spring; 5. pressing plate; 51. connecting groove; 6. self-locking assembly; 61. rectangular frame; 62. cam wedge; 63. reset spring; 64. lever; 7. tension assembly; 71. vertical slide rail; 72. horizontal plate; 73. tension plate; 74. bending spring; 75. reset spring; 8. rectangular slider; 9. rectangular slide groove. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it is necessary to understand that the terms "above", "below", "inside", "one end", "symmetrical", "vertical", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] Embodiment 1: This embodiment is used for PCD inserts that require only one fastening bolt for installation. Figures 1 to 8The present invention provides a PCD thread milling cutter with a positioning structure. The milling cutter bar 1 is cylindrical, one end of which is used for frame clamping, and the other end is provided with a mounting groove 11 for mounting a PCD blade 2. The side wall of the mounting groove 11 is a mounting reference surface, and the side wall of the PCD blade 2 is aligned with the mounting reference surface. A threaded hole 12 is provided on the mounting groove 11, and a mounting hole 21 is provided on the PCD blade 2. The mounting hole 21 is located above the threaded hole 12. When replacing and installing the PCD blade 2, the axis of the mounting hole 21 and the threaded hole 12 is aligned. The PCD insert 2 is fixed in the mounting groove 11, and a matching groove 13 is provided inside the milling cutter arbor 1. The matching groove 13 is located below the mounting groove 11, and the matching groove 13 passes through the bottom of the milling cutter arbor 1. A positioning component 4 is installed in the matching groove 13, and a positioning plate 44 is installed in the matching groove 13. The positioning component 4 is connected to the positioning plate 44. A pressing plate 5 is provided in the matching groove 13, and the bottom of the fastening bolt 3 contacts the surface of the pressing plate 5. The fastening bolt 3 is fastened. The bottom is in contact with the surface of the pressing plate 5. When the pressing plate 5 moves, the positioning assembly 4 is driven to work. The pressing plate 5 is located below the threaded hole 12. When the fastening bolt 3 passes through the mounting hole 21 and cooperates with the threaded hole 12, the fastening bolt 3 rotates downward continuously. The pressing plate 5 moves vertically downward under pressure. The pressing plate 5 moves while driving the positioning assembly 4. The positioning assembly 4 drives the positioning plate 44 so that the positioning plate 44 applies pressure toward the installation reference surface to the PCD blade 2. During the rotation of the fastening bolt 3, the side wall of the PCD blade 2 is fitted with the installation reference surface, so that when the operator replaces the blade of the thread milling cutter, the rotating fastening bolt 3 brings tilting forces in different directions, causing the blade to deviate from the installation position. Continuously adjusting the position of the PCD blade 2 will increase the installation time, and prevent the PCD blade 2 from deviating from the original installation position after being fixed on the milling cutter arbor 1 by the fastening bolt 3, thereby ensuring the cutting diameter of the thread milling cutter, avoiding the displacement of the blade during the cutting process of the thread milling cutter, ensuring the cutting quality of the thread milling cutter on the material, and improving the processing efficiency.The positioning assembly 4 includes a bottom plate 41, a movable frame 42, a T-shaped rod 43, and a vertical spring 45. The movable frame 42 is slidably mounted on the bottom plate 41. The movable frame 42 is set in a U shape. Two symmetrical inclined slide grooves 421 are provided on the movable frame 42. The two inclined slide grooves 421 pass through the two side walls of the movable frame 42. The T-shaped rod 43 is installed inside the movable frame 42, and the two ends of the T-shaped rod 43 pass through the two inclined slide grooves 421. The vertical spring 45 is fixedly mounted on the bottom plate 41. One end of the vertical spring 45 is fixedly connected to the bottom of the T-shaped rod 43. The positioning plate 44 is fixedly mounted on the side wall of the movable frame 42. The positioning plate 44 is set in an L shape. A positioning groove 14 is provided on the milling cutter bar 1. The positioning plate 44 is located in the positioning groove 14 and can be limitedly moved in the horizontal direction. A pressing groove 431 is opened on the T-shaped rod 43, and the pressing plate 5 is slidably installed on the pressing groove 431. A self-locking component 6 is installed on the mobile frame 42. The self-locking component 6 is used to limit the unidirectional movement of the mobile frame 42. The mobile frame 42 can be limitedly moved in the horizontal direction. The side walls of the U-shaped mobile frame 42 are set to be rectangular. The inclined slide groove 421 is a key groove shape. The connecting line of the two end points of the inclined slide groove 421 is parallel to the diagonal line of the side wall of the mobile frame 42. The inclined slide groove 421 is made of rubber material. The inclined slide groove 421 can be elastically deformed when squeezed. The two ends of the T-shaped rod 43 are set to be cylindrical, and The two ends are respectively located in two symmetrical inclined grooves 421. Under the thrust of the vertical spring 45, the T-shaped rod 43 is located at the upper end point inside the inclined groove 421. When the fastening bolt 3 rotates downward continuously, the pressing plate 5 is subjected to the pressure from the bottom of the fastening bolt 3, and the T-shaped rod 43 is also subjected to the same pressure. The T-shaped rod 43 moves vertically downward, and the T-shaped rod 43 slides relative to the inclined groove 421. The vertical spring 45 is compressed. Due to the restriction of the inclined groove 421, the T-shaped rod 43 slides relative to the inclined groove 421. The movable frame 42 will move in the horizontal direction at the same time. The locking assembly will limit the movable frame 42 from moving in one direction. At this time, the L-shaped positioning plate 4 When the PCD blade 2 is placed in the installation groove 11 as the moving frame 42 moves, the positioning groove 14 is obliquely below the PCD blade 2, and the positioning plate 44 moves in the positioning groove 14 toward the installation reference surface. The positioning plate 44 applies horizontal pressure to the side wall of the PCD blade 2, so that the other side wall of the PCD blade 2 is close to the installation reference surface, thereby preventing the PCD blade 2 from being subjected to tilting forces in different directions when the operator replaces the blade of the thread milling cutter, causing the PCD blade 2 to deviate from the original installation position, ensuring the cutting diameter of the thread milling cutter after the PCD blade 2 is installed, ensuring the cutting quality, and preventing the blade from shifting during the operation of the thread milling cutter, thereby increasing the service life of the thread milling cutter. ;

[0040] Reference Figures 3 to 8The self-locking assembly 6 includes a rectangular frame 61, a cam wedge 62, a reset spring 63, and a lever 64. Two rectangular frames 61 are symmetrically installed on the moving frame 42. The two rectangular frames 61 can slide in a limited position in the vertical direction. The cam wedge 62 is installed in the rectangular frame 61. The top tangent of the cam wedge 62 is in the same horizontal plane as the top of the moving frame 42. The diagonal diameter of one side of the cam wedge 62 is larger than the diagonal diameter of the other side. The reset spring 63 passes through the middle of the cam wedge 62. The two ends of the reset spring 63 are fixed on the inner wall of the rectangular block. The reset spring 63 makes The center line of the cam wedge 62 is kept horizontal, and the lever 64 is rotatably installed on the inner wall of the moving frame 42. One end of the lever 64 is rotatably connected to the rectangular frame 61, and the other end is located in the pressing groove 431. When the bolt is rotated and tightened, the lever 64 is pressed to rotate, so that the rectangular frame 61 moves in a limited position in the vertical direction. A tension component 7 is provided on the bottom plate 41, and the tension component 7 can apply a downward oblique tension to the PCD blade 2. The rectangular frame 61 is embedded and slidably installed on the inner wall of the moving frame 42. The rectangular frame 61 can only slide in a limited position in the vertical direction and cannot slide in the horizontal direction. When the fastening bolt 3 has not yet applied pressure to the pressing plate 5, the top tangent of the cam wedge 62 is in the same horizontal plane as the top of the moving frame 42, and the top of the cam wedge 62 is tangent to the upper inner wall of the matching groove 13. The end of the lever 64 located in the pressing groove 431 is set as a bent elastic metal. When the fastening bolt 3 rotates downward to apply pressure to the pressing plate 5, the end of the lever 64 in the pressing groove 431 will be pressed down by the fastening bolt 3, and the lever 64 will rotate with the connection point of the moving frame 42 as the rotation point. The rotation of the lever 64 will drive the rectangular frame 61 moves upward, at which time the top of the cam wedge 62 will fit with the inner wall of the matching groove 13. Since the diagonal diameter of one side of the cam wedge 62 is larger than the diagonal diameter of the other side, under the elastic force of the reset spring 63, the mobile frame 42 can only move in one direction in the horizontal direction. The friction between the cam wedge 62 and the inner wall of the matching groove 13 self-locks the mobile frame 42, preventing the reaction force of the vertical spring 45 from causing the mobile frame 42 to retreat during the rotation of the fastening bolt 3, resulting in the positioning plate 44 being unable to work normally, thereby improving the stability of the positioning assembly 4;The tension assembly 7 includes a vertical slide rail 71, a horizontal plate 72, a tension plate 73, and a bending spring 74. Two vertical slide rails 71 are symmetrically fixedly installed on the bottom plate 41. The horizontal plate 72 is slidably installed on the vertical slide rail 71. One end of the horizontal plate 72 is located below the pressing plate 5. The tension plate 73 is rotatably installed on the horizontal plate 72. The tension plate 73 is set in a J shape. The tension plate 73 is set in an upper and lower segmented type. The two ends of the bending spring 74 are respectively connected to the horizontal plate 72 and the tension plate 73. A rectangular groove 15 is opened on the milling cutter rod 1. The rectangular groove 15 is located above the tension plate 73. A tensioning groove 22 is opened on the PCD blade 2. The tension plate 73 passes through the rectangular groove 15 and is engaged with the tensioning groove 22. When the fastening bolt 3 has not yet applied pressure to the pressing plate 5, the tension plate 73 is vertically located in the matching groove 13 and passes through the rectangular groove 15 under the thrust of the bending spring 74. When the fastening bolt 3 rotates downward to apply pressure to the pressing plate 5, the pressing plate 5 moves downward and drives the horizontal plate 72 to move downward. At this time, the bending spring 74 is stretched, and the tension plate 73 rotates slightly. During the continuous downward movement of the horizontal plate 72, the two-stage tension plate 73 gradually extends, and the end of the tension plate 73 is engaged with the tightening groove 22. The tension plate 73 applies an inclined downward tension to the PCD blade 2, so that the PCD blade 2 is more closely fitted with the bottom surface of the mounting groove 11 and the mounting reference surface, further improving the positioning component 4. The fixing effect can prevent the PCD blade 2 from deviating from the original installation position, thereby improving the installation efficiency and the workpiece processing efficiency; a return spring 75 is fixedly installed under the horizontal plate 72, and the other end of the return spring 75 is fixedly connected to the bottom plate 41. When the fastening bolt 3 is tightened downward, the return spring 75 is compressed. When the fastening bolt 3 is taken out from the milling cutter arbor 1, the thrust of the return spring 75 causes the horizontal plate 72 to move vertically upward, and the end of the horizontal plate 72 slides relative to the vertical guide rail. At the same time, under the thrust of the bending spring 74, the tension plate 73 is shortened and restored to a vertical state, and the end of the tension plate 73 leaves the tightening groove 22. The linkage between the fastening bolt 3 and the return spring 75 facilitates the release of the tension plate 73 from the PCD The pulling force of the blade 2 improves the disassembly and assembly efficiency of the PCD blade 2; the positioning component 4, the self-locking component 6 and the pulling component 7 are integrally fixedly installed on the bottom plate 41, and the bottom plate 41 passes through the bottom of the milling cutter rod 1 and is fixedly installed inside the matching groove 13. The overall structure can be modularly installed into the milling cutter rod 1, which is convenient for production and processing and reduces the production cost of the equipment; two rectangular sliders 8 are symmetrically fixedly installed on the bottom plate 41, and two corresponding rectangular slide grooves 9 are opened in the matching groove 13. The rectangular sliders 8 and the rectangular slide grooves 9 are slidably matched. When the bottom plate 41 is installed into the matching groove 13, the rectangular slide grooves 9 play a positioning and guiding role, and also facilitate the matching connection between the bottom plate 41 and the matching groove 13. ;

[0041] Working principle: when replacing the blade of the thread milling cutter, first align the mounting hole 21 of the PCD blade 2 with the threaded hole 12, and then pass the fastening bolt 3 through the mounting hole 21 and rotate it to match the threaded hole 12. When the fastening bolt 3 is continuously rotated downward, the pressing plate 5 is subjected to the pressure from the bottom of the fastening bolt 3, and the T-shaped rod 43 is also subjected to the same pressure. The T-shaped rod 43 moves vertically downward, and the T-shaped rod 43 slides relative to the inclined slide groove 421. The vertical spring 45 is compressed. Due to the restriction of the inclined slide groove 421, the T-shaped rod 43 slides relative to the inclined slide groove 421. The movable frame 42 will move in the horizontal direction at the same time. At this time, the L-shaped positioning plate 44 moves with the movable frame 42, and the positioning groove 14 is obliquely below the PCD blade 2. The positioning plate 44 moves in the positioning groove 14 toward the direction of the installation reference surface, and the positioning plate 44 applies horizontal pressure to the side wall of the PCD blade 2, so that the other side wall of the PCD blade 2 is close to the installation reference surface and is in the pressing groove 4 The end of the lever 64 in 31 will be pressed down by the fastening bolt 3, and the lever 64 will rotate with the connection point of the movable frame 42 as the rotation point. The rotation of the lever 64 will drive the rectangular frame 61 to move upward. At this time, the top of the cam wedge block 62 will fit with the inner wall of the matching groove 13. Since the diagonal diameter of one side of the cam wedge block 62 is larger than the diagonal diameter of the other side, under the elastic force of the reset spring 63, the movable frame 42 can only move in one direction in the horizontal direction. The friction force between the cam wedge block 62 and the inner wall of the matching groove 13 self-locks the movable frame 42, and the pressing plate 5 moves downward while driving the horizontal plate 72 to move downward. At this time, the bending spring 74 is stretched, and the tension plate 73 rotates slightly. During the continuous downward movement of the horizontal plate 72, the two-stage tension plate 73 gradually extends, and the end of the tension plate 73 is engaged with the tightening groove 22. The tension plate 73 applies an inclined downward tension to the PCD blade 2, so that the PCD blade 2 is more closely fitted with the bottom surface of the mounting groove 11 and the mounting reference surface.

[0042] Example 2, refer to Figure 6 , Fig. 9 The difference between this embodiment and the first embodiment is that the lengths of both ends of the T-shaped rod 43 are extended to below the multiple threaded holes 12 , and the T-shaped rod 43 is located in the connecting groove 51 .

[0043] Working principle: When the PCD blade 2 needs to be connected with multiple fastening bolts 3, when the fastening bolts 3 at any position are tightened downward, the T-shaped rod 43 can be pressed to make the T-shaped rod 43 move vertically downward, and the T-shaped rod 43 in the connecting groove 51 drives the horizontal plate 72 to move, so that the tension plate 73 applies an oblique downward tension to the PCD blade 2. When the T-shaped rod 43 slides relative to the inclined slide groove 421, the moving frame 42 will move in the horizontal direction at the same time, driving the positioning plate 44 to apply pressure to the side wall of the PCD blade 2, so that the other side wall of the PCD blade 2 fits with the positioning reference surface.

[0044] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A PCD thread milling cutter with a positioning structure, characterized in that: The invention comprises a milling cutter shank (1), a PCD blade (2), a fastening bolt (3), and a positioning assembly (4); the end of the milling cutter shank (1) is provided with a mounting groove (11); the side wall of the mounting groove (11) is a mounting reference surface; a threaded hole (12) is provided on the mounting groove (11); the PCD blade (2) is installed in the mounting groove (11), and the side edge is flush with the mounting reference surface; the PCD blade (2) is provided with a mounting hole (21); the fastening bolt (3) passes through the mounting hole (21) and is fastened to the threaded hole (12), thereby fixing the PCD blade (2) in the mounting groove. (11), a matching groove (13) is provided inside the milling cutter shank (1), the matching groove (13) passes through the bottom of the milling cutter shank (1), the positioning component (4) is installed in the matching groove (13), a positioning plate (44) is installed in the matching groove (13), the positioning component (4) is connected to the positioning plate (44), a pressing plate (5) is arranged in the matching groove (13), the bottom of the fastening bolt (3) is in contact with the surface of the pressing plate (5), and the pressing plate (5) drives the positioning component (4) to make the positioning plate (44) fit the side wall of the PCD blade (2) with the installation reference surface.

2. A PCD thread milling cutter with a positioning structure according to claim 1, characterized in that: The positioning assembly (4) comprises a bottom plate (41), a movable frame (42), a T-shaped rod (43), and a vertical spring (45). The bottom plate (41) is installed in the matching groove (13). The movable frame (42) is slidably installed on the bottom plate (41). The movable frame (42) is set in a U shape. Two symmetrical inclined sliding grooves (421) are provided on the movable frame (42). The two inclined sliding grooves (421) penetrate the two side walls of the movable frame (42). The two inclined sliding grooves (421) are made of rubber material. The T-shaped rod (43) is installed inside the movable frame (42), and the two ends of the T-shaped rod (43) pass through the two inclined sliding grooves (421). The vertical spring (45) is fixedly installed on the bottom plate (41). 1), one end of the vertical spring (45) is fixedly connected to the bottom of the T-shaped rod (43), the positioning plate (44) is fixedly installed on the side wall of the movable frame (42), the positioning plate (44) is set in an L shape, the milling cutter rod (1) is provided with a positioning groove (14), the positioning plate (44) is located in the positioning groove (14) and can be limitedly moved in the horizontal direction, the positioning plate (44) is slidably fitted with a side wall of the PCD blade (2), the T-shaped rod (43) is provided with a pressing groove (431), the pressing plate (5) is slidably installed on the pressing groove (431), and a self-locking component (6) is installed on the movable frame (42), and the self-locking component (6) is used to limit the unidirectional movement of the movable frame (42).

3. The PCD thread milling cutter with a positioning structure according to claim 2, characterized in that: The self-locking component (6) comprises a rectangular frame (61), a cam wedge (62), a reset spring (63), and a lever (64). Two rectangular frames (61) are symmetrically mounted on the moving frame (42). The two rectangular frames (61) can slide in a limited position in a vertical direction. The cam wedge (62) is mounted in the rectangular frame (61). The top tangent of the cam wedge (62) and the top of the moving frame (42) are in the same horizontal plane. The diagonal diameter of one side of the cam wedge (62) is larger than the diagonal diameter of the other side. The reset spring (63) passes through the middle of the cam wedge (62), and the two ends of the reset spring (63) are fixed on the inner wall of the rectangular block. The reset spring (63) keeps the center line of the cam wedge (62) horizontal. The lever (64) is rotatably mounted on the inner wall of the movable frame (42). One end of the lever (64) is rotatably connected to the rectangular frame (61), and the other end is located in the pressing groove (431). When the bolt is rotated and tightened, the lever (64) is pressed to rotate, so that the rectangular frame (61) moves in a limited position in the vertical direction.

4. The PCD thread milling cutter with a positioning structure according to claim 2, characterized in that: The base plate (41) can be detachably mounted inside the matching groove (13) by passing through the bottom of the milling cutter rod (1); a tension component (7) is arranged on the base plate (41); and the tension component (7) can apply an oblique downward tension to the PCD blade (2).

5. The PCD thread milling cutter with a positioning structure according to claim 4, characterized in that: The tension assembly (7) comprises a vertical slide rail (71), a horizontal plate (72), a tension plate (73), and a bending spring (74). Two vertical slide rails (71) are symmetrically fixedly installed on the bottom plate (41). The horizontal plate (72) is slidably installed on the vertical slide rail (71). One end of the horizontal plate (72) is located below the pressing plate (5). The tension plate (73) is rotatably installed on the horizontal plate (72). The tension plate (73) is set in a J shape. The tension plate (73) is set in an upper and lower segmented type. The two ends of the bending spring (74) are respectively connected to the horizontal plate (72) and the tension plate (73). A rectangular groove (15) is provided on the milling cutter rod (1). The rectangular groove (15) is located above the tension plate (73). A tensioning groove (22) is provided on the PCD blade (2). The tension plate (73) passes through the rectangular groove (15) and is engaged with the tensioning groove (22).

6. The PCD thread milling cutter with a positioning structure according to claim 5, characterized in that: A return spring (75) is fixedly installed below the horizontal plate (72), and the other end of the return spring (75) is fixedly connected to the bottom plate (41).

7. The PCD thread milling cutter with a positioning structure according to claim 2, characterized in that: A plurality of threaded holes (12) are provided in the installation groove (11), the T-shaped rod (43) extends to both sides below the plurality of threaded holes (12), a connecting groove (51) is provided on the pressing plate (5), and the T-shaped rod (43) is clamped inside the connecting groove (51).

8. The PCD thread milling cutter with a positioning structure according to claim 4, characterized in that: Two rectangular sliding blocks (8) are symmetrically fixedly mounted on the bottom plate (41), two corresponding rectangular sliding grooves (9) are opened in the matching groove (13), and the rectangular sliding blocks (8) are slidably matched with the rectangular sliding grooves (9).

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