US3886774A - Method and means for shot peening of tubes - Google Patents

Method and means for shot peening of tubes Download PDF

Info

Publication number
US3886774A
US3886774A US472470A US47247074A US3886774A US 3886774 A US3886774 A US 3886774A US 472470 A US472470 A US 472470A US 47247074 A US47247074 A US 47247074A US 3886774 A US3886774 A US 3886774A
Authority
US
United States
Prior art keywords
tube
straight
shot peening
nozzle assembly
peening
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.)
Expired - Lifetime
Application number
US472470A
Other languages
English (en)
Inventor
Sven Sixten Stromstedt
Sven Borje Bystrom
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.)
Kraftwerk Union AG
Original Assignee
Kraftwerk Union AG
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 Kraftwerk Union AG filed Critical Kraftwerk Union AG
Application granted granted Critical
Publication of US3886774A publication Critical patent/US3886774A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • 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

  • This invention relates to shot peening of tubes, and is concerned with shot peening a tube that has a straight portion and a bent portion in such manner that the resulting compressive stresses are uniformly distributed over the surface of the whole tube.
  • the present invention takes advantage of the fact that certain movements of the workpiece and the apparatus are easy to perform, while other movements are difficult to perform. It is simple to move the tube lengthwise in a straight path. It is also simple to move the shot peening nozzles a short distance because the nozzles are connected with the peening machinery by means of flexible hoses. It is difficult to move the tube with a rotary movement of a vertical axis, because of the great length of the tube. It is also difficult to move the peening nozzles a long way, because this would require a too long connection between the machiner and the nozzles.
  • the invention is based on the idea of separating the relative movements of the tube and the peening device so that the tube is moved when straight portions are being peened and the peening device is moved when curved portions of the tube are being peened.
  • This separation of the mutual movements of the tube and the peening device means that the movements are limited to those which are easy to perform, i.e. linear movement of the tube and a short movement of the peening device.
  • Such movements that are difficult to perform, i.e. turning of the tube and an extended movement of the peening device have been eliminated. In this way thereby it has been made possible to shot peen tubes with alternating curved and straight portions so that all parts of the tube are uniformly peened.
  • the said separation of the movements gives also the additional effect that the apparatus easily can be set for different radii of the tube bends.
  • FIG. 1 is a top view of a shot peening device according to the invention
  • FIG. 2 is a side view of the peening device
  • FIG. 3 is section 3-3 in FIG. 2 drawn on a larger scale
  • FIGS. 4 and 5 are different patterns of the effective areas of the peening jets.
  • the figures show a device according to the invention for shot peening U-shaped tubes for heat exchangers in, for instance, atomic power plants.
  • the starting position before peening is shown in full lines in FIG. 1.
  • the tube 10 rests on a bed of rollers 11 and the curved portion of the tube is held by a gripping arm 12 on a sledge 13, which can move along a guide 14.
  • a shot peening nozzle assembly 15 is placed in the extension of the shank of the tube shown as the upper shank in the figure.
  • the nozzle assembly 15 is shown in a side veiw on a larger scale in FIG. 3. It comprises a number of shot peening nozzles, placed concentrically around a center and directed towards the center.
  • the nozzle set is mounted on a bracket 17, which can be turned on a vertical axis 18.
  • the nozzles are, in practice, associated with the conventional hoses (not shown) for delivering the necessary jets of peening shot.
  • the peening is performed by blowing particles, for instance glass balls, through the nozzles 16 against the center of the nozzle assembly 15.
  • the sledge is moved by a mechanism along the path 14, so that the shank 20 of the tube 10 passes through the nozzle assembly 15.
  • the sledge 13 is stopped.
  • the nozzle assembly 15 is swung along the tube bend 21 in the direction of the arrow 23 to the position 15a, and during this movement the bend is shot peened.
  • the holder can be temporarily let down to the position 12a.
  • the nozzle assembly In the third phase of the procedure the nozzle assembly is held stationary in the position 15a, and the sledge 13 is moved back to its starting position. During this movement the other shank 22 of the tube is shot peened.
  • the sledge device 12, l3, 14 may alternatively be placed above the tube, as shown in broken lines 12a, 13a, 14a in FIG. 2, in order to have a clear floor surface.
  • the distance between the axis 18 and the center of the nozzle assembly should, of course, be the same as the radius of the tube bend.
  • the nozzle assembly 15 can be moved on the bracket 17 towards, or away from, the axis 18.
  • assembly 15 may be removably secured to bracket 17, by means of a bolt 30, and assembly 15 may be moved from one location toward, or away from, axis 18 by securing it to the bracket at one or another of a plurality of spaced bolt holes 31, 31 as shown in FIG. 3.
  • FIG. 1 is shown in dashed lines a tube 10b having a bend with a greater radius, the nozzle set having .to be moved to the position 15b.
  • the left hand position in FIG. 1 of the sledge 13 has to be adjusted so that the center of the bend coincides with the rotation axis 18 of the nozzle assembly.
  • the tube When shot peening is performed on straight tubes without bends the tube is usually rotated on its axis at the same time as it is fed axially through the peening apparatus. The purpose of this is to distribute the peening effect as uniformly as possible. When peening is performed on tubes with bends it is, of course, impossible to rotate the tube on its axis. Because of this, other means must be used to provide for uniform peening effect around the tube. As the peening jet is conical and has a circular cross section it is difficult to obtain a uniform effect if the axii of the nozzles 16 lie in the same plane because the areas of action of the peening jets must partly cover each other as shown in FIG. 4, in order to cover the whole periphery.
  • Device for shot peening the external surface of a partly straight and partly curved tube comprising a nozzle assembly having a number of shot peening nozzles that are concentric with the tube and directed towards the tube, means for moving the tube in a straight path thereby passing a'straight part of the tube through the nozzle assembly. and means for moving the nozzle assembly about a bend of the tube.
  • Every first nozzle is somewhat inclined to one side and every second nozzle to the other side of the nozzle assembly.
US472470A 1973-05-30 1974-05-22 Method and means for shot peening of tubes Expired - Lifetime US3886774A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7307682*A SE368423B (ja) 1973-05-30 1973-05-30

Publications (1)

Publication Number Publication Date
US3886774A true US3886774A (en) 1975-06-03

Family

ID=20317640

Family Applications (1)

Application Number Title Priority Date Filing Date
US472470A Expired - Lifetime US3886774A (en) 1973-05-30 1974-05-22 Method and means for shot peening of tubes

Country Status (11)

Country Link
US (1) US3886774A (ja)
JP (1) JPS564607B2 (ja)
AT (1) AT330607B (ja)
BE (1) BE815677A (ja)
BR (1) BR7404361D0 (ja)
CA (1) CA991389A (ja)
ES (1) ES426740A1 (ja)
FR (1) FR2231475B1 (ja)
GB (1) GB1408379A (ja)
IT (1) IT1012417B (ja)
SE (1) SE368423B (ja)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4228671A (en) * 1979-04-02 1980-10-21 Superior Industries International, Inc. Process for making a vehicle wheel
US4616496A (en) * 1985-05-07 1986-10-14 Westinghouse Electric Corp. Rotopeening apparatus having a flexible spindle
US4616497A (en) * 1985-05-07 1986-10-14 Westinghouse Electric Corp. Rotopeening method
US4616498A (en) * 1985-05-07 1986-10-14 Westinghouse Electric Corp. Multi-spindle rotopeening apparatus
US4619128A (en) * 1985-05-07 1986-10-28 Westinghouse Electric Corp. Spindle for rotopeening apparatus
US4713952A (en) * 1986-02-05 1987-12-22 Westinghouse Electric Corp. Tool and method for rotopeening the peripheral tubes in a tubesheet
US5515707A (en) * 1994-07-15 1996-05-14 Precision Tube Technology, Inc. Method of increasing the fatigue life and/or reducing stress concentration cracking of coiled metal tubing
US20140373585A1 (en) * 2013-06-20 2014-12-25 Foster Wheeler North America Corp. Method of and Apparatus for Shot Peening Stainless Steel Tubing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1193692B (it) * 1982-02-25 1988-07-21 Staar Sa Sistema per rivelare la faccia operativa di un disco avente dati registrati su una sola faccia
JPS61171545U (ja) * 1985-04-11 1986-10-24

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3142590A (en) * 1962-05-23 1964-07-28 Om Edwards Co Inc Method for vehicle washing
US3531964A (en) * 1967-08-31 1970-10-06 Nasa Controlled glass bead peening
US3668912A (en) * 1970-07-08 1972-06-13 Carborundum Co Shot peening apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3142590A (en) * 1962-05-23 1964-07-28 Om Edwards Co Inc Method for vehicle washing
US3531964A (en) * 1967-08-31 1970-10-06 Nasa Controlled glass bead peening
US3668912A (en) * 1970-07-08 1972-06-13 Carborundum Co Shot peening apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4228671A (en) * 1979-04-02 1980-10-21 Superior Industries International, Inc. Process for making a vehicle wheel
US4616496A (en) * 1985-05-07 1986-10-14 Westinghouse Electric Corp. Rotopeening apparatus having a flexible spindle
US4616497A (en) * 1985-05-07 1986-10-14 Westinghouse Electric Corp. Rotopeening method
US4616498A (en) * 1985-05-07 1986-10-14 Westinghouse Electric Corp. Multi-spindle rotopeening apparatus
US4619128A (en) * 1985-05-07 1986-10-28 Westinghouse Electric Corp. Spindle for rotopeening apparatus
US4713952A (en) * 1986-02-05 1987-12-22 Westinghouse Electric Corp. Tool and method for rotopeening the peripheral tubes in a tubesheet
US5515707A (en) * 1994-07-15 1996-05-14 Precision Tube Technology, Inc. Method of increasing the fatigue life and/or reducing stress concentration cracking of coiled metal tubing
US20140373585A1 (en) * 2013-06-20 2014-12-25 Foster Wheeler North America Corp. Method of and Apparatus for Shot Peening Stainless Steel Tubing

Also Published As

Publication number Publication date
ES426740A1 (es) 1976-07-16
BE815677A (fr) 1974-09-16
IT1012417B (it) 1977-03-10
DE2354153B2 (de) 1976-12-30
ATA439574A (de) 1975-09-15
JPS5020928A (ja) 1975-03-05
AT330607B (de) 1976-07-12
BR7404361D0 (pt) 1975-01-07
GB1408379A (en) 1975-10-01
JPS564607B2 (ja) 1981-01-31
CA991389A (en) 1976-06-22
SE368423B (ja) 1974-07-01
FR2231475B1 (ja) 1977-09-30
DE2354153A1 (de) 1974-12-12
FR2231475A1 (ja) 1974-12-27

Similar Documents

Publication Publication Date Title
US3886774A (en) Method and means for shot peening of tubes
CN108754122B (zh) 一种自动超声冲击消除焊接残余应力装置
US4827953A (en) Flexible lance for steam generator secondary side sludge removable
US1910497A (en) Sand blast gun
US4444556A (en) Cooling apparatus
US3668912A (en) Shot peening apparatus
JPS5536046A (en) Welding method and device for impeller
US3671028A (en) Quench system for pipes
GB834763A (en) Improvements in blowing frame for tempering glass sheets
US4517434A (en) Method and apparatus for manufacturing a tube bend metal
US2982007A (en) Apparatus for shot peening elongated articles
US4230426A (en) Method for treating conduit to improve flow characteristic and resulting conduit product
CN207862431U (zh) 抽油杆表面热喷涂装置
US4632297A (en) Method and apparatus for feeding shape-welded workpieces immediately after formation
JP3222016U (ja) 曲げ加工管の製造装置
US3705510A (en) Shot peening method
US2818083A (en) Method of internally alloy coating tubular bodies
US6105539A (en) Steam generator top of tube bundle deposit removal apparatus
CN214212696U (zh) 一种不锈钢工业管焊接装置
EP0459597A1 (en) Flexible lance for steam generator secondary side sludge removal
JPS6072626A (ja) 拡張された管の内壁における残留応力を減少させるための方法と装置
US3509303A (en) Method of and apparatus for welding
EP3908427A2 (en) Abrasive blast treatment machine for surfaces of large-scale workpieces
RU213646U1 (ru) Ультразвуковой инструмент для упрочнения внутренних цилиндрических поверхностей металлических изделий
CN109852786A (zh) 油气管道焊接的焊后处理装置