CN1007794B - Apparatus for grinding twist drills - Google Patents
Apparatus for grinding twist drillsInfo
- Publication number
- CN1007794B CN1007794B CN 85104793 CN85104793A CN1007794B CN 1007794 B CN1007794 B CN 1007794B CN 85104793 CN85104793 CN 85104793 CN 85104793 A CN85104793 A CN 85104793A CN 1007794 B CN1007794 B CN 1007794B
- Authority
- CN
- China
- Prior art keywords
- emery wheel
- grinding face
- grinding
- drill
- guiding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Abstract
The present invention relates to a device for grinding a twist bit. A grinding wheel can axially move on a driving shaft and is pushed to a drill guide structure by a spring. The guide structure comprises a plurality of guiding channels, at least one guiding jaw, a drill stopping device and a supporting seat, wherein the guiding channels guide drills with difference diameters to a grinding surface; the one guiding jaw extends into a chip output slot of a drill; the drill stopping device limits the drill to move to the grinding wheel with elastic deformation; the hardness ratio of the supporting seat is larger than the hardness ratio of the grinding wheel, the supporting seat has a supporting surface which is parallel to a grinding surface and is engaged with the grinding surface, and a limiting spring on the end of the grinding surface, which is nearer the guide jaw than the stopping device pushes the grinding surface to the guiding structure. The grinding wheel can not change the position of the grinding wheel relative to the guiding structure by abrasion and the grinding surface can approximately restore to an original shape in irregular abrasion because of the supporting seat.
Description
What the present invention relates to is a kind of device of grinding twist drills, and this spiral bit has two back and with each spiral flute that interrelates later; This device includes: a rotating driving shaft, an emery wheel, drill guide structure and drill bit stopping means; Emery wheel has a grinding face, and is to install with being axially moveable and be connected on the described driving shaft, and makes its deflection drill guide structure by spring; The drill guide structural plane is towards said grinding face, and its some guiding channel of having diameter to have nothing in common with each other, they are suitable for respectively the described grinding face of a kind of guiding in the spiral bit of different-diameter, locate in a back of this spiral bit with till its joint until grinding face, and this drill guide structure also has a guiding projection at least with each described guiding channel alignment, and it is used for putting in its flute when spiral bit inserts this described guiding channel; The drill bit stopping means is used for when a spiral bit extends through described guiding channel, fits so that limit described this spiral bit again to spring loaded grinding wheel movement with it at another place, back.
From United States Patent (USP) 3753320 and the German application 1652239 delivered, known this without chuck just clamp can the abrasive drilling head device.
On this known devices, arranged an adjustable bearing, it acts on one and is rigidly attached between parts on the emery wheel mounting structure and the drill guide structure so that than the tip position place restraining spring of the more close guiding projection of drill bit stopping means grinding face is pushed to the motion of drill guide structure at grinding face.
Can whether that back that drill bit is grinding suitably realize satisfactory results for grinding operation with respect to the position of grinding face is vital, the radial position of guiding projection with respect to guiding channel will be depended in this position, and because the spiral flute of spiral bit, also depend on distance from the guiding projection to the drill bit stopping means, this distance must be little, not so, the helical angle difference of the flute of the fluted drill of different manufacturers production will cause the back of some fluted drill too to depart from correct position for grinding face.
A shortcoming of described this known devices is: the axial distance from grinding face to the guiding projection will strengthen along with the wearing and tearing of said grinding face, and drill bit is touched fully less than emery wheel.So this suitable distance must be readjusted by means of adjustable bearing.Because the axial distance between guiding projection and the drill bit stopping means is very little, so said drill bit stopping means is adjusted and incorrectly may be caused emery wheel to be ground to the drill guide structure and damage the guiding projection.
When another shortcoming of this known devices occurred in the drill bit of long-time mill minor diameter, because bit diameter is little, when emery wheel turned around, drill bit did not reach whole grinding face, will form a groove, the place of this shortcoming that Here it is like this on grinding face.When regrinding a larger-diameter spiral bit thereafter, this groove will reflect by the back of grinding, and just reflects by the cutting limit of these a little bigger drill bits; And such groove is when reaching certain size, and this emery wheel just can not have been used again.
The purpose of this invention is to provide the sort of device that a kind of top beginning is spoken of.The suitable distance between grinding face on this device and guiding projection and the original form of grinding face will be maintained automatically, and have got rid of emery wheel and damaged the situation of guiding projection.
According to the present invention, this purpose has realized with following manner: emery wheel has one at least with its associated bearing, and the material of this bearing is also bigger than the material hardness of emery wheel.For example, make by a kind of hard metal or cermet material resemble the carbide alloy; Said this bearing is in the drill guide structure, it has parallel with grinding face and can fit with a grinding face seating plane, arranges this seating plane to be used for causing than drill bit stopping means restraining spring on the nearer tip position of guiding projection at grinding face the motion of grinding face.
In this device, although abrasion of grinding wheel, the distance between each guiding projection and the grinding face still remains constant, and has got rid of the situation that emery wheel damages the guiding projection that takes place.
No matter when, as long as spiral bit withdraws from the drill bit stopping means, the emery wheel that is rotating will be shifted onto on the bearing by spring force, and emery wheel is worn in the contact with said bearing, makes its grinding face shape take the shape that conforms to bearing.If bearing is at least equally wide with grinding face, look the length of this wearing-in period, grinding face can return to its original shape more or less.
In view of above-mentioned, another object of the present invention be above will providing the sort of device spoken of of beginning on this device, be provided with a device emery wheel that is rotating is returned to needed grinding face shape, this recovery is carried out after spiral bit withdraws from the drill bit stopping means, and can when spiral bit is grinding, carry out, make grinding face can constantly remain on ideal form like this.
This purpose realizes in the following manner: connecting the many bearings that can fit with grinding face on the drill guide structure rigidly, they are distributed on the circumference of grinding face, and emery wheel is installed to such an extent that make its axially activity and can be with respect to this inclination on said axle.
On such device, the back less than on fitting with the drill bit stopping means of a drill bit that is grinding will not be pressed towards grinding face, the emery wheel of spring biasing does not just reach from the nearest bearing of spiral bit like this, and emery wheel is still pressed at diametric(al) that bearing facing to drill bit by spring, and the process medium plain emery wheel at the mill fluted drill will constantly return to needed shape like this.
In the device that includes an emery wheel carriage, the emery wheel carriage is connected on the emery wheel rigidly, and it has one with the coaxial hole of emery wheel; Emery wheel highly precisely remains on the center, within the scope of the present invention, if the emery wheel carriage has only very little thickness adjacent with said hole, and the diameter of axle also than said hole slightly hour, can allow emery wheel is mounted to inclination.In such device, if have at least a coupling arm to be non-rotatably connected on the axle, and parallel with axle approx, and its angle puts in the eccentric openings of emery wheel carriage swingably, guaranteed like this to rotate to pass to emery wheel from axle and also kept the accurate center of emery wheel height simultaneously.
Have the people and understand non-hard to sayly, these bearings can turn the edge of the sand grains on the grinding face, and their abrasive action is descended.In fact, can prove that such turning the edge of takes place very rapidly, but also can prove that when blunt like this grinding face was used for abrasive drilling in different bearings contacts, it was very fast sharp again.
In the category of the present invention, if the radial dimension of grinding face and seating plane greater than this device guiding channel the required size of spiral bit of receptible maximum, and this radial dimension is lower than the back of grinding of fluted drill and is pressed onto contact pressure between the grinding face on the said back by spring to the radially contact pressure between the amplifier section that makes grinding face and seating plane greatly, at this moment grinding face just can be in process of lapping resharpen.
In such device, that part of grinding face that fluted drill contacted that is grinding is faster than the wearing and tearing of the remainder of grinding face, and this part grinding face does not just reach bearing like this, and is done sharp again, along with the continuation of grinding, and keeps it sharp.Verified, if the size of said radially amplifier section is selected suitablely, the grinding face distortion that takes place in the process of mill is negligible, and can influence the effect of mill hardly.
Usually, bearing is to be made by hard metal or the cermet resemble the carbide alloy, and hard metal and cermet are at same corundum (aluminium oxide), and its wearing and tearing are little of ignoring in the emery wheel of the doing contact, to said this spiral bit here, the emery wheel of usefulness all is that corundum is done usually.
Empirical evidence, also can provide satisfied abrasion of grinding wheel and seat wear ratio even the difference between the abrasive hardness of hard metal and emery wheel sand grains is very little, in general, bearing must be made of the material higher than emery wheel hardness, can remain on intensity on the grinding face to sand grains and the hardness of emery wheel is exactly bonding additive.
Bearing also can be made of the material beyond hard metal and the cermet, do as a polycrystalline diamond (granule diamond) or a cube crystallization boron nitride, the bearing made from such material can use together with the emery wheel that be added with the harder abrasive material of ratio corundum resemble carborundum.
Fig. 1 is the longitudinal sectional drawing of looking in the I-I ' plane from Fig. 2, and it shows specific implementation device of the present invention.
Fig. 2 is the top view of looking in Fig. 1 arrow A direction, and it shows the drill guide structure.
Fig. 3 is a zoomed-in view, and it shows a pair of guiding pawl.
Fig. 4 shows the head of common spiral bit.
Fig. 5 is the top view that Fig. 4 fluted drill head is shown.
Fig. 6 is the local longitudinal sectional drawing of an amplification, and it shows in the described device of Fig. 1 near the drill guide structure of a guiding channel and the various piece of emery wheel.It also shows the spiral bit that inserts described guiding channel, and it just is being crushed on the drill bit stopping means.
Fig. 7 is a profile that is similar to Fig. 6, and just it shows near the structure the bearing on the spiral bit next door of inserting.
Fig. 8 is a profile that is similar to Fig. 6, but it shows and inserts near the structure of fluted drill bearing relative on the diametric(al).
Come more detailed description a kind of illustrative specific implementation of the present invention referring now to figure.
Referring to Fig. 1, driving shaft 1 has a prolongation one pivot 2, and this pivot is suitable for being clipped on the chuck of unillustrated drilling machine on the figure.
The emery wheel 3 of a hollow, it is by an inner face of being made up of the face of cylinder and grinding face.Grinding face comprises a ring-type grinding face part 4a, and it is corresponding to the plane of an imagination, the same conical intersection with its coaxial imagination in the face of cylinder of the above on this imagination plane.The radial width of this grinding face 4a equals or is slightly larger than the radial width of the back 5 of maximum spiral bit, this maximum spiral bit refer to the drill guide structure any one guiding channel the spiral bit of receptible maximum, this point will be spoken of below.The outside of the facial 4a of grinding has a ring-type grinding face part 4b to be close to it, and 4b with the face of cylinder at an angle of 90.
Emery wheel 3 is bonded on the emery wheel carriage 6, and this carriage has a hole 7 coaxial with emery wheel, and in present this specific implementation, this hole has only very little axial length, because the axial dimension of this emery wheel carriage is also very little.Axle 1 extends through hole 7, and its diameter is slightly smaller than hole 7, and like this, it is axially movable that emery wheel 3 is contained on the axle 1, and is tiltable with respect to axle 1.
A Connection Element 8,11 comprises a cup-like portion 8, and it has a centre bore therefrom to pass for axle 1.Cup-like portion 8 is clamped between snap ring 9 and the nut 10, thereby it is clamped on the axle 1.This snap ring is clamped on the axle 1, and nut matches with the threaded line of axle on 1, is tightened on spool 1.This Connection Element also comprises two pitman arms 11, and they protrude upward from the cup edge, and coaxial parallel, extend through the eccentric orfice 12 on the grinding face carriage 6 respectively with a gap.
Driving shaft 1 is installed in rotation on the drill guide structure by means of a ball bearing assembly 13, and this drill guide structure comprises the element 14 to 18 of rigidity interconnection.
Guiding pawl seat 15,16 is made up of two flat boards 15 and 16, and they are that rigidity interconnects.Have hole 20 on dull and stereotyped 15, align with separately guiding channel 19 in these holes, and its diameter equals the diameter of corresponding guiding channel 19.Plate 16 porose 21 aligns with their corresponding holes 20.Each hole puts in two guiding pawl 23(Fig. 3 for 21 li), these guiding pawls are to arrange like this, when spiral bit passes corresponding guiding channel 19, the guiding pawl just puts in this spiral bit flute separately with having angular clearances slidably and, each guiding pawl 23 has two edge surfaces 24 on relative sagittal plane, when spiral bit puts in corresponding guiding channel 19 and when guiding is passed between the pawl 23, these edge surfaces just limited this drill bit in the clockwise direction with counterclockwise rotation. Guiding pawl seat 15,16 also has a claw or flange 25, and it puts in the mating groove 26 on the underframe 14 to overhanging, to guarantee to guide hole 20 and 21 on the pawl seat 15,16 with separately guiding channel 19 alignment (Fig. 2) on the underframe 14.
Drill bit stopping means 18 is frustoconical, and the outer confined planes of a taper is arranged.
Four bearings 17 can fitting with emery wheel 3 are to be welded on the guiding pawl seat 15,16, and these four bearings are particularly made by carbide alloy by the material higher than the abrasive hardness of emery wheel 3.These bearings 17 are facing grinding face 4a, 4b and are being distributed in (Fig. 1,2,7 and 8) on its circumferencial direction regularly.Each bearing 17 all has seating plane 17a, and 17b.Seating plane 17a is facing to the grinding face of 4a part, and parallel with it, and seating plane 17b is facing to the 4b part of grinding face, and parallel with it.Seating plane 17a and 17b are axially from little than the confined planes of drill bit stopping means 18 of the distance of guide pins 23.
27 1 on a spring is pressed in the bottom of Connection Element 8,11, and its other end is pressed on the emery wheel carriage, the seating plane 17a that it pushes the grinding face part 4a of emery wheel 3,4b to bearing 17 respectively, 17b.Grinding face 4a, 4b is when fitting with bearing 17, just than the more close guiding pawl 23 of the confined planes of drill bit stopping means 18.
Above-described this specific implementation has following working method: axle 1 prolongation pivot 2 is sticked in the chuck of a hand-operated electric drill bed and go, hold handle 14c with one, start drilling machine then, like this, the rotation of chuck is by axle 1, and Connection Element 8,11 and emery wheel carriage 6 pass to emery wheel 3.The spiral bit that will grind with the another handgrip advances the narrowest guiding channel that can admit this drill bit to go for 19 li, movable this drill bit makes between its guiding pawl 23 that puts in described guiding channel 19, till a back 5 of described spiral bit is pressed onto on the drill bit stopping means 18.Then, make this spiral bit between the edge 24 of guiding pawl 23, make angular oscillation several times.This spiral bit is axially withdrawed from the pawl 23 from guiding again, turn over 180 ° and repeat another back 5 that step described above is ground this drill bit, this back is originally with 18 contacts of drill bit stopping means.Repeat these two described above and grind circulation, till this drill bit grinds as desired.Turn off drilling machine then.
Like this, this spiral bit just has been ground to practice with one heart and has gone up in the satisfied tolerance, and its back is ground to such an extent that make this spiral bit that suitable relief angle 28(Fig. 4 be arranged) and desirable chisel edge angle γ (Fig. 5).If wish to have bigger relief angle 28 etc., can inject a slightly bigger guiding channel 19 to this spiral bit that will grind.
In the grinding operation process, be not pressed in bearing 17(Fig. 7 that drill bit back 5 on the drill bit stopping means 18 forces spring loaded emery wheel 3 to leave to rely on recently with it), and emery wheel 3 is still being pressed by spring 27, like this, those roughly in diametric(al) with the spiral bit that a grinding toilet vis-a-vis with emery wheel 3 contacts, at this contact medium plain emery wheel 3 be worn (Fig. 8).Thereby in whole grinding operation process, grinding face 4a, 4b will constantly return to its original shape.
By obviously finding out on this figure, the wearing and tearing of emery wheel 3 can not change from grinding face 4a, and 4b is to the distance of guiding pawl 23, and until at last, emery wheel carriage 6 has been run into and is clamped on stopping on the driving shaft 1 and encircles 30.In this case, emery wheel must have been changed.
In order to prevent that bearing 17 from turning the edge of the sand grains of grinding face 4a part, can suitably select the radial width of grinding face 4b part and the area of each seating plane 17, make the contact pressure in grinding between said 4b and the 17b a little less than the contact pressure between the back 5 of the receptible maximum drill bit of grinding face 4a part and this device institute, the latter partly produces when overcoming the power of spring 27 when described drill bit being pressed to grinding face 4a.At length explained above, in this case, yet with the grinding face part 4a of spiral bit contact in grinding by mill sharp this will cause grinding face part 4a that deformation takes place, as sentencing exaggerative size illustrates 29 among Fig. 6 to Fig. 8; If the radial width of grinding face part 4b and the area of seating plane 17b select suitablely, this distortion almost can not be discovered.
Narrated a kind of illustrative specific implementation of the present invention above, but the present invention never only limits to this specific implementation.For example, the illustrative specific implementation of this that introduced can be designed as the annex of a hand-held drilling machine.On the other hand, the present invention can specific implementation be the autonomous device that has a motor also.
Can believe, if with the grinding face of spiral bit contact with about 3 meters to the 30 meters superficial velocity rotation of per second, all satisfied to effect with regard to the effect of grinding face with regard to emery wheel to the abrasive action of fluted drill and bearing; When optimum efficiency occurs in the superficial velocity of 20 meters of about per seconds, be approximately the emery wheel of 80mm for external diameter, said superficial velocity corresponding to speed in about 700 to 7000 rev/mins of scopes, perhaps corresponding to 5000 rev/mins of optimum speeds.
Claims (6)
1, be used for grinding two back and two devices with the spiral bit of this flute that links later, it comprises:
A rotating driving shaft,
An emery wheel, it has the grinding face of a ring-type to be positioned on described axle to go up and can do axially-movable thereon, and it connects with described axle is in order to rotate it by this axle,
A drill guide structure, it is axially separating with described grinding face, also has a spring assembly of said emery wheel being pushed to said drill guide structure;
Described drill guide structure has been determined the guiding channel that many diameters that are distributed at circumferencial direction have nothing in common with each other, these guiding channel openings are at two, one with grinding face separately and towards grinding face, and the other end, in them each all is suitable for accepting a spiral bit, said spiral bit is on the position that touches described grinding face, and what touch is at that part of grinding face that axially faces toward described guiding channel
With each described guiding channel alignment, in one the above-mentioned place near it, described drill guide structure has at least a guiding projection to be suitable for putting in the described flute of the spiral bit that inserts described guiding channel,
Described drill guide structure comprises the drill bit stopping means, it has some confined planes parts, they are axially aliging with described guiding channel respectively and towards it, this confined planes part is fitted with another back of the spiral bit that stretches into relevant guiding channel, moves to described grinding face to limit said spiral bit.
It is characterized in that: be connected to a rare bearing with emery wheel, this bearing is to be made as hard metal or the cermet resemble the carbide alloy by the material bigger than emery wheel material hardness, and described bearing is positioned at the drill guide structure, it has a seating plane that is parallel to grinding face and can fits with grinding face, this seating plane is used for limiting grinding face and is being pushed away by spring a tip position and move, in this tip position, described grinding face is than the more close guiding projection of drill bit stopping means.
2, device as claimed in claim 1, it is characterized by, said drill guide structure comprises many circumferential bearings, each bearing all has seating plane, and described emery wheel is contained on the described axle and can makes described grinding face not reach a said seating plane inclined position at least to one.
3, device as claimed in claim 2, be applied to such device, said therein emery wheel by an emery wheel bracket support, and connect together with it un-rotatably, and said emery wheel carriage has one with the coaxial through hole of said emery wheel, it is characterized by, said driving shaft play is arranged passes described through hole and with described emery wheel carriage connection the latter is rotated.
4, device as claimed in claim 3 is characterized by, and said emery wheel carriage has a little axial width near described through hole.
5, device as claimed in claim 3, it is characterized by, said emery wheel carriage has an eccentric orfice at least, it is roughly parallel to described through hole, and described driving shaft is being with a linking arm at least, this arm is to be connected on the described driving shaft un-rotatably and with its almost parallel, this arm can stretch in the described hole with rocking.
6, device as claimed in claim 2, it is characterized by, this installs the needed radial dimension of any one guiding channel receptible maximum spiral bit of institute to the radial dimension of grinding face and seating plane greater than mill, and described radial dimension is lower than back that drill bit grinding and is pressed onto contact pressure between the grinding face on the described back by spring to the radially contact pressure between the amplifier section that makes grinding face and seating plane greatly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85104793 CN1007794B (en) | 1985-06-22 | 1985-06-22 | Apparatus for grinding twist drills |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85104793 CN1007794B (en) | 1985-06-22 | 1985-06-22 | Apparatus for grinding twist drills |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85104793A CN85104793A (en) | 1986-12-17 |
| CN1007794B true CN1007794B (en) | 1990-05-02 |
Family
ID=4794067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85104793 Expired CN1007794B (en) | 1985-06-22 | 1985-06-22 | Apparatus for grinding twist drills |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1007794B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102941513B (en) * | 2012-11-20 | 2015-03-18 | 丹阳市盛力机械有限公司 | Combined grinding machine for notches and double clearance angles of twist drills |
| CN114789367A (en) * | 2022-04-13 | 2022-07-26 | 浙江嘉宏工具制造有限公司 | Positioning method of twist drill |
-
1985
- 1985-06-22 CN CN 85104793 patent/CN1007794B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85104793A (en) | 1986-12-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4169739B2 (en) | Method and apparatus for grinding rotationally symmetric mechanical parts | |
| US5400546A (en) | Precision twist drill sharpener/point splitting machine | |
| US6726544B2 (en) | Method and apparatus for superfinishing tapered roller bearing | |
| CN1035721C (en) | Roundness processing method and its device for slipper surface of rocker arm | |
| CN1233991A (en) | Collet chuck device | |
| EP0614716A1 (en) | Mandrel for processing workpiece with internal spline | |
| US4798024A (en) | Method and apparatus for deburring the inner edge of part of a workpiece | |
| US5957632A (en) | Tool position correcting device | |
| CN1007794B (en) | Apparatus for grinding twist drills | |
| CN110328564B (en) | Milling cutter grinding device and using method | |
| US2805522A (en) | Apparatus for sharpening wood bits | |
| CN1657232B (en) | Centreless grinding method and centreless grinder | |
| CN212169966U (en) | Multifunctional grinding machine | |
| US4858389A (en) | Apparatus for grinding twist drills | |
| CN201824223U (en) | Grinding wheel extension bar for universal tool grinder | |
| JPS63212451A (en) | Grinding/polishing/cleaning for pipe end inner face | |
| US4109420A (en) | Grinding machine, particularly for rollers of rolling element bearings | |
| CN110978295A (en) | Milling device and wet spraying machine | |
| US4092902A (en) | Lathe attachment for generating spherical surfaces | |
| CN219901564U (en) | Grinding wheel dresser of bearing outer ring groove grinding machine | |
| JP2676054B2 (en) | Method and apparatus for modifying a grinding wheel for engine valve grinding in a centerless grinding machine | |
| RU2201331C2 (en) | Flexible embracing abrasive tool for working eccentric shafts and screws | |
| EP0270117A2 (en) | Quick-change lens tool | |
| CN108723852B (en) | Workpiece machining clamp | |
| US2933801A (en) | Apparatus for producing a smooth turned surface |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |