EP0665084B1 - Machine pour affûter des outils de brochage - Google Patents

Machine pour affûter des outils de brochage Download PDF

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Publication number
EP0665084B1
EP0665084B1 EP95100393A EP95100393A EP0665084B1 EP 0665084 B1 EP0665084 B1 EP 0665084B1 EP 95100393 A EP95100393 A EP 95100393A EP 95100393 A EP95100393 A EP 95100393A EP 0665084 B1 EP0665084 B1 EP 0665084B1
Authority
EP
European Patent Office
Prior art keywords
tracing
edge
face
tooth
land
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 - Lifetime
Application number
EP95100393A
Other languages
German (de)
English (en)
Other versions
EP0665084A1 (fr
Inventor
Roland Börner
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.)
Oswald Forst Maschinenfabrik u Apparatebauanstalt GmbH and Co KG
Original Assignee
Oswald Forst Maschinenfabrik u Apparatebauanstalt GmbH and Co KG
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 Oswald Forst Maschinenfabrik u Apparatebauanstalt GmbH and Co KG filed Critical Oswald Forst Maschinenfabrik u Apparatebauanstalt GmbH and Co KG
Publication of EP0665084A1 publication Critical patent/EP0665084A1/fr
Application granted granted Critical
Publication of EP0665084B1 publication Critical patent/EP0665084B1/fr
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Expired - Lifetime 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
    • B24B3/16—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of broaches

Definitions

  • the invention relates to a machine according to the preamble of claim 1.
  • the free-surface contact edge and the rake contact surface serve to determine the position of the geometry of the spatial tooth in the area of its worn cutting edge.
  • the reason for not directly capturing the cutting edge geometrically is that the worn cutting edge is not a sharp edge, but an arcuate curved surface and that so-called wear marks are or may be present in its vicinity, so that errors occur during the scanning can. For this reason, not only the free surface, but also the rake surface are scanned at a predetermined distance from the original cutting edge.
  • the rake face is primarily ground using a disc grinding wheel that is adapted to its shape.
  • the respective open area is not sanded every time, but also when required.
  • These grinding processes change the geometry of the clearing tooth because of the open area is inclined with respect to the horizontal, ie the direction of movement of the broach tooth, and since one layer is removed from the free surface with each free surface grinding.
  • the position of the chip chamber base is a geometrically fixed quantity for the tool.
  • probe fingers have therefore already been used, which dip into the chip chamber with a probe section, a chip chamber base contact edge detecting its position, while a rake face contact edge records the relative position of the chip chamber in the direction of movement of the horizontal slide.
  • the invention is based on the object of designing a machine of the generic type in such a way that all relevant data of a clearing tooth can be acquired with as little time as possible.
  • Claim 2 represents an advantageous embodiment of the touch finger.
  • the embodiment according to claim 3 enables a particularly precise detection of the geometric position of the cutting edge.
  • the further subclaims represent further advantageous refinements.
  • an automatic broaching tool has a horizontal slide 3, which is guided on a machine bed 1 and driven by a non-visible servo motor in the machine bed 1 via a roller spindle 2, which carries a broaching tool 5 to be sharpened on a magnetic chuck 4.
  • the broaching machine also has a vertical slide 7 connected to the machine bed 1, which is also driven by a servo motor, also not shown in the drawing, via a roller spindle 8. At the upper end it rotatably supports a grinding slide 9 with one or more grinding spindles 10.
  • the grinding slide 9 can be moved back and forth on the vertical slide 7 transversely to the horizontal slide 3, ie perpendicular to the plane of the drawing in FIG. 1.
  • control or control cabinets 11 are provided, in which the - pre-programmable - control devices for controlling the individual drive motors are accommodated.
  • a scanning device 12 is arranged on the front part of the grinding spindle 10, by means of which the geometry of the broaching tool 5 to be ground is recorded so that exact regrinding is possible.
  • This broaching tool described so far is known, for example, from EP 0 071 882 A (corresponding to US Pat. No. 4,495,733). Otherwise, this machine is commercially available.
  • the scanning device 12 is shown schematically in FIG. 2. A detailed description and description is contained in EP 0 072 934 B1. Thereafter, the scanning device 12 has a scanning finger 13 which is detachably attached to a vertically displaceable carriage 14. This vertically displaceable carriage 14 is mounted in a horizontally displaceable carriage 15, so that the touch finger 13 can execute exact vertical and horizontal movements running at right angles to one another, in the plane in which the broaching tool 5 fastened on the horizontal carriage 3 for grinding can also be carried out is arranged.
  • the two slides 14, 15 are each coupled to analog or digital displacement transducers 16, 17, so that movements of the touch finger 13 relative to the scanning device 12 are converted into electrical signals, which are then stored in the control devices mentioned and in corresponding controls for the individual drive motors be implemented.
  • the broaching tool 5 has broaching teeth 18 in the usual way, each of which has a rake face 19 and a free face 20, the rake face 19 of a broaching tooth 18 passing into a chip chamber base 21 and from there into the tooth back 22 of an adjacent broaching tooth 18, resulting in its open face 20 connects.
  • the free surface 20 and the rake face 19 form on their penetration line the cutting edge, which is worn out during broaching and - as can be seen in particular from FIG. 3 - is no longer sharp-edged but rounded off after a certain operating time.
  • the rake face 19, the chip chamber base 21 and the tooth back 22 delimit a chip chamber 24.
  • the tactile finger 13 has the basic shape of a tactile finger for grasping the chip chamber 24, ie it has a lower tactile section 25 which bends at an angle a of approximately 45 ° with respect to the vertical 26 is to the rake face 19 of the chip chamber 24 to be scanned. It has a rake face contact edge 27 and a base edge 28 of the chip chamber, which can be sharp-edged but can also be formed with rounded transition areas, as can be seen in FIG. 3.
  • the contact edge 27 and the tracing edge 28 each run perpendicular to the plane of the drawing parallel to one another and lie in a plane 29 which also includes an angle b of approximately 45 ° with the vertical 26, the angle b being the angle a - based on the vertical 26 - opposite, ie the plane 29 runs at an angle of approximately 90 ° for kinking.
  • a recess 31 is formed in an end surface 30 of the pushbutton 13 which essentially connects the edges 27, 28, coincides with the plane 29 or lies directly adjacent to this, and is delimited by two boundary surfaces 32, 33 which are at an angle c of approximately 90 ° to each other, one boundary surface 33 adjacent to the base of the chip chamber running parallel to the vertical 26, while the other boundary surface 32 adjacent to the rake contact edge 27 extends approximately horizontally, that is to say parallel to the horizontal 34.
  • the boundary surface 32 ' can also be inclined in the direction of the contact edge 27, specifically with respect to the horizontal 34 by an angle f of 10 to 20 ° and preferably 15 °, thereby increasing it Boundary surface 32 'is extended relative to the boundary surface 30. This can be useful if the overflow of the Touch finger 13 over the cutting edge 23 is so large due to the reaction time of the horizontal slide 3 that the boundary surface 32 would no longer come to rest on the cutting tooth 23.
  • each clearing tooth 18 is inclined downwards by a clearance angle d with respect to the horizontal 34 - as seen from the cutting edge 23.
  • the rake face 19 of each broach 18 is - as seen from the cutting edge 23 - inclined relative to the vertical 26 by a rake angle e to the tooth back 22 of the same broach 18. Due to this general geometry of the clearing teeth 18 and the described geometry of the recess 31 with the boundary surfaces 32, 33 and the contact edges 36, 37, only these contact edges 36, 37 come into contact with the free surface 20 or the rake surface 19 when the cutting edge 23 is in the way to be described is received in the recess 31 of the finger 13.
  • the extension of the scanning section 25 in the direction of the horizontal 34 is smaller than the corresponding extension of the chip chamber 24, so that the scanning finger 13 can dip freely into the chip chamber 24 from above with its scanning section 25.
  • the probe section 25 is delimited on its side opposite the rake face contact edge 27 by a contact surface 38 starting from the chip chamber base contact edge 28, which forms a contact edge 39 at the transition into the probe finger 13.
  • FIG. 4b The position of the touch finger 13 relative to the clearing tooth 18 when it reaches its cutting edge 23 is shown in FIG. 4b.
  • the touch finger 13 moves downwards in the vertical direction, its end surface 30 sliding over the (worn) cutting edge 23 in the area between the chip chamber base touching edge 28 and the boundary surface 33.
  • the touch finger 13 falls down until the boundary surface 32 rests on the worn cutting edge 23.
  • the signals emitted by the displacement sensor 16 during the downward movement of the touch finger 13 are also stored, and in the same way as the signals already mentioned above, each assigned to travel sections which were covered by the horizontal slide 3 with the broaching tool 5. This position is shown in Fig. 4 c.
  • the cutting edge 23 is hereby exactly determined by the geometrical data of the rake surface contact edge 37 for the rake surface 19 and the free surface contact edge 36 for the open surface 20. They are also saved.
  • the carriage 15 of the scanning device 12 is displaced, as a result of which the associated displacement transducer 17 emits path-dependent signals which, on the one hand, are stored and, on the other hand, are used to stop the horizontal slide 3.
  • the movement of the horizontal slide 3 in the direction 41 from the position in FIG. 4 c to the position in FIG. 4 d took place at a much lower speed than the movement of the horizontal slide 3 in the direction 40 during the movement in accordance with FIGS. 4 a, b and c.
  • the horizontal slide 3 is moved in the direction 40, first the boundary surface 32 and then the region of the end surface 30 between the boundary surface 32 and the rake face contact edge 27 sliding over the (worn) cutting edge 23.
  • the touch finger 13 is already moving downwards in the direction of the chip chamber base 21, as can be seen in FIG. 4 e.
  • the touch finger 13 falls down in the direction of the vertical 26, whereby its touch section 25 dips into the chip chamber 24 until the chip chamber base contact edge 28 comes to rest on the chip chamber base 21, as shown in FIG. 4 f can be seen.
  • the horizontal slide 3 is still moved in the direction 41 during this falling movement of the touch finger 13, there is a certain horizontal distance between the rake face contact edge 27 and the cutting edge 23 until the horizontal slide 3 is stopped.
  • the detection of the geometric position of the cutting edge 23 on the one hand and the chip chamber base 21 on the other hand takes place continuously one after the other, so that in one pass of a broaching tool 5 under the scanning device 12 the exact geometric position of the cutting edges 23 on the one hand and the chip chamber base 21 on the other hand, all teeth 18 are detected and stored. It is then possible to grind the rake faces 19 to the bottom of the chip chamber 21 on the one hand and the flanks 20 on the other hand in this order, with appropriately profiled disc grinding wheels for grinding the chip chamber 24 and cup grinding wheels with their end faces for free surface grinding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (5)

  1. Machine pour l'affûtage automatique des dents (18) d'outils de brochage (5), qui comporte un chariot horizontal (3) mobile à l'horizontale (34) en deux sens opposés (40, 41) par le moyen d'un dispositif d'entraînement et destiné à la fixation d'une broche (5) à affûter, et un chariot vertical (7) mobile à la verticale (26) en deux sens opposés par le moyen d'un dispositif d'entraînement et muni d'au moins un axe d'affûtage (10) et d'un dispositif de palpage (12) conjugué à l'axe d'affûtage (10), le dispositif de palpage (12) présentant un doigt de palpage (13) qui est mobile par rapport au dispositif de palpage (12) au moins à plomb du chariot horizontal (3) et couplé avec au moins un élément (capteur de déplacement 16) fournissant des signaux de déplacement pour la commande au moins du dispositif d'entraînement du chariot horizontal (3), le doigt de palpage (13), pour la détection de la position de l'arête de coupe (23) d'une dent (18), présentant un bord de palpage (36) de face de dépouille, qui est limité par un dégagement (35) et destiné à reposer sur la face de dépouille (20) de la dent (18) dans le voisinage de l'arête de coupe (23) de celle-ci, et présentant un bord de palpage (37) de surface de coupe, qui est déplacé vers le bas par rapport au bord de palpage (36) de face de dépouille et destiné à venir en contact avec la surface de coupe (19) de la dent (18) dans le voisinage de l'arête de coupe (23) de celle-ci, caractérisée en ce que sur l'extrémité inférieure de la doigt (13), qui est écartée du dispositif de palpage (12) et formée comme section de palpage (25), un bord de palpage (28) du fond de l'espace entre dents, qui est situé au-dessous du bord de palpage (37) de surface de coupe, est prévu pour s'attacher au fond (21) de l'espace (24) entre dents (18), et en ce qu'un bord d'attachement (27) aux surfaces de coupe, qui est situé au-dessus du bord de palpage (36) de face de dépouille, est prévu pour s'attacher à la surface de coupe (19) de la dent (18) à l'écart de l'arête de coupe (23) de celle-ci, le bord de palpage (28) du fond de l'espace entre dents d'une part et le bord d'attachement (27) aux surfaces de coupe d'autre part logeant, entre eux par rapport au sens de mouvement (40, 41) du chariot horizontal (3), le bord de palpage (37) de surface de coupe et le bord de palpage (36) de face de dépouille.
  2. Machine selon la revendication 1, caractérisée en ce que la section de palpage (25) est coudée d'un angle (a) par rapport à la verticale (26).
  3. Machine selon la revendication 1 ou 2, caractérisée en ce que le bord d'attachement (27) aux surfaces de coupe et le bord de palpage (28) du fond de l'espace entre dents sont reliés par une surface terminale (30) du doigt de palpage (13), dans laquelle est prévu un évidement (31), entre les périphéries (32, 33; 32') duquel et le dégagement (35) sont formés le bord de palpage (36) de face de dépouille et le bord de palpage (37) de surface coupe.
  4. Machine selon la revendication 3, caractérisée en ce que les périphéries (32, 33) s'étendent à l'horizontale (34), respectivement à la verticale (26).
  5. Machine selon la revendication 3, caractérisée en ce que la périphérie (32') de l'évidement (31) entre le bord de palpage (36) de face de dépouille et le bord d'attachement (27) aux surfaces de coupe est inclinée d'un angle (f) vers le haut par rapport à l'horizontale (34) et en sens vers le bord d'attachement (27) aux surfaces de coupe.
EP95100393A 1994-01-26 1995-01-13 Machine pour affûter des outils de brochage Expired - Lifetime EP0665084B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9401282U 1994-01-26
DE9401282U DE9401282U1 (de) 1994-01-26 1994-01-26 Maschine zum automatischen Schärfen von Räumwerkzeugen

Publications (2)

Publication Number Publication Date
EP0665084A1 EP0665084A1 (fr) 1995-08-02
EP0665084B1 true EP0665084B1 (fr) 1997-07-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95100393A Expired - Lifetime EP0665084B1 (fr) 1994-01-26 1995-01-13 Machine pour affûter des outils de brochage

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EP (1) EP0665084B1 (fr)
DE (2) DE9401282U1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1752718C3 (de) * 1968-07-05 1975-02-13 Oswald Forst Maschinenfabrik Und Apparatebauanstalt Gmbh, 5650 Solingen Maschine zum automatischen Schärfen von Räumwerkzeugen
DE2926807C2 (de) * 1979-07-03 1986-11-13 Arthur Klink Gmbh, 7530 Pforzheim Verfahren zum automatischen Positionieren einer Räumwerkzeugschärfmaschine und Vorrichtung zum automatischen Nachschleifen von Räumwerkzeugen
DE3131511A1 (de) * 1981-08-08 1983-02-17 Oswald Forst Maschinenfabrik und Apparatebauanstalt GmbH & Co KG, 5650 Solingen Abtasteinrichtung fuer eine maschine zum automatischen schaerfen von raeumwerkzeugen
DE3131557A1 (de) * 1981-08-08 1983-02-24 Oswald Forst Maschinenfabrik und Apparatebauanstalt GmbH & Co KG, 5650 Solingen Tastfinger fuer eine abtasteinrichtung einer maschine zum automatischen schaerfen von raeumwerkzeugen
DE4129827A1 (de) * 1991-09-07 1993-03-11 Klink Gmbh Arthur Vorrichtung zum ausmessen von raeumwerkzeugen

Also Published As

Publication number Publication date
DE9401282U1 (de) 1994-03-10
EP0665084A1 (fr) 1995-08-02
DE59500368D1 (de) 1997-08-21

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