US20220032425A1 - Method for surface processing of a component by flow grinding - Google Patents

Method for surface processing of a component by flow grinding Download PDF

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Publication number
US20220032425A1
US20220032425A1 US17/279,451 US201917279451A US2022032425A1 US 20220032425 A1 US20220032425 A1 US 20220032425A1 US 201917279451 A US201917279451 A US 201917279451A US 2022032425 A1 US2022032425 A1 US 2022032425A1
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Prior art keywords
flow
duct
hydraulic diameter
fluid carrier
carrier material
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Abandoned
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US17/279,451
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English (en)
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Mathias Weickert
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BASF SE
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BASF SE
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Assigned to BASF SE reassignment BASF SE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEICKERT, Mathias
Publication of US20220032425A1 publication Critical patent/US20220032425A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
    • B24C3/327—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes by an axially-moving flow of abrasive particles without passing a blast gun, impeller or the like along the internal surface
    • 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
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/006—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor for grinding the interior surfaces of hollow workpieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks

Definitions

  • the invention proceeds from a method for the surface processing of a component by flow grinding, comprising the following steps:
  • Flow grinding processes are processing processes in which a surface to be processed is flooded by a fluid carrier material containing grinding particles, in particular a liquid containing grinding particles.
  • the grinding particles contained in the fluid carrier material strike the surface of the component to be processed during the flooding operation, as a result of which the corresponding surface is abraded by erosion in that the grinding particles remove material from the component upon impact.
  • the fluid carrier material is a liquid
  • the flow grinding process is also referred to as a hydroerosive process or a hydroerosive grinding process.
  • Flow grinding processes can be used for example to treat the surfaces of 3D-printed components of metal, ceramic and/or plastic that have a surface roughness of between 50 and 500 ⁇ m. These surface roughnesses bring about undesired effects when the corresponding components are being used, for example fouling or increased loss of pressure.
  • the geometry of the component In order to be able to maintain the exact geometry within the error tolerances after the grinding process, the geometry of the component must optionally be modified already in the case of the production process, in particular during production by a 3D-printing process, and it has to be possible to adjust the grinding process in a precise and controlled manner.
  • WO 2014/000954 A1 discloses, for example, chamfering bores on injection nozzles in injection valves for internal combustion engines by a hydroerosive process, in order in this way to abrade sharp-edged transitions at the very small bores, through which the fuel is injected into the internal combustion engine at high pressure.
  • a liquid containing grinding particles flows through the injection nozzle.
  • a hollow body is introduced into the injection valve and the liquid containing grinding particles is conducted through the internal flow duct formed in the hollow body and an external flow duct formed between the hollow body and the inner wall of the injection valve.
  • the known method is disadvantageous in that, in the case of non-planar surfaces to be processed, what can occur is a flow separation which results in cavitation and thus undesired removal of material, and therefore can lead to damage to the surface to be processed and a mathematical simulation of the grinding is complicated.
  • the object is achieved by a method for the surface processing of a component by flow grinding, comprising the following steps:
  • the fluid carrier material which contains the grinding particles is for example water, oil or a highly viscous grease, i.e. a grease having a viscosity in the range of from 100 to 1 000 000 Pa ⁇ s, in particular having a viscosity in the range of from 1000 to 200 000 Pa ⁇ s, at the processing temperature. It is particularly preferred if the fluid carrier material is oil, in particular a hydraulic oil.
  • the proportion of the grinding particles in the fluid carrier material is preferably in the range of from 1 to 80% by volume, in particular in the range of from 2 to 60% by volume.
  • the proportion of the grinding particles is preferably in the range of from 1 to 50% by volume, more preferably in the range of from 1 to 20% by volume and in particular in the range of from 1 to 5% by volume, and, when using a highly viscous grease as fluid carrier material, the proportion of the grinding particles is preferably in the range of from 20 to 80% by volume and in particular in the range of from 40 to 60% by volume.
  • the material used for the grinding particles depends on the material of the component to be processed.
  • grinding particles of boron carbide or diamond are preferably used.
  • suitable in particular are grinding particles of boron carbide, diamond, sand or silicon.
  • the form and the size of the grinding particles also depend on the material of the component that is to be processed and on the desired surface finish, in particular the desired surface roughness, and the size of the structure to be processed.
  • Suitable forms for the grinding particles are in particular sharp-edged particles, for example crushed particles.
  • Suitable grinding particles preferably have a size distribution of 1 to 1000 ⁇ m and in particular a size distribution of 1 to 10 ⁇ m when using oil and 10 ⁇ m to 1000 ⁇ m when using grease.
  • the component For processing by flow grinding, firstly the component is introduced into a duct through which the fluid carrier material containing the grinding particles flows.
  • the component When the intention is to process external surfaces of the component, the component is introduced into the duct such that the fluid carrier material containing the grinding particles can flood the surfaces.
  • the component When processing internal surfaces, for example bores, the component is connected to the duct such that the fluid carrier material containing the grinding particles flows through the openings, for example bores, to be processed, but does not come into contact with surfaces which are not intended to be processed.
  • suitable connections can be provided on the component, via which connections the fluid carrier material containing the grinding particles is supplied and flows back out of the component.
  • the blank is rounded at the positions at which, during flooding, the flow direction of the fluid carrier material containing the grinding particles changes with a radius which corresponds to 0.1 to 2.5 times the mean spacing between the surface over which flow passes and the opposite wall of the duct through which the fluid carrier material containing the grinding particles flows.
  • the blank is rounded at the positions at which, during flooding, the flow direction of the fluid carrier material containing the grinding particles changes with a radius which corresponds to 0.25 to 1.5 times and in particular 0.5 times the mean spacing between the surface over which flow passes and the opposite wall of the duct through which the fluid carrier material containing the grinding particles flows.
  • the mean spacing can for example be determined numerically. It is preferable, however, if the mean spacing is the mean value of the minimum spacing between the surface over which flow passes and the opposite wall and the maximum spacing between the surface over which flow passes and the opposite wall. In this case, the minimum spacing and the maximum spacing can both lie upstream of the change in the flow direction or both lie downstream of the change in the flow direction, or one of the two spacings lies upstream of the change in the flow direction and the other of the two spacings lies downstream of the flow direction. In particular in the case of a duct through which flow passes which comprises a change in direction, it is possible for example that the duct has a first hydraulic diameter upstream of the change in direction and a second hydraulic diameter downstream of the change in direction. In this respect, the first hydraulic diameter can be smaller than the second hydraulic diameter, or the first hydraulic diameter is larger than the second hydraulic diameter.
  • hydraulic diameter is calculated as follows:
  • D h is the hydraulic diameter
  • U is the circumference
  • A is the cross-sectional area of the duct though which flow passes.
  • a change in the flow direction of the fluid carrier material containing the grinding particles results, for example, when a duct, into which the blank is introduced and through which the fluid carrier material containing the grinding particles flows in order to process the external surfaces of the blank, has a curvature or a bend and the blank to be processed is positioned in the region of the curvature or the bend. Furthermore, a change in the flow direction also results when the blank contains a duct and this duct has a curvature or a bend, and the intention is to process the walls which bound the duct by the flow grinding method. In this case, the fluid carrier material containing the grinding particles flows through the duct in the blank.
  • the blank When the intention is to process external surfaces of the blank by the flow grinding process, the blank is customarily positioned in a duct which runs in a straight line without a bend or curvature and without a constriction or widening.
  • additional material is attached at positions at which a flow separation occurs on the finished component.
  • the additional material on the side facing the flow has a surface which is inclined and runs concavely in the flow direction with respect to a central axis of the duct in which the fluid carrier material containing the grinding particles flows.
  • “on the side facing the flow” means the side over which the fluid carrier material containing the flow particles flows.
  • a component having a rotationally symmetrical projection surface exposed to the flow is, for example, a sphere. Any other component which exhibits a circular face in the flow direction of the fluid carrier material containing the grinding particles also has a rotationally symmetrical projection surface exposed to the flow.
  • Such a component can for example also have the form of a droplet, the component in this case being exposed to the flow at the hemispherical end of the droplet.
  • the inclined and concavely running surface of the additionally applied material has a curvature with a radius in the range of from 1 to 5 times the diameter of the rotationally symmetrical projection surface.
  • the inclined and concavely running surface of the additionally applied material further preferably has a curvature with a radius in the range of from 1.5 to 3 times the diameter of the rotationally symmetrical projection surface, for example a curvature with a radius which corresponds to two times the diameter of the rotationally symmetrical projection surface.
  • the additional material which is attached at positions at which a flow separation occurs on the finished component, on the side facing the flow has a surface which is inclined and runs concavely in the flow direction with respect to a central plane running parallel to the flow direction of the fluid carrier material containing the grinding particles. Also in this case, the surface which is inclined and concave with respect to the central plane running parallel to the flow direction of the fluid carrier material containing the grinding particles prevents a flow separation from occurring, which leads to cavitation and thus uncontrolled removal of material.
  • the surface of the additional material that is inclined and runs concavely with respect to the central plane running parallel to the flow direction of the fluid carrier material containing the grinding particles has a curvature with a radius in the range of from 2 to 10 times the maximum perpendicular spacing from the central plane running parallel to the flow direction of the fluid carrier material containing the grinding particles to the edge of the non-rotationally symmetrical projection surface.
  • the curvature of the inclined and concavely running surface has a radius in the range of from 3 to 6 times the maximum perpendicular spacing from the central plane running parallel to the flow direction of the fluid carrier material containing the grinding particles to the edge of the non-rotationally symmetrical projection surface, for example a radius which corresponds to four times the maximum perpendicular spacing from the central plane running parallel to the flow direction of the fluid carrier material containing the grinding particles to the edge of the non-rotationally symmetrical projection surface.
  • central means that the intersecting line of the plane running parallel to the flow direction of the fluid carrier material containing the grinding particles and having the non-rotationally symmetrical projection surface runs in the center of the projection surface.
  • the intersecting line of the plane running parallel to the flow direction of the fluid carrier material containing the grinding particles and having the non-rotationally symmetrical projection surface forms the axis of symmetry of the non-rotationally symmetrical projection surface.
  • Components having a non-rotationally symmetrical projection surface are, for example, tubes, shafts or spindles, the external surface of which is to be processed by the flow grinding method.
  • the tubes, shafts or spindles can have any desired cross-sectional form here, a round cross section being particularly suitable for processing by the flow grinding method.
  • the tube to be processed, the shaft to be processed or the spindle to be processed is placed, in this case transversely to the flow direction of the fluid carrier material containing the grinding particles, is placed into the duct through which the fluid carrier material containing the grinding particles is conducted, with the result that the projection surface of the tube, the shaft or the spindle that is exposed to the flow is a rectangle, the length of which corresponds to the length of the tube, the shaft or the spindle and the height of which corresponds to the diameter of the tube, the shaft or the spindle.
  • the central plane running parallel to the flow direction of the fluid carrier material containing the grinding particles extends preferably parallel to the length of the rectangle and intersects the projection surface at half the height.
  • the radius of the curvature of the inclined and concave surface thus corresponds to 2 to 10 times the radius of the tube, the shaft or the spindle.
  • the additionally applied material has to be removed in order to obtain the desired component.
  • material which has in the center a convexly running surface and outwardly a concavely running surface is preferably applied to the wall of the duct which is exposed to the flow of the fluid carrier material containing the grinding particles on account of the change in direction of the duct.
  • the additionally applied material on the side which is exposed to the flow of the fluid carrier material containing the grinding particles prevents the situation in which a depression is introduced into the wall of the duct by the flow grinding.
  • the surface which runs convexly in the center and runs outwardly concavely assists the deflection of the fluid carrier material containing the grinding particles and prevents in particular uncontrolled removal of material by cavitation.
  • the material applied to the wall is thus removed in a controlled manner by the flow grinding process, with the result that it is possible to prevent damage to the wall of the duct in a simple manner.
  • the convexly running surface has a curvature with a radius in the range of from 0.5 to 5 times the hydraulic diameter of the duct.
  • the curvature particularly preferably has a radius in the range of from 0.5 to 2 times the hydraulic diameter of the duct, for example one times the hydraulic diameter of the duct.
  • the maximum thickness of the applied material corresponds preferably to 0.1 to 0.75 times the hydraulic diameter of the duct, in particular 0.4 to 0.6 times, for example 0.5 times.
  • the outwardly concavely running surface of the applied material preferably has a curvature with a radius in the range of from 0.5 to 5 times the hydraulic diameter of the duct.
  • the outwardly concavely running surface particularly preferably has a curvature with a radius in the range of from 1 to 3 times, for example two times, the hydraulic diameter of the duct.
  • the hydraulic diameter on which the radius of the concave curvature of the applied material and the radius of the convex curvature of the applied material are based is the hydraulic diameter of the duct downstream of the change in direction.
  • the duct has a widening in which the duct increases in size from a region with a first hydraulic diameter to a region with a second hydraulic diameter, that is to say that the second hydraulic diameter is greater than the first hydraulic diameter, in which a transition portion of the wall of the duct between the region with the first hydraulic diameter and the region with the second hydraulic diameter has an angle of between 7° and 90°, in particular between 45° and 90°, with respect to the main flow direction, it is possible for cavitation and thus an uncontrolled removal of material to occur both at the transition portion and in the region with the second hydraulic diameter when flow passes through the duct in the direction from the region with the first hydraulic diameter to the region with the second hydraulic diameter.
  • cavitation with associated uncontrolled removal of material can correspondingly occur in the transition region and the region which then adjoins it in the flow direction and has the first hydraulic diameter.
  • the duct has a widening in which the duct increases in size from a region with a first hydraulic diameter to a region with a second hydraulic diameter, in which a transition portion of the wall of the duct between the region with the first hydraulic diameter and the region with the second hydraulic diameter has an angle of between 7° and 90°, in particular between 45° and 90°, with respect to the main flow direction, in which the surface over which flow passes runs convexly at the transition from the region with the first hydraulic diameter to the transition portion and runs concavely at the transition from the transition portion to the region with the second hydraulic diameter.
  • the transition from the transition portion to the region with the second hydraulic diameter can however also have an angle.
  • the first hydraulic diameter to the transition portion is prevented or at least greatly reduced, with the result that an uncontrolled removal of material on account of the associated cavitation can be prevented or restricted.
  • the surface running convexly at the transition from the region with the first hydraulic diameter to the transition portion preferably has a curvature with a radius in the range of from 0.05 to 2.5 times the hydraulic diameter of the duct upstream of the widening.
  • the surface running convexly at the transition from the region with the first hydraulic diameter to the transition portion preferably has a curvature with a radius in the range of from 0.25 to 1 times, for example 0.375 times, the hydraulic diameter of the duct upstream of the widening.
  • the surface running concavely at the transition from the transition portion to the region with the second hydraulic diameter preferably has a curvature with a radius in the range of from 0.05 to 2.5 times the hydraulic diameter of the duct upstream of the widening.
  • the curvature of the surface running concavely at the transition from the transition portion to the region with the second hydraulic diameter particularly preferably has a radius in the range of from 0.25 to 1 times, for example 0.375 times, the hydraulic diameter of the duct upstream of the widening.
  • the blank which is processed by the flow grinding process can be produced by a variety of production methods.
  • the blank can be produced by a casting process. It is also possible to produce the blank by a machining process.
  • the blank is particularly preferably produced by an additive production process, for example 3D printing.
  • FIG. 1 shows a blank with a circular cross section and material attached thereto, in order to prevent a flow separation
  • FIG. 2 shows a duct through which flow passes, the walls of which duct are processed by flow grinding and which duct comprises a change in direction
  • FIG. 3 shows a duct through which flow passes and which has a widening.
  • FIG. 1 shows a blank with a circular cross section and material attached thereto, in order to prevent a flow separation.
  • additional material 5 is attached to the blank 1 on the side facing away from the flow.
  • the additional material 5 has on the side 7 facing the flow a surface 11 which is inclined and runs concavely in the flow direction with respect to a central plane 9 , which runs parallel to the flow direction 25 of the fluid carrier material containing the grinding particles.
  • the blank 1 illustrated in FIG. 1 has a circular cross section, such as for example a cylinder or a sphere.
  • the blank 1 When the blank 1 is a cylinder, it has a non-rotationally symmetrical projection surface exposed to the flow, specifically a rectangular projection surface.
  • the central plane 9 which runs parallel to the flow direction 25 of the fluid carrier material containing the grinding particles, forms with the rectangular projection surface an intersecting line which runs in the center of the projection surface, with the result that the spacing from the intersecting line to the edge of the projection surface corresponds to the radius of the cylinder.
  • the blank When the blank is not a cylinder but rather is a sphere, it has a rotationally symmetrical projection surface, in this case the additional material on the side facing the flow having a surface which runs concavely and in an inclined manner in the flow direction 25 with respect to a central axis.
  • the central axis runs in this case in a manner corresponding to the central plane 9 through the center point of the sphere and parallel to the flow direction 25 of the fluid carrier material containing the grinding particles.
  • the surface 11 which is inclined and runs concavely with respect to the central plane 9 preferably has a curvature with a radius 13 which corresponds to 2 to 10 times the maximum perpendicular spacing from the central plane 9 to the edge of the non-rotationally symmetrical projection surface, that is to say it corresponds to 2 to 10 times the radius 15 of the cylindrical blank 1 .
  • the radius 13 of the curvature of the surface 11 which runs concavely and in an inclined manner particularly preferably amounts to 3 to 6 times the maximum perpendicular spacing from the central plane 9 to the edge of the non-rotationally symmetrical projection surface and/or the radius 15 of the rotationally symmetrical projection surface, for example, as illustrated in FIG. 1 , 4 times the radius 15 of the rotationally symmetrical projection surface or the cylinder and/or two times the radius 15 of the rotationally symmetrical projection surface or the cylinder.
  • the surface running concavely and in an inclined manner of the additionally applied material is preferably inclined such that the central plane 9 , in the case of a blank 1 with a non-rotationally symmetrical projection surface in the flow direction 25 , or the central axis, in the case of a blank 1 with a rotationally symmetrical projection surface in the flow direction, is a tangent of the inclined and concavely running surface 11 .
  • the additional material 5 is also attached symmetrically with respect to the central plane 9 , with the result that the additional material 5 on both sides of the central plane 9 has an inclined and concavely running surface 11 which ends tangentially with respect to the central plane 9 .
  • the additional material 5 is preferably likewise rotationally symmetrically attached to the blank 1 .
  • the additional material is preferably applied such that the radius of the curvature on both sides of the central plane 9 is different, such that the central plane 9 on both sides and at the same position in the flow direction of the fluid carrier material containing the grinding particles forms a tangent to the surface running in a curved and inclined manner.
  • FIG. 2 shows a duct through which flow passes, the walls of which duct are processed by flow grinding and which duct comprises a change in direction.
  • the duct 17 illustrated in FIG. 2 has a first portion with a first hydraulic diameter 19 and a second portion with a second hydraulic diameter 21 .
  • the second portion adjoins the first portion downstream of a change in direction.
  • Additional material 5 which has in the center a convexly running surface 27 and outwardly a concavely running surface 29 , is applied to the wall 23 of the duct 17 which is exposed to the flow of the fluid carrier material containing the grinding particles, the flow direction of which is labeled by an arrow 25 , on account of the change in direction of the duct.
  • the convexly running surface 27 preferably has a curvature with a radius 31 which is in the range of from 0.5 to 5 times the hydraulic diameter.
  • the radius 31 of the curvature of the convexly running surface 27 particularly preferably amounts to 0.5 to 2 times the hydraulic diameter of the duct 17 .
  • the duct 17 has a first hydraulic diameter 19 upstream of the change in direction and a second hydraulic diameter 21 downstream of the change in direction, the hydraulic diameter on which the size of the radius 31 is based is the second hydraulic diameter 21 .
  • the radius 31 of the curvature of the convexly running surface particularly preferably amounts to one times the second hydraulic diameter 21 , as illustrated here.
  • the concavely running surface 29 preferably has a curvature with a radius 33 which is in the range of from 0.5 to 5 times the hydraulic diameter of the duct 17 .
  • the radius 33 particularly preferably amounts to 1 to 3 times the hydraulic diameter of the duct 17 .
  • the hydraulic diameter on which the radius 33 of the curvature of the concavely running surface 29 is based is the second hydraulic diameter 21 .
  • the radius 33 of the curvature of the convexly running surface 27 in particular amounts to two times the second hydraulic diameter 21 , as illustrated here.
  • the thickness of the applied additional material 5 has a maximum thickness, which corresponds to 0.2 to 0.75 times the hydraulic diameter of the duct 17 .
  • the thickness of the applied additional material 5 particularly preferably corresponds to 0.5 times the hydraulic diameter of the duct 17 , the hydraulic diameter on which the thickness of the applied additional material 5 is based also being the second hydraulic diameter here.
  • the wall 37 is rounded on the side which is opposite the wall which is exposed to the flow of the fluid carrier material containing the grinding particles on account of the change in direction of the duct and at which a flow separation can result on account of the change in direction of the duct 17 .
  • the radius 39 with which the wall 37 is rounded preferably corresponds to 0.1 to 2.5 times the hydraulic diameter of the duct 17 , in which the hydraulic diameter of the duct 17 in the case of a duct with a first hydraulic diameter 19 upstream of the change in direction and a second hydraulic diameter 21 downstream of the change in direction the average hydraulic diameter is used.
  • the arithmetic mean value is used, that is to say the average hydraulic diameter is calculated from the sum of the first hydraulic diameter 19 and the second hydraulic diameter 21 divided by 2.
  • the radius 39 particularly preferably corresponds to 0.25 to one times the average hydraulic diameter and in particular 0.5 times the average hydraulic diameter.
  • FIG. 3 shows a duct through which flow passes and which has a widening.
  • a duct 41 through which flow passes and which has a widening 43 has a first region 45 with a first hydraulic diameter 47 and a second region 49 with a second hydraulic diameter 51 .
  • the second hydraulic diameter 51 is greater than the first hydraulic diameter 47 .
  • the duct 41 through which flow passes has a transition portion 53 , in which the wall of the duct 41 has an angle of between 45° and 90° with respect to the flow direction 25 .
  • the wall of the duct 41 transition portion has an angle of 90° with respect to the flow direction 25 .
  • the surface 55 which runs convexly at the transition from the first region 45 to the transition portion 53 , preferably has a curvature with a radius 57 in the range of from 0.05 to 2.5 times the hydraulic diameter of the duct upstream of the widening 43 , that is to say of the first hydraulic diameter 47 in the first region 45 .
  • the surface 55 which runs convexly at the transition from the first region 45 to the transition portion 53 , particularly preferably has a curvature with a radius 57 which corresponds to 0.25 to 1 times the first hydraulic diameter, for example, as illustrated here, 0.375 times the first hydraulic diameter 47 in the first region 45 .
  • the transition from the transition portion 53 to the second region 49 can have an angle, for example a right angle in the case of a wall of the transition portion 53 which has an angle of 90° with respect to the flow direction 25 , or else, as illustrated here, can run concavely.
  • said surface in the transition from the transition portion 53 to the second region 49 runs concavely, said surface preferably has a curvature with a radius 59 , which corresponds to 0.05 to 2.5 times the first hydraulic diameter 47 in the first region 45 , that is to say the hydraulic diameter upstream of the widening 43 .
  • the curvature at the transition from the transition portion 53 particularly preferably has a radius 59 which corresponds to 0.25 to 1 times the first hydraulic diameter 47 , for example, as illustrated here, 0.375 times the first hydraulic diameter, that is to say the hydraulic diameter upstream of the widening 43 in the first region 45 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US17/279,451 2018-09-24 2019-09-18 Method for surface processing of a component by flow grinding Abandoned US20220032425A1 (en)

Applications Claiming Priority (3)

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EP18196196 2018-09-24
EP18196196.2 2018-09-24
PCT/EP2019/074929 WO2020064444A1 (de) 2018-09-24 2019-09-18 Verfahren zur oberflächenbearbeitung eines bauteils durch strömungsschleifen

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EP (1) EP3856459A1 (de)
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DE102022130391A1 (de) 2022-11-17 2024-05-23 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Oberflächenbearbeitung eines additiv hergestellten Bauteils, Vorrichtung zur Oberflächenbearbeitung wenigstens eines additiv hergestellten Bauteils sowie Fahrzeug

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JP2022502275A (ja) 2022-01-11
CN112752632A (zh) 2021-05-04
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CN112752632B (zh) 2023-10-27

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