WO2010150753A1 - 金属製部品の破断開始部形成方法 - Google Patents

金属製部品の破断開始部形成方法 Download PDF

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Publication number
WO2010150753A1
WO2010150753A1 PCT/JP2010/060487 JP2010060487W WO2010150753A1 WO 2010150753 A1 WO2010150753 A1 WO 2010150753A1 JP 2010060487 W JP2010060487 W JP 2010060487W WO 2010150753 A1 WO2010150753 A1 WO 2010150753A1
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WIPO (PCT)
Prior art keywords
forming
connecting rod
fracture
groove
start portion
Prior art date
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PCT/JP2010/060487
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English (en)
French (fr)
Japanese (ja)
Inventor
浩一 長谷
Original Assignee
株式会社安永
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Application filed by 株式会社安永 filed Critical 株式会社安永
Priority to KR1020117022843A priority Critical patent/KR101775168B1/ko
Priority to CN2010800215272A priority patent/CN102427911A/zh
Publication of WO2010150753A1 publication Critical patent/WO2010150753A1/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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
    • F16C9/04—Connecting-rod bearings; Attachments thereof
    • F16C9/045—Connecting-rod bearings; Attachments thereof the bearing cap of the connecting rod being split by fracturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P13/00—Making metal objects by operations essentially involving machining but not covered by a single other subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P13/00—Making metal objects by operations essentially involving machining but not covered by a single other subclass
    • B23P13/02—Making metal objects by operations essentially involving machining but not covered by a single other subclass in which only the machining operations are important
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/42—Groove sizes
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/44—Hole or pocket sizes
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/10—Application independent of particular apparatuses related to size
    • F16C2300/12—Small applications, e.g. miniature bearings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/22—Internal combustion engines

Definitions

  • the present invention relates to a method for forming a fracture start portion of a metal part that forms a fracture start portion of a metal part such as a connecting rod of an automobile (hereinafter simply referred to as a “connecting rod”).
  • a technique for forming a fracture start portion composed of a groove-like shape or a linearly continuous recess portion at a position facing each other in the thickness direction Conventionally known (see, for example, Patent Document 1).
  • Patent Document 1 In forming such a fracture start portion, in Patent Document 1, a laser device is used. In order to form an accurate break start portion with a laser device, it is necessary to install and install an expensive device that costs tens of millions of yen. For this reason, there is a case in which a break starting portion having a V-shaped groove is formed by using a dedicated broaching machine instead of the laser device.
  • a plurality of recesses spaced by a predetermined interval may be formed by machining through a dedicated saw blade without forming a groove (for example, Patent Documents). 2).
  • a YAG laser device is used as the above laser device.
  • a problem of forming a fracture start portion of a metal part when this YAG laser apparatus is used will be described.
  • a flash lamp that excites laser light generally has to be replaced periodically, which increases the running cost.
  • a YAG laser device fails, it cannot be handled by normal maintenance personnel, and there is a concern that it may cause a line stop for a long time due to a laser failure.
  • Such a long-time line stop also induces a line stop in the subsequent post process, leading to a line stop of the entire production line and causing a significant deviation in the production plan.
  • metal parts may be forged or sintered depending on the manufacturing method.
  • a connecting rod made of forging or a connecting rod made of sintering is formed as a part of a metal part, when a fracture start portion consisting of a simple V-shaped groove is formed, Common problems arise.
  • the connecting rod made of either forging or sintering when the V-shaped groove is formed by broaching, if the broaching blade is new, the R of the groove bottom of the V-shaped groove is reduced, and the connecting rod is made by a mandrel. When the large end portion is broken, a fracture surface within an allowable range is obtained. However, when the broaching blade is worn due to long-term use, the R at the groove bottom of the V-shaped groove becomes large, and therefore a uniform fracture surface may not be obtained when the connecting rod large end is expanded with a mandrel. . Further, when a V-shaped groove is machined using a worn broach blade, the pulling force at the time of breaking the connecting rod increases, and the power of the connecting rod breaking device is required accordingly, which is contrary to the demand for energy saving.
  • the groove is removed by boring after the connecting rod breaking process, but such dimples remain in a range that cannot be removed by boring.
  • Such dimples are produced by plastic deformation of the connecting rod fracture surface when the connecting rod breaks, and when connecting the connecting rod fracture surfaces with such dimples remaining forcibly, the stress of that part becomes high, It becomes a problem at the final product stage.
  • An object of the present invention is to provide a method for forming a fracture start portion of a metal part that can obtain a stable fracture surface after fracture at a low cost.
  • a method for forming a fracture start portion of a metal part according to claim 1 of the present invention includes: A first step of forming a groove by machining in a portion corresponding to the fracture start portion of the metal part; And a second step of forming a plurality of recesses at predetermined intervals in the bottom portion of the groove.
  • the method for forming a fracture start portion of a metal part according to claim 1 of the present invention it is possible to solve a problem that occurs when a fracture start portion of a metal part is formed using a YAG laser device. Specifically, an expensive running cost is not required due to periodic replacement of a laser excitation flash lamp. In addition, it is not necessary to incur a line stop for a long period due to the fact that the maintenance inspector cannot cope with the failure of the YAG laser apparatus. Thereby, a broken product can be produced according to a predetermined production plan.
  • the fracture start part formation method of the metal part according to claim 2 of the present invention is the fracture start part formation method of the metal part according to claim 1, In the first step, the groove is formed by broaching.
  • the method for forming a fracture start portion of a metal part according to claim 2 of the present invention it is possible to solve the problem in the case where the groove portion of the fracture start portion of the metal part is formed by broaching. Specifically, even if the metal part is made by either forging or sintering, when the groove part is formed using a worn broach blade and then fractured, a recessed part is formed at a predetermined interval at the bottom part of the groove part. Thanks to this, a stable fracture surface can be obtained.
  • the method for forming a fracture start part of a metal part according to claim 3 of the present invention is the method for forming a fracture start part of a metal part according to claim 1 or 2, In the first step, the groove is formed by a saw blade.
  • the problem in the case where the groove portion of the fracture start portion of the metal part is formed with a saw blade can be solved. Specifically, even if the metal part is made by either forging or sintering, when the groove portion is formed using a worn saw blade and then ruptured, a recess is formed at a predetermined interval at the bottom of the groove portion. Thanks to this, a stable fracture surface can be obtained.
  • the method for forming a fracture start part for a metal part according to claim 4 of the present invention is the method for forming a fracture start part for a metal part according to any one of claims 1 to 3,
  • the shape of the opening of the recess is either a circle or an ellipse.
  • the operation of the present invention can be sufficiently exerted if the recessed portions are formed at predetermined intervals on the bottom of the groove.
  • the method for forming a fracture start portion of a metal part according to claim 5 of the present invention is the method for forming a fracture start portion of a metal part according to any one of claims 1 to 3,
  • the shape of the opening of the recess is a 2 (n + 1) square (n is a positive integer), and the alignment direction of one opposing pair of vertices matches the extending direction of the groove. It is a feature.
  • the breakingage of the metal part starts from the top of one opposed pair of the opening and spreads along the extending direction of the groove. There can be no uniform fracture surface.
  • the method for forming a fracture start part of a metal part according to claim 6 of the present invention is the method for forming a fracture start part of a metal part according to any one of claims 1 to 5,
  • the pitch of the recesses is p
  • the length in the longitudinal direction of the opening of the recesses is dm
  • the surplus rate Rt is greater than 0, 1 It is characterized by being less than.
  • the surplus rate Rt is close to 1, so that one dent is formed in the vicinity of both ends of the groove, and the surplus rate Rt. Is close to 0, the recess is formed with a large number of recesses arranged side by side in a slightly spaced state where the longitudinal ends of the opening do not contact each other. In any of these cases, or even when the dents are formed on the bottom of the groove by various arrangements such as the arrangement of the dents in the middle, the effects of the present invention can be exhibited.
  • the first step of preparing the connecting rod in which the metal part is made of a connecting rod and the fracture start portion is not formed, and the large end portion of the connecting rod A second step of forming a break start portion by applying the method for forming a break start portion of a metal part according to any one of claims 1 to 6 at a position opposed to the inner peripheral surface of the inner peripheral surface, and a mandrel
  • a third step of breaking the connecting rod by expanding the inner peripheral surface on which the breaking start portion of the large end portion of the connecting rod is formed.
  • a connecting rod having a uniform fracture surface can be manufactured with much smaller impact energy than in the prior art, and a high-quality connecting rod can be obtained while responding to energy saving requirements.
  • FIG. 3 It is a perspective view of the big end part of the connecting rod which applies the fracture start part formation method of the metal parts concerning the present invention. It is a perspective view which expands partially and shows the fracture
  • a method for forming a fracture start portion of a metal part according to an embodiment of the present invention is a method of forming fracture start portions at positions facing each other in the thickness direction on the inner peripheral surface of a large end portion of a connecting rod of an automobile made of forging. It is.
  • the method for forming a fracture start portion of a metal part includes a first step of forming a groove portion in a portion corresponding to the fracture start portion of a connecting rod that is a metal component, and a plurality of dents in a bottom portion of the groove portion. A second step of forming the portions at a predetermined interval from each other.
  • a broaching blade is set in the broaching device, and in this embodiment, V-shaped grooves are formed by broaching at positions facing each other on the inner peripheral surface of the connecting rod large end.
  • the groove formed by the broaching blade may be a U-shaped groove or a semicircular groove instead of the V-shaped groove as will be described later.
  • a blade for forming a recess is prepared, and a plurality of recesses are formed at predetermined intervals from each other at the bottom of the V-shaped groove using this blade.
  • FIG. 1 is a partial perspective view of a large end portion of a connecting rod to which a method for forming a fracture start portion of a metal part according to the present invention is applied.
  • FIG. 2 is a partially enlarged perspective view showing a fracture start portion of the connecting rod shown in FIG. 3 is a perspective view of the large end portion of the connecting rod shown from a direction different from FIG.
  • FIG. 4 is an enlarged perspective view showing the breaking start portion of the connecting rod shown in FIG. 3 over the entire longitudinal direction of the groove portion.
  • V-shaped grooves 11 that are opposed to each other in the thickness (depth) direction are formed on the inner peripheral surface 10a of the large end portion 10 that is the fracture start portion of the connecting rod 1.
  • the positions of the inner peripheral surfaces 10a of the connecting rod large end portion 10 are opposed to each other in the diametrical direction.
  • a V-shaped groove 11 is formed from one end opening of the connecting rod large end 10 to the other end opening.
  • the depth of the V-shaped groove 11 is 1 mm as an example, and the opening angle is 60 degrees. Note that a broach blade of a broaching machine is used for forming the V-shaped groove 11.
  • a cutting tool for forming a recess is prepared, and using this cutting tool, the opening has a rhombus shape at the bottom of the V-shaped groove 11 and the longitudinal direction thereof is the V-shaped groove 11.
  • a plurality of recesses 12 that match the extending direction are formed at predetermined intervals (see FIGS. 2 and 4).
  • the size of the opening is 0.36 mm in the longitudinal direction, 0.24 mm in the lateral direction, 0.2 mm in depth, and the interval between the recesses is 0.45 mm. It has become.
  • the problem in the case of forming the fracture start portion of the connecting rod consisting only of the V-shaped groove 11 by broaching can be solved.
  • the connecting rod is made of either forging or sintering
  • the V-shaped groove 11 is formed using a worn broach blade and then fractured
  • the recess 12 is formed at the bottom of the V-shaped groove 11. Thanks to the formation of the predetermined interval, a stable fracture surface can be obtained.
  • the groove portion is formed using a broach blade, a uniform fracture surface can be obtained regardless of the degree of wear of the tip of the broach blade, and the groove portion is a U-shaped groove or a semicircle instead of a V-shaped groove. Even in the case of a groove, the present invention can exhibit the same effect.
  • the pitch of the recesses is p
  • the length in the longitudinal direction of the opening of the recesses is dm
  • the surplus ratio Rt is greater than 0 and less than 1.
  • the surplus rate Rt is close to 0.
  • the recesses 12 are formed side by side in a slightly spaced state where the longitudinal ends of the openings do not contact each other.
  • the opening part had the rhombus shape as for the recessed part 13 formed in the bottom part of a V-shaped groove, for example, as shown in FIG.
  • An embodiment in which a plurality of recesses 13 in which the major axis direction of the ellipse coincides with the extending direction of the V-shaped groove is formed at the bottom of the V-shaped groove 11 at a predetermined distance may be used.
  • the opening 14 may be formed in the bottom of the V-shaped groove 11 at a predetermined distance from the bottom of the V-shaped groove.
  • the range of the dent portion dimensions the following dimension ranges are preferable.
  • dm length in the longitudinal direction of the opening of the dent
  • L total length of the groove (including all groove forms such as V groove, U groove, etc.)
  • the dimensional relationship is 0 ⁇ dm ⁇ L / 2.
  • the dimension range in the short direction of the recessed opening where ds is the length in the short direction of the opening of the recessed part and dm is the length in the longitudinal direction of the opening of the recessed part, 0 ⁇ ds ⁇ dm
  • the dimensional relationship is as follows.
  • the depth range of the recess is preferably in a dimensional relationship of 0 ⁇ (depth of the recess) ⁇ 1 mm.
  • the connecting rod breaking device 2 is disposed on a base 100 on which the connecting rod 1 is placed so as to be movable away from each other, and horizontally supports the large end portion 10 and the rod portion of the connecting rod 1.
  • One supporting member 101 and a second supporting member 102, and two mandrel halfs which are suspended from these supporting members 101 and 102 and each outer peripheral surface abuts on and fits into the inner surface of the opening of the connecting rod large end.
  • a halved mandrel 103 comprising parts 103a and 103b is provided.
  • Each of the mandrel halves 103a and 103b abuts against the opposing end surface as a tapered surface, and each of the mandrel halves 103a and 103b is evenly spaced apart and extended, and an actuator 106 that applies a load to the wedge 105
  • a control means (not shown) that applies a pressurized load to the actuator 106 and causes the mandrel halves 103a and 103b to contact the inner surface of the connecting rod opening via the wedge 105, and then instantaneously breaks the opening by applying a breaking load. It has.
  • the connecting rod breaking method using the connecting rod breaking device 2 having such a structure is performed as follows. First, the mandrel 103 is urged in a direction facing each other by a spring, and the mandrel is contracted to enter the opening at the large end of the connecting rod. Then, the wedge 105 is temporarily stopped in a state where the wedge 105 is pushed in until the tapered portion at the tip of the wedge comes into contact with the mandrels 103a and 103b. Breaks instantly by applying expansion force to the fracture start. It should be noted that when the mandrel 103 is urged in a direction facing each other to contract the mandrel, an actuator such as a hydraulic cylinder or an air cylinder may be used instead of the spring.
  • test pieces commonly used in the first to third evaluation tests will be described.
  • the test pieces used in the first to third evaluation tests were based on JIS specifications.
  • the standard number at this time is “JIS Z 2242”, and the standard name is “Charpy impact test method for metal material”.
  • size of the test piece used in the Example is as JIS, the dimension of a groove part differs from what was prescribed
  • the first evaluation test will be described.
  • a break start portion was formed on a test piece by a conventional break start portion forming method using a YAG laser apparatus.
  • the fracture start part was formed in the test piece based on the fracture start part formation method by this invention. And the test piece of these comparative examples and a present Example was actually fractured
  • the test piece was irradiated with a laser beam having an excitation pulse of 200 Hz using a YAG laser apparatus having a maximum peak output of 4.5 kW.
  • a test piece was formed in which recesses having a center interval of adjacent recesses of 0.16 mm and a depth of 0.6 mm were continuously formed.
  • a V-shaped groove in which the bottom portion in the above-described embodiment is R 0.2 mm and the opening angle of the V-shaped groove (the angle formed by the inclined surfaces facing the V-shaped grooves) is 60 degrees. It is broached (machined) and manufactured as a test piece, and the opening shape is an ellipse using a cutting tool for forming a recess at the bottom of the V-shaped groove of the connecting rod.
  • a test piece having a break start portion with a predetermined interval between the recessed portions matching the extending direction was used as a test piece for this example.
  • size of the opening part of a dent part is 0.27 mm in a longitudinal direction, 0.19 mm in a transversal direction, a depth is 0.2 mm, and the space
  • FIG. 8 is a photomicrograph showing the structure of the fracture surface when the test piece having the fracture start portion formed by the comparative example of the first evaluation test was fractured using a Charpy impact tester.
  • FIG. 9 is a photomicrograph showing the structure of a test piece having a fracture start portion formed according to the present example of the first evaluation test when it was fractured using a Charpy impact tester. As is clear from the structural charts showing both of these fracture surfaces, it was found that the present embodiment can obtain a fracture surface that is as stable as the comparative example.
  • the second evaluation test a test piece in which only a V-shaped groove was simply formed by broaching was used as a comparative example of the second evaluation test.
  • this example of the second evaluation test was constituted by three examples of Example A, Example B, and Example C. Specifically, a V-groove is formed on the test piece made by forging by broaching, and a test piece is formed on the bottom of the V-shaped groove using a recess forming blade at a predetermined interval. Three examples of 2 evaluation tests were used.
  • the dent part which an opening part has circular shape as Example A was formed at predetermined intervals.
  • the size of the opening of the recess was 0.19 mm in diameter, 0.2 mm in depth, and the interval between the recesses was 0.24 mm.
  • Example B recesses whose opening shape was an ellipse and whose major axis direction coincided with the extending direction of the V-shaped groove were formed at predetermined intervals.
  • the size of the opening part of the dent part was 0.21 mm for the major axis diameter, 0.19 mm for the minor axis diameter, 0.2 mm for the depth, and the interval between the dent parts was 0.265 mm.
  • Example C recesses whose opening shape was an ellipse and whose major axis direction coincided with the extending direction of the V-shaped groove were formed at predetermined intervals.
  • the major axis diameter was 0.27 mm
  • the minor axis diameter was 0.19 mm
  • the depth was 0.2 mm
  • the spacing between the recesses was 0.34 mm.
  • the test piece according to the comparative example of the second evaluation test and the examples A to C is broken through the Charpy impact tester, the absorbed energy corresponding to the size of R at the bottom of the V-shaped groove is measured. And graphed.
  • FIG. 10 is a characteristic diagram showing the absorbed energy at the time of breakage using the comparative example in the example of the present invention and the Charpy tester of this example.
  • Example A circular recess shape (diameter 0.19 mm)
  • Example B elliptical recess shape (major axis diameter 0.21 mm)
  • Example C elliptical recess shape (Major axis diameter 0.27 mm).
  • R The radius of the bottom of the V groove (nose R).
  • the horizontal axis in FIG. 10 represents the difference in Charpy impact value between each example and the comparative example. From the left, the tests of Comparative Example X, Example A, Example B, and Example C in this example are performed. Results were shown.
  • the vertical axis indicates the Charpy impact value SP1 of these comparative examples and each example in the unit kJ / m 2 .
  • the average Charpy impact value is 89 kJ / m 2 , both of which have a significantly smaller Charpy impact value than the comparative example, and the wear before and at the tip of the broach blade. It was also found that the difference in Charpy impact value later was small.
  • the average value of the Charpy impact value is 80 kJ / m 2 , both of which have a significantly smaller Charpy impact value than the comparative example, and the wear before and at the wear of the broach blade tip. It was also found that the difference in Charpy impact value later was small.
  • the method for forming a fracture start portion of a metal part according to the present invention it has been found that the problem of forming a fracture start portion of a metal part consisting only of a V-shaped groove by broaching can be solved. Specifically, even if the metal part is made by either forging or sintering, when a V-shaped groove is formed using a worn broach blade and then ruptured, a concave portion is provided at the bottom of the V-shaped groove. It was found that a stable fracture surface was obtained thanks to the formation of the gap.
  • the third evaluation test will be described.
  • two comparative examples (Comparative Example P and Comparative Example Q) were prepared using a saw blade (cutting saw) as described in Japanese Patent Application Laid-Open No. 2008-36706.
  • the energy required to break the comparative example with a Charpy tester was measured.
  • a circular recess having a depth of 0.2 mm and an opening diameter of 0.19 mm was directly formed on the test piece described above as Comparative Example P without forming a V-shaped groove.
  • the surplus ratio corresponding to each pitch was obtained as four different pitches, and each Charpy impact value was measured.
  • Comparative Example Q four types of openings were formed at predetermined intervals at four different pitches with the recesses having an elliptical opening.
  • the major axis diameter of the opening of the recess was 0.27 mm and the minor axis diameter was 0.19 mm.
  • the surplus ratio corresponding to each pitch was calculated
  • FIG. 11 shows the absorbed energy required when the test pieces of these comparative examples and this example were broken by a Charpy tester.
  • the horizontal axis in FIG. 11 represents the surplus ratio Rt, and the vertical axis represents the Charpy impact value SP2 in the unit kJ / m 2 .
  • the black square plot indicates an oval dent row, and the black rhombus plot indicates a circular dent row.
  • an elliptical cross-section dent row major axis diameter 0.27 mm / minor axis diameter 0.19 mm, which corresponds to Comparative Example Q described above.
  • the test piece in the third evaluation test has a considerably large Charpy impact value necessary for breaking the test piece, which is about 5 times the Charpy impact value in the present embodiment of the second evaluation test. I found out that it has doubled. From the fact of this evaluation test, in order to obtain two fracture surfaces with the same Charpy impact value as in this example of the second evaluation test in the test piece of the comparative example of the third evaluation test, It is thought that it is necessary to make it more than 5 times deeper than the current situation.
  • the broaching machine was used when machining the V-shaped groove described above, but the groove may be formed by electric discharge machining instead.
  • the V-shaped groove is formed in the first step.
  • the groove part formed facing the inner peripheral surface of the connecting rod large end part was a V-shaped groove with an opening angle of 60 degrees.
  • the present invention is not limited to this, and if the opening angle is not an obtuse angle, any opening angle such as 90 degrees, 45 degrees, or other angles can be selected from the viewpoint of material dynamics.
  • the shape of the groove is not particularly limited, and may be a U-shaped groove or a semicircular groove instead of the V-shaped groove.
  • the present invention has been described with respect to a method for forming a fracture start portion of a connecting rod of an automobile
  • the method of forming a fracture start portion of the present invention is not limited to a connecting rod of an automobile.
  • parts such as bearings and half spacers, which are divided into two parts from a specific broken part to make a half part and the broken surface of the half part is brought into contact again. is there.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Forging (AREA)
PCT/JP2010/060487 2009-06-22 2010-06-21 金属製部品の破断開始部形成方法 WO2010150753A1 (ja)

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KR1020117022843A KR101775168B1 (ko) 2009-06-22 2010-06-21 금속제 부품의 파단 개시부 형성 방법
CN2010800215272A CN102427911A (zh) 2009-06-22 2010-06-21 金属制部件的断裂开始部形成方法

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JP2009147861A JP5340822B2 (ja) 2009-06-22 2009-06-22 金属製部品の破断開始部形成方法

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JP2012142229A (ja) 2011-01-05 2012-07-26 Yazaki Corp スイッチ装置
JP2014142004A (ja) * 2013-01-23 2014-08-07 Univ Of Hyogo アルミ合金ダイカスト製分割型コンロッドの加工方法
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