A measuring device and a measuring method for multiple key angles of a twist drill

Abstract

This invention discloses a measuring device and method for measuring multiple key angles of a twist drill. The device includes a base, a drill bit rotation mechanism, an angle measuring mechanism, and an angle display mechanism. The angle measuring mechanism adjusts the position and angle of the measuring plate relative to the twist drill through a sliding mechanism, a keyhole sleeve, an angle measuring block, and a rotating sleeve, and works with a movable alignment component to locate the point to be measured. The drill bit rotation mechanism drives the twist drill to rotate through a tool holder sleeve. A first angle encoder, a second angle encoder, and a third angle encoder respectively acquire the rotation angle of their respective components and transmit it to the angle display. This invention can accurately measure the chisel edge angle, apex angle, front angle, back angle, and helix angle of a twist drill, and has the advantages of flexible adjustment, high integration, and convenient measurement, thus improving the machining accuracy of twist drills.

Description

Technical Field

[0001] This invention relates to an angle measuring device, specifically to a measuring device and method for measuring multiple key angles of a twist drill. Background Technology

[0002] Twist drills are the most widely used hole-making tools in the machining field. Their key angular parameters, such as the point angle, helix angle, and chisel edge angle, directly determine drilling accuracy, machining efficiency, and tool life. In high-end manufacturing scenarios such as aerospace, automotive manufacturing, and precision machinery, deviations in angular parameters can easily lead to problems such as out-of-tolerance hole diameter, rough hole walls, and accelerated tool wear. Therefore, accurate measurement of angular parameters is a core element in ensuring machining quality.

[0003] Currently, the commonly used measurement methods in the industry include traditional universal angle gauge measurement and precision optical instrument measurement. Traditional angle gauge measurement relies on manual operation experience, which not only results in large measurement errors but also makes it impossible to quickly obtain multi-dimensional angle data. Although precision optical instruments offer high measurement accuracy, they are expensive, complex to operate, and lack portability, failing to meet the needs of on-site, real-time inspection in workshops.

[0004] Therefore, there is an urgent need for a simple, convenient, and cost-effective measuring device to accurately measure multiple key angles of twist drills. Summary of the Invention

[0005] To address the aforementioned deficiencies in existing technologies, a measuring device and method for measuring multiple key angles of twist drills are provided. This device can accurately measure the helix angle, chisel edge angle, apex angle, rake angle, and clearance angle of twist drills, thereby improving the machining accuracy of twist drills.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A measuring device for multiple key angles of a twist drill includes a base, a drill bit rotation mechanism, an angle measuring mechanism, and an angle display mechanism; The angle measuring mechanism includes a column, a keyhole sleeve, an angle measuring block, a rotating sleeve, and a measuring plate. The column is mounted on a base via a sliding mechanism and is equipped with a fixing component. The keyhole sleeve is configured to slide up and down on the column and is equipped with an adjusting component. The angle measuring block is rotatably mounted on the keyhole sleeve. The rotating sleeve is rotatably connected to the angle measuring block via a positioning shaft. The angle measuring block is provided with a first locking component for locking the angle measuring block and a second locking component for locking the rotating sleeve. The measuring plate is mounted on the rotating sleeve and is provided with a cross-shaped reference groove and an alignment component. The alignment component is configured to move laterally along the measuring plate. The drill bit rotating mechanism includes a support platform on the base, a tool holder sleeve rotatably inserted in the support platform, and a third locking member for locking the tool holder sleeve. The front end of the tool holder sleeve is used to fix the twist drill, and the front end of the twist drill faces the measuring plate. The angle display mechanism includes a first angle encoder mounted on a column for detecting the rotation angle of the angle measuring block, a second angle encoder mounted on a positioning shaft for detecting the rotation angle of the rotating sleeve, a third angle encoder mounted on the tool holder sleeve for detecting the rotation angle of the tool holder sleeve, and an angle display mounted on a base. The angle display is electrically connected to the first angle encoder, the second angle encoder, and the third angle encoder.

[0007] According to the above technical solution, the base is also provided with a rolling groove, the rolling groove is provided with a first slide rail, a baffle is slidably arranged on the first slide rail, and the baffle is provided with fasteners for locking it on the first slide rail.

[0008] According to the above technical solution, the first locking member is threadedly connected to the angle measuring block. Tightening the first locking member causes its front end to abut against the keyhole sleeve, thereby locking the position of the angle measuring block. The rotating sleeve is fixedly connected to the positioning shaft. The second locking member is threadedly connected to the angle measuring block. Tightening the second locking member causes its front end to abut against the positioning shaft, thereby locking the position of the rotating sleeve. The third locking member is threadedly connected to the support table. Tightening the third locking member causes its front end to abut against the tool holder sleeve, thereby locking the position of the tool holder sleeve.

[0009] According to the above technical solution, the surface of the column is provided with a vertical anti-rotation groove, and the keyhole sleeve is provided with an anti-rotation strip that cooperates with the anti-rotation groove on the inner wall.

[0010] According to the above technical solution, the keyhole sleeve and the angle measuring block are respectively provided with a first angle scale and a first reference line for calculating the rotation angle of the angle measuring block relative to the keyhole sleeve; the angle measuring block and the rotating sleeve are respectively provided with a second angle scale and a second reference line for calculating the rotation angle of the rotating sleeve relative to the angle measuring block; the tool holder sleeve and the support platform are respectively provided with a third angle scale and a third reference line for calculating the rotation angle of the tool holder sleeve relative to the support platform.

[0011] According to the above technical solution, the measuring plate is provided with a transverse track, the alignment member is slidably disposed in the track and fixed by hand-tightening screws.

[0012] According to the above technical solution, the outer circumferential surface of the tool holder sleeve is provided with an annular groove, which is adapted to the third locking member, so that the third locking member is inserted after being tightened and abuts against the bottom of the annular groove.

[0013] According to the above technical solution, the sliding mechanism includes a second slide rail fixedly installed on the base and a slider slidably disposed in the second slide rail, and the column is fixedly connected to the slider.

[0014] According to the above technical solution, the fixing component includes a locking nut that is threaded onto the column, and the locking nut is adjacent to the upper surface of the second slide rail; the adjusting component includes an adjusting nut that is threaded onto the column, and the bottom of the keyhole sleeve is provided with a flange, and the adjusting nut is adjacent to the lower surface of the flange.

[0015] The present invention also provides a method for measuring multiple key angles of a twist drill, based on the above-mentioned measuring device for multiple key angles of a twist drill, the method comprising the following steps: When the sliding mechanism is activated, the angle measuring mechanism moves along the sliding mechanism to adjust the distance between the measuring plate and the twist drill; when the adjusting component is activated, the keyhole sleeve moves up and down along the column to adjust the height of the measuring plate to match the twist drill. Chisel edge angle measurement: The tool holder sleeve is rotated so that the chisel edge of the twist drill is aligned with the transverse groove of the cross reference groove on the measuring plate; after the third angle encoder is activated, the tool holder sleeve continues to rotate until the main cutting edge of the twist drill is aligned with the transverse groove of the cross reference groove. The rotation angle of the tool holder sleeve is synchronously acquired and transmitted to the angle display, which is the chisel edge angle of the twist drill. Point angle measurement: The tool holder sleeve is rotated so that the transverse cutting edge of the twist drill is aligned with the longitudinal groove of the cross reference groove on the measuring plate; after the first angle encoder is activated, the angle measuring block is rotated so that the measuring plate is in contact with the main cutting edges on both sides of the twist drill respectively. The rotation angle of the measuring plate corresponding to the main cutting edges on both sides is synchronously collected and transmitted to the angle display, recorded as η1 and η2. The point angle of the twist drill is 180°-η1-η2. Rake angle measurement: The tool holder sleeve is rotated so that the transverse cutting edge of the twist drill is aligned with the transverse groove of the cross reference groove on the measuring plate; after the second angle encoder is activated, the rotating sleeve is rotated to adjust the position of the alignment part so that the vertex of the alignment part is in contact with the point to be measured on the rake face of the twist drill. The rotation angle of the rotating sleeve is synchronously acquired and transmitted to the angle display, and recorded as b. The rake angle of the twist drill is 90°-b. Back angle measurement: The tool holder sleeve is rotated so that the cross edge of the twist drill is aligned with the longitudinal groove of the cross reference groove on the measuring plate; after the first angle encoder is activated, the angle measuring block is rotated so that the measuring plate is tangent to the back face of the tool at the point to be measured. The rotation angle of the angle measuring block is synchronously acquired and transmitted to the angle display, which is the back angle of the twist drill. Helix angle measurement: After the repeater paper is placed in the rolling groove, the twist drill is placed horizontally on the repeater paper. The baffle is moved and fixed to contact the top of the twist drill. The rolling twist drill leaves an oblique line on the repeater paper. The angle between the oblique line and the axis of the twist drill is measured, which is the helix angle of the twist drill.

[0016] The present invention has the following beneficial effects: (1) The present invention adjusts the distance between the measuring plate and the twist drill through a sliding mechanism, adjusts the height of the measuring plate by moving the keyhole sleeve up and down along the column, and moves the alignment piece laterally along the measuring plate to align with the point to be measured on the twist drill, so that the measuring plate and the twist drill have multiple degrees of freedom for position adjustment; the present invention drives the twist drill to rotate through the tool holder sleeve, and drives the measuring plate to rotate through the angle measuring block and the rotating sleeve, so that the measuring plate and the twist drill have multiple degrees of freedom for angle adjustment, thereby enabling the relative position and relative posture of the measuring plate and the twist drill to be flexibly adjusted according to the size of the twist drill, the type of angle to be measured and the position of the point to be measured, so as to achieve accurate measurement of the chisel edge angle, apex angle, front angle and back angle of the twist drill, without the need to configure measuring tools separately for different angles, thus improving the integration and adaptability of multi-angle measurement of twist drill.

[0017] (2) The present invention obtains the rotation angles corresponding to the angle measuring block, the rotating sleeve and the tool holder sleeve by means of the first angle encoder, the second angle encoder and the third angle encoder respectively, and transmits the measurement data to the angle display for display, thereby reducing the error caused by manual reading of mechanical scale and improving the convenience and accuracy of angle measurement.

[0018] (3) The present invention has a rolling groove on the base, so that the twist drill can roll on the copy paper laid in the rolling groove and leave a track. When the baffle moves to contact the top of the twist drill, it is fixed, which can prevent the twist drill from deviating during the rolling process, improve the stability of the track and the accuracy of the helix angle measurement.

[0019] (4) The present invention has an annular groove on the outer circumferential surface of the tool holder sleeve. The annular groove is adapted to the third locking member. After the third locking member is tightened, it can be inserted into the annular groove and abut against the bottom of the annular groove, which can both restrict the tool holder sleeve from continuing to rotate and restrict the tool holder sleeve from sliding along its axial direction.

[0020] (5) The present invention has mutually cooperating angle scales and reference lines between the keyhole sleeve and the angle measuring block, the angle measuring block and the rotating sleeve, and the tool holder sleeve and the support table. This allows for initial position calibration of each rotating component before measurement and verification of the measurement results based on the readings. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of the measuring device provided in an embodiment of the present invention; Figure 2 A partial exploded view of the measuring device provided for an embodiment of the present invention; Figure 3 A schematic diagram of the measuring plate and alignment member provided for an embodiment of the present invention; Figure 4 A schematic diagram of the column structure is provided for an embodiment of the present invention; Figure 5 A schematic diagram of the keyhole sleeve structure is provided for an embodiment of the present invention; Figure 6 A schematic diagram of the angle measuring block structure is provided for an embodiment of the present invention; Figure 7 A schematic diagram of the rotating sleeve structure is provided for an embodiment of the present invention; Figure 8 A schematic diagram of the tool holder sleeve structure is provided for an embodiment of the present invention; Figure 9 A schematic diagram of the cross-blade bevel angle measurement is provided for an embodiment of the present invention; Figure 10 A schematic diagram of apex angle measurement is provided for an embodiment of the present invention; Figure 11 A schematic diagram of front angle measurement is provided for an embodiment of the present invention; Figure 12 A schematic diagram of the rear angle measurement according to an embodiment of the present invention is provided; Figure 13 A schematic diagram illustrating the measurement of the helix angle in an embodiment of the present invention.

[0022] In the diagram: 1. Base; 101. Rolling groove; 102. First slide rail; 103. Baffle; 104. Fastening bolt; 105. Second slide rail; 106. Slider; 2. Angle measuring mechanism; 21. Column; 211. Anti-rotation groove; 212. Locking nut; 213. Adjusting nut; 22. Keyhole sleeve; 221. Anti-rotation strip; 222. Flange; 223. First angle scale; 23. Angle measuring block; 231. First locking screw; 232. Second locking screw; 233. First reference line; 234. Second angle scale; 24. Rotating sleeve; 241. Positioning shaft; 242. Second reference line; 25. Measuring plate; 251. Cross reference groove; 252. Alignment component; 2521. Vertex of alignment component; 253. Track; 254. Hand screw; 3. Drill bit rotation mechanism; 31. Support platform; 311. Third reference line; 32. Tool holder sleeve; 321. Third locking screw; 322. Tapered sleeve; 323. Third angle scale; 324. Annular groove; 325. Knob; 41. First angle encoder; 42. Second angle encoder; 43. Third angle encoder; 44. Angle display; 45. Button; 5. Twist drill; 51. Chisel edge; 52. Main cutting edge; 53. Rake face; 54. Flank face; 6. Spiral development line. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Reference Figures 1-13 As shown, the present invention provides a measuring device and method for measuring multiple key angles of a twist drill.

[0025] Example 1 like Figure 1 and Figure 2 As shown, a measuring device for multiple key angles of a twist drill 5 is provided, including a base 1, a drill bit rotation mechanism 3, an angle measuring mechanism 2, and an angle display mechanism; The angle measuring mechanism 2 includes a column 21, a keyhole sleeve 22, an angle measuring block 23, a rotating sleeve 24, and a measuring plate 25. The column 21 is mounted on the base 1 via a sliding mechanism and is equipped with a fixing component. The keyhole sleeve 22 is configured to slide up and down on the column 21 and is equipped with an adjusting component. The angle measuring block 23 is rotatably mounted on the keyhole sleeve 22. The rotating sleeve 24 is rotatably connected to the angle measuring block 23 via a positioning shaft 241. The angle measuring block 23 is provided with a first locking component for locking the angle measuring block 23 and a second locking component for locking the rotating sleeve 24. The measuring plate 25 is mounted on the rotating sleeve 24. The measuring plate 25 is provided with a cross reference groove 251 and an alignment component 252. The alignment component 252 is configured to move laterally along the measuring plate 25. The drill bit rotation mechanism 3 includes a support platform 31 on the base 1, a tool holder sleeve 32 rotatably inserted in the support platform 31, and a third locking member for locking the tool holder sleeve 32. The front end of the tool holder sleeve 32 is used to fix the twist drill 5, and the front end of the twist drill 5 faces the measuring plate 25. The angle display mechanism includes a first angle encoder 41 mounted on the column 21 for detecting the rotation angle of the angle measuring block 23, a second angle encoder 42 mounted on the positioning shaft 241 for detecting the rotation angle of the rotating sleeve 24, a third angle encoder 43 mounted on the tool holder sleeve 32 for detecting the rotation angle of the tool holder sleeve 32, and an angle display 44 mounted on the base 1. The angle display 44 is electrically connected to the first angle encoder 41, the second angle encoder 42, and the third angle encoder 43.

[0026] Furthermore, such as Figure 3As shown, the measuring plate 25 is fixed to the rotating sleeve 24 by bolts. The measuring plate 25 is provided with a cross reference groove 251 and an alignment member 252. The cross reference groove 251 includes a horizontal groove and at least one vertical groove. A transverse track 253 is provided on the measuring plate 25. The track 253 is a combined track 253, which is composed of a wide track 253 that is wider near the front of the measuring plate 25 and a narrow track 253 that is narrower near the back of the measuring plate 25. The alignment member 252 is slidably disposed in the wide track 253. The alignment member 252 is provided with a apex hand that protrudes from the front of the measuring plate 25. The screw passes through the narrow track 253 from the back of the measuring plate 25 and is threadedly connected to the alignment member 252. After tightening the hand screw 254, the hand screw 254 and the alignment member 252 clamp the narrow track 253, thereby fixing the locking member.

[0027] Furthermore, the sliding mechanism includes a second slide rail 105 and a slider 106. The second slide rail 105 is fixedly installed on the base 1, and the direction of the second slide rail 105 is consistent with the direction of the fixed twist drill 5. The slider 106 is slidably disposed in the second track 253, and the column 21 is fixedly connected to the slider 106.

[0028] Furthermore, such as Figure 4 and Figure 5 As shown, the keyhole sleeve 22 has an outwardly protruding flange 222 at its bottom. The angle measuring block 23 is fitted onto the keyhole sleeve 22 and abuts against the flange 222 under the action of gravity. The keyhole sleeve 22 drives the angle measuring block 23 to move up and down through the flange 222. The surface of the column 21 has a vertical anti-rotation groove 211. The keyhole sleeve 22 has an anti-rotation strip 221 on its inner wall that cooperates with the anti-rotation groove 211, so that the keyhole sleeve 22 can only move up and down along the column 21 and cannot rotate, thus avoiding affecting the angle measurement.

[0029] Furthermore, the surface of the column 21 is provided with threads, which can be segmented or continuous. The fixing component is preferably a locking nut 212, which is threaded onto the column 21 and adjacent to the upper surface of the second track 253, thus fixing the column 21. The adjusting component is preferably an adjusting nut 213, which is threaded onto the column 21 and adjacent to the lower surface of the flange 222. The adjusting nut 213 adjusts the position of the keyhole sleeve 22, thereby adjusting the height of the measuring plate 25.

[0030] Furthermore, such as Figure 6 and Figure 7As shown, the rotating sleeve 24 has two opposing clamping parts, which clamp onto both sides of the keyhole sleeve 22. The positioning shaft 241 passes through the rotating sleeve 24 and the keyhole sleeve 22 respectively. The rotating sleeve 24 is fixedly connected to the positioning shaft 241, and both ends of the positioning shaft 241 are fixed to the two clamping parts by two bolts respectively. The upper and lower ends of the measuring plate 25 are fixedly connected to the rotating sleeve 24 by two bolts to ensure the stability of the measuring plate 25.

[0031] Furthermore, the first locking component is preferably a first locking screw 231, which is threadedly connected to the angle measuring block 23. After tightening the first locking screw 231, its front end abuts against the keyhole sleeve 22, thereby locking the position of the angle measuring block 23 through friction and preventing the angle measuring block 23 from rotating relative to the keyhole sleeve 22. The second locking component is preferably a second locking screw 232, which is threadedly connected to the angle measuring block 23. After tightening the second locking screw 232, its front end abuts against the rotating shaft, thereby locking the position of the rotating sleeve 24 through friction and preventing the rotating sleeve 24 from rotating relative to the angle measuring block 23. The third locking component is preferably a third locking screw 321. The third locking screw 321 is connected to the support platform 31 by a thread. After tightening the third locking screw 321, the front end of the third locking screw 321 abuts against the tool holder sleeve 32. The tool holder sleeve 32 is locked in position by friction, preventing the tool holder sleeve 32 from rotating relative to the support platform 31.

[0032] Furthermore, such as Figure 8 As shown, a knob 325 is provided at the rear end of the tool holder sleeve 32, which allows the tool holder sleeve 32 to be rotated easily. An annular groove 324 is provided on the outer circumferential surface of the tool holder sleeve 32. The size and position of the annular groove 324 are adapted to the third locking screw 321. After tightening the third locking screw 321, the front end of the third locking screw 321 is inserted into the annular groove 324 and abuts against the bottom of the annular groove 324, which can both restrict the rotation of the tool holder sleeve 32 relative to the support platform 31 and restrict the sliding of the tool holder sleeve 32 along its axial direction.

[0033] Furthermore, a tapered sleeve 322 is fixedly connected to the front end of the tool holder sleeve 32 by a thread, and a twist drill 5 is inserted into the hole of the tapered sleeve 322. The twist drill 5 and the tapered sleeve 322 are wedged together by the Morse taper.

[0034] Furthermore, the first angle encoder 41 is mounted on the top of the column 21 and is coaxially arranged with the column 21. The rotating shaft of the first angle encoder 41 is fixedly connected to the column 21, and the outer shell is fixedly connected to the angle measuring block 23 through a telescopic rod, so that the outer shell can adapt to the height change of the angle measuring block 23. The rotating shaft of the first angle encoder 41 remains stationary, and the outer shell rotates synchronously with the angle measuring block 23. The angular displacement relative to the rotating shaft is the rotation angle of the angle measuring block 23. The second angle encoder 42 is mounted on the positioning shaft 241 and is coaxially arranged with the positioning shaft 241. The rotating shaft of the second angle encoder 42 is fixedly connected to the column 21, and the outer shell remains stationary. The rotating shaft rotates synchronously with the rotating sleeve 24, and the angular displacement relative to the outer shell is the rotation angle of the rotating sleeve 24. The third angle encoder 43 is mounted on the knob 325 of the tool holder sleeve 32 and is coaxially set with the rotation shaft of the tool holder sleeve 32. The rotation shaft of the third angle encoder 43 is fixedly connected to the tool holder sleeve 32, while the outer shell remains stationary. The rotation shaft rotates synchronously with the tool holder sleeve 32, and the angular displacement relative to the outer shell is the rotation angle of the tool holder sleeve 32.

[0035] Furthermore, the angle display 44 is used to display the data measured by the three angle encoders. The angle display 44 is equipped with three buttons 45, which correspond to the three angle encoders respectively. When the button 45 is pressed, the readings of the three angle encoders are displayed respectively.

[0036] Furthermore, the keyhole sleeve 22 and the angle measuring block 23 are respectively provided with a first angle scale 223 and a first reference line 233, for manually reading and calculating the rotation angle of the angle measuring block 23 relative to the keyhole sleeve 22; the angle measuring block 23 and the rotating sleeve 24 are respectively provided with a second angle scale 234 and a second reference line 242, for manually reading and calculating the rotation angle of the rotating sleeve 24 relative to the angle measuring block 23; the tool holder sleeve 32 and the support platform 31 are respectively provided with a third angle scale 323 and a third reference line 311, for manually reading and calculating the rotation angle of the tool holder sleeve 32 relative to the support platform 31. Before measurement, each reference line is aligned with the 0 mark line of the corresponding angle scale to perform initial position calibration of each rotating component. The manually read angle value is compared with the angle value measured by the angle encoder. When the error is large, it indicates that there is an error, and the measuring device is calibrated to improve the accuracy of the measurement results.

[0037] Example 2 The principle and technical solution of Embodiment 2 are basically the same as those of Embodiment 1, except that the measuring device integrates the function of measuring the helix angle of the twist drill.

[0038] Furthermore, such as Figure 1As shown, a rolling groove 101 is provided on the base 1. The rolling groove 101 is a wide groove with a horizontal bottom. Two parallel first slide rails 102 are provided on both sides of the rolling groove 101. A baffle 103 is provided on the first slide rail 102. The two ends of the baffle 103 are slidably connected to the two first slide rails 102 respectively, so that the baffle 103 can slide along the direction of the first slide rail 102. Fasteners are threaded to both ends of the baffle 103. The fasteners are preferably fastening bolts 104. After the fastening bolts 104 are tightened, the front end of the fastening bolt 104 abuts against the bottom of the first slide rail 102, thereby locking the baffle 103.

[0039] Example 3 Example 3 provides a method for measuring multiple key angles of a twist drill 5. This method is based on the aforementioned measuring device for multiple key angles of a twist drill 5 and includes the following steps: The measuring plate 25 and the twist drill 5 have multiple degrees of freedom for position and angle adjustment. The measurement of multiple key angles of the twist drill 5 is based on this, and the specific adjustment method is as follows: Loosen the locking nut 212 and move the column 21 along the second slide rail 105 to adjust the distance between the measuring plate 25 and the twist drill 5; rotate the adjusting nut 213 to change the height of the column 21 to adjust the height between the measuring plate 25 and the twist drill; the alignment piece 252 moves laterally along the measuring plate 25 to make the apex of the alignment piece fit with the point to be measured on the twist drill 5 during the measurement of the front angle.

[0040] Loosen the first locking screw 231, rotate the keyhole sleeve 22, and the measuring plate 25 rotates vertically relative to the twist drill 5; loosen the second locking screw 232, rotate the rotating sleeve 24, and the measuring plate 25 rotates horizontally relative to the twist drill 5; loosen the third locking screw 321, rotate the tool holder sleeve 32, and the twist drill 5 rotates longitudinally relative to the measuring plate 25.

[0041] Measurement of the oblique angle of the transverse blade 51: (e.g.) Figure 9 As shown, rotate the tool holder sleeve 32 to align the transverse cutting edge 51 of the twist drill 5 with the transverse groove of the cross reference groove 251 on the measuring plate 25. Press the button 45 corresponding to the third angle encoder 43 to start the third angle encoder 43. Continue to rotate the tool holder sleeve 32 until the main cutting edge 52 of the twist drill 5 is aligned with the transverse groove of the cross reference groove 251. The rotation angle of the tool holder sleeve 32 is synchronously acquired and transmitted to the angle display 44, which is the bevel angle ψ of the transverse cutting edge 51 of the twist drill 5.

[0042] It should be noted that when aligning the transverse cutting edge 51 of the twist drill 5 with the transverse groove of the cross reference groove 251 on the measuring plate 25, first rotate the tool holder sleeve 32 to make the transverse cutting edge 51 horizontal. Then adjust the height of the measuring plate 25 so that the transverse groove and the transverse cutting edge 51 are at the same height. Next, adjust the measuring plate 25 closer to the twist drill 5. Then fine-tune the tool holder sleeve 32 to ensure that the transverse cutting edge 51 is inserted into the transverse groove. Avoid errors caused by relying solely on visual alignment. Finally, control the measuring plate 25 to retract a small distance (1-2mm) to prevent the measuring plate 25 from being scratched when the twist drill 5 rotates.

[0043] Vertex angle measurement: such as Figure 10 As shown, rotate the tool holder sleeve 32 to align the transverse cutting edge 51 of the twist drill 5 with the longitudinal groove of the cross reference groove 251 on the measuring plate 25; press the button 45 corresponding to the first angle encoder 41 to start the first angle encoder 41, rotate the angle measuring block 23 to make the measuring plate 25 fit against the main cutting edges 52 on both sides of the twist drill 5 respectively, and the rotation angle of the measuring plate 25 corresponding to the main cutting edges 52 on both sides is synchronously collected and transmitted to the angle display 44, and recorded as η1 and η2. The apex angle φ of the twist drill 5 is 180°-η3-η4, η1 equals η3, η2 equals η4, that is, φ is 180°-η1-η2.

[0044] Anterior angle measurement: such as Figure 11 As shown, rotate the tool holder sleeve 32 to align the transverse cutting edge 51 of the twist drill 5 with the transverse groove of the cross reference groove 251 on the measuring plate 25; press the button 45 corresponding to the second angle encoder 42 to start the second angle encoder 42, rotate the rotating sleeve 24, and adjust the position of the alignment member 252 so that the vertex 2521 of the alignment member is in contact with the point to be measured on the rake face 53 of the twist drill 5. The rotation angle of the rotating sleeve 24 is synchronously acquired and transmitted to the angle display 44, and recorded as b. The rake angle γ of the twist drill 5 is 90°-b.

[0045] Rear angle measurement: such as Figure 12 As shown, rotate the tool holder sleeve 32 to align the transverse cutting edge 51 of the twist drill 5 with the longitudinal groove of the cross reference groove 251 on the measuring plate 25; press the button 45 corresponding to the first angle encoder 41 to start the first angle encoder 41, rotate the angle measuring block 23 to make the measuring plate 25 tangent to the back face 54 at the point to be measured, and the rotation angle of the angle measuring block 23 is synchronously acquired and transmitted to the angle display 44, denoted as c, which is the back angle α of the twist drill 5.

[0046] Helix angle measurement: such as Figure 13As shown, first, place a copy paper at the bottom of the rolling groove 101, then place the twist drill 5 horizontally on the copy paper. Next, move the baffle 103 until it contacts the top of the twist drill 5, and then fix the baffle 103. At this time, the baffle 103 and the inner wall of the rolling groove 101 will clamp the twist drill 5 in the middle. Then roll the twist drill 5 to leave an inclined spiral development line 6 on the copy paper. Finally, measure the angle between the spiral development line 6 and the axis of the twist drill 5, which is the helix angle β of the twist drill 5.

[0047] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A measuring device for multiple key angles of a twist drill, characterized in that: Includes a base, a drill bit rotation mechanism, an angle measuring mechanism, and an angle display mechanism; The angle measuring mechanism includes a column, a keyhole sleeve, an angle measuring block, a rotating sleeve, and a measuring plate. The column is mounted on a base via a sliding mechanism and is equipped with a fixing component. The keyhole sleeve is configured to slide up and down on the column and is equipped with an adjusting component. The angle measuring block is rotatably mounted on the keyhole sleeve. The rotating sleeve is rotatably connected to the angle measuring block via a positioning shaft. The angle measuring block is provided with a first locking component for locking the angle measuring block and a second locking component for locking the rotating sleeve. The measuring plate is mounted on the rotating sleeve and is provided with a cross-shaped reference groove and an alignment component. The alignment component is configured to move laterally along the measuring plate. The drill bit rotating mechanism includes a support platform on the base, a tool holder sleeve rotatably inserted in the support platform, and a third locking member for locking the tool holder sleeve. The front end of the tool holder sleeve is used to fix the twist drill, and the front end of the twist drill faces the measuring plate. The angle display mechanism includes a first angle encoder mounted on a column for detecting the rotation angle of the angle measuring block, a second angle encoder mounted on a positioning shaft for detecting the rotation angle of the rotating sleeve, a third angle encoder mounted on the tool holder sleeve for detecting the rotation angle of the tool holder sleeve, and an angle display mounted on a base. The angle display is electrically connected to the first angle encoder, the second angle encoder, and the third angle encoder.

2. The measuring device for multiple key angles of a twist drill according to claim 1, characterized in that: The base is also provided with a rolling groove, and a first slide rail is provided in the rolling groove. A baffle is slidably arranged on the first slide rail, and the baffle is equipped with fasteners for locking it on the first slide rail.

3. The measuring device for multiple key angles of a twist drill according to claim 1, characterized in that: The first locking member is threadedly connected to the angle measuring block. Tightening the first locking member causes its front end to abut against the keyhole sleeve, thereby locking the position of the angle measuring block. The rotating sleeve is fixedly connected to the positioning shaft. The second locking member is threadedly connected to the angle measuring block. Tightening the second locking member causes its front end to abut against the positioning shaft, thereby locking the position of the rotating sleeve. The third locking member is threadedly connected to the support platform. Tightening the third locking member causes its front end to abut against the tool holder sleeve, thereby locking the position of the tool holder sleeve.

4. The measuring device for multiple key angles of a twist drill according to claim 1, characterized in that: The column surface is provided with a vertical anti-rotation groove, and the keyhole sleeve is provided with an anti-rotation strip that cooperates with the anti-rotation groove on the inner wall.

5. The measuring device for multiple key angles of a twist drill according to claim 1, characterized in that: The keyhole sleeve and the angle measuring block are respectively provided with a first angle scale and a first reference line for calculating the rotation angle of the angle measuring block relative to the keyhole sleeve; the angle measuring block and the rotating sleeve are respectively provided with a second angle scale and a second reference line for calculating the rotation angle of the rotating sleeve relative to the angle measuring block; the tool holder sleeve and the support platform are respectively provided with a third angle scale and a third reference line for calculating the rotation angle of the tool holder sleeve relative to the support platform.

6. The measuring device for multiple key angles of a twist drill according to claim 1, characterized in that: The measuring plate has a transverse track, and the alignment component is slidably disposed within the track and fixed by hand-tightening screws.

7. The measuring device for multiple key angles of a twist drill according to claim 1, characterized in that: The outer circumferential surface of the knife handle sleeve is provided with an annular groove, which is adapted to the third locking member so that the third locking member is inserted after being tightened and abuts against the bottom of the annular groove.

8. A measuring device for multiple key angles of a twist drill according to claim 1, characterized in that: The sliding mechanism includes a second slide rail fixedly installed on the base and a slider slidably disposed within the second slide rail, with the column and the slider being fixedly connected.

9. A measuring device for multiple key angles of a twist drill according to claim 8, characterized in that: The fixing component includes a locking nut threaded onto the column, the locking nut being adjacent to the upper surface of the second slide rail; the adjusting component includes an adjusting nut threaded onto the column, the bottom of the keyhole sleeve having a flange, the adjusting nut being adjacent to the lower surface of the flange.

10. A method for measuring multiple key angles of a twist drill, characterized in that: This method is based on the measuring device for multiple key angles of a twist drill as described in claim 2, and includes the following steps: When the sliding mechanism is activated, the angle measuring mechanism moves along the sliding mechanism to adjust the distance between the measuring plate and the twist drill; when the adjusting component is activated, the keyhole sleeve moves up and down along the column to adjust the height of the measuring plate to match the twist drill. Chisel edge angle measurement: The tool holder sleeve is rotated so that the chisel edge of the twist drill is aligned with the transverse groove of the cross reference groove on the measuring plate; after the third angle encoder is activated, the tool holder sleeve continues to rotate until the main cutting edge of the twist drill is aligned with the transverse groove of the cross reference groove. The rotation angle of the tool holder sleeve is synchronously acquired and transmitted to the angle display, which is the chisel edge angle of the twist drill. Point angle measurement: The tool holder sleeve is rotated so that the transverse cutting edge of the twist drill is aligned with the longitudinal groove of the cross reference groove on the measuring plate; after the first angle encoder is activated, the angle measuring block is rotated so that the measuring plate is in contact with the main cutting edges on both sides of the twist drill respectively. The rotation angle of the measuring plate corresponding to the main cutting edges on both sides is synchronously collected and transmitted to the angle display, recorded as η1 and η2. The point angle of the twist drill is 180°-η1-η2. Rake angle measurement: The tool holder sleeve is rotated so that the transverse cutting edge of the twist drill is aligned with the transverse groove of the cross reference groove on the measuring plate; after the second angle encoder is activated, the rotating sleeve is rotated to adjust the position of the alignment part so that the vertex of the alignment part is in contact with the point to be measured on the rake face of the twist drill. The rotation angle of the rotating sleeve is synchronously acquired and transmitted to the angle display, and recorded as b. The rake angle of the twist drill is 90°-b. Back angle measurement: The tool holder sleeve is rotated so that the cross edge of the twist drill is aligned with the longitudinal groove of the cross reference groove on the measuring plate; after the first angle encoder is activated, the angle measuring block is rotated so that the measuring plate is tangent to the back face of the tool at the point to be measured. The rotation angle of the angle measuring block is synchronously acquired and transmitted to the angle display, which is the back angle of the twist drill. Helix angle measurement: After the repeater paper is placed in the rolling groove, the twist drill is placed horizontally on the repeater paper. The baffle is moved and fixed to contact the top of the twist drill. The rolling twist drill leaves an oblique line on the repeater paper. The angle between the oblique line and the axis of the twist drill is measured, which is the helix angle of the twist drill.

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