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WO2020142038A1 - Flow peening process - Google Patents

Flow peening process Download PDF

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Publication number
WO2020142038A1
WO2020142038A1 PCT/TR2019/051183 TR2019051183W WO2020142038A1 WO 2020142038 A1 WO2020142038 A1 WO 2020142038A1 TR 2019051183 W TR2019051183 W TR 2019051183W WO 2020142038 A1 WO2020142038 A1 WO 2020142038A1
Authority
WO
WIPO (PCT)
Prior art keywords
paste
spherical particles
particles
flow
workpiece
Prior art date
Application number
PCT/TR2019/051183
Other languages
French (fr)
Inventor
Kürşad Göv
Original Assignee
Gazi̇antep Üni̇versi̇tesi̇ Rektörlüğü
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 Gazi̇antep Üni̇versi̇tesi̇ Rektörlüğü filed Critical Gazi̇antep Üni̇versi̇tesi̇ Rektörlüğü
Publication of WO2020142038A1 publication Critical patent/WO2020142038A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • 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
    • B24B31/10—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 involving other means for tumbling of work
    • B24B31/116—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 involving other means for tumbling of work using plastically deformable grinding compound, moved relatively to the workpiece under the influence of pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening

Definitions

  • the invention relates to the flow peening process (GOV process) which increases the strength and lifetime of the material by creating residual stress on the surface of the material after basic manufacturing .
  • GOV process flow peening process
  • some methods are used to increase the mechanical properties of the product by creating residual stress on the surface after machining and chipless manufacturing.
  • An example can be a shot peening process.
  • the material (workpiece) surface is bombarded using steel, ceramic and glass spherical balls.
  • thousands of particles that hit the material with the bombardment process beat the entire material surface and create residual stress along the surface. This stress increases the service life of the material to prevent crack formation.
  • JP2010052123A numbered patent document may be given as an example to the prior art.
  • the present invention subject to the mentioned document is a magnetic polishing method for extremely gentle polishing and easy cleaning of the inner surface of a pipe, comprising a slurry.
  • the fluid paste is sent in the pipe to be polished.
  • Magnetic polishing apparatus is present for movement/agitation of the paste in the pipe.
  • Mentioned paste comprises spherical magnetic particles and abrasive particles.
  • the ratio of the diameter of the abrasive particles to the diameter of the magnetic particles is in the range of 1/4 to 1/1000.
  • the paste retains the particles in a slurry state and does not contain any additives for dispersing the particles.
  • Document KR20100001560A may be given as another example.
  • the present invention discloses chemical and mechanical polishing equipment comprising ball particles in a polyurethane matrix, thereby preventing scratches on the material surface.
  • the developed equipment includes a polishing head, a wafer, a slurry feeding part, and a polishing pad.
  • the polishing head rotates the upper part of the wafer.
  • the plate (platen) is rotated at the bottom of this part corresponding to the polishing head.
  • the paste feed piece provides a slurry to the sheet or piece for rotation to the top of the piece.
  • the ball particles were randomly formed on the polishing pad.
  • the surface area in contact with the part is maintained in a matrix.
  • the present invention relates to a slurry mixture that polishes.
  • said pulp mixture comprises abrasive particles treated with an alkali solution and a dispersion agent and an additive comprising a polyacrylic and nonionic polymer.
  • the polyhedral abrasive particles are formed in spherical form by treatment with an alkali solution.
  • the precipitation of the abrasive particles is prevented and its dispersibility is increased. This results in a high polishing ratio and effective treatment.
  • a controllable process can be applied to different types of surfaces. Contrary to the methods described above, it is aimed to develop the flow peening method to increase the surface strength of the products after basic manufacturing without surface polishing and removing any scale from the surface.
  • the invention relates to a paste mixture (paste set) developed for surface finishing processes and to a method of applying this paste mixture to the workpiece surface by flow forging.
  • the surface strength of the workpiece is increased by the invention.
  • the flow peening method of the present invention is based on the application of a carrier and retention polymeric paste assembly containing spherical particles by flow to a workpiece surface to form homogeneous, residual stresses on said surface.
  • the method developed generally comprises the steps of applying a carrier and holding paste mixture containing spherical particles to a workpiece surface by flowing and forging the surface without removing chips from the surface .
  • One embodiment of the invention is called the GOV process .
  • the paste mixture applied in the developed method is also within the scope of the invention.
  • the mixture comprises a carrier and retention paste containing spherical particles.
  • the diameters of the spherical particles are different from each other. In one embodiment of the invention, the diameters of the spherical particles are in the range of 0.2-5 mm.
  • the spherical particles are balls .
  • the spherical particles comprise steel and / or stainless steel material.
  • the paste is polymeric.
  • the paste is of high viscosity.
  • the paste comprises spherical particles in the range of 10-80%. Preferably, it contains balls in the range of 10-80%.
  • balls of 0.2-5 mm diameter spherical steel and / or stainless steel material are prepared in a very high viscosity paste in a ratio of 10% to 80% of the ball-paste.
  • One embodiment of the invention is applied to all metallic and non- metallic material surfaces according to the diameter of the balls and the viscosity of the polymeric holder and carrier paste.
  • a homogeneous and low surface roughness value is obtained with the polymeric paste tool prepared with balls of different diameters .
  • No machining is applied to the surface in the method of the invention. In other words, no chip is removed from the surface in any scale.
  • Spherical balls are applied to the surface with polymeric paste pressure. The mentioned pressure is obtained by forcing the high viscosity paste from a large diameter to a small diameter. A hard layer is obtained by forming residual stresses on the surface. In this way, the strength values of the workpiece are improved.
  • the particles are applied to the workpiece surface homogeneously and at the desired pressure.
  • One embodiment of the invention increases the strength and working time of the material by creating residual stress on the surface.
  • the balls used are preferably of different diameters. It provides forging of the surface, not removing the chip.
  • the residual stresses are homogeneously formed by uniformly applying the balls to the workpiece surface with carrier and holding paste.
  • the balls are applied to the workpiece surface by flow, not as bombardment. In this way, the surface roughness value of the workpiece is very low.
  • surface collapse formation is prevented and surface quality is improved.
  • the invention provides, in contrast to the forging of the surface by bombardment in a conventional ball forging process, the application of spherical particles by flow to the workpiece surface with a specially prepared carrier and retention polymeric paste to achieve residual stresses on the surface.

Landscapes

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

Abstract

The invention is a surface finishing method for generating homogeneous, residual stresses on the workpiece surface, comprising the steps of applying a carrier and retention polymeric paste tool containing spherical particles to the workpiece surface by flow and forging the surface without removing chips from the surface.

Description

FLOW PEENING PROCESS
The subject of the Invention
The invention relates to the flow peening process (GOV process) which increases the strength and lifetime of the material by creating residual stress on the surface of the material after basic manufacturing .
State of the Art
In the known art, some methods are used to increase the mechanical properties of the product by creating residual stress on the surface after machining and chipless manufacturing. An example can be a shot peening process. In this process, the material (workpiece) surface is bombarded using steel, ceramic and glass spherical balls. During the process, thousands of particles that hit the material with the bombardment process beat the entire material surface and create residual stress along the surface. This stress increases the service life of the material to prevent crack formation.
In the present shot peening process, spherical collapses and inhomogeneous stresses occur on bombarded surfaces. These impacts adversely affect the surface smoothness of the workpiece. The surface obtained according to the carrier and particle properties used may happen to be not homogeneous and controllable. In addition, it is difficult to achieve the desired limits of dimensional tolerances. The distribution of the residual stresses along the surface is expected to be homogeneous, while the process parameters are variable, which prevents the formation of a homogeneous surface.
There are some methods in the art that provide a solution to the problem mentioned.
JP2010052123A numbered patent document may be given as an example to the prior art. The present invention subject to the mentioned document is a magnetic polishing method for extremely gentle polishing and easy cleaning of the inner surface of a pipe, comprising a slurry. The fluid paste is sent in the pipe to be polished. Magnetic polishing apparatus is present for movement/agitation of the paste in the pipe. Mentioned paste comprises spherical magnetic particles and abrasive particles. The ratio of the diameter of the abrasive particles to the diameter of the magnetic particles is in the range of 1/4 to 1/1000. The paste retains the particles in a slurry state and does not contain any additives for dispersing the particles.
Document KR20100001560A may be given as another example. The present invention discloses chemical and mechanical polishing equipment comprising ball particles in a polyurethane matrix, thereby preventing scratches on the material surface. The developed equipment includes a polishing head, a wafer, a slurry feeding part, and a polishing pad. The polishing head rotates the upper part of the wafer. The plate (platen) is rotated at the bottom of this part corresponding to the polishing head. The paste feed piece provides a slurry to the sheet or piece for rotation to the top of the piece. The ball particles were randomly formed on the polishing pad. The surface area in contact with the part is maintained in a matrix.
Document KR20160121227A may also be given as another example. The present invention relates to a slurry mixture that polishes. In one embodiment of the present invention, said pulp mixture comprises abrasive particles treated with an alkali solution and a dispersion agent and an additive comprising a polyacrylic and nonionic polymer. In the dough mixture of the present invention, the polyhedral abrasive particles are formed in spherical form by treatment with an alkali solution. Thus, the precipitation of the abrasive particles is prevented and its dispersibility is increased. This results in a high polishing ratio and effective treatment. With the developed mixture, a controllable process can be applied to different types of surfaces. Contrary to the methods described above, it is aimed to develop the flow peening method to increase the surface strength of the products after basic manufacturing without surface polishing and removing any scale from the surface.
Detailed Description of the Invention
The invention relates to a paste mixture (paste set) developed for surface finishing processes and to a method of applying this paste mixture to the workpiece surface by flow forging. The surface strength of the workpiece is increased by the invention.
The flow peening method of the present invention is based on the application of a carrier and retention polymeric paste assembly containing spherical particles by flow to a workpiece surface to form homogeneous, residual stresses on said surface.
The method developed generally comprises the steps of applying a carrier and holding paste mixture containing spherical particles to a workpiece surface by flowing and forging the surface without removing chips from the surface .
One embodiment of the invention is called the GOV process .
The paste mixture applied in the developed method is also within the scope of the invention. The mixture comprises a carrier and retention paste containing spherical particles.
In one embodiment of the invention, the diameters of the spherical particles are different from each other. In one embodiment of the invention, the diameters of the spherical particles are in the range of 0.2-5 mm.
In one embodiment of the invention, the spherical particles are balls .
In one embodiment of the invention, the spherical particles comprise steel and / or stainless steel material.
In one embodiment of the invention, the paste is polymeric.
In one embodiment of the invention, the paste is of high viscosity. In one embodiment of the invention, the paste comprises spherical particles in the range of 10-80%. Preferably, it contains balls in the range of 10-80%.
In one embodiment of the invention, balls of 0.2-5 mm diameter spherical steel and / or stainless steel material are prepared in a very high viscosity paste in a ratio of 10% to 80% of the ball-paste.
It is then applied to the workpiece surface under high pressure.
One embodiment of the invention is applied to all metallic and non- metallic material surfaces according to the diameter of the balls and the viscosity of the polymeric holder and carrier paste.
In one embodiment of the invention, a homogeneous and low surface roughness value is obtained with the polymeric paste tool prepared with balls of different diameters .
No machining is applied to the surface in the method of the invention. In other words, no chip is removed from the surface in any scale. Spherical balls are applied to the surface with polymeric paste pressure. The mentioned pressure is obtained by forcing the high viscosity paste from a large diameter to a small diameter. A hard layer is obtained by forming residual stresses on the surface. In this way, the strength values of the workpiece are improved.
In one embodiment of the invention, the particles are applied to the workpiece surface homogeneously and at the desired pressure.
One embodiment of the invention increases the strength and working time of the material by creating residual stress on the surface. The balls used are preferably of different diameters. It provides forging of the surface, not removing the chip.
In one embodiment of the invention, the residual stresses are homogeneously formed by uniformly applying the balls to the workpiece surface with carrier and holding paste. In addition, the balls are applied to the workpiece surface by flow, not as bombardment. In this way, the surface roughness value of the workpiece is very low. In addition, in contrast to the ball forging process, surface collapse formation is prevented and surface quality is improved.
The invention provides, in contrast to the forging of the surface by bombardment in a conventional ball forging process, the application of spherical particles by flow to the workpiece surface with a specially prepared carrier and retention polymeric paste to achieve residual stresses on the surface.

Claims

1. A surface finishing method for increasing surface strength, characterized in that; characterized in that a carrier and holding paste mixture containing spherical particles is applied to a workpiece surface by flowing and forging the surface without removing the chip from the surface.
2. A method according to claim 1, characterized in that; and applying the paste with pressure generated by flowing the paste from a large diameter to a small diameter.
3. A method according to claim 1, characterized in that; diameters of spherical particles are different from each other.
4. A method according to claim 1, characterized in that; spherical particles are balls.
5. A method according to claim 1, characterized in that; the diameter of the spherical particles is in the range of 0.2-5 mm.
6. A method according to claim 1, characterized in that; spherical particles comprising steel and / or stainless steel material.
7. A method according to claim 1, characterized in that; the paste is polymeric.
8. A method according to claim 4, characterized in that; the ratio of the ball in the paste is in the range of 10-80%.
9. It is a paste tool suitable to be applied by flowing onto a workpiece surface to increase the surface strength, containing a carrier and holding paste having spherical particles.
10. A paste tool according to claim 9, characterized in that; diameters of spherical particles are different from each other.
11. A paste tool according to claim 9, characterized in that; spherical particles are balls.
12. A paste tool according to claim 9, characterized in that; the diameter of the spherical particles is in the range of 0.2- 5 mm.
13. A paste tool according to claim 9, characterized in that; spherical particles comprising steel and / or stainless steel material .
14. A paste tool according to claim 9, characterized in that; the paste is polymeric.
15. A paste tool according to claim 11, characterized in that; the ratio of the ball in the paste is in the range of 10-80%.
PCT/TR2019/051183 2018-12-31 2019-12-23 Flow peening process WO2020142038A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2018/21280 2018-12-31
TR201821280 2018-12-31

Publications (1)

Publication Number Publication Date
WO2020142038A1 true WO2020142038A1 (en) 2020-07-09

Family

ID=71407346

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2019/051183 WO2020142038A1 (en) 2018-12-31 2019-12-23 Flow peening process

Country Status (1)

Country Link
WO (1) WO2020142038A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5637029A (en) * 1993-11-22 1997-06-10 Lehane; William B. Method and apparatus for shot blasting materials
US20050133609A1 (en) * 2002-06-10 2005-06-23 Toru Matsubara Method for peening
CN102672625A (en) * 2011-03-17 2012-09-19 新东工业株式会社 Nozzle for shot peening and shot peening device with the nozzle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5637029A (en) * 1993-11-22 1997-06-10 Lehane; William B. Method and apparatus for shot blasting materials
US20050133609A1 (en) * 2002-06-10 2005-06-23 Toru Matsubara Method for peening
CN102672625A (en) * 2011-03-17 2012-09-19 新东工业株式会社 Nozzle for shot peening and shot peening device with the nozzle

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