WO2011077985A1 - 目玉部を有する板ばね装置と、板ばね装置の製造方法と、ショットピーニング装置 - Google Patents

目玉部を有する板ばね装置と、板ばね装置の製造方法と、ショットピーニング装置 Download PDF

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Publication number
WO2011077985A1
WO2011077985A1 PCT/JP2010/072357 JP2010072357W WO2011077985A1 WO 2011077985 A1 WO2011077985 A1 WO 2011077985A1 JP 2010072357 W JP2010072357 W JP 2010072357W WO 2011077985 A1 WO2011077985 A1 WO 2011077985A1
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WO
WIPO (PCT)
Prior art keywords
shot
eyeball
region
residual stress
leaf spring
Prior art date
Application number
PCT/JP2010/072357
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English (en)
French (fr)
Japanese (ja)
Inventor
彰 丹下
清 栗本
由利香 後藤
忠一 加藤
慎一 井之口
Original Assignee
日本発條株式会社
株式会社スミハツ
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 日本発條株式会社, 株式会社スミハツ filed Critical 日本発條株式会社
Priority to CN201080058726.0A priority Critical patent/CN102666016B/zh
Priority to KR1020127016138A priority patent/KR101412288B1/ko
Priority to MX2012007278A priority patent/MX346419B/es
Priority to IN4873DEN2012 priority patent/IN2012DN04873A/en
Publication of WO2011077985A1 publication Critical patent/WO2011077985A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/18—Leaf springs
    • F16F1/26—Attachments or mountings
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/18—Leaf springs
    • 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
    • C21D2221/00—Treating localised areas of an article
    • 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
    • C21D2221/00—Treating localised areas of an article
    • C21D2221/10—Differential treatment of inner with respect to outer regions, e.g. core and periphery, respectively
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2226/00—Manufacturing; Treatments
    • F16F2226/02—Surface treatments

Definitions

  • the present invention relates to a leaf spring device having an eyeball (eye) used for a vehicle suspension mechanism, a method for manufacturing the leaf spring device, and a shot peening device for the eyeball.
  • eye eye
  • shot peening device for the eyeball.
  • the leaf spring device used for the suspension mechanism of the vehicle has a steel leaf spring having an eyeball at the end, a bush inserted into the eyeball of the leaf spring, and the like. This leaf spring device is attached to a member on the vehicle body side via a bush. Further, shot peening is performed in order to improve the durability of the leaf spring. Shot peening generates compressive residual stress on the surface of the leaf spring by hitting a large number of shots made of, for example, cut wires on the surface of the leaf spring at high speed. In order to improve the durability of the eyeball portion, shot peening may be performed on the inner surface of the eyeball portion.
  • Japanese Patent Laid-Open No. 5-138535 Japanese Patent Publication No. 7-36982
  • FIG. 9 of Patent Document 1 discloses that shots are projected intensively on the lower part of the eyeball.
  • the effect of suppressing delayed fracture may be small depending on the eyeball part.
  • the outer diameter of the bush press-fitted into the eyeball part may be 0.5 mm or more larger than the inner diameter of the eyeball part.
  • the leaf spring if shot peening is concentrated on the lower part of the eyeball part, there may be little effect in suppressing delayed fracture after bush press-fitting.
  • an object of the present invention is to provide a leaf spring device, a shot peening device, and a method for manufacturing the leaf spring device that can suppress fatigue fracture and delayed fracture of the eyeball portion into which the bush is press-fitted.
  • the leaf spring device of the present invention is a leaf spring device comprising a leaf spring having an eyeball portion rounded around an end portion and a bush pressed into the eyeball portion, and is machined inside the eyeball portion. And an absolute value of the compressive residual stress of the first region including the winding start portion of the eyeball portion with respect to the distribution of compressive residual stress in the circumferential direction of the inner surface of the eyeball, and the center of the eyeball.
  • the absolute value of the compressive residual stress in the second region including the winding intermediate point on the vertical line passing through the region has a compressive residual stress distribution larger than the absolute value of the compressive residual stress in the other region of the inner surface of the eyeball .
  • the manufacturing method of the leaf spring device of the present invention includes a step of forming the eyeball portion by winding the end portion of the leaf spring in a round shape, and finishing the inner surface of the eyeball into a circular shape by scraping the inner surface of the eyeball portion.
  • a compressive residual stress is imparted to the inner surface of the eyeball by projecting a shot onto the inner surface of the eyeball, and a winding start portion of the eyeball portion with respect to a distribution of compressive residual stress in the circumferential direction of the inner surface of the eyeball
  • the absolute value of the compressive residual stress of the first region including the absolute value of the compressive residual stress of the second region including the winding intermediate point on the vertical line passing through the center of the eyeball is stored in the other region of the inner surface of the eyeball. It is larger than the absolute value of stress.
  • a shot peening apparatus for performing shot peening on the inner surface of the eyeball includes a shot injection nozzle inserted inside the eyeball portion, and a shot projected from the shot injection nozzle having a reflective surface facing the shot injection nozzle. Is reflected by the reflecting surface and directed toward the inner surface of the eyeball, and the reflecting surface reflects the amount of shot reflected toward the first region and the second region in the other region. The shape is such that it is larger than the amount of shots reflected toward.
  • the angle formed by the reflecting surface with respect to the axis of the shot reflecting member is set such that the projection angle of the shot reflected by the reflecting surface is more than 0 ° and not more than 45 °. Good.
  • a leaf spring device in which a bush is press-fitted into an eyeball part, it is possible to sufficiently apply compressive residual stress to a location effective in suppressing fatigue fracture and delayed fracture of the eyeball part. Reliability can be increased.
  • FIG. 1 is a front view of a leaf spring device according to a first embodiment of the present invention.
  • FIG. 2 is an enlarged front view showing the center part of the leaf spring device shown in FIG.
  • FIG. 3 is a cross-sectional view showing the eyeball part and the bush shown in FIG. 2 in a separated state.
  • FIG. 4 is a front view showing only the centerpiece shown in FIG.
  • FIG. 5 is a side view of the center part shown in FIG. 2 and a part of a tool for shaving.
  • FIG. 6 is a side view of the center part shown in FIG. 2 and a part of an apparatus for performing inner surface shot peening.
  • FIG. 7 is a perspective view of the shot reflecting member of the shot peening apparatus according to the second embodiment of the present invention.
  • FIG. 1 is a front view of a leaf spring device according to a first embodiment of the present invention.
  • FIG. 2 is an enlarged front view showing the center part of the leaf spring device shown in FIG.
  • FIG. 3 is
  • FIG. 8 is a side view of the shot reflecting member shown in FIG.
  • FIG. 9 is a perspective view of a shot reflecting member of a shot peening apparatus according to the third embodiment of the present invention.
  • FIG. 10 is a front view of the shot reflecting member shown in FIG.
  • FIG. 11 is a side view showing a shot peening apparatus according to the fourth embodiment of the present invention.
  • FIG. 12 is a perspective view of a shot reflecting member of the shot peening apparatus shown in FIG.
  • FIG. 13 is a front view of the shot reflecting member shown in FIG.
  • FIG. 14 is a perspective view of a shot reflecting member according to the fifth embodiment of the present invention.
  • FIG. 15 is a side view showing a shot peening apparatus according to the sixth embodiment of the present invention.
  • a leaf spring device 10 shown in FIG. 1 is used for a suspension mechanism of a vehicle such as an automobile.
  • the leaf spring device 10 includes a steel leaf spring 11 having eyeball portions 12 at both ends, and a bush 20 press-fitted into the eyeball portion 12.
  • the leaf spring 11 is attached to a vehicle suspension mechanism (not shown) and elastically supports the load of the vehicle. For this reason, the sprung weight of the vehicle is loaded on the eyeball portion 12, and tensile stress repeatedly acts on the eyeball portion 12 when the vehicle is accelerated or decelerated.
  • a stacked leaf spring device is configured by overlapping a child plate (not shown) in the thickness direction of the leaf spring 11.
  • spring steel An example of the material (spring steel) of the leaf spring 11 is SUP11.
  • Examples of chemical components (mass%) are C: 0.56 to 0.64, Si: 0.15 to 0.35, Mn: 0.70 to 1.00, P: 0.035 or less, S: 0.00. 035 or less, Cr: 0.70 to 1.00, B: 0.0005 or more, and the balance Fe.
  • spring steels of other steel types may be used.
  • an example of the bush 20 includes a metal outer cylinder 21, an inner cylinder 22, and an elastic member 23.
  • the elastic member 23 is made of an elastic material such as rubber and is provided between the outer cylinder 21 and the inner cylinder 22.
  • the leaf spring 11 is subjected to heat treatment such as quenching and tempering.
  • a region between a pair of eyeball portions 12 provided at both ends of the leaf spring 11 is a strip-shaped leaf portion 11a.
  • the eyeball portion 12 is formed at both ends of the leaf portion 11a.
  • the eyeball part 12 of this embodiment is wound roundly upward from both ends of the leaf part 11a. That is, the eyeball portion 12 is an up-turned eyeball.
  • a slight gap G is formed between the plate end 12a of the eyeball portion 12 and the upper surface of the leaf portion 11a.
  • the surface of the leaf spring 11 is shot peened by a first shot peening device 25 (partially shown in FIG. 1).
  • the first shot peening device 25 projects the shot 26 in the tangential direction of the impeller rotating at high speed while moving the leaf spring 11. By hitting the shot 26 around the entire circumference of the leaf spring 11, compressive residual stress is generated on the outer surface of the leaf spring 11.
  • an eyeball inner surface 30 is formed inside the eyeball portion 12.
  • the eyeball inner surface 30 is subjected to a shaving process and shot peening, which will be described later.
  • the eyeball inner surface 30 has a first region S1 (portion indicated by lower hatching in FIGS. 2 and 4) and a second region S2 (portion indicated by upper hatching in FIGS. 2 and 4). ing.
  • the first region S ⁇ b> 1 includes a winding start portion 31.
  • the second region S2 includes a winding intermediate point 32 on the vertical line V passing through the center of the eye C1.
  • the second region S2 includes a position P1 returned from the winding intermediate point 32 by the angle ⁇ toward the winding start portion 31 side.
  • the angle ⁇ is about 20 °.
  • the second region S2 is located on the opposite side of the first region S1 across the center of the eyeball C1, that is, on the uppermost portion of the eyeball inner surface 30.
  • the inner surface 30 of the centerpiece is finished in a circular shape by cutting using a cutting tool 40 such as a reamer.
  • a cutting tool 40 such as a reamer.
  • the cutting tool 40 is inserted into the eyeball portion 12 while rotating.
  • the roundness of the eyeball inner surface 30 is increased by this shaving process.
  • the inner surface 30 of the eyeball is finished so that the inner diameter D1 of the inner surface 30 of the eyeball is slightly smaller than the outer diameter D2 of the bush 20.
  • the difference between D1 and D2 is, for example, 0.7 mm or less.
  • the second shot peening apparatus 50 includes a shot injection nozzle 51 inserted into the eyeball portion 12, a shot reflecting member 52, a drive mechanism 53, a compressed air supply source 54, a shot supply source 55, and a shot supply hose. 56.
  • the shot reflecting member 52 is fixed to the shot spray nozzle 51 by a shaft 57.
  • the reflection surface 58 of the shot reflecting member 52 is disposed at a position facing the injection port of the shot injection nozzle 51.
  • the drive mechanism 53 has a function of moving the shot injection nozzle 51 and the shot reflecting member 52 in the axial direction of the eyeball portion 12 (the direction indicated by the arrow X1 in FIG. 6).
  • the shot spray nozzle 51 and the shot reflecting member 52 may be fixed, and the eyeball portion 12 may be relatively moved in the direction indicated by the arrow X2 in FIG.
  • the drive mechanism 53 is only required to move the shot reflecting member 52 and the shot injection nozzle 51 relative to the inner surface 30 of the eyeball in the axial direction of the eyeball portion 12.
  • An example of the shot reflecting member 52 has a triangular pyramid cone shape arranged concentrically with the shot injection nozzle 51.
  • the shot 60 projected from the shot injection nozzle 51 is reflected by the reflection surface of the shot reflecting member 52.
  • the reflected shot 60 is projected onto the eyeball inner surface 30 by changing the direction in the radial direction of the shot reflecting member 52.
  • An example of the shot 60 is a round cut wire having a shot size (particle diameter) of ⁇ 1.3 mm, or a cut wire having a shot size of ⁇ 1.0 mm.
  • the shot 60 is projected at a high speed (for example, a projection speed of 76.7 m / sec) toward the inner surface 30 of the eyeball.
  • An example of the projection pressure is 0.5 MPa
  • the projection amount is, for example, 200 g / second
  • the projection time is 3 to 30 seconds.
  • the center line C3 of the shot injection nozzle 51 and the shot reflecting member 52 is set to the first region S1 by an offset amount T with respect to the center line C2 of the eyeball portion 12. Let it move to the side. Under this state, the shot injection nozzle 51 and the shot reflecting member 52 are moved in the axial direction X1.
  • the center line C3 of the shot injection nozzle 51 and the shot reflecting member 52 is shifted toward the second region S2 side with respect to the center line C2 of the eyeball portion 12. Under this state, the shot injection nozzle 51 and the shot reflecting member 52 are moved in the axial direction X1.
  • the compressive residual stress in the first and second regions S1, S2 can be made larger than the compressive residual stress in the other region S3. .
  • FIGS. 7 and 8 show a shot reflecting member 52 according to the second embodiment.
  • the shot reflecting member 52 has two reflecting surfaces 58.
  • the shots 60 reflected by the reflecting surfaces 58 are intensively projected toward the first and second regions S1 and S2.
  • the shot reflecting member 52 has a pair of main reflecting surfaces 58 and a pair of sub reflecting surfaces 59.
  • a large amount of shots 60 reflected by the main reflection surface 58 are intensively projected toward the first and second regions S1 and S2, and a small amount of shots 60 reflected by the sub-reflection surface 59 Is projected toward the region S3.
  • FIG. 11 to 13 show a shot peening apparatus 50 'according to the fourth embodiment.
  • the shot injection nozzle 51 and the shot reflecting member 52 are configured separately.
  • the shot reflecting member 52 has a pair of reflecting surfaces 58. These reflecting surfaces 58 are opposed to the shot injection nozzle 51.
  • the eyeball portion 12 and the shot injection nozzle 51 are fixed, the shot reflecting member 52 is moved in the direction of the axis X1.
  • the eyeball portion 12 is configured to relatively move in the direction indicated by the arrow X2. Since other than that is the same as that of the shot peening apparatus 50 of 1st Embodiment shown in FIG. 6, description is abbreviate
  • the angle formed by the reflecting surface 58 with respect to the axis C3 of the shot reflecting member 52 is ⁇ .
  • This angle ⁇ is set to be less than 45 ° ( ⁇ ⁇ 45 °) so that the shot projection angle ⁇ satisfies 0 ⁇ ⁇ 45 °.
  • the projection angle ⁇ is an angle formed by the shot projection direction with respect to the normal Z of the projection surface (eyeball inner surface 30). When the projection angle ⁇ exceeds 45 °, the shot energy of the shot that collides with the projection surface (the inner surface 30 of the eyeball) is remarkably reduced, so that the shot peening effect is remarkably lowered.
  • the shot projection angle ⁇ is 0 °
  • the shot 60 facing the projection surface (eyeball inner surface 30) interferes with the shot 60a reflected by the projection surface (eyeball inner surface 30).
  • the projection angle ⁇ is preferably 0 ° or more.
  • the distance from the reflecting surface 58 to the eyeball inner surface 30 is large, the interference between the shot 60a reflected by the eyeball inner surface 30 and the shot 60 facing the eyeball inner surface 30 is not substantially a problem. It may be 0 °.
  • the shot reflecting member 52 may be reciprocally rotated around the axis (in the direction indicated by the arrow R) within a range of, for example, 0 to 45 °. By doing so, it is possible to concentrate the shots in the first region S1 and the second region S2 and to project the shots in the other region S3.
  • FIG. 14 shows the shot reflecting member 52 of the fifth embodiment.
  • the shot reflecting member 52 has a pair of main reflecting surfaces 58 and a pair of sub reflecting surfaces 59.
  • a large amount of shots 60 reflected by the main reflection surface 58 are intensively projected toward the first and second regions S1 and S2, and a small amount of shots 60 reflected by the sub-reflection surface 59 Is projected toward the region S3.
  • FIG. 15 shows a shot peening apparatus 50 ′′ according to the sixth embodiment.
  • a shot reflecting member 52 of the shot peening apparatus 50 ′′ has a reflecting surface 58 that is inclined only in one direction.
  • the angle ⁇ formed by the reflecting surface 58 with respect to the axis C3 of the shot reflecting member 52 is less than 45 °. That is, the angle ⁇ of the reflecting surface 58 is set so that the shot projection angle ⁇ with respect to the normal Z of the projection surface (eyeball inner surface 30) satisfies 0 ⁇ ⁇ 45 °.
  • the area of the reflection surface 58 is larger than the shot projection area of the shot injection nozzle 51.
  • the deviation of the axis C3 relative to the shot injection nozzle 51 can be absorbed to some extent by rotating the shot reflecting member 52 around the axis C3.
  • Areas S1 and S2 of 2 are places where the compressive residual stress is desired to be larger than those of other areas S3, and when the shot is projected onto these areas S1 and S2, the rotational speed of the shot reflecting member 52 is slowed down.
  • the shot peening is performed mainly by the following: When projecting a shot to the other region S3, the shot reflecting member 52 is accelerated to perform the shot peening for a short time.
  • a desired compressive residual stress distribution can be imparted in the circumferential direction of the inner surface 30.
  • Embodiment of the shot peening apparatus 50 ' is omitted because it is similar to the shot peening apparatus 50 of FIG. 11.
  • the compressive residual stress was measured when shot peening was performed with the black skin remaining on the inner surface 30 of the eyeball without performing the above-described cutting. As a result of the measurement, the compressive residual stress in the first region S1 was ⁇ 408 MPa. On the other hand, the compressive residual stress was also measured when shot peening was performed in the state where the shaving process was performed on the inner surface 30 of the eyeball and the black skin was removed. The measurement result was -498 MPa, and an absolute value as high as 90 MPa was obtained compared to the case where shot peening was performed with the black skin remaining.
  • the compressive residual stress value is represented by minus.
  • the compressive residual stress in the first and second regions S1, S2 could be expressed more effectively.
  • the absolute value of the compressive residual stress in the first region S1 is ⁇ 1
  • the absolute value of the compressive residual stress in the second region S2 is ⁇ 2
  • the absolute value of the compressive residual stress in the other region S3 in the circumferential direction is ⁇ 3.
  • the distribution of compressive residual stress in the circumferential direction of the inner surface 30 provided by the inner surface shot peening process is such that ⁇ 1 and ⁇ 2 are larger than ⁇ 3 by, for example, 5 to 10% or more.
  • the compressive residual stress in the first and second regions S1, S2 is ⁇ 498 MPa or more.
  • the compressive residual stress in the other region S3 is around ⁇ 400 MPa.
  • the gradient of the compressive residual stress distribution becomes too large, a portion where the gradient is large may be a starting point of breakage. For this reason, it is preferable to make the gradient of the compressive residual stress distribution gentle.
  • the bush 20 is press-fitted into the eyeball portion 12.
  • the outer diameter D2 (shown in FIG. 2) of the bush 20 is slightly larger than the inner diameter D1 of the eyeball portion 12 in a free state before the bush 20 is inserted.
  • the difference between D1 and D2 is, for example, about 0.5 to 0.7 mm. Therefore, the eyeball portion 12 is accommodated inside the eyeball portion 12 in a state in which the diameter of the bush 20 is slightly larger than that in the free state when the bush 20 is press-fitted.
  • the eyeball inner surface 30 has the roundness and surface accuracy of the eyeball inner surface 30 increased since the shaving process is performed in advance before the bush 20 is press-fitted.
  • the inner diameter D1 of the eyeball portion 12 is finished to be slightly larger than the outer diameter D2 of the bush 20 by the cutting step. For this reason, the entire circumference of the bush 20 can be brought into close contact with the eyeball inner surface 30 with high accuracy.
  • the manufacturing method of the leaf spring device 10 of the present embodiment includes the following steps. (1) The process of forming the eyeball part 12 by heating the end part of the leaf
  • the compressive residual stress is such that the absolute values ⁇ 1, ⁇ 2 of the compressive residual stress in the first and second regions S1, S2 are larger than the absolute value ⁇ 3 of the compressive residual stress in the other region S3.
  • the leaf spring device can be implemented, including the leaf spring leaf portion, eyeball portion, bush shape, and structure.
  • the eyeball portion is not limited to the up-turned eye as described in the above embodiment, but may be a down-turned eye.

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
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PCT/JP2010/072357 2009-12-24 2010-12-13 目玉部を有する板ばね装置と、板ばね装置の製造方法と、ショットピーニング装置 WO2011077985A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201080058726.0A CN102666016B (zh) 2009-12-24 2010-12-13 具有卷耳部的板簧装置、板簧装置的制造方法及喷丸加工装置
KR1020127016138A KR101412288B1 (ko) 2009-12-24 2010-12-13 아이부를 갖는 판 스프링 장치와, 판 스프링 장치의 제조 방법과, 쇼트 피닝 장치
MX2012007278A MX346419B (es) 2009-12-24 2010-12-13 Dispositivo de muelle laminado que tiene un ojal, método de fabricación del dispositivo de muelle laminado, y aparato de granallado.
IN4873DEN2012 IN2012DN04873A (es) 2009-12-24 2010-12-13

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009-293414 2009-12-24
JP2009293414A JP5450041B2 (ja) 2009-12-24 2009-12-24 目玉部を有する板ばね装置と、板ばね装置の製造方法と、ショットピーニング装置

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WO2011077985A1 true WO2011077985A1 (ja) 2011-06-30

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CN105431651A (zh) * 2014-05-28 2016-03-23 日本发条株式会社 悬架用弹簧装置以及悬架用螺旋弹簧
AT520621A1 (de) * 2017-10-16 2019-05-15 Hendrickson Comm Vehicle Sys Europe Gmbh Federblatt und Verfahren zur Herstellung eines Federblattes

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JP6007097B2 (ja) * 2012-12-20 2016-10-12 日本発條株式会社 懸架用ばね装置と、懸架用コイルばね
CN103453059A (zh) * 2013-07-31 2013-12-18 漯河君叁材料高科有限公司 具有开口式整体卷耳的复合材料板式弹簧
JP6601436B2 (ja) * 2017-02-15 2019-11-06 トヨタ自動車株式会社 ブッシュ付きリーフスプリング
US11293738B2 (en) 2018-12-31 2022-04-05 Apex Brands, Inc. Method and apparatus for providing a measuring tape with increased cupping

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AT520621A1 (de) * 2017-10-16 2019-05-15 Hendrickson Comm Vehicle Sys Europe Gmbh Federblatt und Verfahren zur Herstellung eines Federblattes
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AT520621B1 (de) * 2017-10-16 2023-04-15 Hendrickson Comm Vehicle Sys Europe Gmbh Federblatt und Verfahren zur Herstellung eines Federblattes

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MX346419B (es) 2017-03-21
JP2011131338A (ja) 2011-07-07
KR101412288B1 (ko) 2014-06-25
IN2012DN04873A (es) 2015-09-25
CN102666016B (zh) 2014-12-03
CN102666016A (zh) 2012-09-12
MY156148A (en) 2016-01-15
JP5450041B2 (ja) 2014-03-26
MX2012007278A (es) 2012-07-20
KR20120085327A (ko) 2012-07-31

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