EP0046440A1 - Dispositif pour détalonner à la meule des forets - Google Patents

Dispositif pour détalonner à la meule des forets Download PDF

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Publication number
EP0046440A1
EP0046440A1 EP81730073A EP81730073A EP0046440A1 EP 0046440 A1 EP0046440 A1 EP 0046440A1 EP 81730073 A EP81730073 A EP 81730073A EP 81730073 A EP81730073 A EP 81730073A EP 0046440 A1 EP0046440 A1 EP 0046440A1
Authority
EP
European Patent Office
Prior art keywords
drill
grinding
angle
point
contact
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.)
Withdrawn
Application number
EP81730073A
Other languages
German (de)
English (en)
Inventor
Karl H. Giebmanns
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Herbert Lindner GmbH
Original Assignee
Herbert Lindner GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Herbert Lindner GmbH filed Critical Herbert Lindner GmbH
Publication of EP0046440A1 publication Critical patent/EP0046440A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • B24B3/26—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills of the point of twist drills

Definitions

  • the invention relates to a relief grinding device for drills according to the preamble of claim 1.
  • This device is intended to grind drill tips in order to form an relief grinding angle, a cutting bit angle and a tip angle in the desired shape.
  • -Drills are sometimes made with a very general tip design but without any special tip angle, relief grinding angle or cutting bit angle and delivered to the user. It is then in the responsibility literalness of the user to form these angles on the drill in accordance with the intended use.
  • One user may find a specific ratio required for the angles at the tips of his drill to do a certain job, while another user may need a completely different combination of angles at the tips of his drills for entirely different purposes.
  • Drills that have already been supplied by the manufacturer to the user with the required combination of angles are worn out or damaged after a certain period of use. In such cases, it is almost too expensive to throw away the drills. It is less time-consuming and sometimes easier to regrind the drills to restore them to their original state or to change a desired tip formation. This is particularly the case in large manufacturing companies where the replacement of drills can cause unusually high costs.
  • the invention has for its object to provide a relief grinding device of the generic type, which enables the positioning of the drill to be ground, while it is held in a relatively fixed position.
  • the solution to this problem results from the characterizing features of claim 1.
  • the position of the drill is preferably in the vertical.
  • the drill and the grinding surface become straight relative to each other Lines are moving, with the drill itself retained in its relatively fixed position to avoid compound movements and intricate mechanisms that tend to fail and often create undesirable angles.
  • An advantage of the invention is the simplicity of the device for regrinding drill bits, which facilitates the use of simple designs that have a long service life. This results in increased effectiveness during processing, the device according to the invention being easy to use and less causing breakdowns.
  • the present invention is completely different from the prior art in that it teaches one another how to keep the grinding wheel and the drill bit in relatively firm positions.
  • the drill tip and the grinding wheel are moved relative to each other for the purpose of grinding contact with each other during the grinding work.
  • the only other movement performed is the rotary movement of the drill during grinding. Consequently, the invention teaches a relatively simple sequence of steps for performing the point grinding of a drill.
  • the drill tip When sharpening a twist drill 12 in a relief grinding device, the drill tip is given a tip angle 14 (FIG. 7), a relief grinding angle 16 (FIG. 8) and a cutting bit angle 18 (FIG. 9) with a cutting edge 20.
  • the combination of the angles 14, 16, 18 is formed by using a grinding wheel 22 which is operated by means of a drive motor (not shown) and which rotates about its axis of rotation 24 (FIGS. 1, 2 and 6).
  • the grinding wheel 22 is provided with a beveled grinding surface 26 which is beveled at a certain angle.
  • the selection of the helix angle of the grinding surface 26 determines the included tip angle 14, which is generated at the end of the drill 12 by grinding (FIG. 7). If any surface of the drill 12 is ground by grinding contact with the chamfered grinding surface 26, the end of the drill 12 assumes the angular dimensions selected for the bevel of the grinding surface 26.
  • the grinding wheel 22 rotates in a given plane.
  • the axis of rotation 24 of the grinding wheel 22 is horizontal.
  • the drill 12 to be ground can also be positioned and held in the same plane for grinding contact with the grinding surface 26.
  • the plane of the grinding wheel 22 is not limited to the vertical as long as the grinding wheel 22 and the drill 12 are in the same plane.
  • the rear grinding device comprises a clamping device -10 for the drill 12, which has a housing 28 which is essentially circular and which has a carrier 30 which forms part of the housing 28.
  • An indexing sleeve 32 and a bearing sleeve 34 are arranged within the housing 28.
  • Each of the two bushes is arranged inside the other and enclosed in a circle.
  • the bearing bush 34 has an inner receiving bore which is of sufficient diameter to accommodate a drill 12 to be ground.
  • the grooves of the drill 12 are in a suitable position within the bore of the bearing bush 34 by using a pin or an ent remote adjusting screw 36 arranged.
  • the index sleeve 32 includes a similar pin or adjustment screw 38 which is similar to the adjustment screw 36 for the purpose of indexing the bearing sleeve 34 to thereby cause the cutting edge 20 to be properly positioned with respect to a selected grinding point on the grinding surface 26 of the grinding wheel 22 is arranged.
  • the bearing bush 34 is provided with two diametrically opposite bores or index bores 40, each of which is optionally penetrated by the adjusting screw 38 (FIG. 2).
  • the index sleeve 32 is provided with a central receiving opening for receiving the shank of the drill 12, the depth of the receiving opening is optional and only depends on the length of the drill 12, which must be suitable to be inserted into the holder.
  • the index sleeve 32 is rotatably mounted inside the housing 28 and extends outside the same for a reciprocating movement (double arrow 42 in FIG. 2) and for a rotational movement inside the housing 28 and relative to and around its axis in of a type caused by driven gear 44.
  • the index sleeve 32 is acted upon and normally pressed downwards in a direction by a spring 46 which is supported between the carrier plate 30 and the driven gear 44.
  • the lower end of the index bushing 32 is provided with a bearing formation 48 in order to enable a smooth reciprocating, essentially friction-free sliding contact with an adjustable cam or a displacement ramp 50.
  • the cam 50 is shown in principle and is articulated at one end 52 and is adjustably supported at its other end 54 by means of a tensioning screw device which is operated manually in order to set a desired inclination of the cam or ramp.
  • a support block 56 (Fig. 1) is rotatably attached to one side of the housing 28 and rotatably receives a shaft 58 which carries at its lower end a large drive gear 60 which is in contact with the smaller driven gear 44.
  • the shaft 58 rotates within the cam 50 and is forced to rotate by its connection at its lower end to a rotatably mounted arm 62.
  • the arm 62 is guided within a two-bar yoke 64.
  • the yoke 64 is only shown such that it is attached to the base plate 66 of the device.
  • the yoke 64 is provided with bow-like pins which engage within a series of receiving bores 68 so as to adjust the yoke 64 in positions along and to allow relative to the length of the arm 62 to hereby define the pivot point of the arm 62.
  • a carrier 70 (FIG. 2) which in a suitable manner carries an actuating device 72 which consists of a hydraulic or pneumatic cylinder-piston unit.
  • the actuator 72 comprises a double acting piston 74 with a piston rod 76 which can be moved in opposite directions (double arrow on the piston rod 76).
  • Suitable conduits 78 for the fluid are provided to ensure the reciprocating flow of gas or liquid in and out of the cylinder of the actuator 72.
  • the drill 12 is held in a fixed vertical position in the carrier 30, its axis lying in the vertical plane of rotation of the grinding surface 26 and being at least parallel to an imaginary line 88 which is drawn vertically through the axis of rotation 24 of the grinding wheel 22 is.
  • the drill 12 intersects particular predetermined lines of motion. Accordingly, when the actuator 72 is actuated so that the piston rod 76 (FIG. 2) is moved to the right, the carrier and the drill 12 are also moved to the right. This causes the bearing boss 48 at the lower end of the index sleeve 32 to run upward along the cam 50 while the wearer is making his forward grinding stroke movement to the right. The result is that the drill 12 is inside the carrier opposite to the normal, downward force of the spring 46 is raised.
  • the carrier block 56 which is attached to the housing 28, moves the housing 28 and consequently moves the drive gear 60 connected to it.
  • the drive gear 60 rotates about the axis of the shaft 58 transferred to the driven gear 44, which in turn rotates the index sleeve 32 and thus the drill 12 in the direction of arrow 79 (FIG. 6 and arrows in FIGS. 3, 4 and 5).
  • the arc angle of the rotary movement of the drill 12 is variably adjustable by adjusting the position of the yoke 64. 3 and 4, the arc angle of rotation is less than when the yoke 64 is moved closer to the axis of the gear 60 (Fig. 5).
  • the relief grinding device makes use of the need to design drills with optionally different relief grinding angles 16. In the prior art, this was accomplished by various structures that included swinging the drill end around its tip. Such training was complicated and cumbersome.
  • the present invention teaches the placement of the drill 12 in a fixed position so as to avoid causing it to become un is subjected to regular swinging motion.
  • the relief grinding device according to the invention teaches the possibility of selecting the relief grinding angle to be ground and formed on the drill tip by moving the drill relative to the grinding surface 26 and for an optional contact contact with a grinding point 82 on the grinding surface 26, which is a selected arc distance from the dead center or an imaginary one Line 88 is removed.
  • the rear grinding device comprises the adjustable comb or adjustable ramp 50.
  • the relief grinding angle 16 is optionally set and can be changed by adjusting the surface inclination of the cam 50. Since the drill is moved in a tangential direction to the grinding surface, its movement path is controlled by the position of the cam 50, which shifts the end of the drill in its axial direction. The tangential movement path 18 of the drill end is parallel to the angle of the comb 50 (FIG. 2). During its movement, the end of the drill comes into contact with the grinding surface at grinding point 82 at the same point. This point is marked by selected the angle of the cam 50.
  • the relief grinding angle 16 to be ground on the drill 12 becomes larger if the grinding point 82 is an arcuate distance away from the dead center line 88 than if the point 82 is closer to the line 88.
  • adjustable raising or lowering of the cam 50 the point 82 of the sliding contact between the end of the drill 12 and the grinding surface 26 can be selectively adjusted.
  • the drill 12 is positioned vertically within its receptacle by its location in the sleeves 32 and 34.
  • the pin 36 is secured in a groove of the drill 12 in such a way that the cutting edge 20 is perpendicular to the preselected grinding point 82 in the circle of contact between the drill 12 and 82. This ensures that the cutting edge 20 is appropriately ground and shaped at the moment the cutting edge 20 contacts the grinding point 82.
  • the presetting of the grinding point 82 is carried out in accordance with the requirement of the relief grinding angle 16, which is to be ground on the drill 12.
  • the cam 50 is raised or lowered to set the precise point 82 of contact of the drill 12 with the grinding surface 26.
  • the angular dimensions of the bevel of the grinding surface 26 are preset in accordance with the tip angle 14 to be formed on the drill 12.
  • the helix angle is half of the included tip angle 14 if both sides or surfaces 84 of the drill 12 have to be ground with the same angle.
  • the actuating device 72 is actuated so that the piston 74 and its piston rod 76 are moved in the direction to the right to their forward grinding stroke. Since the carrier 30 is moved in the direction of the increasing inclination of the cam 50, the held and positioned drill 12 is raised in the direction of the beveled grinding surface 26, namely along the tangential path 80, which corresponds to the angle of displacement by the cam 50 and is parallel to it.
  • the index sleeve 32 is rotated by the engagement of the gears 44 and 60.
  • the set arrangement of the yoke 64 along the adjusting arm 62 adjusts the angle of rotation of the gear wheels 44 and 60 (FIGS. 4 and 5) Gear 44 to, with the same stroke or the same movement of the piston rod 76.
  • the yoke 64 is set closer to the axis 58 than is the case for surfaces with a smaller arcuate extension.
  • the adjustment must only be sufficient to ensure that the grinding operation covers the full extent of the standing surfaces of the drill 12.
  • the configurations of the tip angle 14, the relief grinding angle 16 and the cutting bit angle 18 become incomplete.
  • the drill 12 When the cutting edge 20 comes into sliding contact with the point 82, the drill 12 has already performed an arcuate pivoting movement. After the cutting edge 20 is ground, the following part of the surface 84 is also ground, namely while it is rotatingly in contact with the grinding point 82. Simultaneously with the rotary movement of the drill 12, this is continuously moved in the direction of the grinding point 82 and upwards along the cam 50. This composite line and rotational movements of the drill 12 ensure the complete point grinding and the formation of the one surface of the drill end.
  • the released sleeve 34 is then rotated until the other index hole 40 matches the pin 38, which is then securely inserted into the index hole 40.
  • the bores are arranged at the same distance around the index sleeve 32.
  • the drill 12 comprises two surfaces 84, consequently there are two corresponding holes 40.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP81730073A 1980-08-18 1981-08-14 Dispositif pour détalonner à la meule des forets Withdrawn EP0046440A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803031427 DE3031427A1 (de) 1980-08-18 1980-08-18 Hinterschleifvorrichtung fuer bohrer
DE3031427 1980-08-18

Publications (1)

Publication Number Publication Date
EP0046440A1 true EP0046440A1 (fr) 1982-02-24

Family

ID=6110039

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81730073A Withdrawn EP0046440A1 (fr) 1980-08-18 1981-08-14 Dispositif pour détalonner à la meule des forets

Country Status (3)

Country Link
EP (1) EP0046440A1 (fr)
JP (1) JPS5761450A (fr)
DE (1) DE3031427A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0521313Y2 (fr) * 1987-12-02 1993-06-01
JP6136970B2 (ja) * 2014-02-13 2017-05-31 トヨタ自動車株式会社 工具保持台

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE53956C (de) * L. SCHMIDT in Offenbach a. M Schleifvorrichtung für Bohrerspitzen
US2815610A (en) * 1953-07-13 1957-12-10 Henry S Siemsen Twist drill point grinder
US2870579A (en) * 1955-02-28 1959-01-27 Henry S Siemsen Automatic grinding machine for spiral drills
CH462653A (de) * 1965-03-04 1968-09-15 Ahlstroem A Apparat zum Schleifen von Bohrern
CH474329A (de) * 1967-10-24 1969-06-30 Steinmetz Werner Bohrerschleifvorrichtung, insbesondere für Spiralbohrer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040480A (en) * 1959-05-25 1962-06-26 Winslow Product Engineering Co Drill pointer
DE1502542B1 (de) * 1965-04-13 1970-05-14 Lock Louis Henson Spiralbohrerhaltevorrichtung zum Schleifen der beiden Bohrerschneiden

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE53956C (de) * L. SCHMIDT in Offenbach a. M Schleifvorrichtung für Bohrerspitzen
US2815610A (en) * 1953-07-13 1957-12-10 Henry S Siemsen Twist drill point grinder
US2870579A (en) * 1955-02-28 1959-01-27 Henry S Siemsen Automatic grinding machine for spiral drills
CH462653A (de) * 1965-03-04 1968-09-15 Ahlstroem A Apparat zum Schleifen von Bohrern
CH474329A (de) * 1967-10-24 1969-06-30 Steinmetz Werner Bohrerschleifvorrichtung, insbesondere für Spiralbohrer

Also Published As

Publication number Publication date
DE3031427C2 (fr) 1987-01-22
JPS5761450A (en) 1982-04-13
DE3031427A1 (de) 1982-03-04

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19820813

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Effective date: 19831026

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GIEBMANNS, KARL H.