JP5072341B2 - Member connection method and composite member connected by the same method - Google Patents

Description

  In the present invention, a shaft portion formed in a shaft shape is inserted into a second member formed by casting or forging using a die in a cylindrical tube portion formed in the first member, and both members are connected. The present invention relates to a member connection method to be performed and a composite member connected by the connection method.

In general, in suspension mechanisms and steering mechanisms employed in vehicles such as automobiles, link members are used to connect the constituent elements to each other. As one of such link members, for example, there is a suspension arm used in an automobile suspension mechanism as shown in Patent Document 1 below.
JP-A-11-93997

  This suspension arm is mainly composed of an arm member formed in a cylindrical shape, and a first bearing member and a second bearing member molded by casting. Specifically, each end portion of the arm member is caulked (pressed) in a state where the shaft-like shaft-like connecting portions respectively formed on the first bearing member and the second bearing member are respectively inserted into both end portions of the arm member. The arm member and the first bearing member and the second bearing member are integrally connected by plastic deformation by processing.

  However, in the first bearing member and the second bearing member that are molded by casting, there is a case where a so-called cast flash is generated on the mating surface portion of the mold, and a part of the gate that has been removed from the gate portion may remain in a convex shape. . For this reason, when inserting each axial connection part in a 1st bearing member and a 2nd bearing member in an arm member, it is necessary to remove beforehand these cast-flashes and a part of remaining pouring gate, It was a complicated task.

  The present invention has been made to cope with the above problem, and its purpose is to form a shaft portion of a second member formed by casting or forging using a die in a cylindrical tube portion formed on the first member. It is an object to provide a member connecting method that does not require an operation of removing flash or the like generated in the shaft portion of the second member when connecting and connecting the composite members connected by the connecting method.

In order to achieve the above object, a feature of the present invention is that a shaft formed in a shaft shape on a second member formed by casting or forging using a die in a cylindrical tube portion formed on the first member. In the member connecting method for inserting the first part and connecting the first member and the second member, the same is applied to the surface of the shaft part of the second member where the flash is generated by casting or forging. First, by forming a relief portion having a recessed shape along the side and plastically deforming the cylindrical portion into which the shaft portion is inserted into a shape corresponding to the shape of the relief portion, using a press die. This is to connect the member and the second member .

  In this case, the die used for the casting or forging is composed of two or more dies, and a relief portion is formed on the surface of the shaft portion corresponding to a boundary portion where the two or more dies are combined with each other. Good. Alternatively, or in addition to this, an escape portion may be formed on the surface of the shaft portion corresponding to the gate portion in the casting.

  According to the feature of the present invention configured as described above, the escape portion is formed on the outer peripheral surface of the shaft portion of the second member that is inserted into the cylindrical portion of the first member, where the flash occurs. For this reason, when the shaft portion of the second member is inserted into the cylindrical portion of the first member, the coaxial portion can be inserted into the cylindrical portion without being affected by the flash. As a result, even if a flash is generated on the surface of the shaft portion of the second member, processing for removing the beam from the shaft portion is unnecessary, and the first member and the second member are connected. The manufactured composite member can be efficiently manufactured. Here, the flash generated on the surface of the shaft portion of the second member is a flash generated by the mating surface portion of the mold, or the gate and various runners left in the casting when the gate and various runner portions in casting are removed. It also includes a part of

Further, the present invention is characterized in that the first member and the second member are connected by plastically deforming the cylindrical portion in which the shaft portion is inserted using press working. According to this, the inner peripheral surface of the first member is plastically deformed along the shape of the relief portion by press working. Thereby, the coupling strength around the axis in the second member connected to the first member is improved, and the rotational displacement of the second member relative to the first member is prevented.

In addition, a feature of the present invention is that the shape of the press die used for pressing is formed into a shape corresponding to the shape of the relief portion. According to this, the first inner peripheral surface can be plastically deformed so as to be more closely attached to the escape portion. Thereby, the joint strength around the axis in the second member connected to the first member is further improved.

  In this case, it is preferable to press the cylindrical portion surface corresponding to the relief portion formed in the shaft portion. According to this, the first inner peripheral surface can be plastically deformed so as to be more closely attached to the escape portion. Thereby, the joint strength around the axis in the second member connected to the first member is further improved.

Another feature of the present invention is that, in the member connection method, the relief portion is formed in a planar shape. According to this, since the escape portion is formed in a planar shape, the escape portion can be easily formed without performing complicated processing on the shaft portion of the second member.

  In addition, the present invention can be implemented not only as a method for connecting members, but also as an invention for a composite member connected using the connection method and an invention for a method for manufacturing the composite member.

  Hereinafter, an embodiment of a member connecting method according to the present invention will be described with reference to the drawings. FIG. 1 is a front view showing the entire stabilizer link SL manufactured by using the member connecting method according to the present invention. Here, the stabilizer link is a link member that connects the stabilizer and the suspension arm in a suspension mechanism employed in an automobile, and is a member for improving the running stability of the vehicle body.

  The stabilizer link SL fixes a ball joint 20 formed in a substantially convex shape to one end of an arm member 10 formed in a cylindrical shape, and is fixed to the other end of the arm member 10 in the same manner as the ball joint 20. A ball joint 30 having a different structure is fixed downward in the figure. The arm member 10 is a member formed by drawing an aluminum alloy into a pipe shape, and corresponds to a first member according to the present invention. In the drawing, the central portion of the arm member 10 is omitted.

  As shown in FIGS. 2A and 2B, the ball joint 20 includes a ball stud 21, a bearing member 22, a bearing seat 23, a plug 24, and a dust cover 25. Among these, the ball stud 21 is made of a steel material, and a spherical ball portion 21b is formed at one end portion of the stud portion 21a formed in a substantially cylindrical shape, and at the other end portion of the stud portion 21a. A male screw portion 21d is formed through the flange portion 21c.

As shown in detail in FIGS. 3A to 3C, the bearing member 22 includes a socket portion 22a formed in a cylindrical shape and a shaft portion 22b formed extending in the horizontal direction from the socket portion 22a. It is configured. The bearing member 22 is formed by casting an aluminum alloy, and a so-called cast beam 22c having a shape protruding in a bowl shape is formed on the outer peripheral surface of the bearing member 22 along a mating surface of two molds used for casting. Yes. The socket portion 22 a is a portion that accommodates the ball portion 21 b of the ball stud 21 in its cylinder, and the shaft portion 22 b is a portion that connects the bearing member 22, that is, the ball joint 20 to the arm member 10. A connecting portion 22d for connecting the bearing member 22 to the arm member 10 is formed in a substantially columnar shape at the tip portion of the shaft portion 22b, and an outer peripheral surface thereof is formed in a bellows shape along the axial direction. . The outer diameter phi _S of the connection portion 22d is connected portion 22d is smaller than the inner diameter phi _H of the arm member 10 to the extent that is inserted in a fitting suitable without rattling in the cylinder of the arm member 10.

In addition, on the outer peripheral surface in the width direction of the connecting portion 22d, in other words, on the outer peripheral surface of the connecting portion 22d where the cast beam 22c is formed, relief portions 22e and 22f molded in a flat shape are formed. The escape portions 22e and 22f are provided to prevent the connection portion 22d from being unable to be inserted into the cylinder of the arm member 10 by the cast beam 22c formed on the connection portion 22d. Accordingly, the escape portions 22e and 22f have a length L that is the sum of the thickness in the width direction of the connection portion 22d and the protrusions of the cast beams 22c formed on the escape portions 22e and 22f, respectively, and the outer diameter of the connection portion 22d. It is formed to be smaller than phi _S. In the present embodiment, it is assumed that the protruding amount of the flash beam 22c is 0.3 to 0.5 mm.

  A bearing seat 23 is provided between the inner wall of the socket portion 22 a inside the socket portion 22 a of the bearing member 22 and the ball portion 21 b of the ball stud 21. The bearing seat 23 is made of a synthetic resin material, and holds the ball portion 21b of the ball stud 21 in a socket 22a of the bearing member 22 so as to be rotatable. The bearing seat 23 is held in the socket 22a by a substantially concave plug 24 made of steel. A dust cover 25 made of a rubber material is provided on the upper portion of the socket portion 22a of the bearing member 22 so as to cover the stud portion 21a of the ball stud 21. Since the ball joint 30 has the same configuration as the ball joint 20, the description thereof is omitted. The ball joint 20 or the ball joint 30 corresponds to the second member according to the present invention.

  A method of connecting the arm member 10 and the ball joints 20 and 30 in the process of manufacturing the stabilizer link SL configured as described above will be described. Since the ball joint 20 and the ball joint 30 have the same configuration, only the connection method between the arm member 10 and the ball joint 20 will be described, and the connection method between the arm member 10 and the ball joint 30 will be omitted.

  First, the worker prepares a ball stud 21, a bearing member 22, a bearing seat 23, a plug 24, and a dust cover 25 that are parts constituting the ball joint 20. In this case, as shown in FIGS. 3A to 3C, the bearing member 22 is integrally formed by casting in a state where the escape portions 22e and 22f are formed in the connection portion 22d. Further, on the outer peripheral surface of the bearing member 22, a cast beam 22 c is formed along a mating surface of a mold used for casting. In other words, the cast beams 22c are respectively formed on the relief portions 22e and 22f of the connection portion 22d. The worker completes the ball joint 20 by assembling the ball stud 21, the bearing member 22, the bearing seat 23, the plug 24, and the dust cover 25 based on a predetermined work process. Since the predetermined work process for completing the ball joint 20 is not directly related to the present invention, the description thereof is omitted.

Next, the operator prepares an arm member 10 that is a member constituting the stabilizer link SL. 4A and 4B, the connecting portion 22d of the ball joint 20 is inserted into one end of the arm member 10 (the left end in the drawing). In this case, a cast beam 22c is formed on the relief portions 22e and 22f. However, the length L between the tip portions of the cast beams 22c formed on the relief portions 22e and 22f is different from that of the connection portion 22d. smaller than the diameter phi _S, i.e., smaller than the inner diameter phi _H of the arm member 10, the connecting portion 22d is inserted into without hindrance arm member 10.

  Next, the operator connects the arm member 10 and the ball joint 20 using a pressing device (not shown). The press device is a processing device for compressing and deforming a portion of the end surface of the arm member 10 where the connecting portion 22d is inserted to connect the arm member 10 and the ball joint 20, and includes two press dies 40, 50.

  The press die 40 is a stationary stationary die for placing a portion of the arm member 10 where the connecting portion 22d is inserted. The press surface 41 on which the arm member 10 in the press die 40 is placed includes an outer peripheral press surface 42 formed in a semicircular shape along the outer peripheral surface of the arm member 10 and an outer peripheral press surface 42 (or the arm member 10). Three caulking convex portions 43 projecting from the outer peripheral press surface 42 along the circumferential direction are provided along the longitudinal direction of the press die 40. Here, the caulking convex portion 43 is a portion that presses the outer peripheral surface of the arm member 10 corresponding to the small diameter portion in the connection portion 22d formed in a bellows shape, and is provided at intervals corresponding to the intervals of the small diameter portions. ing. On the other hand, the press die 50 is a moving die that is arranged in a state where it can be advanced and retracted relative to the press die 40. The press die 50 is formed with a press surface 51, an outer peripheral press surface 52, and a caulking convex portion 53 corresponding to the press die 40, respectively.

  The operator sets the arm member 10 and the ball joint 20 in a state where the connection portion 22d is inserted into the arm member 10 on the press die 40 of the press device. In this case, the operator sets the arm member 10 and the ball joint 20 so that the escape portions 22e and 22f of the connection portion 22d oppose the press dies 40 and 50. And an operator compresses and deforms the outer peripheral surface of the arm member 10 in which the connection part 22d is inserted, and connects the arm member 10 and the ball joint 20 by operating a press apparatus. 5A to 5C, the outer peripheral surface of the end portion of the arm member 10 is plastically deformed along the shape of the press surfaces 41 and 51 of the press dies 40 and 50. In this case, as shown in FIG. 5C, the portion between the press die 40 and the press die 50 on the outer peripheral surface of the end portion of the arm member 10 is plastically deformed outward. Further, the inner peripheral surface of the end portion of the arm member 10 is plastically deformed along the shape of the outer peripheral surface of the connection portion 22d.

  Next, the operator takes out the arm member 10 to which the ball joint 20 is connected from the press device, and connects the ball joint 30 to the other end of the arm member 10 by the same procedure as the ball joint 20. Thereby, the ball joint 20 and the ball joint 30 are respectively connected to both ends of the arm member 10, and the stabilizer link SL is substantially completed. Since other steps for completing the stabilizer link SL are not directly related to the present invention, the description thereof is omitted.

As can be understood from the description of the above connection method, according to the above embodiment, a flat relief is formed on the outer peripheral surface of the connection portion 22d inserted into the cylinder of the arm member 10 and where the cast-in flash 22c is generated. Portions 22e and 22f are formed. In this case, the escape portion 22e, 22f, the length L between the tip of the cast beams 22c is formed to be smaller than the outside diameter phi _S of the connection portion 22d. For this reason, when inserting the connecting portion 22d into the cylinder of the arm member 10, the connecting portion 22d can be inserted into the arm member 10 without being affected by the cast beam 22c. As a result, even if the cast-in beam 22c is generated in the connecting part 22d, a processing operation for removing the cast-in beam 22c from the connecting part 22d becomes unnecessary, and the stabilizer link SL can be manufactured efficiently. .

  Further, the inner peripheral surface of the arm member 10 is plastically deformed along the shape of the relief portions 22e and 22f formed in a flat shape by pressing. Thereby, the coupling strength around the axis of the ball joint 20 connected to the arm member 10 is improved, and the rotational displacement of the ball joint 20 relative to the arm member 10 is prevented.

  Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention.

  In the above-described embodiment, the bearing member 22 of the ball joint 20 is molded by casting. However, the present invention is not limited thereto as long as the molding method generates a flash on the surface of the molded product, that is, a manufacturing method using a mold. It is not something. For example, the bearing member 22 may be molded by die casting or forging. Also by this, the same effect as the above-mentioned embodiment can be expected.

  Moreover, in the said embodiment, although escape part 22e, 22f was formed corresponding to the casting beam 22c produced on the surface of the connection part 22d resulting from the mating surface of the casting_mold | template by casting, the position which forms an escape part is It is not limited to this. For example, in the case where the gate portion in the mold is connected to the connection portion 22d, a relief portion may be formed on the surface of the connection portion 22d to which the gate portion is connected. That is, when the gate portion in the mold is connected to the connection portion 22d, an unnecessary casting corresponding to the gate portion is connected to the connection portion 22d after casting. Therefore, it is necessary to remove such an unnecessary part from the connection part 22d, but a part of the unnecessary part may remain in a convex shape on the surface of the connection part 22d. For this reason, if the escape portion is formed on the surface of the connection portion 22d to which the gate portion is connected, even if a part of the unnecessary portion remains on the escape portion, the remaining portion as in the above embodiment. The connection portion 22d can be inserted into the arm member 10 without being affected by the above. In addition, what is necessary is just to provide one escape part corresponding to the same gate, when providing a relief part in a gate part. Further, the present invention can be similarly applied to unnecessary portions other than the gate, for example, various hot water passages such as a hot water pouring gate, a pouring gate, and a vent hole.

  Moreover, in the said embodiment, although the shape of the outer peripheral surface of the connection part 22d was formed in the bellows shape, it is not limited to this. In the above embodiment, the outer peripheral surface of the connecting portion 22d is formed in a bellows shape in order to improve the coupling strength in the axial direction of the ball joint 20 connected to the arm member 10. Therefore, if attention is not paid to the coupling strength in the axial direction of the ball joint 20, even if the outer peripheral surface of the connecting portion 22d is formed in a shape other than the bellows, for example, a simple columnar shape, the same effect as in the above embodiment is obtained. Can be expected.

  Moreover, in the said embodiment, in order to improve the joint strength around the axis in the ball joint 20 connected to the arm member 10, the press which presses the outer peripheral surface of the arm member 10 from the direction which opposes the escape parts 22e and 22f. Processing was performed. However, unless attention is paid to the coupling strength around the axis of the ball joint 20, the direction in which the outer peripheral surface of the arm member 10 is pressed is different from the direction in the above embodiment, for example, from the direction orthogonal to the pressing direction in the above embodiment. The outer peripheral surface of the arm member 10 may be pressed. Also by this, the same effect as the above-mentioned embodiment can be expected.

  Moreover, in the said embodiment, the shape of the crimping convex parts 43 and 53 in the press dies 40 and 50 was formed in circular arc shape. However, as shown in FIG. 6, a part of the shape of the caulking convex portions 43 and 53 can be formed in a shape corresponding to the shape of the escape portions 22e and 22f, that is, a planar shape. According to this, by pressing the outer peripheral surface of the arm member 10, the inner peripheral surface of the arm member 10 is plastically deformed in a state where the inner peripheral surface is further in close contact with the escape portions 22e and 22f. As a result, the joint strength around the axis of the ball joint 20 connected to the arm member 10 can be further improved.

  In the above embodiment, planar relief portions 22e and 22f are formed in the connection portion 22d. However, the shape of the escape portions 22e and 22f is not limited to this as long as the cast beam 22c generated on the connection portion 22d does not obstruct the insertion of the connection portion 22d into the cylinder of the arm portion 10. . In other words, it may be a shape that is recessed along the cast beam 22c generated on the connecting portion 22d. For example, as shown in FIG. 7, the relief portions 22e and 22f may be formed in a spherically recessed shape. Good. Also by this, the same effect as the above-mentioned embodiment can be expected. In this case, as in the above-described modified example, the shape of the crimping convex portions 43 and 53 in the press dies 40 and 50 may be a shape corresponding to the shape of the relief portions 22e and 22f. According to this, the inner peripheral surface of the arm member 10 is plastically deformed in a state of being in close contact with the escape portions 22e and 22f, and the coupling strength around the axis of the ball joint 20 connected to the arm member 10 is further increased than in the above modification. Can be improved.

In the above-described embodiment, the relief portion 22e formed on the connecting portion 22d, the 22f, the length L between the tip of the cast beams 22c is to be smaller than the outer diameter phi _S of the connection portion 22d Formed. This is because the connecting portion 22d is inserted into the arm member 10 without being affected by the cast beam 22c when the connecting portion 22d is inserted into the cylinder of the arm member 10. However, in general, the smaller the product to be cast, the smaller and thinner the cast burr produced by casting. Thus, as necessarily casting burr 22c length L between the tip of the smaller than the outside diameter phi _S of the connecting portion 22 d, it is not necessary to form the relief portion 22e, a 22f. That is, the escape portions 22e and 22f may be formed to such an extent that the connection portion 22d can be inserted into the arm member 10 without being affected by the cast beam 22c.

For example, if the length L between the tip of the cast beams 22c is smaller than the inner diameter phi _H of the arm member 10, without being affected by the above-described embodiment and likewise cast beams 22c, the connection portion 22d arm member 10 Can be inserted in. It is also possible length L between the tip of the cast beams 22c forms a somewhat larger as the relief portion 22e, 22f than the inner diameter phi _H of the arm member 10. In this case, the connecting portion 22d is inserted into the cylinder of the arm member 10 while part of the cast beam 22c generated in the connecting portion 22d is broken at the insertion port of the arm member 10.

  Moreover, in the said embodiment, although the arm member 10 and the ball joints 20 and 30 were connected by press work, if it is the connection method which can connect the arm member 10 and the ball joints 20 and 30, it will be limited to this. It is not a thing. For example, the arm member 10 and the ball joints 20 and 30 may be connected by welding. Also by this, the arm member 10 and the ball joints 20 and 30 can be connected.

  Moreover, in the said embodiment, although the bearing member 22 was comprised with the aluminum alloy, if it can shape | mold by the manufacturing method using a type | mold, for example, casting, forging, etc., other materials, for example, steel materials, stainless steel materials, resin materials, etc. It may be. Also by this, the same effect as the above-mentioned embodiment can be expected.

  Moreover, in the said embodiment, although this invention was applied about the connection of the arm member 10 and the ball joints 20 and 30 in the stabilizer link SL, it is not limited to this. The present invention can be widely applied to a connection method in which a shaft formed by casting or forging using a die is inserted into a cylinder and fixed. For example, the present invention can be applied to a suspension arm used for a suspension mechanism of an automobile, a tie rod end used for a steering mechanism, a rack end, an inner ball joint used for these. Further, the present invention can be applied to fields other than automobiles, for example, various parts constituting various robots and various parts constituting toys such as plastic models. Furthermore, the present invention can be widely applied as an invention of a composite member connected by the connection method and a manufacturing method of the composite member.

It is a front view which shows the whole stabilizer link produced using the connection method which concerns on one Embodiment of this invention. (A) is a top view which shows the ball joint of the stabilizer link of FIG. 1, (B) is a partially broken front view which shows the ball joint. (A) is a top view which shows the bearing member of the stabilizer link of FIG. 1, (B) is a front view which shows the same bearing member, (C) is a right view which shows the same bearing member. (A), (B) is explanatory drawing which shows the state which inserts a ball joint in an arm member and press-processes an arm member and a ball joint, (A) is a partially broken top view, (B ) Is a partially broken front view. (A)-(C) are explanatory drawings which show the state which pressed the arm member and the ball joint, (A) is a partially broken plan view, (B) is a front view, (C ) Is an AA cross-sectional view shown in FIG. It is a modification of the present invention, and is a sectional view showing a state in which an arm member and a bearing member are pressed using two press dies. It is another modification of this invention, and is sectional drawing which shows the state which presses an arm member and a bearing member using two press type | molds.

Explanation of symbols

SL ... Stabilizer link, 10 ... Arm member, 20, 30 ... Ball joint, 21 ... Ball stud, 22 ... Bearing member, 22a ... Socket part, 22b ... Shaft part, 22c ... Casting, 22d ... Connection part, 22e, 22f ... relief part, 23 ... bearing sheet, 24 ... plug, 25 ... dust cover, 40, 50 ... press die, 41, 51 ... press surface, 42, 52 ... outer peripheral press surface, 43, 53 ... caulking convex part.

Claims (11)

A shaft portion formed in a shaft shape is inserted into a second member formed by casting or forging using a die in a cylindrical tube portion formed in the first member, and the first member and the In the member connection method for connecting the second member,
A relief portion having a shape recessed along the beam is formed on the surface of the shaft portion of the second member, where a beam is generated by the casting or forging ,
The first member and the second member are formed by plastically deforming the cylindrical portion into which the shaft portion is inserted using a press die formed in a shape corresponding to the shape of the relief portion. member connection method, characterized in that the connection. In the member connection method according to claim 1,
A member connecting method in which the escape portion is formed in a planar shape. In the member connection method according to claim 1 or 2,
The mold used for the casting or forging is composed of two or more molds,
The member connection method which formed the said relief part in the surface of the said axial part corresponding to the boundary part which combined the said 2 or more type | mold mutually. In the member connection method according to claim 1 or 2,
The member connection method which formed the said relief part in the surface of the said axial part corresponding to the gate part in the said casting. In the member connection method according to any one of claims 1 to 4,
The member connection method which presses the said cylinder part surface corresponding to the said escape part formed in the said axial part, and performs the said press work . A shaft portion formed in a shaft shape is inserted into a second member formed by casting or forging using a die in a cylindrical tube portion formed in the first member, and the first member and the In the composite member connecting the second member,
On the surface of the shaft portion of the second member, a relief portion having a shape recessed along the beam is formed in a portion where the beam is generated by the casting or forging ,
The first member and the second member are formed by plastically deforming the cylindrical portion into which the shaft portion is inserted using a press die formed in a shape corresponding to the shape of the relief portion. A composite member characterized by being connected . The composite member according to claim 6 ,
A composite member in which the escape portion is formed in a planar shape. In the composite member according to claim 6 or 7 ,
The mold used for the casting or forging is composed of two or more molds,
The composite member which formed the said relief part in the surface of the said axial part corresponding to the boundary part which combined the said 2 or more type | mold mutually. In the composite member according to claim 6 or 7 ,
The composite member which formed the said relief part in the surface of the said axial part corresponding to the gate part in the said casting. In the composite member according to any one of claims 6 to 9,
The composite member which presses the said cylinder part surface corresponding to the said escape part formed in the said shaft part, and performs the said press work . A shaft portion formed in a shaft shape is inserted into a second member formed by casting or forging using a die in a cylindrical tube portion formed in the first member, and the first member and the In the manufacturing method of the composite member connected to the second member,
A relief portion having a shape recessed along the beam is formed on the surface of the shaft portion of the second member, where a beam is generated by the casting or forging,
The first member and the second member are formed by plastically deforming the cylindrical portion into which the shaft portion is inserted using a press die formed in a shape corresponding to the shape of the relief portion. A method for producing a composite member, characterized by being connected.

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