Large diameter hole expansion drill grinding tool and its use method

Abstract

The present invention discloses a large-diameter reaming drill sharpening tool, comprising a base, a supporting plate, a positioning and pushing mechanism, and two clamping mechanisms. A T-slot is provided in the longitudinal center of the supporting plate, two clamping mechanisms are vertically supported at intervals on one end of the supporting plate, and the positioning and pushing mechanism is fixed on the other end of the supporting plate. The chip removal groove of the large-diameter reaming drill is covered with copper and then clamped and fixed in two clamping mechanisms. A cutting edge on the end face of the large-diameter reaming drill is close to the outer peripheral surface of the grinding wheel of the grinding machine, and one end of the positioning and pushing mechanism is against the center hole at the bottom of the shank of the large-diameter reaming drill. The tooling use method comprises 1) installing the large-diameter reaming drill in two clamping mechanisms, 2) installing the two clamping mechanisms and the positioning and pushing mechanism on the base respectively, and 3) grinding the three cutting edges of the cutting part of the large-diameter reaming drill in sequence. The present invention significantly improves the sharpening quality and sharpening efficiency of the three cutting edges, and prolongs the service life of the large-diameter reaming drill.

Description

Technical Field

[0001] The present invention relates to a cutting tool sharpening tool, in particular to a cutting edge sharpening tool for a large diameter (diameter of Φ30 mm or more) reamer and a use method thereof, belonging to the technical field of metal cutting processing. Background Art

[0002] The reamer is a commonly used tool in the cutting process. After long-term use, the cutting edge of the reamer is worn and needs to be sharpened by a grinding machine before it can be used again. The quality of the sharpening of the cutting edge directly determines the quality of the hole expansion of the reamer, and also determines the service life of the reamer. The end face of the reamer usually has three cutting edges at 120° to each other. For reamers with large diameters and lengths greater than 300mm, the sharpening operation is more difficult. It is difficult to grind the three cutting edges to the same cutting cone surface. A high level of operation is required and repeated grinding is required to grind the three cutting edges to the same cutting cone surface to achieve a good cutting effect. Grinding is time-consuming and labor-intensive, and the grinding quality is poor and the efficiency is very low. Summary of the invention

[0003] The purpose of the present invention is to provide a large-diameter hole-reaming drill sharpening tool which has a simple structure, is easy to install and can significantly improve the sharpening quality, and a use method thereof.

[0004] The present invention is achieved through the following technical solutions:

[0005] A large-diameter hole reaming tool comprises a base, a supporting table, a positioning and pushing mechanism and two clamping mechanisms, wherein the base comprises a steel support and several lining plates, the steel support is supported on the ground, and the lining plates are fixed on the top surface of the steel support at intervals; a T-slot is provided at the longitudinal center of the supporting table, and the lower side of the supporting table is supported on the top surface of the steel support by several lining plates; two clamping mechanisms are vertically supported at intervals on one end of the supporting table close to a grinding machine, and the positioning and pushing mechanism is fixed on one end of the supporting table away from the grinding machine; the outer periphery of the chip groove portion of the large-diameter hole reaming drill is coated with copper and then clamped and fixed in the two clamping mechanisms, a cutting edge on the end face of the large-diameter hole reaming drill is close to the outer periphery of the grinding wheel of the grinding machine, and one end of the positioning and pushing mechanism rests on the center hole at the bottom of the shank of the large-diameter hole reaming drill.

[0006] The purpose of the present invention can also be further achieved by the following technical measures:

[0007] Furthermore, the positioning and pushing mechanism includes a support and an adjustable center, the two ends of the lower part of the support are respectively fixed to the end of the support plate away from the grinding machine by fastening screws, the conical center of one end of the adjustable center is against the center hole at the bottom of the conical handle at the other end of the large-diameter reamer, the screw in the middle of the adjustable center is threadedly connected to the upper part of the support, and the other end of the adjustable center is provided with a rotating handle. An axial scale is provided on the outer circumferential surface of the cylinder at one end of the adjustable center.

[0008] Furthermore, the clamping mechanism includes an external hexagonal support ring, three T-blocks and three fastening screw and nut groups, one end of the T-blocks are evenly fixed on the centers of the three spaced outer side surfaces outside the external hexagonal support ring; the fastening screw and nut groups are evenly fixed on the centers of the other three spaced outer side surfaces of the external hexagonal support ring, and the screw ends of the screw and nut groups are respectively abutted against the outer circumferential surface of the copper sheet covering the chip groove portion of the large diameter hole reamer, thereby fixing the chip groove portion of the large diameter hole reamer in the clamping mechanism arranged at two intervals.

[0009] Furthermore, arrays of support threaded holes are arranged at intervals in the middle of both longitudinal sides of the support platform. Each group of 4 support threaded holes is divided into 2 rows and located on both sides of the T-slot. The positions of the support threaded holes correspond to the positions of the through holes at both ends of the support. The support screws pass vertically through the through holes at both ends of the support and are screwed into the corresponding threaded holes, thereby fixing the support to the other end of the support platform.

[0010] Furthermore, lifting threaded holes are respectively provided on the end heads of the lining plates at both ends of the steel support, and the supporting table lifting screws are screwed into the lifting threaded holes from bottom to top. The tops of the supporting table lifting screws are respectively supported on the four corners of the lower side of the supporting table, and the supporting table lifting screws are locked by lifting nuts.

[0011] A method for using a large-diameter hole expansion drill sharpening tool comprises the following steps:

[0012] 1) To assemble the clamping mechanism, first insert one end of the T-block into the notch at the center of the outer plane of the three intervals of the outer hexagonal support ring, and fix the T-block to the center of the outer side surface of the three intervals of the outer hexagonal support ring through two T-block fastening screws passing through the T-block. The three T-blocks are symmetrical about the axis of the outer hexagonal support ring; then fix the screw and nut groups to the center of the outer side surfaces of the other three intervals of the outer hexagonal support ring to complete the assembly of the clamping mechanism;

[0013] 2) The large-diameter reamer is installed in two clamping mechanisms. The outer periphery of the chip groove of the large-diameter reamer to be sharpened is covered with copper and then passed through the center of the two clamping mechanisms. Then, the screws of the screw-nut group are respectively screwed so that the ends of the screws are respectively against the outer periphery of the copper covering the chip groove of the large-diameter reamer; then, the length of the screws extending into the outer hexagonal support ring is respectively adjusted so that the axis of the large-diameter reamer matches the axis of the inner hole of the outer hexagonal support ring, and finally, the nuts are respectively locked;

[0014] 3) The large-diameter reaming drill together with the two clamping mechanisms and the positioning and pushing mechanism are respectively installed on the base, and the bottom of the T-shaped block at the lower part of the two clamping mechanisms of the large-diameter reaming drill installed is respectively inserted into the T-shaped slot in the longitudinal center of the supporting plate, and the two clamping mechanisms and the large-diameter reaming drill are moved to one end of the supporting plate, and then the bottom of the support of the positioning and pushing mechanism is respectively fixed to the other end of the supporting plate through the support screws; the rotating handle at the other end of the adjustable top is turned, and the conical top at one end of the adjustable top is against the center hole at the bottom of the tapered handle at the other end of the large-diameter reaming drill; then the supporting plate together with the two clamping mechanisms, the large-diameter reaming drill and the positioning and pushing mechanism thereon are hoisted to the base; and then a plurality of connecting screws are respectively screwed through the two sides of the supporting plate into the two sides of the lining plate to fix the supporting plate to the base;

[0015] 4) Adjust the relative position between the center of a cutting edge on the end face of the cutting part of the large-diameter reamer and the center of the grinding wheel. First, loosen a number of connecting screws, and then turn the support plate lifting screws under the four corners of the support plate in turn to make the support plate move up and down, thereby adjusting the center height of the large-diameter reamer clamped in the two clamping mechanisms to match the center height of the grinding wheel; finally, tighten the multiple connecting screws respectively, and tighten the lifting nuts on the four corners of the lower side of the support plate;

[0016] 5) Grind a cutting edge of the cutting part of the large diameter reamer. First loosen the screw and nut set on the upper end of the external hexagonal support ring, then turn the rotating handle on the other end of the adjustable center clockwise, push the large diameter reamer steadily toward the grinding wheel for grinding, and read the movement of the axial scale on the outer peripheral surface of one end of the adjustable center to confirm the grinding amount of a cutting edge.

[0017] 6) After the grinding of the remaining two cutting edges of the large diameter reamer cutting part is completed, turn the rotating handle at the other end of the adjustable tip counterclockwise, and the conical tip at one end of the adjustable tip will withdraw from the center hole at the bottom of the tapered shank at the other end of the large diameter reamer; then remove the support of the positioning push mechanism, and then move the T-blocks on the lower sides of the two external hexagonal support rings out of the T-slots in the longitudinal center of the support plate respectively, and then flip the external hexagonal support rings 120° around the axis of the large diameter reamer, and then push the T-blocks on the lower side of the external hexagonal support rings into the T-slots in the longitudinal center of the support plate; repeat the process of steps 3) to 5) twice, thereby completing the grinding of the remaining two cutting edges of the large diameter reamer cutting part in sequence.

[0018] The clamping mechanism of the present invention clamps the large-diameter reamer located therein by respectively passing through the ends of the three fastening screw-nut groups on the corresponding sides of the outer hexagonal support ring, which facilitates the adjustment of the axis position of the large-diameter reamer and improves the centering of the large-diameter reamer. The structure in which the T-blocks are respectively fixed at the midpoints of the corresponding sides of the outer hexagonal support ring enables the large-diameter reamer to be turned 120° around the axis of the large-diameter reamer after grinding the first cutting edge, and then grind the second and third cutting edges in sequence, so that the angles of the three grinding cutting edges remain consistent, and the cutting edges are in the same cutting plane during cutting. The adjustable center of the positioning push mechanism can push the large-diameter reamer to move axially, and the grinding amount of the cutting edge can be controlled by the axial scale on the outer peripheral surface of one end of the adjustable center. The grinding quality and efficiency of the three cutting edges are significantly improved, and the service life of the large-diameter reamer is extended.

[0019] Advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a large-diameter hole-reaming drill sharpening tooling of the present invention;

[0021] Figure 2 yes Figure 1 AA section enlarged view. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] In the description of the present invention, terms such as "up", "down", "left" and "right" indicating orientation, position and order are based on the orientation shown in the drawings, or are only for simplifying the description, and do not indicate or imply that the present invention must have a specific orientation, position and order.

[0024] like Figure 1 and Figure 2As shown, the large-diameter hole expansion drill sharpening tool of this embodiment includes a base 1, a support plate 2, a positioning and pushing mechanism 3 and two clamping mechanisms 4. The base 1 includes a steel support 11 and several lining plates 12. The steel support 11 of this example is welded with channel steel and supported on the ground. The lining plates 12 are welded and fixed on the top surface of the steel support 11 at intervals. The top surfaces of several lining plates 12 are planed and processed in one go, which can be used as the installation reference of the support plate 2. A T-slot 21 is provided in the longitudinal center of the support plate 2, and the lower side of the support plate 2 is fixed to the top surface of the steel support 11 through several lining plates 12.

[0025] The positioning and pushing mechanism 3 is fixed on the right end of the support plate 2 away from the grinding machine 10, and includes a support 31 and an adjustable center 32. The lower ends of the support 31 are fixed to the right end of the support plate 2 away from the grinding machine 10 by fastening screws 33 respectively. The screw 321 in the middle of the adjustable center 32 is threadedly connected with the upper part of the support 31. The right end of the adjustable center 32 is provided with a rotating handle 322. By rotating the adjustable center 32, the conical center 324 at the left end of the adjustable center 32 can be made to abut against the center hole 201 at the bottom of the tapered handle at the right end of the large-diameter reamer 20. An axial scale 323 is provided on the outer peripheral surface of the cylinder at the left end of the adjustable center 32 to facilitate the control of the grinding amount of the cutting edge 202 of the large-diameter reamer.

[0026] 2 clamping mechanisms 4 are supported vertically at intervals Figure 1 The support plate 2 shown is close to the left end of the grinding machine 10. The outer periphery of the chip groove 202 of the large diameter reamer 20 is covered with copper sheet 30 and then clamped and fixed in two clamping mechanisms 4. A cutting edge 203 on the end face of the large diameter reamer 20 is close to the outer periphery of the grinding wheel 101 of the grinding machine. The clamping mechanism 4 includes an outer hexagonal support ring 41, three T-blocks 42 and three fastening screw nut groups 43. One end of the T-block 42 is evenly fixed on the center of the three spaced outer side surfaces outside the outer hexagonal support ring 41. The fastening screw nut groups 43 are evenly fixed on the center of the other three spaced outer side surfaces of the outer hexagonal support ring 41. The ends of the screws 431 of the screw nut group 43 are respectively against the outer periphery of the copper sheet 30 covering the chip groove of the large diameter reamer 20, thereby fixing the chip groove 202 of the large diameter reamer 20 in the two spaced clamping mechanisms 4.

[0027] Four groups of support threaded holes 22 are arranged at intervals on both sides of the middle longitudinal part of the support plate 2. Each group of four support threaded holes 22 is divided into two rows and located on both sides of the T-slot 21. The positions of the support threaded holes 22 correspond to the positions of the through holes 311 at both ends of the support 31. The support screws 33 vertically pass through the through holes 311 at both ends of the support and are screwed into the corresponding threaded holes 22, thereby fixing the support 31 on the right end of the support plate 2. The threaded holes 22 at the corresponding positions can be selected according to the different lengths of the large-diameter reamer 20. The versatility of the present invention is improved.

[0028] The ends of the lining plates 12 at both ends of the steel support 11 are provided with lifting threaded holes 13, respectively, and the supporting plate lifting screws 5 are screwed into the lifting threaded holes 13 from bottom to top, and the tops of the supporting plate lifting screws 5 are supported on the four corners of the lower side of the supporting plate 2, respectively, and the supporting plate lifting screws 5 are locked by the lifting nuts 6. It is convenient to adjust the center height of the large-diameter reamer 20 to be consistent with the center height of the grinding wheel 101, which can improve the grinding quality of the cutting edge 203.

[0029] A method for using a large-diameter hole expansion drill sharpening tool comprises the following steps:

[0030] 1) Assemble the clamping mechanism 4. First, insert one end of the T-block 42 into the notch 411 at the center of the three intervals of the outer plane of the outer hexagonal support ring 41, and fix the T-block 42 to the center of the three intervals of the outer side surface of the outer hexagonal support ring 41 through two T-block fastening screws 421 passing through the T-block 42. The three T-blocks 42 are centrally symmetrical with the inner hole axis of the outer hexagonal support ring 41 to ensure that the outer hexagonal support ring 41 can be inserted into the T-slot 21 after rotating 120° around its axis. Then fix the screw and nut groups 43 to the center of the other three intervals of the outer side surface of the outer hexagonal support ring 41 to complete the assembly of the clamping mechanism 4.

[0031] 2) The large diameter reamer 20 is installed in the two clamping mechanisms 4. The outer periphery of the chip groove 202 of the large diameter reamer to be sharpened is covered with copper sheet 30 and then passed through the center of the two clamping mechanisms 4. Then, the screws 431 of the screw and nut set 43 are respectively screwed so that the ends of the screws 431 are respectively against the outer periphery of the copper sheet 30 covering the chip groove 202 of the large diameter reamer. The length of the screws 431 extending into the outer hexagonal support ring 41 is respectively adjusted so that the axis of the large diameter reamer 20 matches the inner hole axis of the outer hexagonal support ring 41, and finally, the nuts 432 are respectively locked.

[0032] 3) The large diameter reamer 20 together with the two clamping mechanisms 4 and the positioning and pushing mechanism 3 are respectively installed on the base 1, and the bottom of the T-shaped block 41 at the lower part of the two clamping mechanisms 4 on which the large diameter reamer 20 is installed is respectively inserted into the T-shaped slot 21 in the longitudinal center of the support plate 2, and the two clamping mechanisms 4 and the large diameter reamer 20 are moved to the left end of the support plate 2, and then the bottom of the support 31 of the positioning and pushing mechanism 3 is respectively fixed to the right end of the support plate 2 by the support screws 33. Turn the rotating handle 322 at the right end of the adjustable top 32, and the conical top 324 at the left end of the adjustable top 32 moves leftward to abut against the center hole 201 at the bottom of the tapered handle at the right end of the large diameter reamer 20. Then, the supporting plate 2 together with the two clamping mechanisms 4, the large-diameter reaming drill 20 and the positioning pushing mechanism 3 thereon are lifted onto the base 1, and then 10 connecting screws 7 are respectively passed through the two sides of the supporting plate 2 and screwed into the two sides of the lining plate 12 to fix the supporting plate 2 on the base 1.

[0033] 4) Adjust the relative position of the center of a cutting edge 203 on the end face of the cutting part of the large-diameter reamer 20 and the center of the grinding wheel 101. First loosen the multiple connection screws 7, and then turn the support plate lifting screws 5 under the four corners of the support plate 2 in sequence to make the support plate rise and fall, thereby adjusting the center height of the large-diameter reamer 20 clamped in the two clamping mechanisms 4 to match the center height of the grinding wheel 101. Finally, tighten the multiple connection screws 7 respectively, and tighten the lifting nuts 6 on the four corners of the lower side of the support plate 2.

[0034] 5) To grind a cutting edge 203 of the cutting portion of the large diameter reamer 20, first loosen the screw nut assembly 43 on the upper end of the external hexagonal support ring 41, then turn the rotating handle 322 on the right end of the adjustable center 32 clockwise, push the large diameter reamer 20 steadily toward the grinding wheel 101 for grinding, and read the movement of the axial scale 323 on the outer peripheral surface of the left end of the adjustable center 32 to confirm the grinding amount of a cutting edge 203.

[0035] 6) After the grinding of the remaining two cutting edges 203 of the cutting part of the large-diameter reamer 20 is completed, the rotating handle 322 at the right end of the adjustable tip 32 is turned counterclockwise, and the conical tip 324 at the left end of the adjustable tip 32 exits the center hole 201 at the bottom of the taper handle at the right end of the large-diameter reamer 20. Then, the support 31 of the positioning and pushing mechanism 3 is removed, and the T-blocks 42 at the lower sides of the two outer hexagonal support rings 41 are respectively removed from the T-slots 21 in the longitudinal center of the support plate 2, and then the outer hexagonal support rings 41 are turned 120° around the axis of the large-diameter reamer 20, and then the T-blocks 42 at the lower sides of the outer hexagonal support rings 41 are pushed into the T-slots 21 in the longitudinal center of the support plate 2. Repeat the process of steps 3) to 5) twice, thereby completing the grinding of the remaining two cutting edges of the cutting part of the large-diameter reamer 20 in sequence.

[0036] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A method for using a large-diameter hole reaming tool, the large-diameter hole reaming tool comprising a base, a supporting table, a positioning and pushing mechanism and two clamping mechanisms, the base comprising a steel support and several lining plates, the steel support is supported on the ground, and the lining plates are fixed on the top surface of the steel support at intervals; a T-slot is provided at the longitudinal center of the supporting table, and the lower side of the supporting table is supported on the top surface of the steel support by several lining plates; two clamping mechanisms are vertically supported at intervals on one end of the supporting table close to the grinding machine, and the positioning and pushing mechanism is fixed on the end of the supporting table away from the grinding machine; the outer peripheral surface of the chip groove portion of the large-diameter hole reaming drill is coated with copper and then clamped and fixed in the two clamping mechanisms, a cutting edge on the end face of the large-diameter hole reaming drill is close to the outer peripheral surface of the grinding wheel of the grinding machine, and one end of the positioning and pushing mechanism is against the center hole at the bottom of the shank of the large-diameter hole reaming drill; The positioning and pushing mechanism includes a support and an adjustable center. The two ends of the lower part of the support are respectively fixed to the end of the support plate away from the grinding machine by fastening screws. The conical center of one end of the adjustable center is against the center hole at the bottom of the conical handle of the other end of the large-diameter reamer. The screw in the middle of the adjustable center is threadedly connected with the upper part of the support. A rotating handle is provided at the other end of the adjustable center. The clamping mechanism comprises an outer hexagonal support ring, three T-blocks and three sets of fastening screws and nuts, one end of the T-blocks is evenly fixed on the centers of the three outer side surfaces at intervals outside the outer hexagonal support ring; the fastening screws and nuts are evenly fixed on the centers of the other three outer side surfaces at intervals of the outer hexagonal support ring, and the screw ends of the screws and nuts are respectively abutted against the outer peripheral surface of the copper sheet covering the chip groove of the large-diameter reamer, so as to fix the chip groove of the large-diameter reamer in the clamping mechanism arranged at two intervals; An axial scale is provided on the outer circumferential surface of the cylinder at one end of the adjustable tip; Arrays of support threaded holes are arranged at intervals on both sides of the middle of the support platen in the longitudinal direction. Each group of 4 support threaded holes is divided into 2 rows and located on both sides of the T-slot. The positions of the support threaded holes correspond to the positions of the through holes at both ends of the support. The support screws pass vertically through the through holes at both ends of the support and are screwed into the corresponding threaded holes, thereby fixing the support on the other end of the support platen. Lifting threaded holes are respectively arranged on the lining plate ends at both ends of the steel support, and the supporting plate lifting screws are screwed into the lifting threaded holes from bottom to top, and the tops of the supporting plate lifting screws are respectively supported on the four corners of the lower side of the supporting plate, and the supporting plate lifting screws are locked by lifting nuts; Features: The following steps are involved: 1) To assemble the clamping mechanism, first insert one end of the T-block into the notch at the center of the outer plane of the three intervals of the outer hexagonal support ring, and fix the T-block to the center of the outer side surface of the three intervals of the outer hexagonal support ring through two T-block fastening screws passing through the T-block. The three T-blocks are symmetrical about the axis of the outer hexagonal support ring; then fix the screw and nut groups to the center of the outer side surfaces of the other three intervals of the outer hexagonal support ring to complete the assembly of the clamping mechanism; 2) The large-diameter reamer is installed in two clamping mechanisms. The outer periphery of the chip groove of the large-diameter reamer to be sharpened is covered with copper and then passed through the center of the two clamping mechanisms. Then, the screws of the screw-nut group are respectively screwed so that the ends of the screws are respectively against the outer periphery of the copper covering the chip groove of the large-diameter reamer; then, the length of the screws extending into the outer hexagonal support ring is respectively adjusted so that the axis of the large-diameter reamer matches the axis of the inner hole of the outer hexagonal support ring, and finally, the nuts are respectively locked; 3) The large-diameter reaming drill together with the two clamping mechanisms and the positioning and pushing mechanism are respectively installed on the base, and the bottom of the T-shaped block at the lower part of the two clamping mechanisms of the large-diameter reaming drill installed is respectively inserted into the T-shaped slot in the longitudinal center of the supporting plate, and the two clamping mechanisms and the large-diameter reaming drill are moved to one end of the supporting plate, and then the bottom of the support of the positioning and pushing mechanism is respectively fixed to the other end of the supporting plate through the support screws; the rotating handle at the other end of the adjustable top is turned, and the conical top at one end of the adjustable top is against the center hole at the bottom of the tapered handle at the other end of the large-diameter reaming drill; then the supporting plate together with the two clamping mechanisms, the large-diameter reaming drill and the positioning and pushing mechanism thereon are hoisted to the base; and then a plurality of connecting screws are respectively screwed through the two sides of the supporting plate into the two sides of the lining plate to fix the supporting plate to the base; 4) Adjust the relative position between the center of a cutting edge on the end face of the cutting part of the large-diameter reamer and the center of the grinding wheel. First, loosen a number of connecting screws, and then turn the support plate lifting screws under the four corners of the support plate in turn to make the support plate move up and down, thereby adjusting the center height of the large-diameter reamer clamped in the two clamping mechanisms to match the center height of the grinding wheel; finally, tighten the multiple connecting screws respectively, and tighten the lifting nuts on the four corners of the lower side of the support plate; 5) Grind a cutting edge of the cutting part of the large diameter reamer. First loosen the screw and nut set on the upper end of the external hexagonal support ring, then turn the rotating handle on the other end of the adjustable center clockwise, push the large diameter reamer steadily toward the grinding wheel for grinding, and read the movement of the axial scale on the outer peripheral surface of one end of the adjustable center to confirm the grinding amount of a cutting edge. 6) After completing the grinding of the remaining two cutting edges of the large diameter reamer cutting part, turn the rotating handle at the other end of the adjustable tip counterclockwise, and the conical tip at one end of the adjustable tip will withdraw from the center hole at the bottom of the tapered shank at the other end of the large diameter reamer; then remove the support of the positioning push mechanism, and then move the T-blocks on the lower sides of the two external hexagonal support rings out of the T-slots in the longitudinal center of the support plate respectively; then flip the external hexagonal support ring 120° around the axis of the large diameter reamer, and then push the T-blocks on the lower side of the external hexagonal support ring into the T-slots in the longitudinal center of the support plate; repeat the process of steps 3) to 5) twice, thereby completing the grinding of the remaining two cutting edges of the large diameter reamer cutting part in sequence.

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