EP3856459A1 - Procédé de traitement de surface d'une pièce par rectification par écoulement - Google Patents

Procédé de traitement de surface d'une pièce par rectification par écoulement

Info

Publication number
EP3856459A1
EP3856459A1 EP19779389.6A EP19779389A EP3856459A1 EP 3856459 A1 EP3856459 A1 EP 3856459A1 EP 19779389 A EP19779389 A EP 19779389A EP 3856459 A1 EP3856459 A1 EP 3856459A1
Authority
EP
European Patent Office
Prior art keywords
channel
hydraulic diameter
flow
carrier material
abrasive particles
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.)
Pending
Application number
EP19779389.6A
Other languages
German (de)
English (en)
Inventor
Mathias WEICKERT
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.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of EP3856459A1 publication Critical patent/EP3856459A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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 is based on a method for surface processing a component by flow grinding, comprising the following steps:
  • Flow grinding processes are processing processes in which a surface to be processed is flowed over by a flowable carrier material containing grinding particles, in particular a liquid containing grinding particles.
  • the abrasive particles contained in the flowable carrier material meet the surface of the component to be machined during the overflow, whereby the corresponding surface is erosively abraded by the abrasive particles removing material from the component upon impact.
  • the flowable carrier material is a liquid
  • the flow grinding process is also called hydroerosive process or hydroerosive grinding process.
  • Flow grinding processes can be used, for example, to treat the surfaces of 3D-printed components made of metal, ceramic and / or plastic, which have a surface roughness between 50 and 500 pm. These surface roughness effects undesirable effects when using the corresponding components, for example fouling or increased pressure loss.
  • the geometry of the component may have to be modified during the manufacturing process, in particular during the production, using a 3D printing process, and the grinding process must be able to be set precisely and in a controlled manner.
  • a disadvantage of the known methods is that a flow separation can occur in the case of surfaces that are not planar to be machined, which leads to cavitation and thus undesirable material removal and can therefore lead to damage to the surface to be machined and a mathematical simulation of the grinding is complex.
  • the object of the present invention is therefore to provide a method in which the surfaces of the component to be machined are not damaged and which is less complex than the mathematical simulations.
  • the task is solved by a method for the surface treatment of a component by flow grinding, comprising the following steps:
  • the flowable carrier material which contains the abrasive particles is, for example, water, oil or a highly viscous fat, that is to say a fat with a viscosity of Processing temperature in the range of 100 to 1,000,000 Pa * s, in particular with a viscosity in the range of 1,000 to 200,000 Pa * s.
  • the flowable carrier material is particularly preferably oil, in particular a hydraulic oil.
  • the proportion of the abrasive particles in the flowable carrier material is preferably in the range from 1 to 80% by volume, in particular in the range from 2 to 60% by volume.
  • the proportion of the abrasive particles is preferably in the range from 1 to 50% by volume, more preferably in the range from 1 to 20% by volume and in particular in the range of 1 up to 5 vol .-% and when using a highly viscous fat as flowable carrier material, the proportion of abrasive particles is preferably in the range from 20 to 80 vol .-% and in particular in the range from 40 to 60 vol .-%.
  • the material used for the abrasive particles depends on the material of the component to be machined. If the component is made of a metal or a ceramic, abrasive particles made of boron carbide or diamond are preferably used. In the case of a component made of a plastic, grinding particles made of boron carbide, diamond, sand or silicon are particularly suitable.
  • the shape and size of the abrasive particles also depend on the material to be processed, the material of the component and the desired surface finish, in particular the desired surface roughness and the size of the structure to be processed. Suitable particle shapes for the abrasive particles are in particular sharp-edged particles, for example broken particles. Suitable abrasive particles preferably have a size distribution of 1 to 1000 pm and in particular a size distribution of 1 to 10 pm when using oil and 10 pm to 1000 pm when using fat.
  • the component For processing by flow grinding, the component is first introduced into a channel through which the flowable carrier material containing the grinding particles flows. If outer surfaces of the component are to be machined, the component is introduced into the channel in such a way that the flowable carrier material containing the abrasive particles can flow over the surfaces. When machining inner surfaces, for example bores, the component is connected to the channel in such a way that the flowable carrier material containing the abrasive particles flows through the openings to be machined, for example bores, but does not come into contact with surfaces that are not machined should be. For the grinding of bores, for example, suitable connections can be provided on the component, via which the flowable carrier material containing the grinding particles is supplied and flows out of the component again.
  • the raw material is at the positions at which the flow direction of the abrasive particles changes when overflowing containing flowable carrier material changes rounded with a radius that corresponds to 0.1 to 2.5 times the average distance between the flowed surface and the opposite wall of the channel flowed through by the flowable carrier material containing the abrasive particles.
  • the Roh ling is preferred at the positions where the flow direction of the flow when flowing Flowable carrier material containing abrasive particles changes, rounded off with a radius that is 0.25 to 1.5 times, and in particular 0.5 times, the mean distance between the flowed-over surface and the opposite wall of the flowed through by the flowable carrier material containing the abrasive particles Channel corresponds.
  • the mean distance can be determined numerically, for example.
  • the mean distance is preferably the mean of the minimum distance between the overflowing surface and the opposite wall and the maximum distance between the overflowing surface and the opposite wall.
  • the minimum distance and the maximum distance can be both both before the change in the flow direction or both after the change in the flow direction, or one of the two distances is before the change in the flow direction and the other of the two distances is behind the flow direction.
  • the channel in particular in the case of a flow through a channel which has a change in direction, it is possible, for example, for the channel to have a first hydraulic diameter before the change in direction and a second hydraulic diameter after the change in direction.
  • the first hydraulic diameter can be smaller than the second hydraulic diameter or the first hydraulic diameter is larger than the second hydraulic diameter.
  • the hydraulic diameter is calculated as follows: where D h is the hydraulic diameter, U the circumference and A the cross-sectional area of the flowed channel.
  • a change in the flow direction of the flowable carrier material containing the abrasive particles results, for example, when a channel into which the blank is introduced and through which the flowable carrier material containing the abrasive particles flows through in order to process the outer surfaces of the blank, has a curvature or kink and the blank to be machined is positioned in the area of the curvature or kink. Furthermore, there is a change in the direction of flow even if the blank contains a channel and this channel has a curvature or a bend and the walls delimiting the channel are to be processed by the flow loop. In this case, the flowable carrier material containing the abrasive particles flows through the channel in the blank.
  • the blank When external surfaces of the blank are to be machined by the flow grinding process, the blank is usually positioned in a straight channel without kinking or curvature and without constriction or expansion. In order to prevent material from being removed in an uncontrolled manner due to stall due to cavitation, additional material is attached to positions where a stall occurs on the finished component.
  • the rotationally symmetrical projection surface against which the flow flows has an inclined and concave surface on the side facing the flow in the direction of flow to a central axis of the channel in which the flowable carrier material containing the abrasive particles flows.
  • “on the side facing the flow” means the side over which the flowable carrier material containing the abrasive particles flows.
  • a component with a flow onto a rotationally symmetrical projection surface is, for example, a ball. Every other component, which shows a circular view in the flow direction of the flowable carrier material containing the grinding particles, has a flowed-on, rotationally symmetrical projection surface.
  • a component can, for example, also have a teardrop shape, in which case the component flows against the hemispherical end of the drop.
  • the inclined and concave surface of the additionally applied material has a curvature with a radius in the range of 1 to 5 times the diameter of the rotationally symmetrical projection surface. More preferably, the inclined and concave surface of the additionally applied material has a curvature with a radius in the range of 1.5 to 3 times the diameter of the rotationally symmetrical projection surface, for example a curvature with a radius that is twice the diameter of the rotationally symmetrical projection surface corresponds.
  • the additional material which is attached at positions where the finished component is stalled, has a flow direction on the side facing the flow in a direction of flow to a central one parallel to the direction of flow of the abrasive particles flowable carrier material on the inclined and concave surface.
  • the inclined and concave surface to the central plane running parallel to the direction of flow of the flowable carrier material containing the abrasive particles prevents a flow stall which leads to cavitation and thus uncontrolled material removal.
  • the surface of the additional material which is inclined and concave to the central plane parallel to the flow direction of the flowable carrier material containing the abrasive particles has a curvature with a radius in the range from 2 to 10 times the maximum vertical distance from the central , parallel to the direction of flow of the flowable carrier material containing the abrasive particles plane to the edge of the non-rotationally symmetrical projection surface.
  • the curvature of the inclined and concavely running surface particularly preferably has a radius in the range of 3 to 6 times the maximum vertical distance from the central plane running parallel to the direction of flow of the flowable carrier material containing the abrasive particles to the edge of the non-flow rotationally symmetrical projection surface, for example a radius which corresponds to four times the maximum vertical distance from the central plane running parallel to the flow direction of the flowable carrier material containing the abrasive particles to the edge of the non-rotationally symmetrical projection surface.
  • central means that the line of intersection of the flowable carrier material running parallel to the direction of flow of the flowable abrasive particles contains the plane with the non-rotationally symmetrical projection surface in the middle of the projection surface.
  • the line of intersection of the plane running parallel to the flow direction of the flowable carrier material containing the grinding particles and the non-rotationally symmetrical projection surface forms the axis of symmetry of the non-rotationally symmetrical projection surface.
  • Components with a projection surface that is not rotationally symmetrical are, for example, tubes, shafts or axes, the outer surface of which is to be processed by the flow grinding method.
  • the tubes, shafts or axes can have any cross-sectional shape, a round cross-section being particularly suitable for processing by the flow grinding method.
  • the tube to be machined, the shaft to be machined or the axis to be machined is placed transversely to the direction of flow of the flowable carrier material containing the abrasive particles into the channel through which the flowable carrier material containing the abrasive particles is passed, so that the flow onto the projection surface of the tube the shaft or the axis is a rectangle, the length of which corresponds to the length of the tube, the shaft or the axis and the height of which corresponds to the diameter of the tube, the shaft or the axis.
  • the central plane running parallel to the flow direction of the flowable carrier material containing the abrasive particles preferably extends parallel to the length of the rectangle and intersects the projection surface at half height. In this case the radius of curvature of the inclined and concave surface is 2 to 10 times the radius of the tube, the shaft or the axis.
  • the additional material applied After machining the surface by flow grinding, the additional material applied must be removed in order to obtain the desired component.
  • a flow-over surface that forms a wall of the channel is flowed from the flowable carrier material containing the abrasive particles, material applied which has a convex surface in the middle and a concave surface outwards.
  • the additionally applied material on the side flowed against by the flowable carrier material containing the abrasive particles prevents a depression from being made in the wall of the channel by the flow grinding.
  • the surface which is convex in the middle and concave towards the outside, supports the deflection of the flowable carrier material containing the abrasive particles and in particular prevents uncontrolled material removal through cavitation.
  • the material applied to the wall is removed in a controlled manner by the flow grinding method, so that damage to the wall of the channel can be prevented in a simple manner.
  • the convex surface preferably has a curvature with a radius in the range from 0.5 to 5 times the hydraulic diameter of the channel.
  • the curvature has a radius in the range of 0.5 to 2 times the hydraulic diameter of the channel, for example the simplicity of the hydraulic diameter of the channel.
  • the maximum thickness of the applied material preferably corresponds to 0.1 to 0.75 times the hydraulic diameter of the channel, in particular 0.4 to 0.6 times, for example 0.5 times.
  • the outwardly concave surface of the applied material preferably has a curvature with a radius in the range of 0.5 to 5 times the hydraulic diameter of the channel.
  • the outwardly concave surface particularly preferably has a curvature with a radius in the range from 1 to 3 times, for example twice, the hydraulic diameter of the channel.
  • the hydraulic diameter to which the radius of the concave curvature of the applied material and the radius of the convex curvature of the applied material refer is the hydraulic diameter of the channel the change of direction.
  • the channel has an extension in which the channel increases from an area with a first hydraulic diameter to an area with a second hydraulic diameter, that is to say that the second hydraulic diameter is larger than the first hydraulic diameter, with a transition section the wall of the channel between the area with the first hydraulic diameter and the area with the second hydraulic diameter has an angle between 7 ° and 90 °, in particular between 45 ° and 90 ° to the main flow direction, both at the transition section and in the area with the second hydraulic diameter cavitation and thus an uncontrolled material removal occur when the channel is flowed through in the direction from the area with the first hydraulic diameter to the area with the second hydraulic diameter.
  • the channel has an extension in which the channel extends from an area with a first hydraulic diameter to an area with a second hydraulic diameter is increased, with a transition section of the wall of the channel between the area with the first hydraulic diameter and the area with the second hydraulic diameter, an angle between 7 ° and 90 °, in particular between 45 ° and 90 ° to the main flow direction, the flowed surface at the transition from the area with the first hydraulic diameter to the transition section is convex and concave at the transition from the transition section to the area with the second hydraulic diameter.
  • the transition from the transition section to the area with the second hydraulic diameter can also have an angle.
  • the surface which is convex during the transition from the area with the first hydraulic diameter to the transition section has a curvature with a radius in the range from 0.05 to 2.5 times the hydraulic diameter of the channel before the expansion.
  • the surface which is convex during the transition from the area with the first hydraulic diameter to the transition section has a curvature with a radius in the range from 0.25 to 1 times, for example 0.375 times, the hydraulic diameter of the channel before the expansion.
  • the surface which is concave during the transition from the transition section to the area with the second hydraulic diameter preferably has a curvature with a radius in the range from 0.05 to 2.5 times the hydraulic diameter of the channel before the expansion.
  • the curvature of the surface running concavely at the transition from the transition section to the region with the second hydraulic diameter ver has a radius in the range from 0.25 to 1 times, for example 0.375 times, the hydraulic diameter of the channel before the expansion.
  • the blank which is processed by the flow grinding process, can be manufactured by various manufacturing processes.
  • 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 manufacturing process, for example 3D printing.
  • FIG. 1 shows a blank with a circular cross section and material attached to it in order to prevent a stall
  • FIG. 2 shows a flow-through channel, the walls of which are processed by flow loops and which has a change in direction
  • Figure 3 shows a flow channel with expansion
  • Figure 1 shows a blank with a circular cross section and attached Mate rial to prevent stall.
  • a blank 1 with a surface 3, which is to be processed by flow grinding is introduced into a suitable channel through which the flowable carrier material containing a grinding particle flows.
  • 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 concave in the flow direction to a central plane 9 which runs parallel to the flow direction 25 of the flowable carrier material containing the abrasive particles.
  • the blank 1 shown in Figure 1 has a circular cross section such as a cylinder or a ball. If the blank 1 is a cylinder, it has a non-rotationally symmetrical projection surface, namely a rectangular projection surface.
  • the blank is not a cylinder but a sphere, it has a rotationally symmetrical projection surface, in which case the additional material on the flow-facing side has a surface that is inclined in the direction of flow 25 to a central axis and has a concave surface.
  • the central axis runs according to the central plane 9 through the center of the ball parallel to the flow direction 25 of the flowable carrier material containing the abrasive particles.
  • the surface 11 which is inclined to the central plane 9 and runs in a concave manner preferably has a curvature with a radius 13 which corresponds to 2 to 10 times the maximum vertical distance from the central plane 9 to the edge of the non-rotationally symmetrical projection surface , that is, which corresponds to 2 to 10 times the radius 15 of the cylindrical blank 1.
  • the inclined to the central axis and concave surface in a kugelförmi gene blank 1 has a curvature with a radius 13 which is 1 to 5 times the diameter of the spherical blank 1, that is 2 to 10 times the radius of the spherical blank 1, corresponds.
  • the radius 13 of the curvature of the inclined and concave surface 11 is particularly preferably 3 to 6 times the maximum vertical distance from the central plane 9 to the edge of the non-rotationally symmetrical projection surface or the radius 15 of the rotationally symmetrical projection surface, for example, as in FIG 1 shown, 4 times the radius 15 of the rotationally symmetrical projection surface or the cylinder or twice the radius 15 of the rotationally symmetrical projection surface or the cylinder.
  • the inclined and concave surface of the additionally applied material is inclined such that the central plane 9 in a blank 1 with a non-rotationally symmetrical projection surface in the flow direction 25 or the central axis in a blank 1 with a rotationally symmetrical projection surface in the flow direction is a tan of the inclined and concave surface 11.
  • the additional material 5 is also attached symmetrically to the central plane 9, so that the additional material 5 on both sides of the central plane 9 has an inclined and concave surface 11 has, which ends tangential 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 curvature is different on both sides of the central plane 9, so that the central plane 9 on both sides at the same position in the flow direction of the flowable carrier material containing the abrasive particles form a tangent to the inclined and curved surface.
  • Figure 2 shows a flow-through channel, the walls of which are processed by flow loops and which has a change in direction
  • the channel 17 shown in FIG. 2 has a first section with a first hydraulic diameter 19 and a second section with a second hydraulic diameter 21.
  • the second section follows the first section after a change of direction.
  • the convex surface 27 preferably has a curvature with a radius 31, which is in the range of 0.5 to 5 times the hydraulic diameter.
  • the radius 31 of the curvature of the convex surface 27 is particularly preferably 0.5 to 2 times the hydraulic diameter of the channel 17. If the channel 17, as shown here, has a first hydraulic diameter 19 before the change of direction and after the change of direction a second hydraulic diameter 21, the hydraulic diameter to which the size of the radius 31 relates is the second hydraulic diameter 21.
  • the radius 31 of the curvature of the convex surface is the simple one of the second hydraulic diameter 21, as shown here .
  • the concave surface 29 preferably has a curvature with a radius 33 in the range of 0.5 to 5 times the hydraulic diameter of the channel 17.
  • the radius 33 is particularly preferably 1 to 3 times the hydraulic diameter of the channel 17.
  • the hydraulic diameter is the radius 33 of the curvature of the concave surface 29 relates, the second hydraulic diameter 21.
  • the radius 33 of the curvature of the convex surface 27 is twice the 2nd hydraulic diameter 21, as shown here.
  • the thickness of the additional material 5 applied has a maximum thickness which corresponds to 0.2 to 0.75 times the hydraulic diameter of the channel 17.
  • the thickness of the applied additional material 5 particularly preferably corresponds to the 0.5 times the hydraulic diameter of the channel 17, the hydraulic diameter, to which the thickness of the applied additional material 5 relates, being the second hydraulic diameter 21.
  • the radius 39, with which the wall 37 is rounded preferably corresponds to 0.1 to 2.5 times the hydraulic diameter of the channel 17, the hydraulic diameter of the channel 17 for a channel with a first hydraulic diameter 19 before Change of direction and a second hydraulic diameter's 21 after the change of direction, the average hydraulic diameter is used.
  • the arithmetic mean value is used here, that is to say the mean 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 a simple one of the mean hydraulic diameter and in particular 0.5 times the average hydraulic diameter.
  • Figure 3 shows a flow channel with an extension.
  • a flow-through channel 41 with an extension 43 has a first area 45 with a first hydraulic diameter 47 and a second area 49 with a second hydraulic diameter 51.
  • the second hydraulic diameter 51 is larger than the first hydraulic diameter 47.
  • the channel 41 through which flow flows has a transition section 53, in which the wall of the channel 41 has an angle between 45 ° and 90 ° to the flow direction 25 having.
  • the wall of the channel 41 transition section has a 90 ° angle to the flow direction 25.
  • the flowed-over surface of the channel 41 at the transition from the first region 45 to the transition section 53 is convex.
  • the surface 55 which is convex during the transition from the first region 45 to the transition section 53 preferably has a curvature with a radius 57 in the range from 0.05 to 2.5 times the hydraulic diameter of the channel before the enlargement 43, that is to say the first hydraulic diameter 47 in the first region 45.
  • the surface 55 which is convex during the transition from the first region 45 to the transition section 53 has a curvature with a radius 57 which is 0.25 to 1 times the first hydraulic diameter, for example, as here shown, which corresponds to 0.375 times the first hydraulic diameter 47 in the first region 45.
  • the transition from the transition section 53 to the second region 49 can have an angle, for example in the case of a wall of the transition section 53 which has an angle of 90 ° to the flow direction 25, a right angle, or as shown here, is concave.
  • the surface in the transition from the transition section 53 to the second region 49 is concave, it preferably has a curvature with a radius 59 which is 0.05 to 2.5 times the first hydraulic diameter 47 in the first region 45, that is to say that hydraulic diameter before the extension 43 corresponds.
  • the curvature at the transition from the transition section 53 has a radius 59 which corresponds to 0.25 to 1 times the first hydraulic diameter 47, for example, as shown here, 0.375 times the first hydraulic diameter, that is to say the hydraulic diameter before the extension 43 in the first area 45.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

L'invention concerne un procédé de traitement de surface d'une pièce par rectification par écoulement, comprenant les étapes suivantes : (a) la fourniture d'une ébauche (1), (b) le déversement d'un matériau de support coulant contenant des particules abrasives sur au moins une surface de l'ébauche (1), l'ébauche (1) étant arrondie dans des positions dans lesquelles, lors du déversement, la direction d'écoulement (25) du matériau de support coulant contenant les particules abrasives varie et, dans des positions dans lesquelles une interruption d'écoulement s'effectue, un matériau (5) supplémentaire est appliqué sur la pièce entièrement usinée, de sorte qu'au début du déversement, une interruption de l'écoulement est empêchée.
EP19779389.6A 2018-09-24 2019-09-18 Procédé de traitement de surface d'une pièce par rectification par écoulement Pending EP3856459A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18196196 2018-09-24
PCT/EP2019/074929 WO2020064444A1 (fr) 2018-09-24 2019-09-18 Procédé de traitement de surface d'une pièce par rectification par écoulement

Publications (1)

Publication Number Publication Date
EP3856459A1 true EP3856459A1 (fr) 2021-08-04

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EP19779389.6A Pending EP3856459A1 (fr) 2018-09-24 2019-09-18 Procédé de traitement de surface d'une pièce par rectification par écoulement

Country Status (5)

Country Link
US (1) US20220032425A1 (fr)
EP (1) EP3856459A1 (fr)
JP (1) JP2022502275A (fr)
CN (1) CN112752632B (fr)
WO (1) WO2020064444A1 (fr)

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WO2020064444A1 (fr) 2020-04-02
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US20220032425A1 (en) 2022-02-03
JP2022502275A (ja) 2022-01-11

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