CN114871863B - Method for grinding drill bit by using universal quick grinding machine - Google Patents

Abstract

The application discloses a method for grinding a drill bit by using a universal quick grinding machine, which comprises the following steps: a drill clamp, a drill positioning device, a main cutting edge positioning grinding device and a chisel edge positioning grinding device; inserting a drill bit clamp into a positioning bracket, inserting a drill bit into a drill bit fastening sleeve, penetrating a clamping piece to prop against a positioning terminal, when left and right positioning sliding blocks prop against corresponding drill bit outer side tips, and when the rear side of the right end surface of a front side protruding block and the front side of the left end surface of a rear side protruding block prop against the front cutter surface of the drill bit, positioning is completed, and finally clamping the drill bit in the drill bit clamp; grinding the main cutting edge of the drill bit; and thirdly, grinding the chisel edge of the drill bit. According to the method for grinding the drill bit by using the universal quick grinding machine, the positioning reference of the grinding machine is not required to be debugged aiming at the twist drill bits to be ground with different diameters, and the method is simple and quick in clamping and positioning, high in universality, less in time consumption, high in efficiency, high in grinding quality of the drill bit and long in service life.

Description

Method for grinding drill bit by using universal quick grinding machine

Technical Field

The application relates to a method for grinding a drill bit, in particular to a method for grinding the drill bit by using a universal quick grinding machine, which can quickly clamp and position the drill bit and realize quick grinding of the cutting edge of the drill bit.

Background

Hand drills and bench drills are widely used in machining processes, but when the drill bit of the hand drill or bench drill is dulled, the cutting edge of the hand drill or bench drill is ground and can be reused. Currently, most grinding methods are performed by grinding on a grinder by a hand-held drill. The hand grinding drill mainly depends on experience of operators, and because the end part of the drill has strict size requirements (referring to fig. 21 and 22, the end part of the drill mainly comprises a main cutting edge 0-1, a chisel edge 0-2, a secondary cutting edge (edge) 0-3 and a vertex angle a), the hand grinding drill is difficult to grasp technical requirements of various angles, symmetry, finishing degree, grinding amount and the like, so that the cutting capability of the cutting edge of the drill is reduced, the service life of the drill is greatly reduced, and certain safety risks exist.

The utility model provides a small-size electronic grinding bit machine of application number 02270832.4, it includes base (1), motor (2), emery wheel (3), be used for centre gripping drill bit anchor clamps (4) and bearing structure thereof, emery wheel (3) are installed on motor (2) output shaft, motor (2) set up on base (1), bearing structure includes knife rest (5), on anchor clamps rotationally install the knife rest, knife rest (5) and anchor clamps (4) set up in front of emery wheel (3). The advent of this abrasive drilling machine is an improvement over manual abrasive drilling, but still suffers from the following drawbacks: 1. the clamping and positioning steps are multiple, and the time is long; 2. the metal scraps generated after the drill bit is ground are splashed everywhere, so that the drill bit is not easy to clean; 3. the structure is complex, and the subsequent debugging and maintenance are not easy.

The inventor of the present application has proposed a technical improvement (see paragraphs [0020] - [0026] of the "grinding machine" specification of application number 201621269580.5) for the above technical defects over a number of years:

the motor 2 is fixed on the base 1, the diamond wheel 3 is fixedly connected with the motor 2, and the motor 2 drives the diamond wheel 3 to rotate. The drill bit positioning device comprises: the tool rest 4 is fixed on the base 1, the tool rest 4 comprises a circular ring part 41 and a fixing part 42, the fixing part 42 is fixed on the base 1 through a vertical plate, the circular ring part 41 and the fixing part 42 are mutually fixed, the fixing part 42 is provided with a stop block 421, the tail part of the stop block 421 is provided with threads, and the axial position of the stop block 421 can be adjusted by adjusting the threads. The drill chuck 9 comprises a cone 91, a threaded sleeve 92 and a top block 93, wherein the cone 91 is fixed on the threaded sleeve 92, the top block 93 is arranged on the cone 91, the annular part 41 is provided with a groove 411, when the threaded sleeve of the drill chuck 9 is clamped on the tool rest 4, the top block 93 is clamped on the groove 411, two elastic pieces 5 are movably fixed on the tool rest 4, the two elastic pieces 5 are pushed to be separated when the poking button 6 rotates, specifically, two ends, far away from each other, of the two elastic pieces 5 are respectively fixed on the fixing part 42 of the tool rest 4, and the other ends can mutually move. The main cutting edge positioning and grinding device comprises: the holder 7 has a first positioning hole 71 on the front side of the diamond wheel 3. The chisel edge positioning and grinding device comprises: the stand 8 has a second positioning hole 81 located on the upper side of the diamond wheel 3. The drill chuck 9 is detachably fixed to the base 1, the drill chuck 9 being mated with the counter holder 4. The grinding machine further comprises a support 72 fixed to the support 7 and located at the first positioning hole 71, and the drill chuck 9 is matched with the support 72. The threaded sleeve 92 of the drill chuck 9 is threadably connected to and disconnected from the sleeve 72. The grinding machine further comprises a cover plate 82 fixed to the stand 8 and located at the second positioning hole 81, and the drill chuck 9 is matched with the cover plate 82. The threaded sleeve 92 of the drill chuck is threadably connected to and disconnected from the cover plate 82.

The drill bit is clamped in a drill chuck at a preset circumferential position (circumferential angle) and a preset axial position (axial reference), then the drill chuck clamped with the drill bit is respectively inserted into a main cutting edge positioning grinding device and a chisel edge positioning grinding device, the main cutting edge positioning grinding device and the chisel edge positioning grinding device are designed according to the circumferential angle and the axial reference of the drill bit in the drill chuck, the main cutting edge of the drill bit inserted into the main cutting edge positioning grinding device is just abutted against a grinding wheel for grinding, the chisel edge of the drill bit inserted into the chisel edge positioning grinding device is just abutted against a grinding wheel for grinding, and the grinding amounts of the main cutting edge positioning grinding device and the chisel edge positioning grinding device are both determined by the preset axial reference of the drill bit. The improvement is simple and quick in bit clamping and positioning, and the grinding bit becomes simple and efficient, thereby being a breakthrough progress in the industry. However, in practical application, the inventor finds that the technical scheme still has a great technical defect: 1. the universality is poor: the spiral rising screw pitches of the edges of the twist drill with different diameters are different, the small drill and the large drill are respectively positioned by using the mode that two elastic sheets 5 clamp the edges, the stay positions and angles of the main cutting edge and the chisel edge of the small drill are greatly different from those of the main cutting edge and the chisel edge of the large drill, the axial heights of the stop blocks 421 need to be correspondingly adjusted due to poor positioning universality, the grinding efficiency is greatly reduced, and the grinding quality is seriously affected due to unsuitable adjustment heights. 2. The structure of the bracket 7 during grinding of the drill bit enables the drill bit to feed grinding amount only along a single axial direction, so that for the drill bit with larger diameter, the main rear cutter surface cannot be sufficiently ground, and the grinding quality is also affected.

Disclosure of Invention

The application aims to provide a method for grinding a drill bit by using a universal quick grinding machine, aiming at twist drill bits to be ground with different diameters, the positioning standard of the grinding machine is not required to be debugged, and the method is simple and quick in clamping and positioning, strong in universality, less in time consumption, high in efficiency, high in grinding quality of the drill bit and long in service life.

In order to achieve the above purpose, the application adopts the following technical scheme:

a method of bit grinding using a universal rapid grinding machine, the universal rapid grinding machine comprising: the drill bit clamp comprises a drill bit clamp sleeve, a locking tray and a plurality of clamping pieces, wherein the locking tray and the clamping pieces are arranged in the drill bit clamp sleeve in a sliding manner, the inclined planes of the lower parts of the outer sides of the clamping pieces are matched with the inner walls of conical sections of the middle lower parts of the drill bit clamp sleeve, the upper ends of the clamping pieces are arranged in corresponding clamping piece sliding grooves of the lower ends of the locking tray in a sliding manner, the upper ends of the drill bit clamp sleeve are in threaded connection with a drill bit tight sleeve, and annular grooves of the upper ends of the locking tray are clamped on convex rings of the side walls of the downward extension of the drill bit tight sleeve; the drill bit positioning device comprises a positioning bracket arranged on the bottom shell, a positioning terminal fixedly arranged at the lower part of the positioning bracket and used for axially positioning a drill bit, and a first circular ring port matched with a drill bit jacket of a drill bit clamp is arranged at the upper end part of the positioning bracket; the left side of the positioning bracket is provided with a left positioning slide block, the right side of the positioning bracket is provided with a right positioning slide block, the upper end of the left positioning slide block is provided with a front side lug extending rightward, the rear side of the front side lug is provided with a left positioning slide block inclined plane, the upper end of the right positioning slide block is provided with a rear side lug extending leftward, and the front side of the rear side lug is provided with a right positioning slide block inclined plane; the method comprises the following steps:

step one: positioning and fastening of drill bits in drill bit holders

Inserting the drill bit clamp into the positioning bracket, enabling the two symmetrically arranged drill bit clamp positioning convex blocks to be clamped in the corresponding first positioning bayonets, inserting the drill bit into the drill bit fastening sleeve and penetrating through the clamping pieces, and separating the left positioning slide block from the right positioning slide block on the left side and the right side by overcoming the elastic force of the slide block driving mechanism through the rotary adjusting spanner, so that the drill bit can continuously downwards push against the positioning terminal;

when the front end of the drill bit is propped against the positioning terminal, the drill bit is stopped to be pressed downwards, so that the drill bit is in a free state, the adjusting spanner is released, the left positioning slide block and the right positioning slide block are folded under the action of the elasticity of the slide block driving mechanism, the right end face of the front side bump is propped against one outer side tip of the drill bit, the left end face of the rear side bump is propped against the other outer side tip of the drill bit, the drill bit is driven to rotate, and when the rear side of the right end face of the front side bump and the front side of the left end face of the rear side bump are propped against the front cutter face of the drill bit, the left positioning slide block and the right positioning slide block are blocked, and the positioning is completed;

the drill bit jacket is screwed downwards, so that the drill bit jacket drives the locking tray to descend along the guide groove, the locking tray presses the clamping piece downwards, the inclined surface of the clamping piece is extruded by the inner wall of the conical section to move inwards, the drill bit is clamped, and at the moment, the drill bit fastening sleeve, the drill bit jacket, the locking tray, the clamping piece and the drill bit are fastened together to form a drill bit clamp whole;

step two: grinding of the main cutting edge of a drill bit

Pulling out the whole bit clamp from the positioning bracket, inserting the whole bit clamp into a rotating sleeve of a main cutting edge positioning grinding device, enabling two symmetrically arranged bit clamp positioning convex blocks to be clamped in corresponding second positioning bayonets, starting a dustproof switch, driving a CBN grinding wheel to grind one main cutting edge of the bit through a motor, pulling out the whole bit clamp to rotate 180 degrees after grinding, inserting the whole bit clamp into the rotating sleeve again, and grinding the other main cutting edge of the bit;

step three: grinding of chisel edge of drill bit

After the main cutting edge is ground, the drill clamp is integrally pulled out and inserted into the fixed support, so that the two symmetrically arranged drill clamp positioning convex blocks are clamped in the corresponding third positioning bayonets, the chisel edge of the drill is ground through the CBN grinding wheel 27, and after the grinding is finished, the drill clamp is pulled out, integrally rotates 180 degrees and is inserted into the fixed support again to grind again.

Step four: in the second step, before grinding the two main cutting edges, the whole drill bit clamp is pushed to rotate around the shaft pin along with the supporting sleeve by a preset angle according to the requirement, and then the locking knob is screwed to fix the supporting sleeve, wherein the preset angle is a scale range of 110-135 degrees marked on the machine shell.

Step five: in the second step, when the main cutting edge is ground, the rotating sleeve is reciprocally rotated for a plurality of times within the range of 0-60 degrees, so that the main rear cutter surface has a preset radian, and the service life of the ground drill bit is prolonged.

Compared with the prior art, the application has the beneficial effects that: by adopting the grinding method, the drill bit is positioned in a three-dimensional way by the outer side tip and the front cutter of the drill bit, and the problem of poor universality in the prior art is perfectly solved: the axial height of the stop block 421 is required to be correspondingly adjusted for the twist drills with different diameters, so that the grinding efficiency is greatly reduced, the grinding quality is seriously affected due to unsuitable adjustment height, the positioning standard of the grinding machine is not required to be adjusted for the twist drills to be ground with different diameters, the clamping and positioning are simple and quick, the time consumption is less, the efficiency is high, the grinding quality of the drill is high, and the service life is greatly prolonged.

The method has the further beneficial effects that: the grinding method for grinding the included angle a after the supporting sleeve rotates around the shaft pin and is fixed can meet the grinding requirements of two main cutting edges, and scales of 110-135 degrees are marked on the machine shell for conveniently adjusting the preset angle of the supporting sleeve around the shaft pin, for example, 110 degrees are selected when the drill bit is used for drilling materials such as hard wood and aluminum alloy, 118 degrees are selected when the drill bit is used for drilling common steel, and 135 degrees are selected when the drill bit is used for drilling materials such as cast iron and concrete. The main cutting edge ground in this way is more convenient and quick, and the drilling quality of the drill bit can be further improved. When the main cutting edge is ground, the rotating sleeve is reciprocally rotated for a plurality of times within the range of 0-60 degrees, the radian required by the main rear cutter surface can be ground, and the service life of the ground drill bit is longer.

Drawings

FIG. 1 is a schematic diagram of the disassembled structure of a general purpose rapid grinding machine used in the present application;

FIG. 2 is a schematic view of the assembled structure of FIG. 1 with the bit holder omitted;

FIG. 3 is a schematic view of the assembled structure of FIG. 1 with the drill bit and upper dust cap omitted;

FIG. 4 is a schematic view of the engagement structure of the bit holder and bit positioning device of FIG. 1;

FIG. 5 is a schematic view of the bit holder of FIG. 1 mated with a bit positioning device in another direction;

FIG. 6 is a schematic view of the positioning structure of the drill bit of FIG. 1;

FIG. 7 is an M-M cross-sectional view of the drill bit of FIG. 6 prior to positioning;

FIG. 8 is an M-M cross-sectional view of the bit of FIG. 6 after positioning;

FIG. 9 is a schematic perspective view of FIG. 8;

FIG. 10 is a schematic view of the other direction of FIG. 6;

FIG. 11 is a schematic top view of the left positioning slide, positioning terminal, right positioning slide of FIG. 1;

FIG. 12 is a left side view of the right positioning slide of FIG. 1;

FIG. 13 is an enlarged view of the left and right positioning blocks of FIG. 1;

FIG. 14 is a schematic view of the structure of the single clip of FIG. 1;

FIG. 15 is a schematic view of the rotating sleeve of FIG. 1;

FIG. 16 is a schematic view of the rotational sleeve and positioning sleeve positional relationship of FIG. 1;

FIG. 17 is a schematic view of the connection of the rotating sleeve and the stationary bracket of FIG. 1;

FIG. 18 is a schematic view of the drill clamp insert turret of FIG. 1 in a ground condition of the main cutting edge;

FIG. 19 is a schematic view of the drill clamp insert holder of FIG. 1 in a chisel edge grinding configuration;

FIG. 20 is a schematic circuit diagram of a generic rapid tooling machine;

FIG. 21 is a schematic view of the construction of a twist drill;

fig. 22 is a schematic view of the drill bit of fig. 21.

The technical features represented by the reference numerals in the figures are as follows:

the drill bit tightening sleeve 1, the drill bit jacket 2, the drill bit clamp positioning lug 2-1, the locking tray 3, the clamp piece sliding groove 3-1, the annular groove 3-2, the clamp piece 4, the LED lamp 5, the positioning bracket 6, the first annular port 6-1, the first clamp positioning bayonet 6-2, the dust-proof switch 7, the upper dust-proof cover 8, the rotating sleeve 9, the second annular port 9-1, the second positioning bayonet 9-2, the lower end section 9-3, the positioning sleeve 10, the positioning pin 11, the shaft pin clamping spring 12, the shaft pin 13, the supporting sleeve 14, the dust-proof sleeve 15, the dust-proof sleeve clamping spring 16, the upper shell 17, the window 17-1, the locking washer 18, the locking knob 19, the fixed bracket 20, the third annular port 20-1, the third positioning bayonet 20-2, the side dust-proof cover 21, the adjusting spanner finger 22, the split ring 23 and the adjusting shaft 24, the motor 25, the grinding wheel joint 26, the CBN grinding wheel 27, the positioning shaft 28, the flat pad 29, the positioning spring 30, the left positioning slider 31, the front projection 31-1, the front projection right end face 31-2, the left positioning slider inclined face 31-3, the front projection right end face rear side 31-4, the positioning terminal 32, the right positioning slider 33, the rear projection 33-1, the rear projection left end face 33-2, the right positioning slider inclined face 33-3, the rear projection left end face front side 33-4, the front adjusting cam 34, the rear adjusting cam 35, the rectifier 36, the grinding wheel clamping plate 37, the base 38, the transparent cover 39, the soft foot 40, the cable 41, the drill 42, the main cutting edge 0-1, the chisel edge 0-2, the auxiliary cutting edge (edge) 0-3, the apex angle a, the front cutting face 0-4, the main flank 0-5, 0-6 parts of drill bit outer side tip and 0-7 parts of unknown edge.

Detailed Description

In order to make the technical scheme of the present application clearer, the present application will be described in detail with reference to fig. 1 to 22. It should be understood that the detailed description and specific examples, while indicating the application, are intended for purposes of illustration only and are not intended to limit the scope of the application.

Example 1

The application is a method of grinding a drill bit using a universal fast grinding machine, the universal fast grinding machine comprising: the casing is formed by covering together a bottom shell 38 and an upper shell 17, a motor 25 which is arranged at the bottom shell 38 and is used for driving a CBN grinding wheel 27 to rotate, a drill clamp, a drill positioning device, a main cutting edge positioning grinding device and a chisel edge positioning grinding device, wherein the drill clamp comprises a drill clamp sleeve 2, a locking tray 3 and a plurality of clamping pieces 4 which are arranged in the drill clamp sleeve 2 in a sliding manner, an inclined plane 4-1 at the lower part of the outer side of each clamping piece 4 is matched with the inner wall of a conical section 2-2 at the lower part of the drill clamp sleeve 2, the upper end of each clamping piece 4 is arranged in a corresponding clamping piece chute 3-1 at the lower end of the locking tray 3 in a sliding manner, the upper end of the drill clamp sleeve 2 is in threaded connection with the drill clamp sleeve 1, and a ring groove 3-2 at the upper end of the locking tray 3 is clamped on a convex ring 1-1 of the side wall of the drill clamp sleeve 1 which extends downwards; the drill bit positioning device comprises a positioning bracket 6 arranged on a bottom shell 38, a positioning terminal 32 fixedly arranged at the lower part of the positioning bracket 6 and used for axially positioning a drill bit 42, and a first circular ring port 6-1 matched with a drill bit jacket 2 of a drill bit clamp is arranged at the upper end part of the positioning bracket 6; the left side of the positioning bracket 6 is provided with a left positioning slide block 31, the right side of the positioning bracket 6 is provided with a right positioning slide block 33, the upper end of the left positioning slide block 31 is provided with a front side lug 31-1 extending rightwards, the rear side of the front side lug 31-1 is provided with a left positioning slide block inclined surface 31-3, the upper end of the right positioning slide block 33 is provided with a rear side lug 33-1 extending leftwards, and the front side of the rear side lug 33-1 is provided with a right positioning slide block inclined surface 33-3; the using method comprises the following steps:

step one: positioning and fastening of drill bits in drill bit holders

Inserting the drill bit clamp into the positioning bracket 6, enabling the two symmetrically arranged drill bit clamp positioning lugs 2-1 to be clamped in the corresponding first positioning bayonets 6-2, inserting the drill bit 42 into the drill bit fastening sleeve 1 and penetrating through the clamping piece 4, and separating the left and right positioning sliding blocks 31 and 33 on the left side and the right side by overcoming the elastic force of the sliding block driving mechanism through the rotary adjusting spanner 22 so that the drill bit 42 can continuously downwards push against the positioning terminal 32;

when the front end of the drill bit 42 is propped against the positioning terminal 32, the downward pressing of the drill bit 42 is stopped, the drill bit 42 is in a free state, the adjusting spanner 22 is released, the left and right positioning sliding blocks 31 and 33 are folded under the action of the elasticity of the sliding block driving mechanism, the right end face 31-2 of the front side convex block is propped against one outer side tip 0-6 of the drill bit 42, the left end face 33-2 of the rear side convex block is propped against the other outer side tip 0-6 of the drill bit 42, so that the drill bit 42 is driven to rotate, and when the rear side 31-4 of the right end face of the front side convex block and the front side 33-4 of the rear side convex block are propped against the front cutter face 0-4 of the drill bit 42, the left and right positioning sliding blocks 31 and 33 are blocked, and the positioning is completed;

the drill bit clamping sleeve 2 is screwed downwards, so that the drill bit clamping sleeve 2 drives the locking tray 3 to descend along the guide groove, the locking tray 3 presses the clamping piece 4 downwards, the inclined surface 4-1 of the clamping piece 4 is extruded by the inner wall of the conical section 2-2 to move inwards, the drill bit 42 is clamped, and at the moment, the drill bit fastening sleeve 1, the drill bit clamping sleeve 2, the locking tray 3, the clamping piece 4 and the drill bit 42 are fastened together to form a drill bit clamping whole;

step two: grinding of the main cutting edge of a drill bit

The whole drill bit clamp is pulled out from the positioning bracket 6 and inserted into the rotating sleeve 9 of the main cutting edge positioning and grinding device, so that two symmetrically arranged drill bit clamp positioning convex blocks 2-1 are clamped in corresponding second positioning bayonets 9-2, a dustproof switch 7 is started, a CBN grinding wheel 27 is driven by a motor 25 to grind one main cutting edge 0-1 of a drill bit 42, after grinding is finished, the whole drill bit clamp is pulled out, rotated 180 degrees and inserted into the rotating sleeve 9 again, and the other main cutting edge 0-1 of the drill bit 42 is ground;

step three: grinding of chisel edge of drill bit

After the main cutting edge is ground, the whole drill clamp is pulled out and inserted into the fixed support 20, so that the two symmetrically arranged drill clamp positioning convex blocks 2-1 are clamped in the corresponding third positioning bayonets 20-2, the chisel edge 0-2 of the drill 42 is ground through the CBN grinding wheel 27, and after the grinding is finished, the whole drill clamp is pulled out, is rotated 180 degrees and is inserted into the fixed support 20 again for grinding again.

Step four: in the second step, before the two main cutting edges 0-1 are ground, the whole drill bit clamp is pushed to rotate along with the supporting sleeve 14 around the shaft pin 13 by a preset angle according to the requirement, and then the locking knob 19 is screwed to fix the supporting sleeve 14, wherein the preset angle is a scale range of 110-135 degrees marked on the machine shell.

Step five: in the second step, when the main cutting edge is ground, the rotating sleeve is reciprocally rotated for 9 times within the range of 0-60 degrees, so that the main rear cutting edge surface has a preset radian, and the service life of the ground drill bit is prolonged.

Example 2

The universal quick grinding machine used in the application comprises a shell formed by covering a bottom shell 38 and an upper shell 17 together, a motor 25 arranged on the bottom shell 38 and used for driving a CBN grinding wheel 27 to rotate, a bit clamp, a bit positioning device, a main cutting edge positioning grinding device and a chisel edge positioning grinding device,

the drill bit clamp comprises a drill bit clamp sleeve 2, a locking tray 3 and a plurality of clamping pieces 4 which are slidably arranged in the drill bit clamp sleeve 2, wherein an inclined plane 4-1 at the lower part of the outer side of each clamping piece 4 is matched with the inner wall of a conical section 2-2 at the middle lower part of the drill bit clamp sleeve 2, the upper ends of the clamping pieces 4 are slidably arranged in clamping piece sliding grooves 3-1 corresponding to the lower ends of the locking tray 3, the upper ends of the drill bit clamp sleeve 2 are in threaded connection with a drill bit fastening sleeve 1, and annular grooves 3-2 at the upper ends of the locking tray 3 are clamped on convex rings 1-1 on the side walls of the downward extending drill bit fastening sleeve 1;

the drill bit positioning device comprises a positioning bracket 6 arranged on a bottom shell 38, a positioning terminal 32 fixedly arranged at the lower part of the positioning bracket 6 and used for axially positioning a drill bit 42, and a first circular ring port 6-1 matched with a drill bit jacket 2 of a drill bit clamp is arranged at the upper end part of the positioning bracket 6;

the left side of the positioning bracket 6 is provided with a left positioning slide block 31, the right side of the positioning bracket 6 is provided with a right positioning slide block 33, the upper end of the left positioning slide block 31 is provided with a front side lug 31-1 extending rightwards, the rear side of the front side lug 31-1 is provided with a left positioning slide block inclined surface 31-3, the upper end of the right positioning slide block 33 is provided with a rear side lug 33-1 extending leftwards, and the front side of the rear side lug 33-1 is provided with a right positioning slide block inclined surface 33-3;

when the bit jacket 2 is inserted into the positioning bracket 6, two symmetrically arranged bit clamp positioning lugs 2-1 on the bit jacket 2 are clamped in corresponding first positioning bayonets 6-2 on the first circular ring port 6-1, in the state, when the bit 42 to be ground is inserted into the bit clamp, the front end of the bit 42 passes through the clamping piece 4, the left and right positioning sliders 31-33 are separated from each other by rotating the adjusting spanner 22 against the elasticity of the slider driving mechanism, so that the front end of the bit 42 is abutted against the positioning terminal 32, in the state, the bit 42 is in a free state, the left and right positioning sliders 31-33 are folded under the action of the elasticity of the slider driving mechanism, the right end face 31-2 of the front lug is abutted against one bit outer side 0-6 of the bit 42, the left end face 33-2 of the rear lug is abutted against the other bit outer side 0-6 of the bit 42, thereby driving the bit 42 to rotate, when the left and right end faces 33-4 of the front lugs of the front lug are abutted against the front faces 0-4 of the bit 42, the left and right blades 31-33 are abutted against the left and right sliders of the front faces 0-4 of the bit 42, the left and right blades 31-33-3 are pressed down against the clamping disc 4, thereby pressing down the clamping disc 2 is clamped by the clamping disc 2, and the clamping disc 2 is clamped down, and the clamping disc 2 is pressed down, thereby, and the clamping disc 2 is clamped, and the bit clamp is pressed down, and the bit is tightly, and the bit is pressed.

Preferably, the main cutting edge positioning and grinding device comprises a rotating sleeve 9, wherein the upper end part of the rotating sleeve 9 is provided with a second circular ring port 9-1 which is matched with the drill clamping sleeve 2 of the drill clamp; when the bit clamping sleeve 2 is inserted into the rotating sleeve 9, two symmetrically arranged bit clamping positioning lugs 2-1 on the bit clamping sleeve 2 are clamped in corresponding second positioning bayonets 9-2 on the second circular ring port 9-1.

As a further preferred aspect, the chisel edge positioning grinding device includes a fixed bracket 20 disposed on the bottom shell 38, the fixed bracket 20 having a third annular port 20-1 adapted to the bit holder 2 of the bit holder; when the bit holder 2 is inserted into the fixing bracket 20, two symmetrically arranged bit holder positioning lugs 2-1 on the bit holder 2 are clamped in corresponding third positioning bayonets 20-2 on the third circular ring port 20-1. The third annular port 20-1 may be covered with an upper dust cap 21 when the abrasive drilling machine is not in use.

As a further preferred aspect, the main cutting edge positioning grinding device further comprises a supporting sleeve 14, two lugs at the lower part of the supporting sleeve 14 are hinged in corresponding hinge holes of the vertical plate of the fixed bracket 20 through shaft pins 13, the shaft pin clamp springs 12, the lower end section 9-3 of the rotating sleeve 9 is sleeved in an inner hole of the supporting sleeve 14, a dust cover 15 is sleeved at the lower end of the lower end section 9-3 penetrating through the inner hole of the supporting sleeve 14, and the dust cover 15 is stopped by the dust cover clamp springs 16.

Preferably, a locking knob 19 for locking the supporting sleeve 14 from rotating is arranged on the right side of the upper shell 17, and a locking washer 18 is sleeved on the locking knob 19, so that a drill bit clip inserted into the rotating sleeve can rotate along with the supporting sleeve around a shaft pin, and when the supporting sleeve is adjusted to rotate for a preset angle around the shaft pin according to the requirement and is fixed, two main cutting edges with an included angle a meeting the requirement can be ground; in order to facilitate the adjustment of the preset angle of rotation of the support sleeve around the shaft pin, the casing is marked with a scale of 110-135 degrees, for example, 110 degrees are selected when the drill bit is used for drilling hard wood, aluminum alloy and other materials, 118 degrees are selected when the drill bit is used for drilling common steel, and 135 degrees are selected when the drill bit is used for drilling cast iron, concrete and other materials. The main cutting edge ground in this way accords with actual requirements better, can further improve the drilling quality of drill bit. Preferably, the upper end of the supporting sleeve 14 is provided with a positioning pin 11 sleeved with a positioning sleeve 10, and a baffle plate 9-4 used for stopping the lower end of the rotating sleeve 9 is arranged at the upper end of the supporting sleeve 14, so that the maximum angle of rotation of the rotating sleeve 9 in an inner hole of the supporting sleeve 14 is limited to be 60 degrees. The second annular port 9-1 of the swivel sleeve 9 may be covered with a dust cap 8 when the abrasive drilling machine is not in use.

As a further preferable aspect, the slide driving mechanism includes positioning shafts 28 disposed on the left and right sides of the positioning bracket 6, the left positioning slide 31 and the right positioning slide 33 are slidably sleeved on the corresponding positioning shafts 28, positioning springs 30 for driving the corresponding positioning slide to close are disposed on the two positioning shafts 28, a flat pad 29 is disposed on the outer side of the positioning springs 30, a front adjusting cam 34 and a rear adjusting cam 35 for separating the left and right positioning slide 31 and 33 on the left and right sides against the elastic force of the positioning springs 30 are disposed on the adjusting shaft 24 between the left positioning slide 31 and the right positioning slide 33, the front adjusting cam 34 and the rear adjusting cam 35 are axially stopped by the split rings 23 on the adjusting shaft 24, and the front end of the adjusting shaft 24 is provided with the adjusting spanner finger 22.

As a further preferred option, an LED lamp 5 is provided at the front end of the housing, and a window 17-1 is provided at the front end of the upper case 17 for observing the positioning of the drill 42. The front end of the shell is provided with the LED lamp, the front end of the upper shell is provided with the window, the positioning condition of the drill bit on the drill bit positioning device can be observed, the operation of operators is facilitated, and the positioning efficiency and accuracy are improved.

As a further preference, the left positioning slider 31 and the right positioning slider 33 are the same size. The left positioning slide block and the right positioning slide block can be interchanged, the two positioning slide blocks with one shape and one size are processed, the front surfaces of the two positioning slide blocks are oppositely arranged on the left side and the right side, the processing cost is saved, the symmetry of a ground drill bit can be improved, and the positioning precision is improved. Preferably, when the drill 42 is positioned, the axes of the front projection right end face rear side 31-4, the rear projection left end face front side 33-4 and the drill 42 are in the same plane, so that the drill 42 can be stably rotated and stopped at the positioning position more accurately. It should be noted that, if the symmetry of the left and right positioning sliders 31, 33 is good, during positioning, the rear side 31-4 of the right end face of the front bump and the front side 33-4 of the left end face of the rear bump can abut against the corresponding rake face 0-4 of the drill 42, and even if only one of them abuts against the rake face 0-4, the circumferential positioning position of the drill 42 can meet the requirement as long as it is within the conventional finishing error.

As a further preferred aspect, the right end face 31-2 of the front lug and the left end face 33-2 of the rear lug are parallel to each other and form an included angle of 8-12 degrees with the front-rear direction, and the inner hole of the rotating sleeve 9 has an offset angle of 4-8 degrees, so as to adapt to the included angle between the two main cutting edges 0-1 of the drill 42 during grinding.

As a further preferred aspect, the inclination angles of the left positioning slider inclined surface 31-3 and the right positioning slider inclined surface 33-3 are adapted to the helix angle of the minor cutting edge 0-3, for example, 45±0.5 degrees is preferred; the minimum distance between the front side bump right end face 31-2 and the rear side bump left end face 33-2 of the left positioning slider 31, right positioning slider 33 is preferably 0.8 mm; the distance between the left positioning slider inclined surface 31-3 and the top end of the right positioning slider inclined surface 33-3 is preferably 8.4 mm.

Compared with the prior art, the universal quick grinding machine has the beneficial effects that: due to the adoption of the technical scheme, when the front end of the drill bit is propped against the positioning terminal and is in a free state, the left positioning slide block and the right positioning slide block of the drill bit positioning device are folded under the action of the elasticity of the slide block driving mechanism, the right end face of the front lug is propped against one drill bit outer side tip of the drill bit, the left end face of the rear lug is propped against the other drill bit outer side tip of the drill bit, thereby driving the drill bit to rotate, the rear side of the right end face of the front lug and the front side of the left end face of the rear lug are propped against the front cutter face of the drill bit, the left positioning slide block and the right positioning slide block are blocked, and positioning is completed, in this state, the drill bit jacket is screwed downwards, the locking tray is driven to descend along the guide groove, the locking tray is pressed down by the inclined face of the clamping piece to move inwards by the inner wall of the conical section, thus the drill bit which is positioned is clamped, the grinding machine of the structure creatively selects the drill bit outer side tip and the front cutter face to perform three-dimensional positioning, and the problem that the universality is poor in the prior art is solved: the axial height of the stop block 421 is required to be correspondingly adjusted for the twist drills with different diameters, so that the grinding efficiency is greatly reduced, the grinding quality is seriously affected due to unsuitable adjustment height, the positioning standard of the grinding machine is not required to be adjusted for the twist drills to be ground with different diameters, the clamping and positioning are simple and quick, the time consumption is less, the efficiency is high, the grinding quality of the drill is high, and the service life is greatly prolonged. The drill bit clamp adopts a simple structure of a locking tray, organically combines the drill bit fastening sleeve and the clamping piece, has the functions of connection, axial and radial guiding and force transmission, and optimizes the existing structure of the drill chuck.

The method has the further beneficial effects that: because the lower end section of the rotating sleeve is sleeved in the inner hole of the supporting sleeve, two lugs at the lower part of the supporting sleeve are hinged in corresponding hinge holes of the vertical plate of the fixed support through shaft pins, the drill bit clamp inserted in the rotating sleeve can rotate along with the shaft pins of the supporting sleeve, when the supporting sleeve is adjusted to rotate by a preset angle according to the requirement and fixed, two main cutting edges with an included angle a meeting the requirement can be ground, in order to conveniently adjust the supporting sleeve to rotate by the preset angle, scales of 110-135 degrees are marked on the casing, for example, 110 degrees are selected when the drill bit is used for drilling materials such as hard wood and aluminum alloy, 118 degrees are selected when the drill bit is used for drilling common steel, and 135 degrees are selected when the drill bit is used for drilling materials such as cast iron and concrete. The main cutting edge ground in this way accords with actual requirements better, can further improve the drilling quality of drill bit.

Still further beneficial effect is: the left positioning slide block and the right positioning slide block can be interchanged, and the two positioning slide blocks with one shape and one size can be processed, so that the processing cost is saved, the symmetry of the ground drill bit can be improved, and the positioning precision is improved. The front end of the shell is provided with the LED lamp, the front end of the upper shell is provided with the window, the positioning condition of the drill bit on the drill bit positioning device can be observed, the operation of operators is facilitated, and the positioning efficiency and accuracy are improved.

The method has the further beneficial effects that: the right end face of the front lug and the left end face of the rear lug are parallel to each other and form an included angle of 8-12 degrees with the front-rear direction, and the inner hole of the rotating sleeve is provided with an off angle of 4-8 degrees, so that the included angle between two main cutting edges of the ground drill bit meets the size requirement of a standard drill bit, the grinding quality of the drill bit is further improved, and the service life of the drill bit is prolonged.

Still further beneficial effect is: the left positioning slide block is provided with a left positioning slide block inclined surface, the right positioning slide block is provided with a right positioning slide block inclined surface, the inclination angles of the left positioning slide block inclined surface and the right positioning slide block inclined surface are matched with the helix angle of the auxiliary cutting edge (for example, an included angle of 45 degrees is preferably formed between the left positioning slide block inclined surface and the horizontal plane), the structure can be better adapted to positioning of twist drills with different diameters, universality of a grinding machine is improved, and three-dimensional positioning of two drill bit outer side tips and a front cutter surface of the drill bit is better realized.

In the above technical schemes, the main cutting edge positioning grinding device and the chisel edge positioning grinding device are designed according to the circumferential angle and the axial position of the drill bit in the drill chuck, the drill bit clamp positioned in the main cutting edge positioning grinding device is inserted, the main cutting edge of the drill bit which is clamped and positioned can just abut against the grinding wheel to grind, the drill bit clamp positioned in the chisel edge positioning grinding device is inserted, the drill bit chisel edge which is clamped and positioned can just abut against the grinding wheel to grind, and the grinding amounts of the main cutting edge of the drill bit and the chisel edge of the drill bit are determined by the axial position of the drill bit in the drill chuck. This is the same as the principle of the related art described in the background art, and will not be described in detail.

Claims (3)

1. A method of bit grinding using a universal rapid grinding machine, the universal rapid grinding machine comprising: the drilling machine comprises a shell formed by covering a bottom shell (38) and an upper shell (17), a motor (25) arranged on the bottom shell (38) and used for driving a CBN grinding wheel (27) to rotate, and a drill bit clamp, a drill bit positioning device, a main cutting edge positioning grinding device and a chisel edge positioning grinding device, wherein the drill bit clamp comprises a drill bit clamp sleeve (2), a locking tray (3) and a plurality of clamping pieces (4) which are arranged in the drill bit clamp sleeve (2) in a sliding manner, an inclined plane (4-1) at the lower part of the outer side of each clamping piece (4) is matched with the inner wall of a conical section (2-2) at the lower part of the drill bit clamp sleeve (2), the upper end of each clamping piece (4) is arranged in a corresponding clamping piece chute (3-1) at the lower end of the locking tray (3) in a sliding manner, and an annular groove (3-2) at the upper end of the locking tray (3) is in threaded connection with a downward extending side wall of the drill bit clamp sleeve (1); the drill bit positioning device comprises a positioning bracket (6) arranged on a bottom shell (38), a positioning terminal (32) fixedly arranged at the lower part of the positioning bracket (6) and used for axially positioning a drill bit (42), and a first circular ring port (6-1) matched with a drill bit jacket (2) of a drill bit clamp is arranged at the upper end part of the positioning bracket (6); a left positioning slide block (31) is arranged on the left side of the positioning support (6), a right positioning slide block (33) is arranged on the right side of the positioning support (6), a front side lug (31-1) extending rightward is arranged at the upper end of the left positioning slide block (31-1), a left positioning slide block inclined surface (31-3) is arranged at the rear side of the front side lug (31-1), a rear side lug (33-1) extending leftward is arranged at the upper end of the right positioning slide block (33), and a right positioning slide block inclined surface (33-3) is arranged at the front side of the rear side lug (33-1);

the method is characterized by comprising the following steps of:

step one: positioning and fastening of drill bits in drill bit holders

Inserting the drill clamp into the positioning bracket (6), enabling two symmetrically arranged drill clamp positioning lugs (2-1) to be clamped in corresponding first positioning bayonets (6-2), inserting the drill (42) into the drill tightening sleeve (1) and penetrating through the clamping piece (4), and separating left and right positioning sliding blocks (31, 33) on the left side and the right side by overcoming the elastic force of the sliding block driving mechanism through rotating the adjusting spanner finger (22), so that the drill (42) can continuously downwards prop against the positioning terminal (32);

after the front end of the drill bit (42) is propped against the positioning terminal (32), the drill bit (42) is stopped being pressed downwards, the drill bit (42) is in a free state, the adjusting spanner (22) is released, the left positioning sliding blocks (31, 33) are folded under the action of the elasticity of the sliding block driving mechanism, the right end face (31-2) of the front side lug is propped against one drill bit outer side tip (0-6) of the drill bit (42), the left end face (33-2) of the rear side lug is propped against the other drill bit outer side tip (0-6) of the drill bit (42), so that the drill bit (42) is driven to rotate, and when the rear side (31-4) of the right end face of the front side lug and the front side (33-4) of the rear side lug are propped against the front cutter face (0-4) of the drill bit (42), the left positioning sliding blocks (31, 33) are blocked, and the positioning is completed;

the drill bit clamping sleeve (2) is screwed downwards, so that the drill bit clamping sleeve (2) drives the locking tray (3) to descend along the guide groove, the locking tray (3) presses down the clamping piece (4), the inclined surface (4-1) of the clamping piece (4) is extruded by the inner wall of the conical section (2-2) to move inwards to clamp the drill bit (42), and at the moment, the drill bit fastening sleeve (1), the drill bit clamping sleeve (2), the locking tray (3), the clamping piece (4) and the drill bit (42) are fastened together to form a drill bit clamping whole;

step two: grinding of the main cutting edge of a drill bit

Pulling out the whole bit clamp from a positioning bracket (6), inserting the whole bit clamp into a rotating sleeve (9) of a main cutting edge positioning grinding device, enabling two symmetrically arranged bit clamp positioning convex blocks (2-1) to be clamped in corresponding second positioning bayonets (9-2), starting a dust-proof switch (7), driving a CBN grinding wheel (27) to grind one main cutting edge (0-1) of a drill bit (42) through a motor (25), and pulling out the whole bit clamp to rotate 180 degrees after grinding is completed, inserting the whole bit clamp into the rotating sleeve (9) again, and grinding the other main cutting edge (0-1) of the drill bit (42);

step three: grinding of chisel edge of drill bit

After the main cutting edge is ground, the whole drill clamp is pulled out and inserted into the fixed support (20), two symmetrically arranged drill clamp positioning convex blocks (2-1) are clamped in corresponding third positioning bayonets (20-2), the chisel edge (0-2) of the drill bit (42) is ground through the CBN grinding wheel 27, and after the grinding is finished, the whole drill clamp is pulled out and rotated 180 degrees and then inserted into the fixed support (20) again for grinding again.

2. The method of using a universal fast grinding machine according to claim 1, characterized in that:

step four: in the second step, before the two main cutting edges (0-1) are ground, the whole drill clamp is pushed to rotate along with the supporting sleeve (14) around the shaft pin (13) by a preset angle according to the requirement, and then the supporting sleeve (14) is fixed by screwing the locking knob (19), wherein the preset angle is a scale range of 110-135 degrees marked on the machine shell.

3. The method of using a universal fast grinding machine according to claim 1, characterized in that:

step five: in the second step, when the main cutting edge is ground, the rotating sleeve (9) is reciprocally rotated for a plurality of times within the range of 0-60 degrees, so that the main rear cutter surface has a preset radian, and the service life of the ground drill bit is prolonged.