Method for mechanical treatment of back edge of turbomachine blade

FIELD: machine engineering.

SUBSTANCE: blade profile is determined by the digital theoretical model. The workpiece is prepared with an outsize along the back edge of the blade relative to the theoretical profile and the mentioned outsize is removed by adaptive mechanical treatment, including positioning the workpiece in the reference machine coordinate system, sounding the position coordinates of the given points (Ni) on the first side of the workpiece along its back edge, determining position deviation (delta Ni) of the given points (Ni) from their positions specified by the theoretical model, splitting the workpiece side into the treatment cells. The vertices of the cells are determined on the basis of the positions of the mentioned points (Ni), determining the amount of the workpiece material taken from the cell surface relative to their vertices and taking into account the mentioned position deviations (delta Ni) and blade treatment.

EFFECT: invention use allows to improve the accuracy of the blade production.

12 cl, 8 dwg

 



 

Same patents:

FIELD: process engineering.

SUBSTANCE: set of inventions relates to machine building and can be used for cutting with in-feed. Cutting head comprises base surface, side area connected therewith, upper area connected with side area and lower feet arranged at said top surface. It includes cutting edges to contact with workpiece to remove the material and to extend from upper area central point to periphery of upper area and located at the angle to base plane, approximately perpendicular to said axis. Central parts of cutting edges are located at larger distance from base surface along the axis than their peripheral parts. Cutting process comprises spinning of cutting head at its feed to workpiece. Material is removed from workpiece by front blades arranged at cutting head front surface. Tool holder is bent to direct cutting head inside the workpiece. Cutting head displacement towards the workpiece is terminated when cutting head reaches preset depth inside work piece. Spinning head is withdrawn from workpiece inside for material removal therefrom.

EFFECT: higher surface quality and tool hardness.

45 cl, 3 tbl, 23 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to cutting by abrasive water jet. The part is continuously cut from disc-shaped material block with the help of ejection head arranged opposite the block first opposite outer surface. Continuous cutting is performed with making of connecting line between the block second outer surface opposite said first surface and the block cut-out surface. At least, one cutting of part is executed on, at least a part of block depth including at least the part of said connection line with the help of said ejection head located opposite said second outer surface of the block.

EFFECT: higher rate of cutting.

9 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of single-unit vaned disc. Material block is cut out by abrasive water jet to disc shape to remove material from the block at the level of spaces between vanes for form blade workpiece extending radially from the hub. Note here that said cutting of material block comprises the first three-axis cutting out of the part extending over the block depth so that cut-out part falls from the block automatically, by gravity, and at least one widening cutting out.

EFFECT: higher efficiency of production.

9 cl, 5 dwg

FIELD: heating.

SUBSTANCE: invention relates to a fan header and method of its manufacturing. With the help of a laser they cut shells, flanges in the form of a circumference segment, connection flanges and stands in the form of stiffening ribs. Flanges and stands are made with T-shaped slots, and shells - with response cogs. Flanges in the form of the circumference segment, connection flanges and stands in the form of stiffening ribs are welded into metal frames. Frames are fixed to shells by means of joint cogs in T-shaped slots and welding in points of jointing to form sectors. Then the produced structure undergoes hot galvanisation.

EFFECT: increased durability of a product due to fine cutting of a header and a shell blanks, and hot galvanisation of items.

3 cl, 4 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used for producing gas turbine blades. Proposed method proceeds from selection of spindle safe rpm to rule out the resonance between cutter oscillation frequencies acting the machined surface and machined blade intrinsic frequency loaded in machining control programs. Machining consists in cutting machining allowance in area-by-area manner using said control programs.

EFFECT: machining of relatively small-depth blades at marked axial size, fast machining.

12 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used for producing gas turbine blades. Proposed method comprises milling of blade body at five-access NC machine. Translation and periodic feed are imparted to cutter to scan line in blade blank along blade blank axis in the form of parallelepiped to be turned relative to the cutter. Blank is clamped in appropriate appliance at the machine horizontal table vertically relative to said table. Cutter is brought to initial contact with blade surface for milling the blade butt and pre-milling of blade elements located in compressor wheel space in at least five passes with the help of cylindrical end and peripheral parts. Then, blank is located vertically relative to machine horizontal table to remove machining riser. Blank is cut to shape blade butt or butt with extra structural elements with the help of taper mill in at least one pass at cutter axis deviation from perpendicular to cutter feed direction and in the plane perpendicular thereto with the help of taper and cylindrical mill in at least two passes in milling the blade with extra structural elements.

EFFECT: simple and fast production.

4 cl, 1 tbl, 8 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of gas turbine blades. In compliance with this method, blades are produced by making channels in blade body to fit inserts of copper alloy therein. Then, blank is forged and said inserts are withdrawn by chemical dissolution.

EFFECT: fast and efficient production, higher mechanical and chemical properties.

5 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to power engineering and can be used for production of rotary pump impellers with OD not over 400 mm and complex shape of intervane channels. Impeller base disk is made integral with the half of total quantity of vanes arranged next but one. Cover disk is made integral with the other half said quantity of vanes. Note here that said disks have slots on surfaces engaged with vanes while the latter have ledges. Said disks are assembled so that intervane channels are formed. In assembly, vane ledges are fit in disk slots to allows transfer of torque there between. Base and cover disks are welded together. Weld joint is performed at disk slots, for example, on their outer surface. Said slots may be symmetric about impeller rotational axis.

EFFECT: higher quality of impellers, simplified production.

3 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used in machining gas turbine engine blade root, particularly, rotor blade aerodynamic models with small thickness and axial sizes of 200-300 mm. Proposed method comprises defining amount of work-in-process stock and using butt toroidal mill to be displaced equidistantly to machined surface. First, blade one side is finished. Then, support is jointed to machined blade on machined surface side to add to blade stiffness. Resulted assembly is finished to detach said support from machined blade. For this, support made from light alloys is used, its thickness being selected subject to necessity in ruling out blade deformation by cutting force and calculated in support every section with due allowance for margin of strength.

EFFECT: higher efficiency and quality.

2 cl, 6 dwg

FIELD: power engineering.

SUBSTANCE: nozzle blade comprises radial inner and outer walls with a section of an aerodynamic surface stretching between the inner and outer walls. The inner wall is made with a mounting element on its surface levelled with a longitudinal central axis via the nozzle blade. The first rotary fastening element of the clamping accessory is made as capable of engagement with the mounting element of the inner wall of the nozzle blade. In the other version the clamping accessory for mechanical treatment of the nozzle blade comprises universal mounting elements on the nozzle blade and the clamping accessory for mechanical treatment. The mounting element on the blade is arranged as capable of levelling the blade with the central axis of a machine, around which the blade rotates during mechanical treatment as the mounting element on the blade is engaged with the mounting element on the clamping accessory for mechanical treatment.

EFFECT: inventions make it possible to simplify a clamping accessory, to increase accuracy of mechanical treatment and also to increase reliability of a nozzle blade.

11 cl, 14 dwg

FIELD: process engineering.

SUBSTANCE: set of inventions relates to machine building and can be used for cutting with in-feed. Cutting head comprises base surface, side area connected therewith, upper area connected with side area and lower feet arranged at said top surface. It includes cutting edges to contact with workpiece to remove the material and to extend from upper area central point to periphery of upper area and located at the angle to base plane, approximately perpendicular to said axis. Central parts of cutting edges are located at larger distance from base surface along the axis than their peripheral parts. Cutting process comprises spinning of cutting head at its feed to workpiece. Material is removed from workpiece by front blades arranged at cutting head front surface. Tool holder is bent to direct cutting head inside the workpiece. Cutting head displacement towards the workpiece is terminated when cutting head reaches preset depth inside work piece. Spinning head is withdrawn from workpiece inside for material removal therefrom.

EFFECT: higher surface quality and tool hardness.

45 cl, 3 tbl, 23 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used for producing gas turbine blades. Proposed method proceeds from selection of spindle safe rpm to rule out the resonance between cutter oscillation frequencies acting the machined surface and machined blade intrinsic frequency loaded in machining control programs. Machining consists in cutting machining allowance in area-by-area manner using said control programs.

EFFECT: machining of relatively small-depth blades at marked axial size, fast machining.

12 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used for producing gas turbine blades. Proposed method comprises milling of blade body at five-access NC machine. Translation and periodic feed are imparted to cutter to scan line in blade blank along blade blank axis in the form of parallelepiped to be turned relative to the cutter. Blank is clamped in appropriate appliance at the machine horizontal table vertically relative to said table. Cutter is brought to initial contact with blade surface for milling the blade butt and pre-milling of blade elements located in compressor wheel space in at least five passes with the help of cylindrical end and peripheral parts. Then, blank is located vertically relative to machine horizontal table to remove machining riser. Blank is cut to shape blade butt or butt with extra structural elements with the help of taper mill in at least one pass at cutter axis deviation from perpendicular to cutter feed direction and in the plane perpendicular thereto with the help of taper and cylindrical mill in at least two passes in milling the blade with extra structural elements.

EFFECT: simple and fast production.

4 cl, 1 tbl, 8 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metal cutting and may be used in milling gas turbine blisk vanes by end mills at NC tools. Proposed method comprises roughing and finishing. In roughing, blade channels are cut in radial direction. Roughing is carried out so that every channel has variable width decreasing in direction of blisk hub while vane root profile resulted from roughing features machining allowance increasing toward blisk hub. Prior to finishing, vane root profile with said allowance is conditionally divided in height to 2-4 sections. Vane root profile is finished by sequential milling of every said section of vane height.

EFFECT: higher precision.

3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used in machining gas turbine engine blade root, particularly, rotor blade aerodynamic models with small thickness and axial sizes of 200-300 mm. Proposed method comprises defining amount of work-in-process stock and using butt toroidal mill to be displaced equidistantly to machined surface. First, blade one side is finished. Then, support is jointed to machined blade on machined surface side to add to blade stiffness. Resulted assembly is finished to detach said support from machined blade. For this, support made from light alloys is used, its thickness being selected subject to necessity in ruling out blade deformation by cutting force and calculated in support every section with due allowance for margin of strength.

EFFECT: higher efficiency and quality.

2 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used in milling complex configuration parts with alternation of ledges and grooves, particularly, in making bladed integrated discs of radial- or axial-flow vane machines. Proposed method comprises milling whereat cutter is revolved and fed in direction aligned with cutter rotational axis to make cutting passes within the specified groove boundaries to produce channels. Cutting passes are carried out using cutters with decreasing diameter of working part selected subject to design diameter of working part required for producing maximum surface area formed by cutter cutting edge in contact with blank machined surface. Cutting passes are performed at wider side of the groove to allow the cutter to reach preset length of cutting pass.

EFFECT: higher efficiency.

6 cl, 1 ex, 4 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used for machining propeller screw blades, vanes of gas, steam or hydraulic turbines. Device base accommodates machining tool with tool drive and workpiece locating assembly composed of multilink manipulator. Said workpiece locating assembly composed of multilink manipulator serves to displace tool rotary drive in horizontal plane. Said workpiece locating assembly comprises driving link articulated with aforesaid base via horizontal rectilinear pair engaged with balanced driven link engaged therewith by rotary pair and driven by workpiece rotary drive.

EFFECT: higher precision, expanded machining performances.

1 dwg

FIELD: machine building.

SUBSTANCE: procedure is implemented at machines with numeric programmed control and consists in rough processing in form of cutting lots of uniform width in radial direction and in finish treatment by milling channel section of blades under modes conditioned by value of allowable deformation of processed surface. Thickness of line at finish milling does not exceed length of a cutting section of a tool coinciding with generatrix of blade profile. Cut in by height of profile is carried out gradually from a top of the blade to radius of transition into a hub. Also, the cutter is transferred along a closed trajectory equidistant to profile of a suction face and pan of blade in plane of line.

EFFECT: upgraded accuracy.

2 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: proposed method comprises determining amount of stock removal in one pass of milling cutter transferred equidistant relative to machined surface. Machining is carried out by milling cutter face. Note here that prior to milling, cross section area of removed stock and cutting tangential force in finishing during multipass stock removal are determined. Milling is performed with determined cutting force. Note that milling interval is chosen such that areas of chips cross section in finishing during multipass mulling and single pass milling are equal. Milling cutter may be fed along spiral line relative to machined surface to allow smooth transition from blade body to foot.

EFFECT: higher accuracy and lower labor input.

2 cl, 2 dwg, 1 tbl

FIELD: machine building.

SUBSTANCE: method relates to five-coordinate milling wherein hob is moved relative to the part along at least one certain milling trajectory to produce 3D-shape surface. Note that used hob has working head diametre exceeding the hob shank radius. Parametres of ball finger hob with the hob working head radius corresponding to its shank radius are used to determine first milling trajectories, which make auxiliary milling trajectories to determine second milling trajectories. Proposed hob has a shank and working head with radius reckoned from the center located outside the shank. Note that the difference between the working head radius and that of shank is selected to facilitate determining second milling trajectories.

EFFECT: higher efficiency.

12 cl, 2 dwg

FIELD: metal cutting processes and equipment, milling by means of end milling cutter blades of one-piece impellers of gas turbine engines in number program control machine tools.

SUBSTANCE: method comprises steps of rough working for cutting inter-blade grooves of the same width in radial direction and finishing for milling blade along height. Both types of working are performed at one mounting operation. In order to improve accuracy, working is performed along lines and depth of each line is set more than thickness of deformed layer of blank after previous working. For each line deformation value of worked surface of impeller is set more than deformation value of worked surface after working i-line.

EFFECT: enhanced accuracy of working.

4 cl, 5 dwg

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