WO2006057259A1 - コネクティングロッド用クラッキング溝の加工方法及び装置 - Google Patents
コネクティングロッド用クラッキング溝の加工方法及び装置 Download PDFInfo
- Publication number
- WO2006057259A1 WO2006057259A1 PCT/JP2005/021488 JP2005021488W WO2006057259A1 WO 2006057259 A1 WO2006057259 A1 WO 2006057259A1 JP 2005021488 W JP2005021488 W JP 2005021488W WO 2006057259 A1 WO2006057259 A1 WO 2006057259A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- groove
- connecting rod
- large end
- cracking
- end hole
- Prior art date
Links
Classifications
-
- 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
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/28—Grooving workpieces
- B23C3/30—Milling straight grooves, e.g. keyways
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
- B23D45/003—Sawing machines or sawing devices with circular saw blades or with friction saw discs for particular purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
- B23D47/12—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts of drives for circular saw blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2215/00—Details of workpieces
- B23C2215/24—Components of internal combustion engines
- B23C2215/245—Connecting rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2270/00—Details of milling machines, milling processes or milling tools not otherwise provided for
- B23C2270/18—Milling internal areas of components
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/49288—Connecting rod making
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T409/00—Gear cutting, milling, or planing
- Y10T409/30—Milling
- Y10T409/309576—Machine frame
Definitions
- the connecting rod for example, after a connecting rod constituting an engine for a vehicle is integrally formed, the connecting rod is connected to a cap portion and a rod portion on the inner peripheral surface of a large end hole of the connecting rod.
- the present invention relates to a method and apparatus for processing a cracking groove for a connecting rod that forms a cracking groove for breaking and separating.
- a crankshaft of a vehicle engine and a piston are connected via a connecting rod (hereinafter simply referred to as a connecting rod), and the rotational driving force of the crankshaft is transmitted to the piston.
- a connecting rod hereinafter simply referred to as a connecting rod
- This connecting rod has a bearing mounted on the inner peripheral surface of a large end hole formed at the large end portion on one end portion side thereof, and supports the journal of the crankshaft and also has a small end on the other end portion side.
- a piston pin that is inserted into the piston through a separate bearing is inserted into the small end hole formed in the part.
- the connecting rod is formed by forging, and a shaft portion (rod portion) and a cap portion, each of which is a connecting rod main body, are separately manufactured in advance, and the connecting rod is integrated.
- a manufacturing method of cracking of a connecting rod which is separated into the shaft portion (rod portion) and the cap portion after being manufactured.
- a broaching blade is formed along the axial direction on the outer peripheral surface of the jig, and the jig is inserted into the large end hole of the connecting rod so as to be formed on the inner peripheral surface of the large end hole. Displace the broach blade while touching it. This allows the broach along the axial direction to the inner peripheral surface of the large end hole.
- a groove is formed (see, for example, Japanese Patent No. 3012510).
- the shaft portion and the cap portion are equally and smoothly broken and separated. Therefore, the positions and depths of the grooves for promoting fracture formed on the inner peripheral surface of the large end hole are substantially equal, in other words, the pair of grooves formed in the large end hole are: They are required to be formed symmetrically with each other.
- the broaching blade of a jig used for broaching has a substantially V-shaped cross section.
- the shape of the groove formed is substantially V-shaped.
- the inner peripheral surface of the large end hole of the connecting rod is intermittently cut by the plurality of tips, so that the tops of the cutting edges of the plurality of tips are worn.
- a general object of the present invention is to process a connecting groove cracking groove capable of reliably and inexpensively forming a pair of cracking grooves on the inner peripheral surface of the large end hole of the connecting rod. To provide an apparatus.
- a main object of the present invention is to provide a connecting rod capable of forming a pair of cracking grooves having a groove shape force optimized for promoting fracture on the inner peripheral surface of a large end hole of the connecting rod. It is to provide a method of processing a cracking groove for a machine.
- FIG. 1 An apparatus for processing a cracking groove for a connecting rod according to an embodiment of the present invention. It is a principal part perspective view.
- FIG. 2 is a longitudinal sectional view of the processing apparatus of FIG.
- FIG. 3 is a partial cross-sectional exploded perspective view showing a state in which a metal saw, a spacer, and a tightening nut are detached from a spindle in the groove cover portion of FIG.
- FIG. 4 is a longitudinal sectional view of the processing apparatus of FIG.
- FIG. 5 is a cross-sectional view of a groove processing portion of the processing apparatus of FIG.
- FIG. 6 is a partially omitted longitudinal sectional view showing a state in which the groove processing portion is inserted into the large end hole of the connecting rod and the first groove is processed on one side of the inner peripheral surface of the large end hole. is there.
- FIG. 7 is a partially omitted longitudinal sectional view showing a state in which the groove processing portion shown in FIG. 6 is displaced downward through the large end hole after forming the first groove in the large end hole.
- FIG. 9 is a partially enlarged plan view of the vicinity of the first groove or the second groove formed by the groove processing portion of the processing apparatus of FIG.
- FIG. 10A is a perspective view of a connecting rod in which a first groove and a second groove are formed
- FIG. 10B is a perspective view showing a state in which the connecting rod is broken and separated into a cap portion and a rod portion.
- FIG. 11A is a diagram showing the relationship between the inclination angle between a pair of tapered surfaces in a cracking groove and the breaking separation property of a connecting rod that is broken and separated by the cracking groove.
- FIG. 4 is a diagram showing the relationship between the radius of curvature of an arc portion in a cracking groove and the breaking separation property of a connecting rod that is broken and separated by the cracking groove.
- FIG. 12 is a partially omitted plan view of a metal saw for cutting a cracking groove.
- FIG. 13 is a partially enlarged plan view of the metal saw shown in FIG.
- FIG. 14 A partially enlarged plan view showing a modification of the first groove or the second groove formed by the processing apparatus of FIG.
- reference numeral 10 denotes a connecting port according to the embodiment of the present invention.
- a processing device for cracking grooves for a lid (hereinafter simply referred to as processing device 10) is shown.
- the processing apparatus 10 includes a body 14 connected to an end of an industrial articulated robot 12 (for example, a numerical control machine) via a bolt (not shown), and the body 14.
- a drive unit 16 provided with a rotation drive source (described later) that is driven and controlled by a control signal (electric signal) output from a driver (not shown), and a lower end of the body 14 are connected to a connecting rod 18 (
- the groove processing portion 24 for forming a cracking groove 22 see FIG. 5) on the inner peripheral surface of the large end hole 20 of the connecting rod 18
- a driving force transmission mechanism 26 for transmitting the
- a mounting table 28 on which the connecting rod 18 is mounted is disposed below the processing apparatus 10.
- the additive device 10 integrally connected to the robot 12 can be moved to any position including the three axes of XYZ and can be set to any orientation. It is.
- an opening 30 is formed at a position facing a driving pulley 72 (described later) disposed in the substantially central portion of the body 14. ing. Since the opening 30 formed in a substantially circular shape is formed larger than the diameter of the drive pulley 72, the drive pulley 72 can be taken out through the opening 30.
- a support portion 32 (see FIG. 4) that rotatably holds the groove processing portion 24 is provided on the lower surface of the body 14 so as to protrude.
- the grooving section 24 includes a spindle (rotating shaft) 34 that is rotatably held by the support section 32 and a spindle 34 that is passed through the spindle 34. And a spacer 38 for sandwiching the metal saw 36 with the spindle 34.
- the spindle 34 includes a shaft portion 44 rotatably held by first and second bearings 40 and 42 disposed inside the support portion 32, and the shaft portion.
- the flange portion 46 has a diameter that is larger than 44 in the radially outward direction, and a holding portion 48 that has a diameter smaller than that of the flange portion 46 and holds the metal saw 36.
- a driven pulley 74 (to be described later) of the driving force transmission mechanism 26 is provided at the end of the shaft portion 44. It is integrally connected via a bolt 50.
- a key portion 52 having a substantially rectangular cross section is mounted on the flange portion 46 via a mounting groove.
- the key portion 52 is provided so as to protrude from the end surface of the flange portion 46 toward the holding portion 48 by a predetermined length, and to protrude radially outward from the outer peripheral surface of the holding portion 48.
- the metal saw 36 is formed in a thin disk shape from, for example, a metal material, and a plurality of blade portions 54 that also have a wave-like force are continuously provided on the outer periphery of the metal saw 36 at regular intervals. ing.
- a milling cutter (not shown) may be used.
- the cross-sectional shape of the blade portion 54 in the metal saw 36 is formed in an acute angle shape that tapers outwardly in the radial direction, and the tip thereof has a predetermined radius.
- An arcuate R portion 56 is formed. As described above, by using the metal saw 36 for the groove force portion 24 for processing the cracking groove 22, the radius of curvature of the R portion 56 can be reduced.
- the outer diameter of the metal saw 36 is formed larger than the outer diameter of the flange portion 46 and the spacer 38 of the spindle 34, and as shown in FIG. It is formed to be smaller than the diameter B of the large end hole 20 of the connecting rod 18 (A
- a through hole 58 that is inserted along the outer peripheral surface of the holding portion 48 of the spindle 34 is formed in a substantially central portion of the metal saw 36.
- the key portion 52 of the spindle 34 and the key groove portion 62 of the metal saw 36 are engaged with each other. Relative rotational displacement relative to 36 is regulated.
- the key groove portion 62 of the metal saw 36 is engaged with the key portion 52 of the spindle 34, the key portion 52 functions as a detent of the metal saw 36 with respect to the spindle 34, and when the spindle 34 is driven to rotate. The metal saw 36 is driven to rotate.
- a ring-shaped spacer 38 is inserted into the holding portion 48.
- the spacer 38 is passed through the holding portion 48 of the spindle 34 through a hole 38a formed in a substantially central portion.
- a fastening portion 64 protruding in a direction away from the flange portion 46 is provided on an end surface of the holding portion 48, and a fastening portion 64 having a screw engraved on the outer peripheral surface is provided with a washer 65.
- the tightening nut 66 is screwed together. That is, by tightening the tightening nut 66 and screwing the tightening nut 66 toward the spacer 38 side, the end surface of the tightening nut 66 is connected to the spacer 38 force metal saw through the washer 65.
- the metal saw 36 is pressed to the side 36 and fixed in a state of being sandwiched between the spacer 38 and the flange portion 46 of the spindle 34.
- the metal saw 36 and the spacer 38 are integrally fixed to the spindle 34, and rotate integrally under the rotational drive action of the spindle 34.
- the drive unit 16 includes a rotation drive source 68 (for example, a motor) connected to a substantially central portion of the body 14, and the drive shaft 70 is rotated counterclockwise by an electric signal (not shown) and an electric signal supplied from the driver. Drive in the direction of arrow C1 in Fig. 2).
- a rotation drive source 68 for example, a motor
- the drive shaft 70 is rotated counterclockwise by an electric signal (not shown) and an electric signal supplied from the driver. Drive in the direction of arrow C1 in Fig. 2).
- the rotational drive source 68 is connected to a side surface facing the opening 30 of the body 14, and the drive shaft 70 is inserted into the body 14.
- the drive force transmission mechanism 26 includes a drive pulley 72 attached to the drive shaft 70 of the rotational drive source 68, a driven pulley 74 integrally connected to the groove processing portion 24, and the drive pulley 72.
- the driving force transmission belt 76 is suspended between the driven pulley 74 and has a timing belt equal force, for example.
- the drive pulley 72 is integrally attached to the drive shaft 70 via a connection nut 78 inside the body 14 and rotates integrally under the drive action of the rotary drive source 68.
- the driven pulley 74 is provided on the side of the support portion 32 and is connected to the shaft portion 44 of the spindle 34 held by the support portion 32.
- the driving force transmission belt 76 is suspended between the driving pulley 72 and the driven pulley 74 and is disposed so as to pass through the inside of the body 14.
- a plurality of parallel teeth 80 spaced apart from each other by a predetermined distance are formed on the inner peripheral surface of the driving force transmission belt 76, and the parallel teeth 80 mesh with the driving pulley 72 and the driven pulley 74, thereby driving.
- the power transmission belt 76 goes around. Then, the driving force of the driving pulley 72 is transmitted to the driven pulley 74 via the driving force transmission belt 76 under the rotary driving operation of the driving shaft 70 in the rotary driving source 68, and the groove processing is integrally performed with the driven pulley 74. Part 24 rotates.
- the mounting table 28 disposed below the processing apparatus 10 is installed on a floor surface (not shown) or the like, and its upper surface is formed substantially horizontally.
- the connecting rod 18 is placed so that its axis D (see FIG. 2) and the upper surface are substantially parallel, and the central portion is integrally formed through a fixing member 82 (see FIG. 1). It is fixed.
- the connecting rod 18 includes a large end portion 84 formed wide on one end side and a small end portion 86 formed narrow on the other end side.
- the large end portion 84 is formed with a large end hole 20 through which the journal of the crankshaft is not shown.
- the drive force transmission mechanism 26 described above is not limited to the case where the drive force transmission belt 76, the drive pulley 72, and the driven pulley 74 are configured.
- a first gear (not shown) having a plurality of gear teeth is provided, and a second gear (not shown) having a plurality of gear teeth is provided at the end of the spindle 34, and the first gear and the second gear are provided.
- a chain may be suspended between the gear 34 and the spindle 34 to rotate.
- the connecting rod cracking groove processing apparatus 10 is basically configured as described above. Next, its operation and effects will be described. As shown in FIG. 1, the connecting rod 18 in which the cracking groove 22 is formed is fixed to the upper surface of the mounting table 28 via the fixing member 82, and the processing device 10 is in a standby state above the connecting rod 18. This will be described as the initial position.
- a first groove 88 and a second groove 90 which are a pair of cracking grooves 22 formed respectively, are formed.
- the small end 86 of the connecting rod 18 is placed on the lower side on the upper surface of the mounting table 28, and the large end 84 is
- the processing apparatus 10 that has been waiting above the connecting rod 18 is Under the control action of g. 12, the groove force web 24 is moved so as to be positioned above the large end hole 20 of the connecting rod 18.
- the center of the groove force portion 24 is offset to the left of the axis D of the connecting rod 18, and the outer peripheral surface force of the metal saw 36 of the groove force portion 24 is radially outward from the inner peripheral diameter of the large end hole 20. Is moved so as to overlap by a predetermined overlap amount F1 (see Fig. 5).
- the overlap amount F1 overlapped in the radially outward direction with respect to the large end hole 20 of the connecting rod 18 is equal to the first groove 88 formed by the metal saw 36 of the groove force portion 24.
- the groove force portion 24 integrally connected to the driven pulley 74 rotates counterclockwise (in the direction of arrow C 2) around the support bolt 50.
- the groove processing portion 24 is gradually inserted into the large end hole 20 (see FIG. 6).
- the outer circumferential diameter of the metal saw 36 of the groove processing portion 24 overlaps the inner peripheral surface of the large end hole 20 of the large end hole 20 by a predetermined amount F1 in the radial outward direction, the rotation of the groove processing portion 24 is performed.
- the metal saw 36 contacts the inner peripheral surface of the large end hole 20 and is displaced downward while cutting. Specifically, the outer peripheral portion of the metal saw 36 is gradually displaced downward while cutting the inner peripheral surface of the large end portion 84 (see FIG. 7).
- the metal saw 36 rotates and is displaced substantially vertically downward (in the direction of the arrow XI) with respect to the upper surface of the mounting table 28, and has a substantially uniform depth on the inner peripheral surface of the large end hole 20 of the connecting rod 18.
- a first groove 88 having a thickness is formed.
- the first groove 88 functions as one of the pair of cracking grooves 22 and is formed in a straight line in a direction substantially orthogonal to the axis D of the connecting rod 18, and the groove shape is a metal saw that also has an acute cross-sectional shape force. Are formed in a substantially V-shaped cross section (see FIG. 9).
- the groove processed portion 24 is formed in the clearance formed in the substantially central portion of the large end hole 20 and the mounting table 28.
- the inside of the hole 92 is inserted to be positioned below the connecting rod 18 (see FIG. 7). Since the diameter of the escape hole 92 is larger than the diameter of the large end hole 20, the metal saw 36 may come into contact when the grooved portion 24 is inserted into the escape hole 92. Absent.
- the groove processing portion 24 is in a state of rotating counterclockwise (in the direction of the arrow C2) under the driving action of the rotation driving source 68.
- a second groove 90 is formed at a position symmetrical to the first groove 88 with respect to (see FIG. 5).
- the overlap amount F2 overlapped in the radially outward direction with respect to the large end hole 20 of the connecting rod 18 is the depth H2 of the second groove 90 formed by the metal saw 36 (FIG. 8).
- the overlap amount F2 is set to a value (F1 F2) substantially equal to the overlap amount F1 between the left side surface of the large end hole 20 and the metal saw 36 when the first groove 88 is formed.
- the depth of the first groove 88 and the second groove 90 in the large end hole 20 can be made substantially uniform (HI).
- the first groove 88 is formed to connect the connecting rod 1
- the processing device 10 is moved only in a substantially horizontal direction (arrow Y direction).
- the grooved portion 24 is displaced along the base line E (see FIG. 5) in the large end hole 20, it is added to a position facing the first groove 88 with respect to the axis D of the connecting rod 18.
- the device 10 has moved.
- the processing device 10 is gradually moved vertically upward (arrow) under the control action of the robot 12.
- the grooved portion 24 is gradually inserted from below the large end hole 20 into the inside.
- the metal saw 36 contacts the inner peripheral surface of the large end hole 20 under the rotating action of the groove processing portion 24 and is displaced upward while cutting.
- the outer peripheral portion of the metal saw 36 is gradually displaced upwardly while scraping the inner peripheral surface of the large end portion 84 (see FIG. 8).
- the metal saw 36 is displaced in a substantially vertical upward direction (arrow X2 direction) while rotating, and the first groove 88 has a substantially uniform depth on the inner peripheral surface of the large end hole 20 of the connecting rod 18.
- Two grooves 90 are formed.
- the second groove 90 is formed at a position symmetrical to the first groove 88 and the axis D of the connecting rod 18 on the inner peripheral surface of the large end hole 20.
- the second groove 90 functions as the other of the pair of cracking grooves 22, and has a substantially uniform depth with the first groove 88 (see FIG. 8).
- the grooves are formed in a straight line in a substantially orthogonal direction, and the groove shape is formed in a substantially V-shaped cross section by the blade portion 54 of the metal saw 36 having an acute cross-sectional shape force (see FIG. 9).
- the groove shape of the cracking groove 22 is such that the portion that is opened along the inner peripheral surface of the large end hole 20 is directed toward the radially outward direction of the large end hole 20.
- a set of linear portions 93 extending substantially in parallel with each other for a predetermined length, a set of tapered surfaces 94a, 94b that are continuous with the linear portions 93 and inclined at a predetermined angle in a direction approaching each other, and the tapered surfaces 94a, 94b
- the arc portion 96 is formed so as to connect the intersecting portions.
- the pair of tapered surfaces 94 a and 94 b are formed so as to be inclined by substantially the same angle with respect to the center line of the cracking groove 22. Note that, as shown in FIG. 14, the radius of the large end hole 20 from the portion opened along the inner peripheral surface of the large end hole 20 without having the linear portion 93. A pair of tapered surfaces 94a and 94b that are inclined by a predetermined angle in a direction approaching each other by applying an outward force may be directly formed.
- the above-described groove shape of the cracking groove 22 is formed such that the width dimension W (see FIG. 9) of the opened portion of the cracking groove 22 is based on the thickness dimension of the blade portion 54 in the metal saw 36.
- the radius of curvature R (see FIG. 9) of the arc portion 96 is formed based on the radius of curvature of the R portion 56 of the blade portion 54.
- the depth of the groove can be set large, cutting resistance can be suppressed, and stress can be concentrated during cracking. Can be made.
- the width dimension W of the portion opened along the inner peripheral surface of the large end hole 20 is set to 0.05.
- ⁇ It is formed to be within the range of Lmm (0.05 05 ⁇ W ⁇ 1), and the groove depths H1 and H2 from the open part to the arc part 96 are within the range of 0.1 to 2 mm ( 0. 1 ⁇ H1, H2 ⁇ 2).
- width dimension W is greater than lmm (W> 1), sufficient stress required to separate the connecting rod 18 from the cracking groove 22 may be concentrated. However, the breaking separation property of the connecting rod 18 starting from the cracking groove 22 is deteriorated. On the contrary, when the width dimension W is less than 0.05 mm (W ⁇ 0.05), the inner peripheral surface of the large end hole 20 is finished in the cracking groove 22. This is because the generated burrs and the like enter and it is difficult to remove the burrs.
- the groove depths Hl and H2 are less than 0.1 mm (Hl, H2 ⁇ 0.1)
- the surface roughness of the fractured surface when the connecting rod 18 is separated by fracture is large ( It becomes difficult to re-integrate the rod part 20a and the cap part 20b which have been separated by breakage.
- the groove depths Hl and H2 cannot exceed 2 mm (Hl, H2> 2) due to manufacturing restrictions of the connecting rod 18.
- the inclination angle S (see Fig. 9) set by the separation angle between one tapered surface 94a and the other tapered surface 94b is in the range of 20 to 45 ° (20 ° ⁇ S ⁇ 45 ° ) So that the radius of curvature R of the arc portion 96 is 0.4 mm or less (R ⁇ 0.4).
- the width dimension W of the groove extending in a direction parallel to the radial outward direction from the portion where the large end hole 20 is opened is set in the range of 0.05 to lmm, and is substantially parallel. Is set so that the inclination angle S between a pair of tapered surfaces inclined so as to approach each other from the part extending radially outward is within a range of 20 to 45 °, and Groove depths Hl and H2 from the end hole 20 are set in a range of 0.1 to 2 mm, and the radius of curvature R of the arc part 96 formed so as to straddle the pair of tapered surfaces 94a and 94b. Is set to 0.4 mm or less, the optimal cracking groove 22 for promoting fracture can be obtained.
- the groove processing portion 24 that forms the first groove 88 and the second groove 90 on the inner peripheral surface of the large end hole 20 of the connecting rod 18 is used to rotate the rotary drive source 68. Under the action, it is rotated via the driving force transmission belt 76. Then, the metal saw 36 of the groove force feeding portion 24 is inserted into the inner peripheral surface of the large end hole 20 of the rod 18, and the cross-section for accelerating breakage optimal for the inner peripheral surface by the blade portion 54 of the metal saw 36. A pair of the first groove 88 and the second groove 90 that become the V-shaped cracking groove 22 can be formed.
- a breaking separation jig (not shown) is inserted into the large end hole 20 of the connecting rod 18 in which the first groove 88 and the second groove 90 are formed, and the inner peripheral surface of the large end hole 20 is inserted.
- the connecting rod 18 can be reliably controlled with the first groove 88 and the second groove 90 as the starting point of breakage, and the rod part 20a and the cap part 20b can be reliably controlled.
- it can be broken and separated with high accuracy (see FIG. 10B).
- the connecting rod 18 can be reliably and highly accurately separated from the cracking groove 22 by the fracture separating jig with a smaller pressure than in the past.
- the movement position of the cache apparatus 10 can be programmed and controlled with high accuracy.
- the position and depth of the first groove 88 and the second groove 90 in the large end hole 20 can be formed simply and with high accuracy.
- the first groove 88 and the second groove 90 can be formed at symmetrical positions and substantially uniform depths with respect to the axis D of the connecting rod 18 in the large end hole 20.
- a metal saw 3 6 is provided in order to form a cracking groove 22 in the large end hole 20 in order to form a cracking groove 22 in the large end hole 20 .
- the metal saw 36 in the groove force feeding portion 24 in this way, the R portion 56 formed at the distal end portion of the blade portion 54 of the metal saw 36 can be formed small.
- the arc portion 96 of the cracking groove 22 cut by the R portion 56 of the blade portion 54 can be formed to be small, and accordingly, the breaking separability of the connecting rod 18 separated from the cracking groove 22 as a starting point. Can be improved.
- the metal saw 36 has a plurality of blade portions 54 (for example, the number of blades of 78) at the outer peripheral edge portion, etc., with a chip discharge gap 53 therebetween. It is optimal to use equiangular milling cutters that are spaced apart from each other. When the blade portion 54 comes into contact with the inner peripheral surface of the large end hole 20 and cuts the blade portion 54 with respect to the inner peripheral surface. Can contact continuously.
- the impact, vibration, etc. applied to the spindle 34 can be reduced.
- the durability of the first and second bearings 40 and 42 supporting the pindle 34 can be improved.
- the radius of curvature R of the arc portion 96 of the cracking groove 22 can be set small.
- the number of teeth of the equiangular milling cutter may be set so as to satisfy the relationship of AZ10 ⁇ number of teeth ⁇ 2A, where A is the outer diameter (maximum outer diameter) of the equiangular milling including the cutting edge. .
- AZ10 indicates the limit at which the blade part (cutting edge) continuously contacts
- 2A indicates the general manufacturing limit as an equiangular milling cutter.
- the equipment cost can be reduced as compared with the case where grooves are formed in the large end hole 20 by conventional broaching or laser processing.
- the optimal cracking groove 22 for accelerating rupture by forming the optimal cracking groove 22 for accelerating rupture, it is possible to reduce the rupture load when the rupture is divided into the cap portion 20b and the rod portion 20a.
- the breaking force having the optimum fracture surface can be performed with both the bending force and the optimum site force. Therefore, the temporary recombination of the cap part 20b and the rod part 20a, which are broken and divided in the subsequent process, can be performed reliably.
- the cracking groove 22 by forming the cracking groove 22 using the metal saw 36, it is possible to cope with an inexpensive processing facility, and the processing groove shape is processed to the same level as the laser processing. You can. As a result, in the present embodiment, the groove shape of the cracking groove 22 can be controlled with high accuracy, and the optimum groove shape for accelerating rupture can be easily obtained.
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/662,609 US20070256300A1 (en) | 2004-11-25 | 2005-11-22 | Method and Device for Machining Cracking Groove for Connecting Rod |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004341271A JP2006150472A (ja) | 2004-11-25 | 2004-11-25 | コネクティングロッド用クラッキング溝の加工装置 |
JP2004341272A JP2006150473A (ja) | 2004-11-25 | 2004-11-25 | コネクティングロッド用クラッキング溝の加工方法 |
JP2004-341271 | 2004-11-25 | ||
JP2004-341272 | 2004-11-25 |
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WO2006057259A1 true WO2006057259A1 (ja) | 2006-06-01 |
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PCT/JP2005/021488 WO2006057259A1 (ja) | 2004-11-25 | 2005-11-22 | コネクティングロッド用クラッキング溝の加工方法及び装置 |
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Cited By (1)
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WO2014185348A1 (ja) * | 2013-05-14 | 2014-11-20 | 株式会社安永 | コンロッドの破断開始部形成方法及び形成装置 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US7596994B2 (en) * | 2004-11-09 | 2009-10-06 | Honda Motor Co., Ltd. | Device and method for inspecting connecting rod |
US8298479B2 (en) * | 2008-06-24 | 2012-10-30 | Gerald Martino | Machined titanium connecting rod and process |
JP5340822B2 (ja) * | 2009-06-22 | 2013-11-13 | 株式会社安永 | 金属製部品の破断開始部形成方法 |
CN109715329B (zh) * | 2016-09-30 | 2020-11-20 | 工机控股株式会社 | 切断工具 |
CN108890006A (zh) * | 2018-09-05 | 2018-11-27 | 张家港市纳德轴承有限公司 | 多工位连续加工的轴承内圈端面开槽装置及其开槽机构 |
CN109026977A (zh) * | 2018-09-27 | 2018-12-18 | 西安爱生技术集团公司 | 一种小型航空活塞发动机涨断式连杆 |
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JPH05261626A (ja) * | 1992-03-18 | 1993-10-12 | Mazda Motor Corp | コネクチングロッドの製造方法およびその装置 |
JPH0771438A (ja) * | 1993-09-01 | 1995-03-17 | Sumitomo Electric Ind Ltd | 軸挟持部材およびその製造方法 |
JPH09201641A (ja) * | 1996-01-25 | 1997-08-05 | Gooshiyuu:Kk | 鍛造コンロッドにおけるコンロッドキャップの分割方法及びその装置 |
JPH10263911A (ja) * | 1997-03-25 | 1998-10-06 | Hitachi Ltd | 深溝加工用カッター |
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JP2005106271A (ja) * | 2002-12-26 | 2005-04-21 | Yamaha Motor Co Ltd | 分割型コンロッド |
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US5566449A (en) * | 1993-08-19 | 1996-10-22 | Sumitomo Electric Industries, Ltd. | Process for producing a shaft clamping member |
US7418886B2 (en) * | 2002-12-26 | 2008-09-02 | Yamaha Hatsudoki Kabushiki Kaisha | Split type connecting rod |
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- 2005-11-22 US US11/662,609 patent/US20070256300A1/en not_active Abandoned
- 2005-11-22 WO PCT/JP2005/021488 patent/WO2006057259A1/ja active Application Filing
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JPS637210A (ja) * | 1986-06-28 | 1988-01-13 | Nippon Chikasui Kaihatsu Kk | ストレーナー管スリット加工方法、及びその装置 |
JPH05261626A (ja) * | 1992-03-18 | 1993-10-12 | Mazda Motor Corp | コネクチングロッドの製造方法およびその装置 |
JPH0771438A (ja) * | 1993-09-01 | 1995-03-17 | Sumitomo Electric Ind Ltd | 軸挟持部材およびその製造方法 |
JPH09201641A (ja) * | 1996-01-25 | 1997-08-05 | Gooshiyuu:Kk | 鍛造コンロッドにおけるコンロッドキャップの分割方法及びその装置 |
JPH10263911A (ja) * | 1997-03-25 | 1998-10-06 | Hitachi Ltd | 深溝加工用カッター |
JP2000005918A (ja) * | 1998-06-17 | 2000-01-11 | Hakken Seikoo:Kk | 溝形成装置 |
JP2005106271A (ja) * | 2002-12-26 | 2005-04-21 | Yamaha Motor Co Ltd | 分割型コンロッド |
JP2005034952A (ja) * | 2003-07-15 | 2005-02-10 | Honda Motor Co Ltd | コネクティングロッド用クラッキング溝の加工装置 |
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WO2014185348A1 (ja) * | 2013-05-14 | 2014-11-20 | 株式会社安永 | コンロッドの破断開始部形成方法及び形成装置 |
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