US3027814A - Turbine blade copying machine - Google Patents

Turbine blade copying machine Download PDF

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Publication number
US3027814A
US3027814A US824617A US82461759A US3027814A US 3027814 A US3027814 A US 3027814A US 824617 A US824617 A US 824617A US 82461759 A US82461759 A US 82461759A US 3027814 A US3027814 A US 3027814A
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United States
Prior art keywords
copying
piston
tool
turbine blade
slide
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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
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US824617A
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English (en)
Inventor
Schnellmann Oscar
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.)
GOTTFRIED WACHTBERGER VORM ERI
GOTTFRIED WACHTBERGER VORM ERICH FRANKE MASCHINENFABRIK
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GOTTFRIED WACHTBERGER VORM ERI
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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
    • B24B17/00—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor
    • B24B17/08—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor involving fluid transmission means only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/16—Working surfaces curved in two directions
    • B23C3/18—Working surfaces curved in two directions for shaping screw-propellers, turbine blades, or impellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q35/00—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q35/00—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually
    • B23Q35/04—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually using a feeler or the like travelling along the outline of the pattern, model or drawing; Feelers, patterns, or models therefor
    • B23Q35/08—Means for transforming movement of the feeler or the like into feed movement of tool or work
    • B23Q35/10—Means for transforming movement of the feeler or the like into feed movement of tool or work mechanically only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q35/00—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually
    • B23Q35/04—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually using a feeler or the like travelling along the outline of the pattern, model or drawing; Feelers, patterns, or models therefor
    • B23Q35/08—Means for transforming movement of the feeler or the like into feed movement of tool or work
    • B23Q35/18—Means for transforming movement of the feeler or the like into feed movement of tool or work involving fluid means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q2735/00—Control systems or devices for copying from a pattern or master model
    • B23Q2735/008—Control systems or devices for copying from a pattern or master model in a planing machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q2735/00—Control systems or devices for copying from a pattern or master model
    • B23Q2735/02—Means for transforming movement of the feeler into feed movement of tool or work
    • B23Q2735/08—Means for transforming movement of the feeler into feed movement of tool or work involving fluid means
    • B23Q2735/085—Means for transforming movement of the feeler into feed movement of tool or work involving fluid means in a milling machine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/50—Planing
    • Y10T409/500164—Planing with regulation of operation by templet, card, or other replaceable information supply

Definitions

  • Nimonic which is a hard metal containing about 80 to 90 percent of nickel.
  • Materials of this class are hard to work on and while for this reason the finishing operations are normaly done by grinding, the first operations in the shaping of the blade profiles should preferably be carried out by means of cutting tools for which reason a machining allowance of one to three millimeters is usually provided.
  • the present invention refers to a one or multi-stage turbine blade copying machine in which each unit, in the case of a multi-stage machine, is independent of the other or others.
  • the invention consists in that arbitrarily a copying tool support or a grinding head with a swivelling copying roller is attached to a longitudinally movable and radially turnabie control element which is preferably in the shape of a horizontally disposed column which, notwithstanding this horizontal position, will hereinafter be referred to as column. It must be understood, however, that a vertical column may be provided if the construction of the machine allows for such.
  • the rectilinear movement of the said column in its longitudinal direction serves to carry out the shaping or grinding stroke, while its radial swinging movement serves for the lateral feed of the tool or tools during the copying operation.
  • the mutual vertical adjustment of the respective copying tools together with the copying roller for the approach of the tool toward the blade to be operated upon, with an additional tool lift by raising the copying roller as by means of a differential piston, is initiated by electro-hydraulic means by which the entire cycle of operations is controlled in order to enable a steady automatic flow of operations.
  • a preferred embodiment of the machine in accordance with the invention consist of a plurality of self-contained copying units for shaping the profiles of one or two blades per unit, whereby the machine may be designed as a oneor twostage machine with a common hydraulic and cooling means installation.
  • Its main object is a more economic and uniform production of the turbine blade profiles, particularly of Nimonic-alloys or other hard materials, such as are used in the gears of aeroengines for instance.
  • the templates from which the turbine blades are copied may be made of suitable synthetic or the like material, since the working pressure of the copying roller can be regulated as desired, which offers particularly economic advantages in the production of such small series.
  • FIG. 1 is a side view of the machine
  • FIG. 2 is a front view of the machine shown in FIG. 1,
  • FIG. 3 shows the front view of a multiple-stage copying machine with three copying units and a common hydraulic control.
  • FIG. 4 is a section through a complete unit with its shaping tool in the position of rest
  • FIG. 5 is a longitudinal section through a copying unit with its shaping tool and copying roller in working position and FIG. 6 a similar view of the same unit with the shaping tool raised and the copying roller in its return position.
  • FIG. 7 is a cross section through the radial feed driving means.
  • FIG. 8 shows a cross section through the control means for the limitation of the working stroke.
  • FIG. 9 is a longitudinal section through the copying unit with a groove milling device for machining the foot grooves of the blades.
  • FIG. 10 is a section through the unit similar to FIG. 9 with a grinding device for grinding the blade profiles.
  • FIG. 11 diagrammatically illustrates the movement of the copying tool for inside copying
  • FIG. 12 the same for outside copying the blades
  • FIG. 13 is a diagram of the inside copying movements of the tool on two blades in one operation.
  • FIG. 14 illustrates the hydraulic diagram for the automatic working cycle of a copying unit
  • FIG. 15 is a horizontal section through the copying slide.
  • the machine in its major parts, consists of the machine bed or standard 1 and the copying unit or units 2.
  • the hydraulic installation which is indicated by the numeral 3, also the circulating pump 4 for the hydraulic fluid, the cooling equipment 5 and the electro-hydraulic controls denominated at 6.
  • the machine bed may be designed for one or several copying units whereby the combined hydraulic installation 3 and circulating pump 4 including the cooling means 5 may serve for either one unit only or commonly for all.
  • the casing 7 of the copying unit as shown in FIG. 4, as also the ground plate -8 with the copying or master template 9 of the blade profile attached to it, and the clamp 10 for the blade to be operated upon.
  • the special profile of the template 9 is somewhat larger in its length at both sides than the length of the turbine blade itself, in order to provide sufiicient room for the copying roller to run out.
  • the horizontally disposed column 13 within which a cylinder 14 is fixed in position, wherein a piston 15 is adapted to reciprocate. This piston is rigidly held in a cover 16 by means of a nut 17.
  • the cover 16 is screwed to the casing 7 by means of screws 18. It is provided with two channels 19 and 13' through which the pressure medium, usually oil, is able to pass so that, according to which of these channels is under pressure, the piston 15 is acted upon on either on its right or left side in order to move the column to the fore or to the aft as required.
  • the pressure medium usually oil
  • a longitudinal groove 20 in which a rack 21 is positioned so as to be capable of longitudinal movement.
  • the said rack 21 is held by means of a projection 23 in a' circular notch 22 of the column 13 so that, when the column moves lengthways, the rack 21 is caused to join in the movement and to also move in the same direction.
  • a pinion 24 as will be seen from FIG. 8, which pinion is fixed to the shaft 25 of the control disc 26, which is provided with control earns 27 for the limitation of the stroke of the column 13.
  • the control cams 27 actuate the electric switch which, on its part, actuates the electro-hydraulic control valve (FIG. 1), whereby the required stroke of the column 13 becomes adjusted in conformity with the length of the copying stroke.
  • FIG. 4 shows the arrangement of the piston pump 31 together with its oil pressure conduits 32, 33 and 34 is diagrammatically illustrated.
  • FIG. 7 shows the control for the radial movement of the column 13 for the cross feed in the progress of copying.
  • a guide ring 35 which is turnably held in a box 36 (FIG. 4).
  • Two ball or roller bearings 38 and 38 are carried on two pins 37, 37' extending inwardly from the ring 35 in mutually opposite direction (FIG. 7).
  • the column 13 is provided along the whole of its length with guide surfaces 39 and 39 so that, when the ring 35 turns, column 13 will also turn owing to the ball bearings 38 and 38' being in contact with these surfaces.
  • a piston 40 mounted in the lower part of the box 36 is a piston 40 which is formed along its upper portion as a rack 41.
  • Ring 35 is formed at its lower part with a toothed segment 42 which causes the ring 35 to tum on the piston being acted upon by pressure from the oil chambers 43 or 43'. In this way the speed of the piston and, consequently, the radial movement of the column 13 can be adapted to the cross feed of the copying tool or tools. Further on the guide ring 35 and adjustably fitted to the upper part thereof are two abutments 44 and 44' which, during the oscillating movement of the ring 35, alternately actuate an electric contact member 45 and thereby enable the hydraulic reverse of the piston 40.
  • the copying slide 46 is vertically movable in guides 13 (FIG. 15). It moves in preferably hardened guides 97' and 97" in which it can be accurately adjusted by wedges 98 and 98.
  • Journalled in this copying slide 46 is a shaft 47 (FIG. 4) and, capable of rocking movement thereon, the block 48 for supporting the copying roller 12.
  • a piston 49 is fitted within the copying slide 46.
  • the cylinder within which this piston is adapted to move, is closed at its top by a cover 50.
  • Another piston 51 is adapted to reciprocate in a cylinder 54, which is rigidly attached to the column 13.
  • FIG. 4 the copying slide is shown in its position of rest in which it is held partly by the pressure of the oil in the chamber '53 and partly by the chain 60 and spring 61.
  • FIG. 5 shows the parts in their working position, the copying stroke having the direction indicated by the arrow a in that figure. Piston 51 is pressed downwardly by the constant pressure of the oil in chamber 52 until the copying roller 12 comes to bear on the template 9.
  • FIGS. 11 and 12 illustrate the turning movement of the copying tool 56 inside and outside of the turbine blade to be copied.
  • FIG. 13 diagrammatically indicates the procedure on two blades simultaneously by the movement of the tool 56.
  • FIG. 14 diagrammatically illustrates the hydraulic control of a copying unit in accordance with the invention.
  • the oil is conveyed from the container 62 by a pump 63 via a check valve 64 into the pressure regulating valve 65, from which it passes partly through the reversing valve 66 to the piston 51 of the copying slide of one unit, and partly to the difierential piston 49 for the lifting of the copying tool 56 in the return motion of the column 13.
  • the control of the piston 49 during the return of the column takes place over the electro-magnetic or solenoid valve 67.
  • the oil then passes from the check valve 64 over the electro-magnetic valve 68, the reversing valve 69 and the pressure regulating valve 71 to the piston 40 (FIG. 7) for the turning movement of the copying unit.
  • Another pressure conduit via the control valve 71 and the solenoid valve 29 to the cylinder 14 and piston 15, whereby the oil is returned over the throttle valve 72 of the stroke speed adjustment into the oil container 62.
  • FIG. 9 illustrates in a diagrammatic way the copying slide 46 as equipped with a groove milling cutter 76 instead of the shaping tool 56 just referred to.
  • a corresponding template may be used.
  • the copying roller 73 is turnable on a short-shaft 74 in the block or holder 75 which is adapted to rock about the shaft 47 similar to the aforedescribed block 48.
  • the milling cutter 76 on shaft 77 is driven by a motor 83 over the gear wheels 78, 79, 80, 81, and 82, which are positioned in a vertically adjustable gear box 84, and may be adjusted in its position of height by means of the screw spindle 85 which is provided with a graduated scale head 86 so that the shaft of the milling cutter 76 and that of the copying roller can always be held on the same level.
  • the vertical approach and the return of the copying slide 46 is effected over the piston 51.
  • the copying slide 46 is shown to be provided with a grinding device instead of the copying tool equipment heretofore described; the copying roller 12 and its holder 48, however, being maintained.
  • the grinding wheel 87 is carried in a vertically slidable tubular holder 88.
  • the adjusting spindle 89 is provided with two different screw threads, of which the thread 90 has only about half the pitch of the thread 90. The purpose of this is when trimming the grinding wheel by means of the diamond 91 as by screwing the scale knob 92, the holder 88 can be adjusted by an analogous amount downwardly in order to ensure the height of the grinding wheel being the same as that of the copying roller 12.
  • the grinding wheel 87 is driven by means of compressed air or the cooling medium passing through a pipe 93 and a passage 94 to a turbine 95 which is coaxial with the grinding wheel 87 on a shaft 96 in rigid connection therewith.
  • the operation of the machine is as follows:
  • the work piece, namely a turbine blade 11, is held in the machine by the clamp 10 opposite the template 9.
  • a longitudinal movement of the column 13 to which the copying slide with its copying tool is attached so as to be capable of vertical movement thereon, starts the copying movement.
  • the entire holder 55 has to be exchanged, so that the exact position of depth of the tool 56 can be maintained without thereby atfecting the output of the machine.
  • Piston 51 presses the copying slide 46 down until the roller 12 contacts the template 9, the lower face of the copying roller thereby taking the same position of height as the cutting point of the shaping tool 56.
  • the cutting tool 56 will carry out the movements prescribed by the curves on the template and transmit them directly to the turbine blade 11. Inasmuch as the turbine blade requires a cross feed of the copying tool, this is caused by a radial movement of the column 13 by the feed piston 40, whereby an image of the template 9 is transmitted to the turbine blade 11.
  • the pressure on the difierential piston 49 increases and lifts the tool 56 off the work.
  • the length of the movement of the column 13 in accordance with the blade 11 can be set by the adjustment cams 27, while its radial movement in accordance with the width of the blade is adjustable by means of the cams 44 and 44'. These cams are designed to actuate the electric control means for the operation of the machine.
  • a milling unit 84 with a groove cutter 76 may be fitted to the copying slide, which is preferably driven by a separate motor 83.
  • Such milling tool is particularly serviceable for cutting the foot grooves of the blades 11 in order to provide a run-out for the shaping tool.
  • the width of the groove may be as required, the normal width being three to ten millimeters.
  • the axis of the copying roller 73 in this case, is positioned parallel to the axis of the column 13, and the longitudinal movement of the latter is used for setting the distance between the grooves of the turbine blade. For this operation only the radial feed of the column 13 by the piston 40 need be actuated.
  • the aforesaid copying means may also be exchanged against a grinding device which is likewise fitted to the copying slide 46 and is provided with a grinding wheel 87 which may be driven by compressed air or by the cooling medium through the turbine to which the grinding wheel may be directly coupled.
  • the copying roller in this case, is arranged parallel to the shaping tool unit.
  • the turbine blades 11 are ground down to the allowances specified in each particular case. Feed in both directions, straight and radial, is the same as with the use of a shaping tool.
  • the device in accordance with the invention renders the simultaneous operation of several units at a comparatively small consumption of space on a common machine bed possible. Also in this case various copying methods may be employed arbitrarily on the same machine such as shaping, milling or grinding and by using the same templates for all operations.
  • a turbine blade copying machine comprising a machine bed adapted for mounting thereupon at least one copying unit, a clamping device for a turbine blade and spacedly aligned therewith, holding means for a template the shape of which, except for its length, corresponding exactly with that of said turbine blade to be machined, said copying unit comprising a housing, a ram horizontally supported therein, hydraulic means for axially reciprocating said ram and hydraulic means for radially moving said ram about its axis, a vertically movable slide carrying a tool head, said slide being mounted on one end of said ram, a lever pivotally mounted on a horizontal shaft disposed at the lower end of said slide, a copying roller aligned with the tool and rotatably mounted on a shaft arranged in parallel, spaced relation to said pivoting shaft on said pivoting lever, means resiliently urging said pivoting lever against an abutment disposed on said slide, a hydraulically operated first piston slidingly arranged within a cylinder fastened to the end
  • a turbine blade copying machine comprising a machine bed adapted for mounting thereupon at least one copying unit, a clamping device for a turbine blade and spacedly aligned therewith, holding means for a template the shape of which, except for its length, corresponding exactly with that of said turbine blade to be machined, said copying unit comprising a housing, a hollow ram of substantially circular cross section horizontally supported in said housing, a hydraulically operated cylinder coaxially and fixedly arranged at one end within said ram, a piston within said cylinder having a piston rod rigidly connected with the housing of said copying unit, hydraulic channels extending through said piston rod communicating with the cylinder spaces on both sides of said piston being alternatingly pressurized for reciprocating said ram, a hydraulic cylinder arranged below said ram within said housing of the copying unit the axis of which lying at a right angle to the axis of said ram, a piston sliding in said last named cylinder for rotating said ram the middle portion of which forming a rack meshing with

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US824617A 1958-07-11 1959-07-02 Turbine blade copying machine Expired - Lifetime US3027814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH6167358A CH368042A (de) 1958-07-11 1958-07-11 Turbinenschaufel-Kopiermaschine

Publications (1)

Publication Number Publication Date
US3027814A true US3027814A (en) 1962-04-03

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US824617A Expired - Lifetime US3027814A (en) 1958-07-11 1959-07-02 Turbine blade copying machine

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US (1) US3027814A (de)
CH (1) CH368042A (de)
FR (1) FR1234359A (de)
GB (1) GB892745A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4578006A (en) * 1979-05-16 1986-03-25 Borg-Warner Corporation Impeller under file machine
EP0695511A2 (de) 1994-08-01 1996-02-07 General Electric Company Gesichtsmaske mit verbesserter Abdichtung und Verfahren
EP0700971A2 (de) 1994-09-12 1996-03-13 General Electric Company Polycarbonatmischung zum Giessen von Gegenständen mit geringem Glanz
EP0711810A1 (de) 1994-11-14 1996-05-15 General Electric Company Autoklavenbeständige Zusammensetzungen aus Polyestercarbonat- und Polyetherimidharzen
US5759689A (en) * 1996-06-13 1998-06-02 General Electric Company Coextruded polycarbonate sheet with improved weathering
US5883194A (en) * 1995-04-08 1999-03-16 General Electric Company Polycarbonate or polyestercarbonatel acrylic resin or methacrylic/resin/catalyst composition
EP0934968A2 (de) 1998-02-04 1999-08-11 General Electric Company Polycarbonatgegenstände mit photochromischen Eigenschaften
US5948876A (en) * 1997-10-20 1999-09-07 General Electric Company Polyphenols as polycarbonate branching agents
US6022941A (en) * 1998-04-01 2000-02-08 General Electric Company Branched polycarbonate produced by reactive extrusion
US6160082A (en) * 1997-11-05 2000-12-12 General Electric Company Process for branching thermoplastic linear polycarbonate resins
CN115157011A (zh) * 2022-09-02 2022-10-11 佛山市彗宸精密机械科技有限公司 低间隙跟随式贴合仿形加工装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2349171A (en) * 1940-08-03 1944-05-16 Rockford Machine Tool Company Machine tool
US2357790A (en) * 1941-07-26 1944-09-05 Turchan Manuel Hydraulic duplicating planer attachment
US2548180A (en) * 1945-03-26 1951-04-10 Charles Rosenthal Automatic variable feed attachment for shapers
US2618203A (en) * 1949-07-25 1952-11-18 Robert W Hyman Rotary planer attachment
US2826123A (en) * 1955-01-01 1958-03-11 Birmingham Small Arms Co Ltd Copying machines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2349171A (en) * 1940-08-03 1944-05-16 Rockford Machine Tool Company Machine tool
US2357790A (en) * 1941-07-26 1944-09-05 Turchan Manuel Hydraulic duplicating planer attachment
US2548180A (en) * 1945-03-26 1951-04-10 Charles Rosenthal Automatic variable feed attachment for shapers
US2618203A (en) * 1949-07-25 1952-11-18 Robert W Hyman Rotary planer attachment
US2826123A (en) * 1955-01-01 1958-03-11 Birmingham Small Arms Co Ltd Copying machines

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4578006A (en) * 1979-05-16 1986-03-25 Borg-Warner Corporation Impeller under file machine
EP0695511A2 (de) 1994-08-01 1996-02-07 General Electric Company Gesichtsmaske mit verbesserter Abdichtung und Verfahren
EP0700971A2 (de) 1994-09-12 1996-03-13 General Electric Company Polycarbonatmischung zum Giessen von Gegenständen mit geringem Glanz
EP0711810A1 (de) 1994-11-14 1996-05-15 General Electric Company Autoklavenbeständige Zusammensetzungen aus Polyestercarbonat- und Polyetherimidharzen
US5521258A (en) * 1994-11-14 1996-05-28 General Electric Company Autoclave resistant blends of poly(ester-carbonate) and polyetherimide resins
US5883194A (en) * 1995-04-08 1999-03-16 General Electric Company Polycarbonate or polyestercarbonatel acrylic resin or methacrylic/resin/catalyst composition
US5759689A (en) * 1996-06-13 1998-06-02 General Electric Company Coextruded polycarbonate sheet with improved weathering
US5948876A (en) * 1997-10-20 1999-09-07 General Electric Company Polyphenols as polycarbonate branching agents
US6087468A (en) * 1997-10-20 2000-07-11 General Electric Company Method of branching and cross-linking a polycarbonate resin
US6160082A (en) * 1997-11-05 2000-12-12 General Electric Company Process for branching thermoplastic linear polycarbonate resins
EP0934968A2 (de) 1998-02-04 1999-08-11 General Electric Company Polycarbonatgegenstände mit photochromischen Eigenschaften
US6114437A (en) * 1998-02-04 2000-09-05 General Electric Company Polycarbonate articles with photochromic properties
US6022941A (en) * 1998-04-01 2000-02-08 General Electric Company Branched polycarbonate produced by reactive extrusion
CN115157011A (zh) * 2022-09-02 2022-10-11 佛山市彗宸精密机械科技有限公司 低间隙跟随式贴合仿形加工装置
CN115157011B (zh) * 2022-09-02 2022-11-15 佛山市彗宸精密机械科技有限公司 低间隙跟随式贴合仿形加工装置

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Publication number Publication date
FR1234359A (fr) 1960-10-17
CH368042A (de) 1963-03-15
GB892745A (en) 1962-03-28

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