EP0645222A1 - Procédé et appareil pour pièces à travailler - Google Patents

Procédé et appareil pour pièces à travailler Download PDF

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Publication number
EP0645222A1
EP0645222A1 EP94110576A EP94110576A EP0645222A1 EP 0645222 A1 EP0645222 A1 EP 0645222A1 EP 94110576 A EP94110576 A EP 94110576A EP 94110576 A EP94110576 A EP 94110576A EP 0645222 A1 EP0645222 A1 EP 0645222A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
scraping
scraper
scraper blades
blades
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.)
Granted
Application number
EP94110576A
Other languages
German (de)
English (en)
Other versions
EP0645222B1 (fr
Inventor
Burkard Behrendt
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.)
Grenzebach GmbH and Co KG
Original Assignee
Babcock BSH AG
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 Babcock BSH AG filed Critical Babcock BSH AG
Publication of EP0645222A1 publication Critical patent/EP0645222A1/fr
Application granted granted Critical
Publication of EP0645222B1 publication Critical patent/EP0645222B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D99/00—Subject matter not provided for in other groups of this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G17/00—Manually-operated tools
    • B27G17/04—Spokeshaves; Scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/003—Mechanical surface treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
    • B27M3/20—Manufacture or reconditioning of specific semi-finished or finished articles of lasts; of shoes, e.g. sabots; of parts of shoes, e.g. heels

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a device according to the preamble of claim 3.
  • Wooden parts that are not rotationally symmetrical and have a geometrically complicated shape, such as School students or hangers are usually pre-milled. The remaining edges and roughness are rounded and smoothed by hand by grinding.
  • the invention has for its object to provide a new, also machine-feasible method according to the preamble of claim 1 and to provide an apparatus for performing the new method.
  • each point of a curved, non-spherical surface there are two positions rotated by 90 ° to one another, in which the scraping blade is oriented perpendicular to the surface. These two positions correspond to the main planes of curvature at this point. In principle, both positions are equally suitable for carrying out the method according to the invention. Depending on the circumstances, e.g. B. depending on the grain of the wood, one or the other position can be selected in individual cases.
  • the scraping blade need not be aligned exactly perpendicular to the workpiece surface. In the case of unevenly curved surfaces, it can usually only meet this requirement exactly in one point. However, it should not deviate more than about 10 ° to at most 15 ° from the vertical at any point on the scraping edge that comes into contact with the workpiece surface.
  • a device according to the invention preferred for practical use is the subject of claim 4.
  • the preferred embodiment of the workpiece holder according to claim 6 allows the workpiece evasive movements. This improves machining uniformity. The friction is kept within limits and jams are avoided.
  • the workpiece itself is set in motion relative to the non-driven unit by the driven unit.
  • the non-driven structural unit can act as a workpiece holder, so that an additional holder is unnecessary.
  • the number of scraper blades can be significantly reduced according to claim 8.
  • the feature of claim 13 has the advantage that any number of scraper blades, which are aligned according to the shape of the workpiece surface in a wide range of different angular positions, are set in motion by a single simple drive, which is perpendicular to it for each individual scraper blade self-directed component.
  • the diameter of the circular movement is to be dimensioned such that the areas of action of adjacent scraping blades overlap on the workpiece surface, so that no unprocessed gaps remain.
  • Figure 1 shows a longitudinal section through a workpiece to be machined with the associated arrangement of the scraper blades.
  • FIG. 2 shows a top view of the arrangement shown in FIG. 1, but without the scraping blades arranged above the workpiece.
  • Figure 3 shows a section along line III - III of Figure 2.
  • Figure 4 shows a section along the line IV - IV of Figure 2.
  • Figure 5 shows a side view of the overall device.
  • Figure 6 shows a section along the line VI - VI of Figure 5.
  • FIG. 7 and FIG. 8 show a modified exemplary embodiment in representations analogous to FIG. 5 and FIG. 6.
  • a workpiece 1 made of wood, the shape of which resembles a pointed shoe, has a surface consisting of several areas A to H.
  • the area A is the lateral surface of a non-rotationally symmetrical cylinder, the cross section of which - as can be seen from FIG. 3 - has approximately the shape of a U, i.e. H.
  • an approximately semicircular lower boundary line is followed by perpendicular, parallel boundary lines on both sides.
  • Another pronounced surface area B corresponds approximately to the outer surface of an elliptical truncated cone in the axial direction.
  • the cone angle in the sectional plane which contains the small axis of the ellipse and corresponds to the plane in FIG. 2, is approximately 15 °.
  • a region C adjoins the cone-like region B. This is shaped approximately as if it had been cut out of a surface of revolution that was created by rotating an arc about an axis of rotation directed perpendicular to the plane of FIG.
  • the workpiece 1 has a flat end surface D. Most of the upper side is a flat surface E, which, like the end surface D, should remain unprocessed.
  • the area A is assigned a plurality of flat scraping blades 2 arranged at short intervals from one another.
  • You are e.g. B. made of thin spring steel sheet.
  • Scraper blades from 0.08 to 0.15 mm thick, which were spaced at 1-3 mm were arranged, good results achieved.
  • Each scraper blade is arranged in a main plane of curvature on which the generatrices of the cylinder surface are perpendicular.
  • Each scraper blade 2 has a scraper edge 3 which is modeled on the contour of the cylinder surface, ie its intersection with the plane in which the scraper blade lies. The scraper edge is ground at right angles to the side surfaces of the scraper blade.
  • Each plane in which a scraper blade is arranged is exactly the main plane of curvature along the entire scraper edge 3.
  • the scraping blade 2 is thus aligned along the entire scraping edge 3 exactly perpendicular to the surface of the area A.
  • the scraper blades 4a of one set therefore form an angle of approximately 165 ° with the corresponding scraper blades 4b of the other set.
  • Corresponding scraper blades 4a, 4b are arranged and shaped mirror-symmetrically to the central plane, ie to the plane of FIG. 1. Their scraping edges 7a, 7b form approximately quarter ellipses. Only at the assigned generatrix 5, 6 is each scraper blade 4a, 4b aligned exactly perpendicular to the workpiece surface. At the other points of the scraping edges 7a, 7b, the angle between the scraping blade and the workpiece surface deviates from 90 ° without, however, leaving the tolerance range of approximately +/- 15 °.
  • the dome-like area C includes a plurality of scraper blades 8, which are arranged in meridional planes and have an arcuate scraper edge. This is modeled on the generatrix of the surface area C, which is understood as part of a surface of revolution with a vertical axis.
  • a special scraping blade 9 is arranged in the plane of FIG. 1 and is therefore best seen in FIG. 1. It extends with its scraping edge 10 over the areas B and C. This is possible because it lies in a plane which is the main plane of curvature not only for the dome-like area C but also for the cone-like area B. The scraping blade 9 is therefore exactly perpendicular to the workpiece surface over the entire length of its scraping edge 10.
  • a flat sheet 11 is arranged parallel to the end face D. It only serves as a stop.
  • the arrangement of the scraper blades 12 belonging to the concave surface region F is analogous to the arrangement of the scraper blades 2 of the surface region A.
  • the scraper blades 13, 14 are inclined. This arrangement is sufficient since the surface areas G, H only extend over a small circumferential area of the jacket of a pointed cone, so that the deviation from the vertical alignment remains within the tolerance range.
  • the scraper blades 2, 4a, 4b, 8, 9 intended for machining the surface areas A, B, C are connected to one another by thin rods 15 which are inserted through bores in the individual scraper blades and are immovably fastened to them form together with the sheet 11 and with a base plate 16 a unit 17.
  • This is connected by intermediate members 18 made of rubber-elastic material to a drive box 19 and by an eccentric drive 20, to which a balancing mass 21 is attached, can be set in a circular motion.
  • the diameter is slightly larger than the distance between two scraper blades 2.
  • the scraper blades 12, 13, 14 for processing the surface areas F, G, H are connected in a similar manner to a base plate 22 to form a second structural unit 23.
  • This can be positioned by means of piston-cylinder units 24, 25, which are fastened to a fixed crossmember 26, so that the scraping edges of the scraping blades 12, 13, 14 touch the workpiece 1 with low pressure.
  • Further piston-cylinder units 27, 28 are connected to the crossbeam 26 as workpiece holders and exert slight pressure on the workpiece 1 via flexible holding elements 29.
  • component 17 is set in a circular motion by eccentric drive 20. Since the drive axis is not perpendicular to any scraper blade of the assembly 17, a movement is imposed on each scraper blade which has a component directed perpendicularly to it itself.
  • the resiliently held workpiece 1 is set in a phase-shifted movement relative to the stationary assembly 23 for the circular movement of the component 17. Therefore, the scraping edges of the scraping blades 12, 13, 14 become effective in the areas F, G, H.
  • the individual scraper blades of the two assemblies 17, 23 are excited to forced vibrations, which reinforce the relative movement between the workpiece and the individual scraper edges.
  • the frequency of the eccentric drive 20 is expediently chosen so that it does not match the resonance frequency of a scraping blade. It should expediently be lower than the lowest natural frequency of a scraping blade. In experiments with a practical, simple device have Frequencies around 6000 U / min proven.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Jigs For Machine Tools (AREA)
EP94110576A 1993-09-27 1994-07-07 Procédé et appareil pour pièces à travailler Expired - Lifetime EP0645222B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4332781A DE4332781C1 (de) 1993-09-27 1993-09-27 Vorrichtung zum Glätten eines Werkstücks
DE4332781 1993-09-27

Publications (2)

Publication Number Publication Date
EP0645222A1 true EP0645222A1 (fr) 1995-03-29
EP0645222B1 EP0645222B1 (fr) 1997-10-22

Family

ID=6498690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94110576A Expired - Lifetime EP0645222B1 (fr) 1993-09-27 1994-07-07 Procédé et appareil pour pièces à travailler

Country Status (3)

Country Link
EP (1) EP0645222B1 (fr)
AT (1) ATE159450T1 (fr)
DE (2) DE4332781C1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1416904A (en) * 1920-03-29 1922-05-23 Peder O Stangeland Tool holder
GB358714A (en) * 1926-03-12 1931-10-15 Cyklop Aktien Ges Tool for smoothing wooden surfaces
EP0549961A1 (fr) * 1991-12-28 1993-07-07 Robert Bosch Gmbh Rabot à main à action de coupe elliptique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6501994A (fr) * 1964-07-23 1966-08-18

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1416904A (en) * 1920-03-29 1922-05-23 Peder O Stangeland Tool holder
GB358714A (en) * 1926-03-12 1931-10-15 Cyklop Aktien Ges Tool for smoothing wooden surfaces
EP0549961A1 (fr) * 1991-12-28 1993-07-07 Robert Bosch Gmbh Rabot à main à action de coupe elliptique

Also Published As

Publication number Publication date
ATE159450T1 (de) 1997-11-15
EP0645222B1 (fr) 1997-10-22
DE59404413D1 (de) 1997-11-27
DE4332781C1 (de) 1995-01-12

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