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WO2012069661A1 - Pièce de blocage - Google Patents

Pièce de blocage Download PDF

Info

Publication number
WO2012069661A1
WO2012069661A1 PCT/EP2011/071220 EP2011071220W WO2012069661A1 WO 2012069661 A1 WO2012069661 A1 WO 2012069661A1 EP 2011071220 W EP2011071220 W EP 2011071220W WO 2012069661 A1 WO2012069661 A1 WO 2012069661A1
Authority
WO
WIPO (PCT)
Prior art keywords
block piece
recess
axis
lens
diameter
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.)
Ceased
Application number
PCT/EP2011/071220
Other languages
German (de)
English (en)
Other versions
WO2012069661A9 (fr
Inventor
Gunter Schneider
Ferdinand Achenbach
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.)
Schneider GmbH and Co KG
Original Assignee
Schneider 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
Priority claimed from DE102010053762A external-priority patent/DE102010053762A1/de
Application filed by Schneider GmbH and Co KG filed Critical Schneider GmbH and Co KG
Priority to US13/989,592 priority Critical patent/US20130303060A1/en
Publication of WO2012069661A1 publication Critical patent/WO2012069661A1/fr
Publication of WO2012069661A9 publication Critical patent/WO2012069661A9/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/005—Blocking means, chucks or the like; Alignment devices

Definitions

  • the invention relates to a one-piece block piece for holding an optical lens to be machined in a machine tool formed from a base body with a rotation axis, with a zuwendbaren the lens holding surface and with an applicable in a workpiece spindle, radially outwardly directed bearing surface, wherein the support surface at least a recess or a plurality of recesses around the rotation axis or distributed over the circumference ⁇ has, which have a diameter DA and the inclusion of bonding compound for adhesive bonding with the lens.
  • the basic body fulfills the bearing function in the workpiece spindle and at the same time the complete holding ⁇ function for the lens or the spectacle lens.
  • a block piece for holding an optical workpiece for its processing from DE 10 2004 023 036 AI, which comprises a base body having an end face on which the workpiece is aufblockbar by means of a temporarily deformable material, and has a clamping surface over which the workpiece blocked on the base body can be fixed to a spindle of a processing machine.
  • the main body is injection molded from plastic and provided on its end face with at least two recesses for receiving the connec ⁇ tion material, which are arranged on both sides of a gedach ⁇ th plane containing the central axis of the base body and the central axis of the basic ⁇ body respectively nearest Boundary surface forms a Deutschenschneidung.
  • DE 10 2004 023 036 Al describes a further block ⁇ piece of metal, which according to the German standard DIN 58766 is formed and used for the application of a low-melting metal alloy as a connecting material.
  • the main body has a central through hole with a first and a second undercut and two provided within the through hole blind holes.
  • the through hole is filled up to the region of the second undercut with the connecting material.
  • the spectacle lens is held in a form-fitting manner on the block piece both in the axia ⁇ ler and in the circumferential direction. Due to the through hole, the connecting material is accessible, so that an increased heat dissipation can be realized.
  • a block piece which is designed similar to the above-described ⁇ ne, but it is made of a plastic such as a glass fiber ⁇ reinforced polyamide formed.
  • a block piece for an optical lens to be processed is known.
  • the block piece can be connected to the lens via a connecting material, wherein the block piece has a recess in which the connecting material for holding the lens can be fixed positively and / or non-positively.
  • the recess is formed as a closed container for connecting material, wherein the container limits a receiving volume which can be filled with connecting material.
  • the bonding material is heated for the purpose of filling and Verflüssi ⁇ supply, after the filling or casting is the cooling of the same is necessary.
  • the duration of this cooling depends, inter alia, on the introduced mass, so that the person skilled in the art provides as little mass as possible.
  • the bonding material solves insbesonde ⁇ re in the region of the center of the lens due to curing, because with the cooling ⁇ cooling a cooling gradient corresponding, and thus un ⁇ uniform shrinkage process is accompanied.
  • the invention has for its object to form a block piece and to arrange so that a release of the Ver ⁇ bonding material is prevented on the lens.
  • the object is achieved according to the invention in that in the holding surface of at least three or four around the rotation ⁇ axis around or distributed over the periphery are arranged from ⁇ recesses are provided, wherein the ratio of the ⁇ diameter DA of the recess in the radial direction to Rotati ⁇ onsachse to a diameter DL of the bearing surface between 0.14 and 0.3 or between 0.21 and 0.27 is or about 0.25 and / or the ratio of a depth TA of the recess in the axial direction to the axis of rotation to a height H of the block piece from 0.28 to 0.59 or 0.41 to 0.56 or about 0.53, and / or the ratio of the diameter DA of the recess in the circumferential direction to the Rota ⁇ tion axis to a width Bl of the web (4.1 -4.6) between the recess is between 0.5 and 3.5 or between 1 and 3.0 or between 1.5 and 2.5 or is 2.1.
  • the stop surface for the work piece spindle ⁇ is decisive that the bearing surface sawn up borders.
  • the amount S of the bridge here is not to be taken into ⁇ into account.
  • the recesses distributed around the axis of rotation or distributed over the circumference can each be arranged at the same or different radial distances from the axis of rotation.
  • the further development of the diameter of the recess in the axial direction has no influence. If the recess should therefore be set against the axis of rotation or taper or widen conically, this has no influence on the determination of the radial distance.
  • the respective recess ensures a force acting in the circumferential direction form-fitting coupling of the kausmas ⁇ se on the block piece.
  • the diam ⁇ ser DA at least 5 mm - 8 mm, and / or are arranged distributed at least four, five, six or a greater number of recesses around the circumference or in the direction around the rotational axis.
  • a higher number initially 7, 8, 23 or 24 are considered.
  • With increased number or increased diameter a larger amount of compound compound is associated.
  • the same applies to the number of The product of number and diameter is limited upwards due to the fixed size of the block piece, ie as the number of recesses increases, the diameter that can be realized for each recess becomes smaller.
  • recesses with different diameters are possible, each having the same or different radial distances from the axis of rotation.
  • recesses are also recesses which are groove-shaped, that is, the diameter of which is measured in the radial direction is less than or RESIZE ⁇ SSER than their extent in the circumferential direction. For determining the diameter, the opening cross-section of the respective recess existing in the holding surface is also to be drawn.
  • At least one of ⁇ recess as a hole or through hole and / or a recess is Minim ⁇ least designed as a blind hole.
  • a hole or a blind hole can make a quick and a ⁇ ways. Basically, these Geomet ⁇ rieanteile can also be cast, which, however, if necessary, a Nachbearbeitungsaufwand remains.
  • Diameter DA of the recess or bore is the measure of the core drilling prevail.
  • a web when a web is provided with a width Bl between two recesses, preferably in the circumferential direction, wherein the width Bl Zvi ⁇ rule 4 mm and 10 mm is large.
  • the achievable heat dissipation increases with the available surface of the recess. If the recesses do not adjoin one another, then a web is guaranteed ⁇ which increases the available surface.
  • the width Bl of the web is also measured according to the opening cross section of the flanking recesses. So it is the width Bl measured on the support surface twist.
  • the recess or the bore has an undercut with respect to the direction of the axis of rotation.
  • An undercut can be formed in different ways. The known from the prior art undercuts find use on ring trenches and are thus formed in the form of a circumferential groove.
  • the application of a thread within the bore and / or a position of the borehole axis relative to the axis of rotation advantageous to form the undercut according to the invention.
  • the job may be more ⁇ way, as they can already be realized with the drilling without additional step of threading.
  • the borehole axis takes place either in the circumferential direction, so that at least the depth of Boh ⁇ tion and / or the remaining wall thickness di, since beibe ⁇ can be kept.
  • An employment to the axis of rotation out is also provided, whereby the fit of shrinking fender compound compound is improved.
  • the recess for forming the undercut can also have a conical cross section, that is to say be provided with an axially increasing diameter.
  • the recess thus produced can be both rotationally symmetric and non-rotationally symmetrical.
  • a shoulder widening the holding surface is provided with an axially against the workpiece spindle placed opposite the stop surface placed stop surface, wherein the shoulder has an outer diameter D with D> 43 mm and the recess at least partially is arranged in the shoulder, wherein a diameter Dl of the recess is at least 43 mm.
  • the groove is preferably circular or part-circular, so that it can be imaged by a turning process.
  • a disadvantageous detachment of the bonding compound from the lens is prevented, at least in the edge region. This also creates a backorder stock, which fulfills the tracking function. At the edge of the adhesive ⁇ medium, cools very rapidly, so that the proportions mentioned above to at ⁇ challenging one need not apply.
  • the recess is arranged within the holding surface and / or within a side surface of the shoulder. Both types of arrangement, and thus the orientation of the recess, form a desired undercut with respect to a direction parallel to the axis of rotation which effects an axial positive fit between the connecting mass and the block piece. Since thermoplastic connecting material shrinks as it cools, the outer recess in the side surface could justify a higher bias of the Verbin ⁇ dung mass.
  • one or more further grooves are provided within the holding surface, which form a distinction, wherein the respective further groove is employed inwardly towards the axis of rotation.
  • the amount of bonding compound that can be introduced in the middle region of the block piece or the lens is indeed increased significantly;
  • this increased amount of compound compound forms a so-called.
  • Expansionsvor ⁇ Council which prevents adverse cooling on the lens in the center at the time of cooling.
  • connecting material can flow out of the grooves, so that adverse shrinkage stresses in the region of the contact zone can be prevented with the lens.
  • the connecting material is cooled to ⁇ due to the increased mass also a time delay.
  • the further groove is circular or partially circular or spiral-shaped. This leads to the same result, namely an increase in the available connection mass over a portion of the coupling zone between the lens and block piece.
  • At least one groove with a width B2 is provided opposite the holding surface, wherein the groove is provided at the level of the web with respect to the circumferential direction.
  • the groove is thus arranged between two recesses, so that in the present case, in which both the groove and the recess taper, an increased depth of the groove adjacent to the recesses is possible.
  • the groove in the axial direction to the recess the depth of the recess and hence the amount of recordable Verbin ⁇ dung mass would have to be significantly lower.
  • the groove is formed as Mitauer- or Index istsnut. Since this type of block pieces is standardized in particular with respect to the formation of the outer surfaces and the aforementioned grooves, an adaptation of the architecture of the recesses to the given space is important.
  • the width B2 is greater than the width Bl. This ensures a narrow web and a correspondingly large bore. Since the groove is wider than the web, in order to avoid an axial overlap of the same, the above-mentioned central arrangement between the holes is realized.
  • At least one recess is provided with respect to the direction of the axis of rotation opposite the holding surface and the holding surface is designed to be continuous with respect to the recess.
  • the recess or a passage during the blocking of the lens or during filling of the bonding compound need not be sealed.
  • the thus available surface portions, which come into contact with the filled compound compound, ensure a good cooling of the same.
  • the block piece can be held in the central area for lack of passage with a sucker.
  • an end face of the holding surface is curved.
  • the size of the radius of curvature of the end face is preferably on the Curvature radii of the lenses to be fastened or an average thereof aligned.
  • the block piece is formed of metal.
  • the passage-free block pieces ⁇ who made the prior art of plastic, while the block pieces of metal centered have a passage. This passage is omitted in order to increase the contact surface to the bonding mass.
  • the formation of metal also ensures sufficient strength against the background of the recesses according to the invention. In the area of the central recess We ⁇ of action is a plunger to be placed there for dissolving the block piece from its housing very good, because this area is also formed of metal. Metal provides ⁇ makes also a good cleaning and is also much more robust than plastic.
  • the adhesion between the lens and the bonding compound is also ensured in the area of the center.
  • the bonding compound forms a flat intermediate layer between the block piece and the lens placed at a distance from the block piece.
  • the diameter DV of the connecting mass is greater than the diameter DL of the bearing surface and greater than the diameter D of the block piece.
  • Figure la is a top view
  • Figure 1b is a bottom view
  • Figure 2 is a sectional view according to view A-A;
  • Figure 3 is a sectional view according to view B-B;
  • Figure 4 is a perspective view from below with a blocked lens
  • FIG. 5 is a sectional view of a further exemplary embodiment according to FIG. 3
  • FIG. 3
  • FIG. 6b embodiment of Figure 6a in the view of Figure la;
  • Figure 7 further embodiment in the view
  • FIG. 6b is a diagrammatic representation of FIG. 6b.
  • a one-piece block piece 1 in the form of a base body 1 with a blocked via bonding compound 7 lens 8 are shown in perspective from below.
  • Starting from a non-visible holding surface 2 of the basic body 1 extends the connecting mass 7 in both the axial and in the radial direction, so that the lens 8 is supported over a total diameter DV of about 53 mm to 68 mm.
  • the diameter DV can also be increased to the extent of the male lens 8, so that the largest possible or maximum support is ensured during the machining process.
  • the block piece 1 or the main body 1 has a ringförmi ⁇ ge basic shape and is usually made of metal Herge ⁇ provides.
  • the block piece 1 outer circumference a cylindrical bearing surface 3 with a diameter DL, via which the block piece 1 with the blocked lens 8 in a Workpiece spindle chuck (not shown) can be clamped.
  • the bearing surface 3 closes towards the front via a shoulder 1.2 with a spindle side angeord ⁇ Neten stop surface 1.5, whose diameter D is greater than the diameter DL of the bearing surface 3.
  • a conical centering 1.3, through a flat end face 1.4 is limited at the back.
  • a central, conical recess 6 and two with respect to a rotation ⁇ axis 1.1 diametrically opposite driving grooves 5.1, 5.2 are provided in the end face 1.4 .
  • the depth of the driving grooves 5.1, 5.2 corresponds to almost the height Hz of the centering 1.3.
  • the driving grooves 5.1, 5.2 have a substantially V-shaped basic shape, which terminates inwardly with a Radi ⁇ us R.
  • indexing groove 5.3 pre- seen that ensures the desired angular orientation of the block ⁇ piece 1 in the workpiece spindle chuck.
  • the support surface 2 of the block ⁇ piece 1 has a central, almost over the entire diameter D extending recess 9, which has a Tie ⁇ fe t of about 0.5 mm. This depth t may vary depending on the curvature of the lens 8 to be blocked.
  • six recesses in the form of bores 2.1 - 2.6 distributed over the circumference or in the direction about the axis of rotation 1.1 are provided. Between each two holes 2.1 - 2.6, a web 4.1 - 4.6 is formed, which has a width Bl of about 5 mm.
  • a diameter DA of the recess or bore 2.1 is 10 mm. This results in a ratio of width Bl to diameter DA of about 0.5.
  • the bore 2.1 - 2.6 has a depth TA of about 8.5 mm.
  • the support surface 2 with the recess 9 and the recesses 2.1 - 2.6 is formed breakthrough-free with respect to the recess 6 and the centering 1.3, the holes 2.1 - 2.6 are limited in their depth TA.
  • the jewei ⁇ term bore 2.1 - 2.6 is relatively close to the La ⁇ geramide 3 of the block piece 1 is arranged.
  • a remaining wall thickness da between the respective bore 2.1 - 2.6 and the bearing surface 3 is about 1 mm.
  • Between the respective bore 2.1 - 2.6 and the rear recess 6 remains a wall thickness di of more than 0.5 mm.
  • the illustrated in Fig. 2 cross-sectional shape of the block ⁇ piece 1 is standardized in the rule.
  • the previously mentioned bearing surface 3 has a diameter DL of 43 mm. It is bounded at the top by the shoulder 1.2, wherein the centering surface ⁇ 1.3 connects to the lower end of the block piece.
  • the block piece 1 has a total height of 19 mm, which is composed of the height H of 17 mm of the standardized part of the block piece 1 to the stop surface 1.5 and a height S of 2 mm for the shoulder 1.2.
  • the height S of the shoulder 1.2 can vary.
  • the abutment surface 1.5 determines the relative position to the workpiece spindle and thus represents an almost fixed size.
  • the two cam grooves 5.1, 5.2 are provided, which are formed starting from the tapered lower end face 1.4 with respect to the direction of the rotation axis 1.1. Furthermore, the indexing groove 5.3 is provided within the centering section Z.
  • the bore 2.1 according to FIG. 2 has, as an example, a thread aligned coaxially to a borehole axis a, which thread is formed at least over a partial height of the depth TA. It can all parts or only part, z. B. every second Boh ⁇ tion 2.1-2.6 be formed with such a thread.
  • an undercut 2.8 ⁇ can be formed by an adjustment of the borehole axis a relative to the axis of rotation 1.1, as outlined in Fig. La.
  • the ends of the borehole axis marked by "+" a at the opening cross-section on the one hand and at the lowest point of the recess 2.1, 2.4 on the other hand have an offset V relative to each other, according to embodiment Fig. La (recess 2.1) in the circumferential direction and according to embodiment ⁇ example Fig. La (recess 2.4) in the radial direction to the axis of rotation 1.1 runs out.
  • the depth TA of the bore 2.1-2.6 and the wall thicknesses di, since at least maintained or increased. It is possible all holes 2.1-2.6 or only part, z. B.
  • the respective offset V is oriented in opposite directions with respect to a circumferential direction (recesses 2.1, 2.2).
  • the offset V can also be aligned in the same direction, especially if it is combined with an offset V in the circumferential direction.
  • the holes 2.1 are - 2.6 with respect to the circumferential direction in such a way to the two driving grooves 5.1, positioned 5.2, that the respective cam groove 5.1, 5.2 Zvi ⁇ rule in each case two holes 2.1 - 2.6, and therefore in the region of a web 4.1, 4.2 is arranged.
  • Fig. 3 which shows the sectional view of the view BB of Fig. Lb ⁇ again, there is no breakthrough between the respective cam groove 5.1, 5.2 and the bore 2.2, 2.6.
  • the Stirnflä ⁇ surface 2.7 of the support surface 2 is flat.
  • the cam groove 5.1, 5.2 has according to Fig. Lb a width B2 of about 10 mm and tapers to a width of almost 5 mm, wherein it terminates with a radius R of 2.5 mm.
  • the end face 2.7 ⁇ can also be curved as required or provided with a radius of curvature R2, so that an adaptation to the shape of the male Lin ⁇ se 8 is ensured.
  • the size of the radius of curvature R2 of the end face 2.7 ' is in the range between 70 mm and 90 mm. It is preferably aligned with the radii of curvature of the lenses 8 to be fastened or an average value thereof.
  • Embodiment Figure 5 (right side) is provided with an axial depth provided in the loading area of the shoulder ⁇ 1.2 a force acting in the axial direction 1.2a undercut in the form of a circumferential groove 1.2a t2 and an opening angle ⁇ .
  • the groove 1.2a is provided in the shoulder of 1.2 in the region of the largest diameter D of the block piece 1 to be processed in particular when starting a tool against an edge of one lens is not illustrated here, the greatest possible retaining force of the not shown Haftmit ⁇ means of the block piece 1 to ensure.
  • the depth t2 of the groove 1.2a increases in the axial direction to the rotation axis 1.1. Therefore, the undercut 1.2a has an outwardly sloping bottom surface 1.2b.
  • the opening angle ⁇ is between 25 ° and 45 °, preferably 35 °.
  • the groove 2.1a is outwardly opposite to the rotation axis 1.1 and is employed alternatively or in addition to those shown in Fig la - recesses illustrated. 2 (2.1 - 2.6) provided with the drill hole axis ⁇ a.
  • Embodiment 5 (left side) is located in radial direction outside the undercut 1.2a provided in the form of a circumferential groove in egg ⁇ ner side surface of the shoulder 1.2c 1.2.
  • the undercut 1.2a has a triangular cross section, which is due to the shape of the piercing tool. Alternatively, arcuate, semicircular or rectangular
  • the two variants of the groove 1.2a according to left and right side of Figure 5 are alternatively or additionally provided in the support surface 2.
  • a plurality of concentric, as further groove are alternatively ⁇ formed recesses 2.1 with the bores - provided 2.6.
  • the respective groove 2.1 - 2.6 or an axis of symmetry a of the cross-section Q is inclined relative to the axis of rotation 1.1 or ange ⁇ sets, so that it forms a rear separation 2.8 ⁇ with respect to the axial direction.
  • the respective wide ⁇ re groove is 2.1 - made inward toward the axis of rotation toward 1.1 at ⁇ 2.6.
  • the number of grooves 2.1 - 2.6 can be arbitrarily va ⁇ riiert. It is also intended to provide only one or two grooves.
  • the grooves 2.1 - 2.6 are provided even when using a curved end face 2.7 (shown in phantom).
  • a spiral groove is provided as shown in FIG 7, wherein vorzugswei ⁇ se only the inner grooves 2.2 -. Are formed as a single spiral groove 2.2 2.6, while the loading in rich of the largest diameter D of the block piece 1 vorgese ⁇ hene groove 2.1 is circular.
  • Figure 5, 6a and 7 is common ⁇ sam, that at least one undercut 1.2a or groove 2.1 is located completely outside, in a diameter range between 80% and 100% of the diameter of the D of the block piece 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

L'invention porte sur une pièce de blocage 1 destinée à tenir une lentille 8 possédant un axe de révolution 1.1, dans une machine-outil, comprenant une surface de maintien 2 dirigée vers la lentille 8 et une surface de portée 3 pouvant être posée dans une broche de pièce, et dirigée radialement vers l'extérieur, la surface de maintien 2 présentant au moins un évidement 1.2a ou plusieurs évidements 2.1 - 2.6, répartis autour de l'axe de révolution 1.1, qui présentent un diamètre DA et qui servent à recevoir une pâte de liaison 7 servant à la liaison adhésive avec la lentille 8.
PCT/EP2011/071220 2010-11-26 2011-11-28 Pièce de blocage Ceased WO2012069661A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/989,592 US20130303060A1 (en) 2010-11-26 2011-11-28 Block piece

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE102010052467 2010-11-26
DE102010052467.0 2010-11-26
DE102010053762.4 2010-12-08
DE102010053762A DE102010053762A1 (de) 2010-11-26 2010-12-08 Blockstück
EPPCT/EP2011/071062 2011-11-25
EP2011071062 2011-11-25

Publications (2)

Publication Number Publication Date
WO2012069661A1 true WO2012069661A1 (fr) 2012-05-31
WO2012069661A9 WO2012069661A9 (fr) 2012-08-30

Family

ID=45217526

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/071220 Ceased WO2012069661A1 (fr) 2010-11-26 2011-11-28 Pièce de blocage

Country Status (2)

Country Link
US (1) US20130303060A1 (fr)
WO (1) WO2012069661A1 (fr)

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Publication number Priority date Publication date Assignee Title
USD753748S1 (en) * 2014-08-11 2016-04-12 Schneider Gmbh Co. Kg Block piece for optical lenses
DE102017001792A1 (de) * 2017-02-24 2018-08-30 Schneider Gmbh & Co. Kg Blockstück zum Blocken einer Linse

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