JP2006142467A - Device for dividing connecting rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for dividing a connecting rod which is capable of reducing a time lag between pre-rupture and post-rupture to the utmost. <P>SOLUTION: The device has a fixed stage 62 fixed on a base 60, a movable stage 64 provided so as to be freely capable of approaching to or separating from the fixed stage 62, a load mechanism 58 for imparting a breaking load in the press-fitting direction of a wedge member 122, and second hydraulic cylinders 146a, 146b for clamping a cap part by pressing the end parts of third workpiece supporting members 130a, 130b from above. The third workpiece supporting members 130a, 130b and the second hydraulic cylinders 146a, 146b are respectively fixed to the movable stage 64 and provided so as to be capable of displacing integrally with the movable stage 64. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  More particularly, the present invention relates to a connecting rod split machining apparatus that constitutes an engine part for a vehicle, and more specifically, after integrally forming a connecting rod having a large end and a small end, the large end is capped. The present invention relates to a connecting rod splitting device for splitting into a rod part and a rod part.

  2. Description of the Related Art Conventionally, for example, a connecting rod that connects a piston pin and a crank pin has been widely used in a vehicle engine. The connecting rod has a large end connected to the crank pin and a small end connected to the piston pin. In the manufacturing process, from the large end to the small end of the connecting rod In general, for example, the large end portion is fractured and divided into a cap portion and a rod portion after being integrally formed by forging or the like.

  As a method of breaking and dividing this type of connecting rod, for example, Patent Document 1 discloses an internal pressure applying device that applies an internal pressure in an outward direction to a bearing hole of a bearing portion of a connecting rod, and an external pressure applied to the bearing portion. A set of external pressure applying devices, the external pressure applying device applies the external pressure to the bearing portion, the internal pressure applying device applies the internal pressure to the bearing portion, and the internal pressure applied by the internal pressure applying device divides the bearing portion. A method is disclosed in which the external pressure of the external pressure applying device is instantaneously released when the internal pressure is at a possible internal pressure, and the bearing portion is instantaneously divided by the internal pressure.

  Further, Patent Document 2 discloses first and second support members that are disposed on a base of a pallet on which a connecting rod is placed so as to be movable away from each other and horizontally support the connecting rod, A half mandrel comprising mandrel halves that are suspended from the first and second support members and each outer peripheral surface abuts against the inner surface of the opening, and surfaces that abut the opposing end surfaces of the mandrel halves are respectively tapered surfaces A wedge that evenly separates and expands each mandrel half, an actuator that applies a load to the wedge, an initial load applied to the actuator, and the mandrel half abuts against the inner surface of the opening, and then breaks. A connecting rod breaking device including a control circuit that momentarily breaks an opening by applying a load is disclosed.

Japanese Patent Laid-Open No. 10-277848 JP 2002-66998 A

  However, in Patent Document 1, there is a problem that it is difficult to detect the internal pressure that can be divided and control the timing of instantaneously releasing the external pressure of the external pressure applying device due to variations due to manufacturing errors of the connecting rod. .

  Moreover, in patent document 2, there exists a possibility that the lateral shake | fluctuation which generate | occur | produces when breaking a large end part into a cap part and a rod part cannot be suppressed completely, and either one side of right and left breaks first. There is a problem that it is difficult to shorten the time lag between the first rupture and one of the other ruptures after a slight delay.

  The present invention has been made in view of the above-described problems, and does not require a timing for releasing the external pressure. In addition, the connecting rod splitting apparatus can reduce the time lag between the first break and the second break as much as possible. The purpose is to provide.

To achieve the above object, according to the present invention, after integrally forming a connecting rod having a large end and a small end, the coupling hole of the large end is set in a set of expansion tools, A connecting rod splitting device for breaking and splitting the large end into a cap part and a rod part by press-fitting a wedge member between a pair of extenders to expand the expander,
A rod fixed to the fixed stage, having a fixed stage fixed on a base, and a movable stage disposed opposite to the fixed stage and provided in a horizontal direction so as to approach or separate from the fixed stage. The connecting rod is set in a state where the connecting rod is positioned at a predetermined position by one extension tool on the part side and the other extension tool on the cap part side that is fixed to the movable stage and is integrally displaced. A workpiece positioning holding mechanism for holding the connecting rod,
A load mechanism for applying a rupture load in the press-fitting direction of the wedge member in order to break and divide the large end portion;
With
The workpiece positioning and holding mechanism includes a first support means for pressing both shoulders on the cap portion side of the large end portion of the connecting rod toward the small end portion, and a side opposite to the end portion engaged with the connecting rod. And second support means for clamping the first support means by pressing the end of the first support means from above, and the first support means and the second support means are each fixed to a movable stage. The movable stage is integrally displaceable.

  In this case, the second support means comprises a hydraulic cylinder having a piston and a piston rod, and a block body in which a pressing surface that engages with the inclined surface of the first support means is formed at the tip of the piston rod. Should be connected.

  In addition, a preload applying mechanism for applying a preload in the press-fitting direction of the wedge member is provided in order to substantially press the pair of expansion tools on the inner surface of the coupling hole at the large end, and the preload applying mechanism provides a preload. After the load is applied, the second support means may be biased to clamp the first support means.

  According to the present invention, first, a connecting rod is set between one extension tool on the rod side fixed to the fixed stage and the other extension tool on the cap side fixed to the movable stage and integrally displaced. After that, the first support means is urged, and both shoulders on the cap portion side of the large end portion of the connecting rod are pressed toward the small end portion. That is, both shoulder portions of the cap portion are pressed by the first support means, and the pressing force is received by the other extension tool on the cap portion side fixed to the movable stage.

  Subsequently, the second support means is energized, and the end of the first support means opposite to the end engaged with the connecting rod is pressed from above to clamp the first support means. The Accordingly, when the first support means is further pressed in the pressing direction by the second support means, the cap portion of the connecting rod before the fracture split is formed between the first support means and the other extension tool on the movable stage side. It is firmly fixed between.

  In this state where the connecting rod is positioned and held, the load mechanism is urged and a breaking load is applied to the wedge member, whereby the wedge member is interposed between the one extension tool and the other extension tool. Press fit. As a result, the rod portion of the large end is fixed on the fixed stage side, and the cap portion of the large end is displaced integrally with the movable stage while being firmly fixed by the first support means and the second support means. Thus, the large end portion is broken and divided into the rod portion and the cap portion.

  In the present invention, the rod portion side of the large end portion of the connecting rod is fixed to the fixed stage, while the cap portion side is firmly fixed to the movable stage side by the first support means and the second support means. In such a state, when the large end portion of the connecting rod is broken and divided into the rod portion and the cap portion, only the cap portion is configured to be displaced together with the movable stage. The time lag between the first rupture and the subsequent rupture in the fracture surface can be suppressed as much as possible.

  As a result, in the present invention, it is possible to suitably prevent adverse effects such as deformation on the rod side due to the time lag between the first break and the second break.

  According to the present invention, there is no need to release the external pressure, and the time lag between the first break and the second break can be reduced as much as possible.

  A preferred embodiment of a connecting rod splitting apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

  FIG. 1A is a perspective view of a connecting rod 30 as a workpiece to which the present invention is applied, and FIG. 1B is a perspective view showing a state in which the connecting rod 30 is broken and divided into a cap portion 32 and a rod portion 34. is there.

  The connecting rod 30 includes a large end portion 38 in which a cap portion 32 and a rod portion 34 are integrally formed via a substantially circular coupling hole 36, and a small end disposed on the opposite side of the large end portion 38. Part 40. The connecting rod 30 is integrally formed by casting or forging, for example.

  Further, bolt holes 42a and 42b are formed on both sides of the large end portion 38 of the connecting rod 30 by a drilling means (not shown) such as a drill. In these bolt holes 42a and 42b, for example, in an assembly process of an engine or the like, bolts (not shown) are respectively screwed from the cap portion 32 side, and the cap portion 32 is fastened to the rod portion 34. In this manner, the cap portion 32 that is divided by breaking is fastened to the rod portion 34, whereby the large end portion 38 of the connecting rod 30 is connected to the crank pin of the engine.

  In FIG. 1A, reference numeral 44 indicates a divided portion that is a boundary portion between the cap portion 32 and the rod portion 34 in the large end portion 38. The dividing portion 44 is set on both sides of the large end portion 38 at portions facing the coupling hole 36 as a center.

  Next, a connecting rod dividing device 50 according to an embodiment of the present invention is shown in FIGS. 2 is a partially exploded perspective view of the division processing apparatus 50, FIG. 3 is a plan view of FIG. 2, and FIG. 3 is a longitudinal sectional view along the axial direction of FIG.

  The split processing device 50 is set with the connecting rod 30 positioned at a predetermined position, and includes a workpiece positioning holding mechanism 52 for holding the set connecting rod 30 and a large end portion 38 of the connecting rod 30. An impact load is applied to the fracture splitting mechanism 54 by dropping a fracture splitting mechanism 54 for splitting the fracture, a preload applying mechanism 56 for applying a preload to the fracture splitting mechanism 54, and a weight (heavy object) 57. And a load mechanism 58 for imparting.

  The work positioning and holding mechanism 52 includes a base 60 formed in a substantially rectangular shape when viewed from above, a fixed stage 62 fixed on the base 60, and a fixed stage 62 that is disposed opposite to the fixed stage 62. On the other hand, a movable stage 64 provided so as to be able to approach or separate in the horizontal direction along the axial direction of the base, and both ends of the base 60 so as to protrude outward in the axial direction of the base 60. The first bracket 66 and the second bracket 68 are respectively fixed to the parts.

  The fixed stage 62 includes a fixed table 70 fixed to the base 60 via a first bracket 66, a first hydraulic cylinder 72 fixed to the fixed table 70, and a piston rod of the first hydraulic cylinder 72. 72a, a movable block 76 connected to the distal end portion of the connecting rod 30 along the guide rail 74 and movable in the axial direction of the connecting rod 30, and a predetermined length protruding from the end of the movable block 76. It is fixed to the groove of the movable block 76, and engages with the small end 40 of the connecting rod 30 under the driving action of the first hydraulic cylinder 72 so that the small end 40 moves toward the large end 38 along the axial direction. And a first workpiece support member 78 that presses toward the first side.

  As shown in FIG. 2, a tapered engagement portion 80 that is recessed in a v-shaped cross section that engages with the small end portion 40 of the connecting rod 30 is provided at the distal end portion of the first work support member 78. It is formed.

  Further, the fixed stage 62 is slid along a pair of guide members 82a and 82b fixed on the fixed table 70 substantially in parallel with the movable block 76 therebetween, and the guide members 82a and 82b. The slider 86 is provided so as to be movable back and forth with respect to the connecting rod 30 via a pair of guide blocks 84, and a first air cylinder 88 fixed to the fixed table 70 and moving the slider 86 forward and backward.

  The slider 86 includes a second air cylinder 94 that is rotatably provided at a predetermined angle with a first pin 92 pivotally attached to a pair of bearing blocks 90a and 90b as a fulcrum, and a bifurcated branch portion. The joint member 96 connected to the piston rod 94a of the second air cylinder 94 and one end portion thereof are pivotally mounted between the branch portions of the joint member 96 via the second pin 98, and the central portion is connected to the third pin 100. And a second work support member 104 pivotally supported on the connecting plate 102 of the slider 86.

  The tip of the second workpiece support member 104 is provided with a pressing portion 104a having a substantially Y shape, and the pressing portion 104a rotates the third pin 100 under the driving action of the second air cylinder 94. By swinging (turning) a predetermined angle as a fulcrum, the upper surface portion of the large end portion 38 (rod portion 34) of the connecting rod 30 is pressed downward to hold the connecting rod 30.

  On the base 60 close to the fixing table 70, a fixing block 108 protruding in a bifurcated shape upward with a concave section 106 having a rectangular cross section in between is fixed. In the concave section 106 of the fixing block 108, A positioning fixing pin 110 is provided that positions and holds the end of the connecting rod 30 through the hole of the small end 40.

  In this case, when the first work support member 78 enters from the horizontal direction along the concave section 106 having a rectangular cross section of the fixed block 108, the axes of the first work support member 78 and the connecting rod 30 coincide with each other. Thus, the engaging portion 80 formed at the distal end portion of the first work support member 78 is guided so as to be surely engaged with the small end portion 40 of the connecting rod 30.

  Further, a holding block 112 fixed to the base 60 is provided between the fixed block 108 and the movable stage 64. On the holding block 112, a first mandrel 114 having a semicircular projection 114a that contacts the opening of the large end 38 is fixed.

  On the base 60, a pair of first guide elements 116a and 116b for guiding the movable stage 64 along the axial direction of the connecting rod 30 are fixed substantially in parallel. Each of the pair of first guide elements 116a and 116b is formed with a long groove extending in the axial direction between the upper surface of the base 60, and the flange portion 118a of the slide block 118 slides on the long groove. It is provided to move.

  A second mandrel 120 having a semicircular convex portion 120 a that contacts the opening of the large end 38 is fixed to the upper surface of the slide block 118, and the second mandrel 120 is displaced integrally with the movable stage 64. By doing so, the first mandrel 114 on the fixed stage 62 side is provided so as to be able to approach or separate by a predetermined distance. The first and second mandrels 114 and 120 function as a set of expansion tools.

  The mating surfaces of the semicircular convex portions 114a and 120a of the first and second mandrels 114 and 120 are respectively formed with concave portions 114b and 120b having a rectangular cross section, and the vertical portions are obtained by combining the concave portions 114b and 120b. A through hole is formed along the direction. The through hole is provided with a wedge member 122 having a rectangular cross section. In this case, the semicircular convex portions 114a and 120a of the first and second mandrels 114 and 120 are combined to form a circular convex portion, and the large end of the connecting rod 30 is connected to the circular convex portion. The coupling hole 36 of the part 38 is set.

  Further, a connecting plate 124 erected along the vertical direction is fixed to the end of the slide block 118, and a set of third air cylinders 126a and 126b are arranged on the connecting plate 124 along the horizontal direction at a predetermined interval. They are connected at a distance. A pair of third work support members (first support means) 130a, 130b are connected to the tip ends of the piston rods of the third air cylinders 126a, 126b via a shaft 128. The set of third work support members 130a and 130b can advance and retreat on the plane of the second mandrel 120 along the axial direction of the connecting rod 30 under the driving action of the set of third air cylinders 126a and 126b, respectively. Provided.

  One end portion of the pair of third work support members 130a and 130b along the axial direction is in contact with the cap portion 32 of the large end portion 38 of the connecting rod 30, and the connecting rod 30 is made small from the large end portion 38. A pair of protrusions 132 that are pressed in parallel with the axial direction toward the end 40 side are provided. An inclined surface 138 that engages with a pressing surface 136 of fourth work support members 134a and 134b, which will be described later, is provided at the other end of the third work support members 130a and 130b on the opposite side of the protrusion 132.

  In this case, the set of third work support members 130 a and 130 b is connected to the connecting rod 30 by the guiding action of the two sets of second guide elements 140 a to 140 d fixed substantially parallel to the upper surface of the flat surface of the second mandrel 120. It is provided so as to be displaced linearly along the axial direction.

  Furthermore, a fixed plate 141 is provided on the upper surface of the slide block 118, and a set of second hydraulic cylinders (second support means) is provided above the fixed plate 141 via a top plate 144 supported by a support portion 142. ) 146a and 146b are fixed. A set of fourth work support members 134a and 134b each formed of a substantially cubic block body is connected to the tip of the piston rod of the set of second hydraulic cylinders 146a and 146b, and the fourth work support member 134a. , 134b are provided to be displaceable along the vertical vertical direction.

  One side surface of the fourth work support members 134a and 134b is engaged with the inclined surface 138 of the third work support members 130a and 130b and presses the third work support members 130a and 130b toward the connecting rod 30 side. A pressing surface 136 is formed.

  The support part 142 is erected and fixed on the upper surface of the fixed plate 141, and is a set of first support plates 142a and 142b that are spaced apart from each other and extend substantially parallel to the axis of the connecting rod 30; A second support plate 142c connected to the upper side walls of the pair of first support plates 142a and 142b so as to be laid in a substantially horizontal direction, and substantially parallel to the vertical surface of the second support plate 142c. And a pair of third support plates 142d and 142e coupled to each other.

  The third support plates 142d and 142e are formed with a pair of convex portions 148 extending substantially parallel to the vertical direction, and the concave portions 150 and the convex portions respectively formed on the fourth work support members 134a and 134b. When the part 148 is engaged, the fourth work support members 134a and 134b are smoothly guided along the vertical direction. Further, the reaction force when the pressing surface 136 of the fourth workpiece support members 134a and 134b engages with the inclined surface 138 of the third workpiece support members 130a and 130b and presses the third workpiece support members 130a and 130b, It is suitably supported by a pair of third support plates 142d and 142e via first support plates 142a and 142b that are erected along the vertical direction.

  The first side wall 68a of the second bracket 68 projecting outward from the base 60 is connected to the tip of the first piston rod 152a by the connecting plate 124 so that the entire movable stage 64 is connected to the axis of the connecting rod 30. A fourth air cylinder 152 that is displaced along the direction is fixed. The fourth air cylinder 152 is configured by a double rod type in which each of the first piston rod 152a and the second piston rod 152b protrudes from both end portions along the axial direction of the cylinder tube. In this case, the first piston rod 152a is fixed to the connecting plate 124 connected to the slide block 118, and the second piston rod 152b is provided as a free end.

  A fifth air cylinder 154 is fixed to the second side wall 68b of the second bracket 68, and the end of the piston rod 154a of the fifth air cylinder 154 faces the second piston rod 152b of the fourth air cylinder 152. It is provided so that it can contact. By driving the fifth air cylinder 154 and extending the piston rod 154a, the second piston rod 152b of the fourth air cylinder 152 can be contacted and the entire movable stage 64 can be pressed and displaced.

  The fracture splitting mechanism 54 includes a first and second mandrels 114 and 120 having a pair of semicircular convex portions 114a and 120a in which the coupling hole 36 of the large end portion 38 is set, and the first and second mandrels 114. , 120 and a wedge member 122 that is press-fitted in order to expand in a direction away from each other.

  The semicircular convex portions 114a and 120a of the first and second mandrels 114 and 120 are formed with concave portions 114b and 120b into which the wedge member 122 is inserted, and the concave portions 114b of the first mandrel 114 on the fixed stage 62 side are formed. The wall surface is formed substantially along the vertical direction, and the wall surface of the recess 120b of the second mandrel 120 on the movable stage 64 side is formed in a taper shape that is inclined outward and directed upward (FIGS. 4 and 4). See 6).

  The wedge member 122 has a tapered surface 122a that widens toward the tip portion. The wedge member 122 is inserted into the recesses 114b and 120b so that the tapered surface 122a is in sliding contact with the wall surface of the second mandrel 120. Therefore, when the wedge member 122 is urged downward in FIG. 4, the first mandrel 114 and the second mandrel 120 slide away from each other due to the sliding action between the tapered surface 122a and the wall surface. Will be extended.

  As shown in FIG. 7, the preliminary load applying mechanism 56 includes a third hydraulic cylinder 156 that generates a preliminary load to be applied to the wedge member 122. The third hydraulic cylinder 156 includes a piston rod (load transmitting tool) 162 connected to the end of the wedge member 122 via a connecting means 160 including a connecting pin 158 and the like, and an annular formed on the piston rod 162. The piston 164 which has the step part 164a engaged with the level | step difference surface 162a of this is provided.

  The piston rod 162 passes through the central portion of the piston 164 and is slidable with respect to the piston 164. Therefore, the piston 164 of the third hydraulic cylinder 156 is integrally displaced with respect to the piston rod 162 in the press-fitting direction of the wedge member 122 and is provided so as to be able to be separated in a direction opposite to the press-fitting direction of the wedge member 122. ing. In other words, the third hydraulic cylinder 156 can apply the preliminary load only in one direction (vertically downward) of the piston rod 162 via the piston 164.

  The preliminary load applying mechanism 56 and the load mechanism 58 are provided with a common load transmission shaft (load transmission tool) 166 connected to the wedge member 122 via the piston rod 162. The shaft 166 is formed integrally with the piston rod 162 on the stepped surface 162a side. Further, a flange portion 166 a is provided on the other end side of the shaft 166, and the position of the flange portion 166 a can be adjusted in the axial direction of the shaft 166.

  On the load mechanism 58, a weight 57 is placed, and a lifting table 168 for generating an impact load applied to the wedge member 122 via the shaft 166 by contacting the flange portion 166a from above, and the lifting mechanism 58 A set of guide members 170a and 170b that slidably support the table 168 along the vertical vertical direction, and a set of buffer members 172a and 172b that alleviate the impact of the falling lift table 168 are provided. .

  The load mechanism 58 includes a stopper mechanism (not shown) that can adjust the lower limit position of the drop stroke of the lift table 168, and a lift table return mechanism (not shown) that returns the dropped lift table 168 to the upper drop standby position. And a return cylinder (not shown) for returning the wedge member displaced downward when the large end portion is broken and broken to the initial position.

  The connecting rod splitting apparatus 50 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described based on the flowchart shown in FIG. This will be described in detail.

  First, the integrally formed connecting rod 30 is set on the workpiece positioning and holding mechanism 52 (see FIG. 4). At that time, the connecting rod 30 is positioned on the small end portion 40 side by the positioning fixing pin 110 and the coupling hole 36 of the large end portion 38 is a circular convex portion 114a in which the first and second mandrels 114 and 120 are combined. , 120a (step S1).

  The connecting rod 30 set in this way is held at a predetermined position via the workpiece positioning holding mechanism 52. That is, by driving the first hydraulic cylinder 72, the movable block 76 connected to the tip of the piston rod 72a is displaced toward the connecting rod 30 side under the guide action of the guide rail 74. The first work support member 78 fixed to the groove portion of the movable block 76 engages with the small end portion 40 of the connecting rod 30 and presses the small end portion 40 toward the large end portion 38 along the axial direction. (Step S2).

  In this case, as shown in FIG. 5, the first work support member 78 advances in the horizontal direction along the concave portion 106 having a rectangular cross section that branches into a bifurcated shape of the fixed block 108. An engaging portion 80 having a v-shaped cross section formed at the distal end portion of the support member 78 is guided so as to engage with the small end portion 40 of the connecting rod 30 in a coaxial state along the axial direction.

  Subsequently, by driving the pair of third air cylinders 126a and 126b, respectively, the pair of third work support members 130a and 130b connected to the tip end portion of the piston rod via the shaft 128 becomes the second guide. It slides and displaces along the axial direction of the connecting rod 30 under the guiding action of the elements 140a to 140d. Accordingly, the protrusions 132 of the pair of third work support members 130a and 130b abut against both shoulders of the cap portion 32 of the connecting rod 30, and the connecting rod 30 is moved from the large end portion 38 to the small end portion 40 side. By pressing along the axial direction, both shoulder portions of the cap portion 32 are supported from the lateral direction (horizontal direction) (step S3).

  In this case, the protrusions 132 of the third work support members 130a and 130b abut against both shoulders of the cap portion 32 of the connecting rod 30 so that the inclination (axis) of the connecting rod 30 is set in a predetermined positioning direction. Is slightly pressed (correction with respect to the axial direction of the connecting rod 30).

  Subsequently, by driving the second air cylinder 94 and extending the piston rod 94a connected to the joint member 96, the second work support member 104 has a predetermined angle toward the lower side with the third pin 100 as a rotation fulcrum. Rotate only. When the second workpiece support member 104 is rotated by a predetermined angle, the tip end of the substantially Y-shaped pressing portion 104a comes into contact with the upper surface of the large end portion 38 near the coupling hole 36 of the connecting rod 30 at two points. The large end portion 38 is pressed downward (step S4).

  In this case, the convex portions 114a and 120a of the first and second mandrels 114 and 120 engage with the coupling hole 36 on the large end portion 38 side of the connecting rod 30 and are positioned in the hole portion on the small end portion 40 side. It is confirmed by a seating confirmation means (not shown) that the fixing pin 110 is engaged and that the connecting rod 30 is seated on the flat portion of the upper surface of the first mandrel 114 (step S5).

  Specifically, for example, an air discharge hole is provided in the flat portion on the upper surface of the first mandrel 114 as a seating confirmation means, and the connecting rod 30 is seated on the flat portion of the first mandrel 114 to close the air discharge hole. Thus, it is confirmed that the connecting rod 30 is securely seated by detecting by a sensor (not shown) that the air discharge flow rate has decreased (the air discharge pressure from the air discharge hole has decreased).

  Next, by driving the third hydraulic cylinder 156 of the preliminary load applying mechanism 56, the piston 164 is urged downward, and is engaged with the step portion 164a as the piston 164 is lowered. The piston rod 162 is similarly operated downward through the step surface 162a (see FIG. 7). At the same time, the wedge member 122 connected to the piston rod 162 is biased downward, and a preliminary load is applied to the wedge member 122 (step S6).

  Accordingly, the wedge member 122 is sandwiched and press-fitted between the concave portions 114 b and 120 b of the first and second mandrels 114 and 120, and the wall surface of the tapered concave portion 120 b of the second mandrel 120 and the wedge member 122. Under the sliding action with the taper surface 122a, it is slightly expanded while sliding. Then, the convex portion 114a of the first mandrel 114 and the convex portion 120a of the second mandrel 120 are spaced apart from each other by a predetermined distance along the horizontal direction, and the convex portions 114a and 120a are substantially crimped to the inner surface of the coupling hole 36. The

  In this case, the preliminary load applied to the wedge member 122 is such that the large end portion 38 is not broken even when the convex portions 114a and 120a contact the inner surface of the coupling hole 36 of the large end portion 38, that is, the large end portion. It is set within a range where the portion 38 can be elastically deformed. As a result, there is no rattling between the large end portion 38 and the convex portions 114a and 120a of the first and second mandrels 114 and 120, and the connecting rod 30 as the workpiece is the first and second. The mandrel 114, 120 is securely held by the pair of convex portions 114a, 120a.

  In this manner, in the state in which the preload is applied to the coupling hole 36 of the large end portion 38 of the connecting rod 30, the pair of second hydraulic cylinders 146a and 146b are driven to support the fourth workpiece made of a block body. The members 134a and 134b are displaced vertically downward. In this case, the convex portion 148 formed on the pair of third support plates 142d and 142e of the support portion 142 and the side surfaces of the fourth work support members 134a and 134b facing the third support plates 142d and 142e are formed. By engaging with the recessed portion 150, a guide action for the vertically downward direction is performed (see FIG. 3).

  As the fourth work support members 134a and 134b are lowered, the pressing surfaces 136 of the fourth work support members 134a and 134b and the inclined surfaces 138 formed at the ends of the third work support members 130a and 130b are mutually connected. And the pair of third work support members 130a and 130b are pressed toward the cap portion 32 side of the connecting rod 30 (step S7).

  As a result, the cap portion 32 of the connecting rod 30 supports a pair of third portions that support both shoulder portions of the cap portion 32 under the pressing action of the pair of fourth work support members 134a and 134b in the vertical downward direction. The workpiece supporting members 130a and 130b and the convex portion 120a of the second mandrel 120 between the shoulder portions of the cap portion 32 are completely fixed.

  In this state where the cap portion 32 of the connecting rod 30 is firmly locked, the lift table 168 is dropped together with the weight 57 under the guide action of the guide members 170a and 170b after the stopper for the lift table 168 is released. . Therefore, when the dropped lifting table 168 contacts the flange portion 166a of the shaft 166, the shaft 166 is urged downward and an impact load is applied to the wedge member 122 (see FIG. 8) (step). S8). At this time, the piston 164 of the third hydraulic cylinder 156 can be separated from the shaft 166 in the press-fitting direction of the wedge member 122, that is, in the direction opposite to the direction of the impact load. A predetermined impact load is surely applied to the wedge member 122 without being attenuated by 156.

  The wedge member 122 is further press-fitted into the concave portions 114b and 120b of the first and second mandrels 114 and 120, and the wall surface of the tapered concave portion 120b of the second mandrel 120 and the tapered surface 122a of the wedge member 122 It is further expanded while sliding under the sliding action. When the first mandrel 114 and the second mandrel 120 are further separated from each other in the substantially horizontal direction, the large end portion 38 exceeds the elastically deformable limit, and the divided portion 44 where stress is concentrated is used as a boundary. The cap part 32 and the rod part 34 are broken and divided (see FIGS. 9 and 10) (step S9). At this time, since the cap portion 32 is held by the protrusions 132 of the third work support members 130a and 130b under the urging action of the second hydraulic cylinders 146a and 146b, the cap portion 32 that has been divided by breaking is scattered. Definitely blocked.

  That is, in a state where the first mandrel 114 provided on the fixed stage 62 side is fixed, the second mandrel 120 provided on the movable stage 64 side is applied by applying a predetermined impact load to the wedge member 122. Under the guide action of the first guide elements 116a, 116b, the slide block 118 is integrally displaced on the base 60.

  Therefore, in the state where the rod portion 34 of the connecting rod 30 is fixed to the fixed stage 62 side by the first mandrel 114, the positioning fixing pin 110, and the first workpiece support member 78, the cap portion 32 is a set of fourth workpiece support members. The second mandrel 120 and the slide block 118 on the movable stage 64 side are separated from the fixed stage 62 while maintaining a state of being firmly locked by the 134a and 134b, the third work support members 130a and 130b, and the second mandrel 120. By sliding and displacing on the base 60 in the direction, the connecting rod 30 is broken and divided into a cap portion 32 and a rod portion 34.

  After the large end portion 38 of the connecting rod 30 is split into the cap portion 32 and the rod portion 34, a return cylinder (not shown) is driven to raise the wedge member 122 to return to the initial position. Further, by driving the fourth air cylinder 152 fixed to the movable stage 64 via the second bracket 68 and extending the first piston rod 152a, the movable stage 64 is displaced toward the fixed stage 62 side, The clearance between the fracture surface of the cap portion 32 and the rod portion 34 of the large end portion 38 is stopped with a clearance of about 2 mm.

  Subsequently, by driving the first hydraulic cylinder 72, the second hydraulic cylinders 146a, 146b, the second air cylinder 94, and the third air cylinders 126a, 126b, respectively, the first to fourth work support members 78, 104, 130a, 130b, 134a, 134b return to the initial position substantially simultaneously (step S10).

  After the members restraining the cap portion 32 and the rod portion 34 of the connecting rod 30 thus broken and divided return to the initial position and the connecting rod 30 is opened, it is attached to the arm of a multi-axis robot (not shown). The cap portion 32 and the rod portion 34 are respectively held by the set of chuck mechanisms, and the cap portion 32 and the rod portion 34 are transferred to the next process. Finally, the fifth air cylinder 154 is driven to displace the entire movable stage 64, and the movable stage 64 returns to the initial position.

  For example, as shown in FIG. 12, when a large end portion is broken and divided into a cap portion and a rod portion using a break dividing device (not shown) according to the prior art, a first break (part) and a rear break (part) If a slight time lag is generated between the two, a stress that causes the first fracture to act on the rod portion and a force that deforms the rod portion toward the rear fracture site is applied. As a result, there is a possibility that an adverse effect of deforming the rod portion and deforming the hole portion of the small end portion as shown by a two-dot chain line in FIG. 12 may occur. Note that the connecting rod 30 is required to have high dimensional accuracy in the shape of the hole portion of the rod portion and the small end portion due to its characteristics as a product.

  In other words, when the integrally formed connecting rod 30 is divided into two parts, that is, the cap part 32 and the rod part 34, bending stress acts on a part of the divided part, resulting in distortion on a part of the divided surface. Or may adversely affect part accuracy. That is, the two parts have bifurcated legs by division, but at the time of division, division at both legs does not proceed at the same time, and usually division at one of the legs is not performed. Precedes and the division proceeds at the other leg with some time delay. Therefore, when the division of one leg that breaks first is completed, the division at the other leg that breaks later is still in progress, and the last of the division of the other leg is advanced at the latest. This is because the separation between the two parts begins on the one leg side divided in this manner.

  On the other hand, in the present embodiment, the rod portion 34 side of the large end portion 38 of the connecting rod 30 is fixed to the fixing stage 62, while the cap portion 32 side is fixed to a pair of third work support members 130a, 130b and The third workpiece support members 130a and 130b are firmly fixed to the movable stage 64 side by a pair of second hydraulic cylinders 146a and 146b. In this state, in the present embodiment, when the large end portion 38 of the connecting rod 30 is divided into the cap portion 32 and the rod portion 34, only the cap portion 32 is displaced together with the movable stage 64. Therefore, the time lag between the first rupture and the rear rupture at the fracture surface of the cap portion 32 and the rod portion 34 can be suppressed as much as possible.

  As a result, in this embodiment, the timing for releasing the external pressure is not required as in the prior art, and the time lag between the pre-break and post-break can be reduced as much as possible.

  Further, in the present embodiment, the connecting rod 30 is described as being broken and divided based on the impact load caused by the falling of a heavy object. However, the present invention is not limited to this. For example, another embodiment shown in FIG. As shown in the division processing apparatus according to the embodiment, the wedge member 122 is pulled downward only by the driving force of a single hydraulic cylinder 156 so as to give a breaking load to the wedge member 122. Also good.

  In this case, as shown in FIG. 14, the large end portion is obtained by gradually increasing the driving force (tensile force) of the hydraulic cylinder 156 without applying a preload to the wedge member 122. 38 can be broken and divided into a cap portion 32 and a rod portion 34 (see step S7).

FIG. 1A is a perspective view of a connecting rod to which the present invention is applied, and FIG. 1B is a perspective view showing a state in which the connecting rod is broken and divided into a cap portion and a rod portion. It is a partial exploded perspective view of the division | segmentation processing apparatus which concerns on embodiment of this invention. It is a top view of the division | segmentation processing apparatus shown in FIG. It is a longitudinal cross-sectional view along the axial direction of the division | segmentation processing apparatus shown in FIG. It is a partial cross-section enlarged perspective view of the division processing apparatus shown in FIG. It is a partial expanded longitudinal cross-sectional view of the division | segmentation processing apparatus shown in FIG. It is a partial cross section front view which shows the state in which the preliminary load was provided by the preliminary load provision mechanism in the said division | segmentation processing apparatus. It is a partial cross section front view which shows the state to which the impact load was provided by the said preliminary load provision mechanism. It is a partial expansion perspective view which shows the state by which the connecting rod was fractured | ruptured into the cap part and the rod part. It is a partial expansion perspective view which shows the state by which the connecting rod was fractured | ruptured into the cap part and the rod part. It is a flowchart which shows operation | movement of the division | segmentation processing apparatus of FIG. When a cap part and a rod part are ruptured, it is a figure used for description of an adverse effect when there is a time lag between a first rupture and a subsequent rupture. It is a longitudinal cross-sectional view of the division | segmentation processing apparatus which concerns on other embodiment of this invention. It is a flowchart which shows operation | movement of the division | segmentation processing apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 30 ... Connecting rod 32 ... Cap part 34 ... Rod part 36 ... Coupling hole 38 ... Large end part 40 ... Small end part 50 ... Dividing processing device 52 ... Work positioning holding mechanism 54 ... Breaking division mechanism 56 ... Preloading mechanism 57 ... Weight 58 ... Load mechanism 60 ... Base 62 ... Fixed stage 64 ... Movable stage 70 ... Fixed table 72 ... First hydraulic cylinder 74 ... Guide rail 76 ... Movable block 78 ... First work support member 80 ... engaging portion 88 ... first DESCRIPTION OF SYMBOLS 1 Air cylinder 94 ... 2nd air cylinder 104 ... 2nd workpiece support member 108 ... Fixing block 110 ... Positioning fixing pin 114 ... 1st mandrel 120 ... 2nd mandrel 122 ... Wedge member 126a, 126b ... 3rd air cylinder 130a, 130b ... third workpiece support members 134a, 134b ... fourth workpiece support members 146a, 46b ... second hydraulic cylinder 152 ... fourth air cylinder 154 ... fifth air cylinders 156 ... third hydraulic cylinder 166 ... Shaft 168 ... lift table

Claims (3)

After integrally forming a connecting rod having a large end and a small end, the coupling hole of the large end is set in a set of expansion tools, and a wedge member is press-fitted between the set of expansion tools. A connecting rod splitting device for splitting the large end portion into a cap part and a rod part by expanding an extension tool,
A rod fixed to the fixed stage, having a fixed stage fixed on a base, and a movable stage disposed opposite to the fixed stage and provided in a horizontal direction so as to approach or separate from the fixed stage. The connecting rod is set in a state where the connecting rod is positioned at a predetermined position by one extension tool on the part side and the other extension tool on the cap part side that is fixed to the movable stage and is integrally displaced. A workpiece positioning holding mechanism for holding the connecting rod,
A load mechanism for applying a rupture load in the press-fitting direction of the wedge member in order to break and divide the large end portion;
With
The workpiece positioning and holding mechanism includes a first support means for pressing both shoulders on the cap portion side of the large end portion of the connecting rod toward the small end portion, and a side opposite to the end portion engaged with the connecting rod. And second support means for clamping the first support means by pressing the end of the first support means from above, and the first support means and the second support means are each fixed to a movable stage. And a connecting rod splitting device, wherein the splitting device can be displaced integrally with the movable stage. The apparatus of claim 1.
The second support means comprises a hydraulic cylinder having a piston and a piston rod, and a block body having a pressing surface that engages with the inclined surface of the first support means is connected to the tip of the piston rod. A connecting rod split machining apparatus characterized by the above. The apparatus of claim 1.
A preload application mechanism for applying a preload in the press-fitting direction of the wedge member is provided in order to substantially crimp a set of expansion tools to the inner surface of the coupling hole at the large end, and the preload is applied by the preload application mechanism. After being applied, the connecting rod splitting apparatus characterized in that the second support means is biased to clamp the first support means.

Images