JP6305846B2 - Attachment component, attachment of construction machine equipped with the same, and method of manufacturing attachment - Google Patents

Description

  The present invention relates to an attachment that is detachably attached to a body of a construction machine.

  Conventionally, attachments that extend in the axial direction and have a closed cross section in a direction orthogonal to the axial direction are known.

  The attachment includes a pair of side plates extending in the axial direction and facing in a direction orthogonal to the axial direction, a first connecting member for connecting the first edges of the side plates, and a second side opposite to the first edge. And a second connecting member for connecting the edges.

  In this type of attachment, the side plates are divided into a plurality of side plate pieces in the axial direction for the purpose of securing the strength and rigidity of the attachment and reducing the weight of the attachment, and these side plate pieces are welded together to form the side plates. Manufactured.

  For example, a boom (attachment) described in Patent Document 1 includes a pair of left and right web plates (side plates) extending in the axial direction, and upper and lower flange plates (first and second connecting members). . Each of the web plates is constituted by first to fifth web members (side plate pieces) welded in the axial direction.

  Moreover, the boom described in Patent Document 1 is manufactured by the following method.

  First, a web board is manufactured by sequentially butting the first to fifth web members in the axial direction. A pair of web plates manufactured in this way is prepared, and the upper flange plate is welded to the upper edge portion of the web plates so that the web plates are connected with the pair of web plates facing each other. Next, the lower flange plate is welded to the lower edge of the web plate so as to connect the web plates.

  However, when manufacturing a side plate by welding a plurality of side plate pieces as described above, the fatigue strength in the vicinity of the toe portion of the welded portion in the side plate piece is reduced, and when the attachment is deformed, particularly in the direction orthogonal to the axial direction There is a problem that the strength of the attachment is insufficient during bending deformation.

  In order to solve this, a peening process may be performed on the side plate pieces after welding in order to improve fatigue strength. The peening process is a process for introducing compressive residual stress to the side plate pieces.

International Publication No. 2012/144037

  Here, as described above, the first connecting member and the second connecting member are then welded to the side plates subjected to the peening process.

  The heat at the time of welding is transmitted to a range in the vicinity of the first connecting member or the second connecting member in the side plate piece, and the side plate piece is annealed by this heat, so that the compressive residual stress introduced into the side plate piece is reduced. It will be released.

  In this case, the effect of improving the fatigue strength by the peening process disappears from the side plate piece, and the strength of the side plate is lowered.

  The objective of this invention is providing the attachment structural member which can suppress the intensity | strength fall of the side plate at the time of welding of a connection member, the attachment of a construction machine provided with the same, and the manufacturing method of an attachment.

  In order to solve the above-described problems, the present invention provides a pair of side plates that extend in the axial direction and face each other in a facing direction orthogonal to the axial direction, and the side plates in the axial direction orthogonal to the axial direction and the facing direction. A first connecting member that connects the first edges, and a second connecting member that connects the second edges of the side plate on the opposite side of the first edge in the direction perpendicular to the axis. An attachment component for manufacturing an attachment for a construction machine extending in a direction and having a closed cross section in a direction orthogonal to the axial direction, and welded to each other in the axial direction via a welding line to form the side plate A pair of side plate pieces, and a first connection piece welded to an end face of the first edge portion of both side plate pieces in a state of being overlapped with the weld line in order to constitute a part of the first connection member. Equipped on both sides A peening process part is formed in at least one of the pieces along the weld line, and the first connecting member main body for constituting a portion other than the first connecting piece of the first connecting member is the first connecting member. It has a first fitted portion that penetrates the connecting member body in the direction perpendicular to the axis and can be fitted to the first connecting piece, and the first connecting piece is fitted to the first fitted portion. In this state, the first connecting piece is welded to the end face of the first edge portion of the both side plate pieces, and the first connecting piece is fitted in the first fitted portion with the first connecting piece. 1 has a first contact surface that can contact the first inner surface of the first connecting member body surrounding the fitted portion, and the temperature of the side plate is 400 ° C. during welding of the first contact surface and the first inner surface. It has a size that allows the peening processing unit to be arranged in a region that becomes the following: To provide a touch instrument components.

The present invention also includes a pair of side plates extending in the axial direction and facing a facing direction orthogonal to the axial direction, and the first edges of the side plates in the axial direction orthogonal to the axial direction and the facing direction. A first connecting member to be connected; and a second connecting member for connecting second edges of the side plates opposite to the first edge in the direction perpendicular to the axis and extending in the axial direction and the shaft. A method for manufacturing an attachment for a construction machine having a closed cross section in a direction orthogonal to the direction, wherein a pair of side plate pieces for forming the side plate is welded in the axial direction along a welding line. And a first step of welding the first connecting piece to the end face of the first edge of the both side plate pieces in a state where the first connecting piece for constituting a part of the first connecting member is overlapped with the welding line. Connection piece welding step and the first connection piece After the contact step, a processing construction forming a peening unit along said weld line to at least one of said side plates piece, after the processing construction step, the first connection piece of the first connecting member The both sides of the first connecting member main body for constituting a portion other than the first connecting member are fitted so that the first connecting piece is fitted to a first fitted portion that penetrates the first connecting member main body in the direction perpendicular to the axis. A first positioning step of positioning with respect to the first connecting piece welded to the plate pieces, and the first positioning step with respect to the end surfaces of the first edge portions of the side plate pieces in a state in which the first positioning step is performed. The first inner surface of the first connecting member body surrounding the first fitted portion and the first body in a state where the first main body welding step of welding the first connecting member main body and the first positioning step are performed. Welding the first contact surface of the first connecting piece that contacts the inner surface Including a first contact surface welding step, and in the first connecting piece welding step, the peening treatment portion can be arranged in a region where the temperature is 400 ° C. or lower in the side plate during the first contact surface welding step. There is provided a method for manufacturing an attachment for a construction machine using the first connecting piece having a thickness.

  According to the present invention, the first connecting member is divided into the first connecting piece and the first connecting member main body, and the first connecting piece is welded to the side plate piece prior to the welding of the first connecting member main body. . Thereby, welding of the 1st connection member (1st connection piece) vicinity of a weld line can be completed before a peening process. And an attachment structural member is manufactured by performing a peening process to at least one of the both-sides board piece to which the 1st connection piece was welded.

  Here, a 1st connection piece has a magnitude | size which can arrange | position a peening process part in the area | region where the temperature at the time of welding with a 1st contact surface and a 1st inner surface becomes 400 degrees C or less. That is, the temperature at which the peening treatment section rises due to the heat from the closest welding location among the welding locations of the first connecting member main body with respect to the attachment constituent member can be suppressed to 400 ° C. or less.

  As shown in FIG. 7, it has been confirmed that the effect of the peening treatment rapidly decreases when the temperature of the peening treatment portion exceeds 400 ° C. in the side plate during welding of the first connecting member main body.

  Therefore, according to the present invention, it is possible to improve the fatigue strength of the side plate at the welded portion between the side plate pieces by the peening treatment portion, and to suppress the improvement effect of this fatigue strength from being reduced during welding of the first connecting member. can do.

  Here, the intersecting portion of the first contact surface that intersects the virtual axis parallel to the axial direction at the viewpoint in the direction orthogonal to the axis may be orthogonal to the virtual line. In this case, the first connecting member is orthogonal to the first connecting member. When a bending force in the direction is applied, a large stress is generated in the direction orthogonal to the weld line at the welded portion between the intersecting portion and the first inner surface. Therefore, it is difficult to ensure the strength of the weld.

  Therefore, in the attachment component member, it is preferable that an intersecting portion of the first contact surface that intersects a virtual axis parallel to the axial direction at a viewpoint in the axis orthogonal direction is inclined with respect to the virtual axis. .

  Further, in the attachment manufacturing method, in the first connecting piece welding step, an intersection portion of the first contact surface that intersects the virtual axis parallel to the axial direction at the viewpoint of the axis orthogonal direction is the virtual axis. Preferably, the first connecting piece is welded to the both side plate pieces so as to be inclined with respect to the two side plate pieces.

  According to these aspects, even when a bending force in the direction perpendicular to the axis is applied to the first connecting member after welding the first connecting piece and the first connecting member main body, the intersection portion and the first inner surface The stress component generated in the direction perpendicular to the weld line with respect to the welded portion can be reduced. Therefore, it is possible to sufficiently ensure the welding strength between the first connecting piece and the first connecting member main body.

  Specifically, the angle of the intersecting portion with respect to the virtual axis at the viewpoint in the axis orthogonal direction can be set to 45 ° or less.

  As a result, compared to the case where the intersecting portion is orthogonal to the virtual axis, the stress component acting in the direction orthogonal to the weld line on the welded portion between the intersecting portion and the first inner surface is about 70% (1 / √2 ) Can be reduced to the following (relatively, the strength of the weld can be at least 1.4 times).

  “An angle of the intersecting portion with respect to the virtual axis” means an inferior angle, and “45 ° or less” means that when the intersecting portion is curved or bent, the maximum angle with respect to the virtual axis at the intersecting portion is 45 ° or less. It means that there is.

  Here, the first fitted portion may be a hole penetrating the first connecting member in the direction perpendicular to the axis. In this case, the first connecting piece is passed through the first fitting portion in the direction perpendicular to the axis. In addition, it is necessary to position the first connecting piece and the first connecting member main body, and the positioning work becomes complicated.

  Therefore, in the attachment component member, the first fitted portion is a groove that opens on an end surface in the opposing direction of the first connecting member main body, and the first connecting piece is in the first fitted portion. It preferably has a shape that can be inserted in the opposite direction.

  Further, in the attachment manufacturing method of the construction machine, the first fitted portion is a groove that opens on an end surface in the facing direction of the first connecting member body, and in the first connecting piece welding step, It is preferable to use the first connecting piece having a shape that can be inserted into the fitted portion in the facing direction.

  According to these aspects, since the first connecting piece can be inserted into the first fitted portion in the opposing direction, the first connected piece is first compared to the case where the first fitted portion is configured by the through hole. Positioning work between the connecting piece and the first connecting member main body is facilitated.

  The attachment component member further includes a second connection piece welded to an end surface of the second edge of the both side plate pieces in a state of being overlapped with the weld line in order to constitute a part of the second connection member. The second connecting member main body for constituting a portion of the second connecting member other than the second connecting piece penetrates the second connecting member main body in the direction perpendicular to the axis and is fitted with the second connecting piece. A second mating portion that can be mated, and welded to an end surface of the second edge of each side plate piece in a state in which the second connecting piece is fitted to the second mating portion. And the second connecting piece contacts the second inner surface of the second connecting member body surrounding the second fitted portion in a state where the second connecting piece is fitted to the second fitted portion. And having a possible second contact surface and in the side plate during welding of the second contact surface and the second inner surface Degree is preferably has a size capable of disposing the peening unit in a region to be a 400 ° C. or less.

Further, in the method for manufacturing an attachment of the construction machine, the second connection in a state where a second connection piece for constituting a part of the second connection member is overlapped on the weld line before the processing construction step. After the second connecting piece welding step of welding the piece to the end face of the second edge of the both side plate pieces, and the processing construction step, in order to configure a portion other than the second connecting piece of the second connecting member. The second connecting member main body is fixed to the both side plate pieces so that the second connecting piece is fitted to a second fitted portion that penetrates the second connecting member main body in the direction perpendicular to the axis. A second positioning step of positioning with respect to the second connecting piece, and the second connecting member main body is welded to the end surface of the second edge of the both side plate pieces in a state where the second positioning step is performed. A state in which the second main body welding step and the second positioning step are performed A second contact surface welding step of welding the second inner surface of the second connecting member main body surrounding the second fitted portion and the second contact surface of the second connecting piece in contact with the second inner surface. And in the second connecting piece welding step, the second connecting piece having a size capable of arranging the peening treatment portion in a region where the temperature is 400 ° C. or lower in the side plate during the second contact surface welding step. Is preferably used.

  According to these aspects, it is possible to suppress a reduction in fatigue strength of the side plate due to the peening treatment portion not only when welding the side plate and the first connecting member but also when welding the side plate and the second connecting member.

  Therefore, the strength reduction of the side plate at the time of welding the first connecting member and the second connecting member can be reliably suppressed.

  The present invention also includes a pair of side plates extending in the axial direction and facing a facing direction orthogonal to the axial direction, and the first edges of the side plates in the axial direction orthogonal to the axial direction and the facing direction. A first connecting member to be connected; and a second connecting member for connecting second edges of the side plates opposite to the first edge in the direction perpendicular to the axis and extending in the axial direction and the shaft. An attachment for a construction machine having a closed cross section in a direction perpendicular to the direction, the attachment having the attachment component described above as a part of the attachment.

  According to the present invention, it is possible to suppress a reduction in the strength of the side plate during welding with the connecting member.

1 is a side view showing an overall configuration of a hydraulic excavator according to a first embodiment of the present invention. It is a side view of the boom shown in FIG. It is the III-III sectional view taken on the line of FIG. It is an enlarged view of the IV section of FIG. It is the VV sectional view taken on the line of FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. It is a graph which shows the ratio of the hardness of the side plate in the peening process part after welding of the connection piece and the connection member main body with respect to the hardness of the side plate in the peening process part before welding of a connection member main body. It is a perspective view for demonstrating the manufacturing method of a boom, and shows a side-plate piece and a 1st connection piece. It is a perspective view for demonstrating the manufacturing method of a boom, and shows the state which the boom structural member and the 1st connection member main body isolate | separated. It is a perspective view for demonstrating the manufacturing method of a boom, and shows the state which the boom structural member and the 1st connection member main body isolate | separated. It is FIG. 5 equivalent view of the boom which concerns on 2nd Embodiment of this invention. FIG. 6 is a view corresponding to FIG. 5 of a boom according to a third embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The following embodiments are examples embodying the present invention, and are not of a nature that limits the technical scope of the present invention.

<First Embodiment (FIGS. 1 to 7)>
Referring to FIG. 1, a hydraulic excavator 1 according to an embodiment of the present invention includes a lower traveling body 2 having a pair of crawlers 2 a, an upper revolving body 3 provided on the lower traveling body 2 so as to be pivotable, And a work machine 4 attached to the swivel body 3 so as to be displaceable.

  The work machine 4 includes a boom (attachment) 5 that is attached to the upper swing body 3 so as to be able to be raised and lowered, an arm 6 that is rotatably attached to the tip of the boom 5, and a tip of the arm 6. And a bucket 7 attached rotatably.

  The work implement 4 also rotates a boom cylinder 8 that drives the boom 5 up and down relative to the upper swing body 3, an arm cylinder 9 that rotates the arm 6 relative to the boom 5, and a bucket 7 that rotates relative to the arm 6. And a bucket cylinder 10 to be driven.

  2 and 3, the boom 5 extends in the axial direction D1 and has a closed cross section in a direction orthogonal to the axial direction D1. The axial direction D1 is a direction along an axis passing through the center of the height range of the boom 5 (a range between a first connecting member 12 and a second connecting member 13 described later) in a side view (FIG. 2). is there.

  Specifically, the boom 5 includes a pair of side plates 11 extending in the axial direction D1 and facing the facing direction D2 orthogonal to the axial direction D1, and the side plates 11 in the axial orthogonal direction D3 orthogonal to the axial direction D1 and the facing direction D2. The first connecting member 12 that connects the first edges (the lower edge in the figure) and the second edges (the upper edge in the figure) of the side plate 11 opposite to the first edge in the axis orthogonal direction D3. Are connected to each other, a boss 14 for attaching the distal end portion of the boom cylinder 8, and a bracket 15 for attaching the proximal end portion of the arm cylinder 9.

  The boss 14 is fixed (welded) to the side plates 11 with the boss 14 penetrating the side plates 11. The bracket 15 is fixed (welded) to the outer surface of the second connecting member 13. The boss 14 is provided at a position closer to the base end side of the boom 5 than the bracket 15 in the axial direction D1.

  Since the side plates 11 have the same configuration, only one side plate 11 will be described below, and description of the other side plate 11 will be omitted. Moreover, since the part welded to said one side plate 11 among the 1st connection members 12 and the part welded to said other side plate 11 have the same structure, hereafter, among the 1st connection members 12, the said Only the portion welded to one side plate 11 will be described.

  As shown in FIG. 2, the side plate 11 includes four side plate pieces 16 to 19 welded in the axial direction D1.

  The side plate pieces 16 to 19 are arranged in a line along the axial direction D1, and the adjacent side plate pieces 16 to 19 are welded to each other. Specifically, the distal end portion of the side plate piece 16 and the proximal end portion of the side plate piece 17 are butt welded to each other, and the distal end portion of the side plate piece 17 and the proximal end portion of the side plate piece 18 are butt welded to each other. The distal end portion and the base end portion of the side plate piece 19 are butt welded to each other. A boundary line (welding line W <b> 1) between the side plate piece 16 and the side plate piece 17 is provided at a position closer to the base end side than the boss 14 in the boom 5. A boundary line (welding line W <b> 2) between the side plate piece 17 and the side plate piece 18 is provided at a position on the tip side of the boss 14 in the boom 5. The boundary line (weld line W3) between the side plate piece 18 and the side plate piece 19 is provided at a position on the tip side of the weld line W2 in the boom 5. Hereinafter, the structure regarding the welding line W1 mainly among the welding lines W1-W3 is demonstrated.

  4 and 5, the side plate pieces 16, 17 have substantially the same thickness. Peening treatment parts R1, R3 are provided along the weld line W1 on both the front and back surfaces of the side plate piece 16. Similarly, peening processing parts R <b> 2 and R <b> 4 are provided on both front and back surfaces of the side plate piece 17. The peening treatment portions R1 to R4 are portions formed by introducing compressive residual stress to the side plate pieces 16 and 17 in order to improve the fatigue strength of the side plate pieces 16 and 17.

  The first connecting member 12 is welded to the end faces of the first edge portions (lower edge portions in the drawing) of the side plate pieces 16 and 17 in a state where the first connecting member 12 is superimposed on the welding line W1 from below, A first connecting member main body 21 welded to the end faces of the first edge portions of the side plate pieces 16 and 17 in a state of being fitted to the one connecting piece 20 is provided.

  FIG. 8 is a perspective view showing the first connecting piece 20 and the side plate pieces 16 and 17 separately. FIGS. 9 and 10 show the first connecting member 12 and the first connecting member main body in FIGS. FIG.

  As shown in FIGS. 8 to 10, the first connecting piece 20 is a plate member having a shape that can be fitted to a first fitted portion 21 e of the first connecting member main body 21 described later. Specifically, the first connecting piece 20 has an outer surface 20a facing outward in the facing direction D2, an inner surface 20b facing inward of the facing direction D2, and an inclination provided between the outer surface 20a and the inner surface 20b. And surfaces 20c and 20d. The inner side surface 20b and the inclined surfaces 20c and 20d correspond to first contact surfaces (hereinafter also referred to as first contact surfaces 20b to 20d).

  The outer side surface 20a and the inner side surface 20b extend substantially parallel to the axial direction D1.

  On the other hand, as shown in FIG. 5, the inclined surfaces 20c and 20d are intersecting portions that intersect the virtual axis parallel to the axial direction D1 at the viewpoint of the axis orthogonal direction D3, and are inclined with respect to the virtual axis. . Specifically, the inclined surface 20c extends toward the base end side in the axial direction D1 as it goes outward in the facing direction D2. On the other hand, the inclined surface 20d extends toward the distal end side in the axial direction D1 as it goes outward in the facing direction D2. The inclined surface 20c and the inclined surface 20d are axisymmetric with respect to a straight line passing through the midpoint of the inner surface 20b and parallel to the opposing direction D2 at the viewpoint of the axis orthogonal direction D3 (FIG. 5). Moreover, the angle (subordinate angle) with respect to the virtual axis parallel to the axial direction D1 of the inclined surfaces 20c, 20d is set to about 40 °.

  With reference to FIG.9 and FIG.10, the 1st connection member main body 21 penetrates the said 1st connection member main body 21 in the axis orthogonal direction D3, and is a 1st to-be-fitted part which can be fitted with the 1st connection piece 20. FIG. 21e is a plate member. The first fitted portion 21e is a groove that opens on the end surface of the first connecting member main body 21 in the facing direction D2. Specifically, the first connecting member main body 21 includes an outer surface (end surface) 21a in the facing direction D2, an inner surface 21b surrounding the first fitted portion 21e, inclined surfaces 21c and 21d (first inner surface: hereinafter, first 1 inner surfaces 21b to 21d).

  The outer side surface 21a and the inner side surface 21b extend substantially parallel to the axial direction D1. The length of the inner side surface 21b in the axial direction D1 is substantially the same as the length of the inner side surface 20b of the first connecting piece 20 in the axial direction D1.

  On the other hand, the inclined surfaces 21c and 21d are inclined with respect to a virtual axis parallel to the axial direction D1 at the viewpoint of the axial orthogonal direction D3 as shown in FIG. Specifically, the inclined surface 21 c extends substantially parallel to the inclined surface 20 c of the first connecting piece 20. On the other hand, the inclined surface 21 d extends substantially parallel to the inclined surface 20 d of the first connecting piece 20. That is, the 1st connection piece 20 has a shape which can be inserted in the opposing direction D2 in the 1st to-be-fitted part 21e. In a state where the first connecting piece 20 is inserted into the first fitted portion 21e, the outer surface 20a of the first connecting piece 20 and the outer surface 21a of the first connecting member main body 21 are arranged on the same plane.

  Hereinafter, the welding location between the side plate 11 and the connecting member 12 will be described.

  As shown in FIGS. 3 and 4, the end surface of the first edge portion of the side plate 11 is welded to the surface (upper surface) of the first connecting member main body 21 by the fillet welded portion W <b> 4 provided outside the facing direction D <b> 2. ing. In addition, the end surface of the 2nd edge part of the side plate 11 is welded to the surface (lower surface) of the 2nd connection member 13 by the fillet weld part W5 provided in the outer side of the opposing direction D2.

  On the other hand, as shown in FIGS. 5, 6, 9, and 10, the end surface of the first edge of the side plate 11 is a first connecting piece by fillet welds W <b> 6 and W <b> 7 provided on both sides in the facing direction D <b> 2. It is welded to 20 surfaces.

  4 and 5 show the state in which the fillet welded portion W4 and the fillet welded portion W6 are separated for convenience of explanation, both welded portions W4, W6 are on the inclined surfaces 20c, 20d. It is preferable that they are connected to each other. Similarly, FIG. 5 shows a state in which the fillet weld W7 is separated from the inclined surfaces 20c and 20d, but the fillet weld W7 preferably extends to the inclined surfaces 20c and 20d. These points are the same in FIGS. 9 to 12.

  And as shown in FIG. 5, the 1st connection piece 20 and the 1st connection member main body 21 are butt-welded mutually along the 1st contact surfaces 20b-20d (1st inner surfaces 21b-21b). That is, the first connecting piece 20 and the first connecting member main body 21 are in a state where the first contact surfaces 20b to 20d and the first inner surfaces 21b to 21d are in contact (the first connecting piece 20 is in contact with the first fitted portion 21e. In a fitted state).

  Here, heat at the time of welding of the first contact surfaces 20 b to 20 d and the first inner surfaces 21 b to 21 d is transmitted to a range in the side plate 11 in the vicinity of the first connection piece 20. When this heat reaches a predetermined temperature or more, the effect of improving the fatigue strength of the side plate 11 by the peening treatment parts R1 to R4 is rapidly reduced. Hereinafter, with reference to FIG. 7, the thermal influence with respect to peening process part R1-R4 is demonstrated.

  FIG. 7 is a graph showing a ratio of the hardness of the side plate 11 in the peening treated portion after welding of the connecting piece and the connecting member main body to the hardness of the side plate 11 in the peening treated portion before welding of the connecting piece and the connecting member main body. is there. Since the hardness and fatigue strength are generally proportional except for high-strength steel, the fatigue strength ratio of the side plate 11 can be confirmed by comparing the hardness of the side plate 11 in FIG.

  In FIG. 7, the hardness of the side plate 11 in the peening processing part before welding between the connecting piece and the connecting member main body is set as a reference (100%). The hardness of the side plate 11 in the peening treatment portion is improved by about 5% with respect to the hardness of the side plate 11 before the peening treatment.

  Moreover, the hardness of the side plate 11 in the peening treatment portion that is 100 ° C. or more and 400 ° C. or less when the connection member body is welded to the connection piece is equal to or higher than the hardness of the side plate 11 in the peening treatment portion before welding between the connection piece and the connection member body. Maintains hardness. Here, the hardness of the side plate 11 in the peening treatment part that is 200 ° C. or more and 400 ° C. or less when the connection piece and the connection member main body are welded is the hardness of the side plate 11 in the peening treatment part before welding of the connection piece and the connection member main body. The reason for exceeding is considered to be because strain aging occurs in the side plate 11.

  On the other hand, the hardness of the side plate 11 in the peening treatment portion that is 500 ° C. or higher when welding the connection piece and the connection member main body is lower than the hardness of the side plate 11 in the peening treatment portion before welding between the connection piece and the connection member main body. ing.

  Therefore, the first connecting piece 20 is heated at the side plate 11 when the first connecting piece 20 and the first connecting member main body 21 are welded (when the first contact surfaces 20b to 20d and the first inner surfaces 21b to 21d are welded). Has such a size that the peening treatment parts R1 to R4 can be arranged in a region where the temperature becomes 400 ° C. or lower.

  Specifically, as shown in FIG. 5, the welded portion (weld line W1) between the side plate pieces 16 and 17 is the center position in the axial direction D1 of the first connecting piece 20 and the outer side surface 20a in the facing direction D2. Rather than the inner surface 20b. Therefore, the peening processing units R1 to R4 that are closest to the first contact surfaces 20b to 20d are the inner peening processing units R3 and R4. Therefore, the shortest distance D4 from the peening processing portions R3 and R4 to the first contact surfaces 20b to 20d (inclined surfaces 20c and 20d in the first embodiment) is the first contact surfaces 20b to 20d and the first inner surfaces 21b to 21d. The temperature of the peening processing parts R3 and R4 is set to be 400 ° C. or lower during welding. The shortest distance D4 is set to 10 mm or more. In addition, illustration about the shortest distance D4 with respect to the peening process part R4 is abbreviate | omitted.

  Hereinafter, the manufacturing method of the boom 5 mentioned above is demonstrated.

  First, as shown in FIG. 2, the side plate pieces 16 to 19 are welded in the axial direction D1 along the weld lines W1 to W3 (side plate piece welding step).

  Next, as shown by an arrow Y1 in FIG. 8, the first connecting piece 20 is superimposed on the weld line W1 from below, and in this state, the first connecting piece 20 is placed on the end face of the first edge of the side plate pieces 16, 17. On the other hand, welding is performed by fillet welds W6 and W7 (see FIGS. 9 and 10) (first connecting piece welding step).

  Here, in order to form a closed cross-section by the side plates 11, the first connecting member 12, and the second connecting member 13, the positional relationship between the side plates 11, the first connecting member 12, and the second connecting member 13 (hereinafter referred to as the closed). The positional relationship for forming the cross section is set in advance. In the first connecting piece welding step, the side plate 11 and the first connecting piece 20 are assembled so that the side plates 11, the first connecting member 12, and the second connecting member 13 can be assembled in a positional relationship for forming a closed cross section. Position and weld both in this state. In this embodiment, the 1st connection piece 20 is welded to the side plate 11 in the state positioned with respect to the both-side plate pieces 16 and 17 so that the outer surface 20a and the inner surface 20b may be parallel to the axial direction D1. .

After the first connecting piece welding step, as shown in FIGS. 9 and 10, peening treatment portions R1 to R4 are formed along the weld line W1 on both side surfaces of the both side plate pieces 16 and 17 (processing construction step). .

  Thereby, while the peening process part R1-R4 is provided in the both-sides plate pieces 16 and 17, the attachment structural member 5A by which the 1st connection piece 20 was welded to this both-sides plate pieces 16 and 17 is manufactured.

Here, since welding of the 1st connection piece 20 of the welding line W1 vicinity was completed before the process construction process, the peening process parts R1-R4 are not received the heat influence at the time of the welding of the 1st connection piece 20. FIG.

After the processing construction step, the first connecting member main body 21 and the side plate 11 (first connecting member 20) are positioned so as to be in a positional relationship corresponding to the positional relationship for forming the closed section (first positioning step). ). Specifically, the first connecting member main body 21 and the side plate 11 are positioned so that the side plate 11 is disposed at a position on the first connecting member main body 21 indicated by a two-dot chain line in FIGS. Thereby, the 1st to-be-fitted part 21e of the 1st connection member main body 21 and the 1st connection piece 20 fit. In other words, in the first positioning step, as a result, the first connecting member main body 21 and the side plate 11 are positioned so that the first fitted portion 21e and the first connecting piece 20 are fitted.

  Here, since the 1st to-be-fitted part 21e has the inclined surfaces 21c and 21d which leave | separate mutually toward the outer side of the opposing direction D2, the 1st to-be-fitted part 20 is fitted to the 1st to-be-attached direction along the opposing direction D2. It can be easily inserted into the joint portion 21e.

  In the state where the first positioning step is performed, the first connecting member main body 21 is welded to the end surfaces of the first edge portions of the side plate pieces 16 and 17 by the fillet welded portion W4 (see FIG. 3) (first 1 body welding process).

  In the state where the first positioning step is performed, as shown in FIG. 5, the first contact surfaces 20b to 20d and the first inner surfaces 21b to 21d are welded (first contact surface welding step). As described above, the shortest distance D4 from the peening processing units R3, R4 to the first contact surfaces 20b-20d is the peening processing unit R3, R4 when welding the first contact surfaces 20b-20d and the first inner surfaces 21b-21d. Is set to 400 ° C. or lower. Therefore, the fatigue strength improvement effect by peening process part R1-R4 is not lost with the heat | fever at the time of a 1st contact surface welding process.

  The order of the first main body welding step and the first contact surface welding step may be reversed.

  And after the 1st connection member 12 is welded to the both-sides board 11, the 2nd connection member 13 is welded with the fillet weld part W5 (refer FIG. 3) with respect to the end surface of the 2nd edge part of the said both-sides board 11. . Thereby, the boom 5 which has the closed cross section in the direction orthogonal to the axial direction D1 while extending in the axial direction D1 can be manufactured.

  In addition, after welding the 2nd connection member 13 with respect to the both-sides board 11, you may weld the 1st connection member 12. FIG.

  As described above, the first connecting member 12 is divided into the first connecting piece 20 and the first connecting member main body 21 and the first connecting piece 20 is the side plate piece 16 prior to welding of the first connecting member main body 21. 17 is welded. Thereby, the welding of the 1st connection member 12 (1st connection piece 20) of the welding line W1 vicinity can be completed before a peening process. And an attachment structural member is manufactured by giving the peening process to the both-sides plate pieces 16 and 17 to which the 1st connection piece 20 was welded.

  Here, the 1st connection piece 20 can arrange | position the peening process parts R1-R4 in the area | region where the temperature at the time of welding with the 1st contact surfaces 20b-20d and the 1st inner surfaces 21b-21d becomes 400 degrees C or less. Have a size. That is, the temperature at which the peening treatment parts R1 to R4 rise due to the heat from the closest welded portion of the first connecting member main body 21 to the attachment constituent member can be suppressed to 400 ° C. or lower.

  As shown in FIG. 7, it has been confirmed that the effect of the peening treatment rapidly decreases when the temperature of the peening treatment portion exceeds 400 ° C. in the side plate 11 during welding of the first connecting member main body 21.

  Therefore, the fatigue strength of the side plate 11 can be improved at the welded portion between the side plate pieces 16 and 17 by the peening treatment portions R1 to R4, and the improvement effect of this fatigue strength is reduced during welding of the first connecting member 12. Can be suppressed.

  Moreover, according to 1st Embodiment, there can exist the following effects.

  In the first embodiment, of the first contact surfaces 20b to 20d, the inclined surfaces (intersection portions) 20c and 20d intersecting the virtual axis parallel to the axial direction D1 at the viewpoint in the axis orthogonal direction D3 (FIG. 5) are flexible axes. It is inclined with respect to.

  Thereby, when the bending force of the axis orthogonal direction D3 is applied to the 1st connection member 12 after the welding of the 1st connection piece 20 and the 1st connection member main body 21 (a tensile stress or a compressive stress is applied to the 1st connection member 12). Even if it occurs, the stress component generated in the direction perpendicular to the weld line with respect to the welded portions of the inclined surfaces 20c and 20d and the inclined surfaces 21c and 21d can be reduced. Therefore, the welding strength between the first connecting piece 20 and the first connecting member main body 21 can be sufficiently ensured.

  Specifically, the angle of the inclined surfaces 20c and 20d with respect to the virtual axis is set to 45 ° or less (about 40 °).

  Therefore, compared with the case where the inclined surfaces 20c and 20d are orthogonal to the virtual axis, the stress component generated in the direction orthogonal to the weld line is reduced with respect to the welded portion between the inclined surfaces 20c and 20d and the inclined surfaces 21c and 21d. It can be reduced to 70% (1 / √2) or less.

  Since the 1st connection piece 20 can be inserted in the opposing direction D2 in the 1st to-be-fitted part 21e, compared with the case where the 1st to-be-fitted part 21e is comprised by a through-hole, the 1st connection piece 20 And the positioning operation | work with the 1st connection member main body 21 becomes easy.

<Second Embodiment (FIG. 11)>
The first connecting piece 20 according to the first embodiment has inclined surfaces 20c and 20d that are symmetrical in the axial direction D1 at the viewpoint of the axis orthogonal direction D3 (FIG. 5), but the shape of the first connecting piece is this. It is not limited to. Hereafter, the part which is different from 1st Embodiment among 1st Embodiment is mainly demonstrated.

  The 1st connection piece 22 which concerns on 2nd Embodiment is a board member which has a shape which can be fitted to the 1st to-be-fitted part 24e of the 1st connection member main body 24 mentioned later. Specifically, the first connecting piece 22 includes an outer surface 22a facing outward in the axial direction D1, an inner surface 22b facing inward of the axial direction D1, and a virtual axis parallel to the axial direction D1 in the viewpoint of the axial orthogonal direction D3. Inclined surfaces 22c and 22d that are inclined with respect to each other. The inner side surface 22b and the inclined surfaces 22c and 22d correspond to the first contact surface.

  Unlike the first embodiment, the inclined surfaces 22c and 22d extend substantially parallel to each other. That is, the 1st connection piece 22 which concerns on 2nd Embodiment has a parallelogram shape in the viewpoint of the axis orthogonal direction D3.

  On the other hand, the first connecting member main body 24 is a plate member having a first fitted portion 24e that penetrates the first connecting member main body 24 in the axis orthogonal direction D3 and can be fitted to the first connecting piece 22. The first fitted portion 24e is a groove that opens on the end surface of the first connecting member main body 24 in the facing direction D2. Specifically, the first connecting member body 24 includes an outer surface (end surface) 24a in the facing direction D2, an inner surface 24b surrounding the first fitted portion 24e, and inclined surfaces 24c and 24d (first inner surface). ing.

  Unlike the first embodiment, the inclined surfaces 24 c and 24 d extend substantially parallel to the inclined surfaces 22 c and 22 d of the first connecting piece 22.

  Thus, even when the first connecting piece 22 has a parallelogram shape, the first fitting portion 24e that opens on the end surface in the facing direction D2 of the first connecting member main body 24 is formed to thereby form the first fitting portion 24e. The 1st connection piece 22 can be inserted in the opposing direction D2 in the to-be-fitted part 24e.

  In addition, in the 1st connection piece 20 of 1st Embodiment, the inner surface 20b can be abbreviate | omitted and the 1st connection piece which has the shape of a triangle where inclined surface 20c, 20d mutually cross | intersects can also be used.

<Third Embodiment (FIG. 12)>
In the embodiment, the first connecting piece having a polygonal shape has been described. However, as shown in FIG. 12, the first connecting piece 23 having the arc surface 23b at the viewpoint (FIG. 12) in the axis orthogonal direction D3 is used. You can also. In the following, different parts from the above embodiment will be mainly described.

  The 1st connection piece 23 is a board member which has a shape which can be fitted in the 1st to-be-fitted part 25c of the 1st connection member main body 25 mentioned later. Specifically, the 1st connection piece 23 has the outer surface 23a which faces the outer side of the opposing direction D2, and the circular arc surface 23b which faces the inner side of the opposing direction D2. The arc surface 23b corresponds to the first contact surface.

  The center position (not shown) of the arc surface 23b is set outside the outer surface 23a in the facing direction D2. Thereby, the 1st connection piece 23 has a shape which spreads toward the outer side of the opposing direction D2.

  On the other hand, the first connecting member main body 25 is a plate member that has a first fitted portion 25c that penetrates the first connecting member main body 25 in the axis orthogonal direction D3 and can be fitted to the first connecting piece 23. The first fitted portion 25c is a groove that opens on the end surface of the first connecting member body 25 in the facing direction D2. Specifically, the first connecting member main body 25 includes an outer surface (end surface) 25a in the facing direction D2 and an arcuate surface 25b surrounding the first fitted portion 25c.

  The arc surface 25b contacts the arc surface 23b of the first connecting piece 23 in a state where the outer surface 23a of the first connecting piece 23 and the outer surface 25a of the first connecting member body 25 are arranged on the same plane. That is, the center position (not shown) of the arc surface 25b is also set outside the outer surface 25a in the facing direction D2. Thereby, similarly to the 1st to-be-fitted part 21e of 1st Embodiment, the 1st to-be-fitted part 25c has a shape which spreads toward the outer side of the opposing direction D2. Therefore, the 1st connection piece 23 can be easily inserted in the 1st to-be-fitted part 25c along the opposing direction D2.

  In addition, this invention is not limited to embodiment mentioned above, For example, the following aspect can also be taken.

  In the above embodiment, the upper edge portion of the side plate 11 in the drawing is described as the first edge portion, and the lower edge portion of the side plate 11 in the drawing is described as the second edge portion. However, the orientation of the first edge portion and the second edge portion is as follows. It is not limited.

  However, if the connecting member welded to the edge located at least on the lower side of the side plate 11 is divided into the connecting piece and the connecting member main body, the following effects can be obtained.

  When excavation work is performed by the hydraulic excavator 1, the boom 5 is bent so that the tip of the boom 5 is displaced upward. Due to this bending deformation, a greater tensile stress is generated in the vicinity of the welded portion of the side plate 11 with the first connecting member 12 than in the vicinity of the welded portion of the side plate 11 with the second connecting member 13. In this case, the tensile stress works against the welded portion between the side plate pieces 16 to 19 and may shorten the life of the boom 5. Therefore, the first connecting member 12 welded to the lower side of the side plate 11 is divided into the first connecting piece 20 and the first connecting member main body 21, so that the lower end portion of the welding portion between the side plate pieces 16 to 19. The effect of improving the fatigue strength by the peening process can be surely exhibited. Therefore, the life of the boom 5 can be extended.

  The peening processing parts R1 to R4 are formed on both the side plate pieces 16 and 17 along the weld line W1, but may be provided on one of the side plate pieces 16 and 17. However, when the side plate pieces adjacent to each other have different thicknesses, it is preferable that the peening treatment portion is provided at least on the side plate pieces having a small thickness.

  Moreover, the location in which the peening process part is provided is not limited to the welding line W1, but can be provided in at least one of the side plate pieces 17 to 19 along at least one of the welding lines W1 to W3. In this case, at least one 1st connection piece can also be provided so that it may overlap with the welding lines W1-W3 in which the peening process part is provided.

  In the said embodiment, although the groove | channel opened on the end surface of the opposing direction D2 of the 1st connection member main body 21, 24, 25 was illustrated as 1st to-be-fitted part 21e, 24e, 25c, The hole which penetrates 1 connection member main body to the direction orthogonal to an axis D3 may be sufficient.

  In the said embodiment, about the structure by which the 1st connection member 12 welded to the 1st edge part of the side plate 11 is divided | segmented into the 1st connection piece 20,22,23 and the 1st connection member main body 21,24,25. Although described, the same configuration can be applied to the second connecting member 13.

  In this case, although not shown, the second connecting member 13 includes a second connecting piece corresponding to the first connecting piece and a second connecting member main body corresponding to the first connecting member main body. The second connecting member main body has a second fitted portion corresponding to the first fitted portion. On the other hand, the second connecting piece can be in contact with the second inner surface surrounding the second fitted portion of the second connecting member body in a state where the second connecting piece is fitted to the second fitted portion. Have Moreover, the 2nd connection piece has a magnitude | size which can arrange | position peening process part R1-R4 in the area | region where temperature becomes 400 degrees C or less in the side plate 11 at the time of welding with a 2nd contact surface and a 2nd inner surface.

When manufacturing the boom 5 which has this 2nd connection member 13, it is after the side plate pieces 16 and 17 are welded (after the side plate piece welding process), and before the formation of the peening processing parts R1 to R4 (before the processing construction process). In the stage, the second connecting piece is welded to both side plate pieces 16 and 17 (second connecting piece welding step). And after a process construction process, a 2nd connection member main body is positioned with respect to a 2nd connection piece so that a 2nd connection piece may fit in a 2nd to-be-fitted part (2nd positioning process). While the second positioning step is performed, the second connecting member main body is welded to the end faces of the second edge portions of the both side plate pieces 16 and 17 (second main body welding step), and the second inner surface and the second The contact surface is welded (second contact surface welding step).

  If it does in this way, not only at the time of welding with side plate 11 and the 1st connecting member 12, but also at the time of welding with side plate 11 and the 2nd connecting member 13, reduction of the fatigue strength of side plate 11 by peening process part R1-R4. Can be suppressed.

  Therefore, the strength reduction of the side plate 11 during welding of the first connecting member 12 and the second connecting member 13 can be reliably suppressed.

  Further, the attachment of the present invention is not limited to the boom 5. For example, the arm 6 can be manufactured as an attachment.

D1 Axis direction D2 Opposite direction D3 Axis orthogonal direction R1 to R4 Peening treatment part W1 Welding line (welding line between side plate pieces)
1 Hydraulic excavator (an example of construction machinery)
5 Boom (an example of an attachment)
DESCRIPTION OF SYMBOLS 11 Side plate 12 1st connection member 13 2nd connection member 16, 17 Side plate piece 20, 22, 23 1st connection piece 20b, 22b Inner side surface (an example of 1st contact surface)
20c, 20d, 22c, 22d Inclined surface (example of first contact surface)
21, 24, 25 First connecting member main body 21b, 24b Inner side surface (example of first inner surface)
21c, 21d, 24c, 24d Inclined surface (example of first inner surface)
21e, 24e, 25c 1st to-be-fitted part 23b Circular arc surface (an example of a 1st contact surface)
25b Arc surface (example of first inner surface)

Claims (11)

A pair of side plates that extend in the axial direction and face each other in a facing direction orthogonal to the axial direction, and a first connecting member that connects the first edge portions of the side plates in the axial direction and the axial orthogonal direction perpendicular to the facing direction. And a second connecting member that connects the second edges of the side plates opposite to the first edge in the direction perpendicular to the axis, and extends in the axial direction and is orthogonal to the axial direction. An attachment component for manufacturing an attachment for a construction machine having a closed section,
A pair of side plate pieces welded together in the axial direction via a weld line to constitute the side plate;
A first connection piece welded to an end surface of the first edge of each side plate piece in a state of being overlapped with the weld line to constitute a part of the first connection member;
At least one of the side plate pieces is formed with a peening treatment portion along the weld line,
A first connecting member main body for constituting a portion of the first connecting member other than the first connecting piece penetrates the first connecting member main body in the direction perpendicular to the axis and is fitted with the first connecting piece. A first fitted portion capable of being welded to the end face of the first edge portion of the both side plate pieces in a state where the first connecting piece is fitted to the first fitted portion. Yes,
The first connecting piece is capable of contacting a first inner surface of the first connecting member body surrounding the first fitted portion in a state where the first connected piece is fitted to the first fitted portion. An attachment configuration having one contact surface and a size capable of disposing the peening treatment portion in a region where the temperature is 400 ° C. or lower in the side plate during welding of the first contact surface and the first inner surface. Element.   The attachment constituent member according to claim 1, wherein an intersecting portion of the first contact surface that intersects a virtual axis parallel to the axial direction at a viewpoint in the direction orthogonal to the axis is inclined with respect to the virtual axis.   The attachment component according to claim 2, wherein an angle of the intersecting portion with respect to the virtual axis at a viewpoint in the axis orthogonal direction is 45 ° or less. The first fitted portion is a groove that opens on the end surface in the facing direction of the first connecting member main body,
4. The attachment component member according to claim 1, wherein the first connection piece has a shape that can be inserted into the first fitted portion in the facing direction. 5. The attachment component member further includes a second connection piece welded to an end surface of the second edge of the both side plate pieces in a state of being overlapped with the weld line in order to constitute a part of the second connection member. ,
The second connecting member main body for constituting a portion of the second connecting member other than the second connecting piece penetrates the second connecting member main body in the direction perpendicular to the axis and is fitted with the second connecting piece. A second fitted portion that is possible, and the second connecting piece is welded to the end face of the second edge portion of the both side plate pieces in a state of being fitted to the second fitted portion. Yes,
The second connecting piece is in contact with a second inner surface of the second connecting member main body surrounding the second fitted portion in a state where the second connected piece is fitted to the second fitted portion. 2. It has two contact surfaces, and has a size capable of disposing the peening treatment portion in a region where the temperature is 400 ° C. or lower in the side plate during welding of the second contact surface and the second inner surface. The attachment structural member of any one of 1-4. A pair of side plates that extend in the axial direction and face each other in a facing direction orthogonal to the axial direction, and a first connecting member that connects the first edge portions of the side plates in the axial direction and the axial orthogonal direction perpendicular to the facing direction. And a second connecting member that connects the second edges of the side plates opposite to the first edge in the direction perpendicular to the axis, and extends in the axial direction and is orthogonal to the axial direction. An attachment for a construction machine having a closed section,
The attachment of the construction machine provided with the attachment structural member of any one of Claims 1-5 as a part of said attachment. A pair of side plates that extend in the axial direction and face each other in a facing direction orthogonal to the axial direction, and a first connecting member that connects the first edge portions of the side plates in the axial direction and the axial orthogonal direction perpendicular to the facing direction. And a second connecting member that connects the second edges of the side plates opposite to the first edge in the direction perpendicular to the axis, and extends in the axial direction and is orthogonal to the axial direction. A method for manufacturing an attachment for a construction machine having a closed cross section, comprising:
A side plate piece welding step of welding a pair of side plate pieces for forming the side plate in the axial direction along a weld line;
First connection piece welding for welding the first connection piece to the end face of the first edge of both side plate pieces in a state where the first connection piece for constituting a part of the first connection member is overlapped on the welding line. Process,
After the first connecting piece welding step, a processing construction step of forming a peening treatment portion along the weld line with respect to at least one of the both side plate pieces;
After the processing construction step, a first connecting member main body for constituting a portion other than the first connecting piece of the first connecting member is passed through the first connecting member main body in the direction perpendicular to the axis. A first positioning step of positioning with respect to the first connecting piece welded to the both side plate pieces so that the first connecting piece is fitted to the fitted portion;
A first main body welding step of welding the first connecting member main body to an end surface of the first edge of the both side plate pieces in a state where the first positioning step is performed;
In a state where the first positioning step is performed, the first inner surface of the first connecting member body surrounding the first fitted portion and the first contact surface of the first connecting piece that contacts the first inner surface. A first contact surface welding process for welding
In the first connecting piece welding step, the first connecting piece having a size capable of arranging the peening treatment portion in a region where the temperature is 400 ° C. or lower in the side plate during the first contact surface welding step is used. Manufacturing method for construction machine attachments.
  In the first connecting piece welding step, the first contact surface is intersected with a virtual axis parallel to the axial direction at a viewpoint in the axis-orthogonal direction so that an intersecting portion is inclined with respect to the virtual axis. The manufacturing method of the attachment of the construction machine of Claim 7 which welds a connection piece to the said both-sides board piece.   The method for manufacturing an attachment for a construction machine according to claim 8, wherein an angle of the intersecting portion with respect to the virtual axis at a viewpoint in the axis orthogonal direction is 45 ° or less. The first fitted portion is a groove that opens on the end surface in the facing direction of the first connecting member main body,
The construction machine according to any one of claims 7 to 9, wherein, in the first connecting piece welding step, the first connecting piece having a shape that can be inserted into the first fitted portion in the facing direction is used. Method for manufacturing the attachment. Before the processing construction step, the second connecting piece for constituting a part of the second connecting member is overlapped with the weld line, and the second connecting piece is attached to the second edge of the both side plate pieces. A second connecting piece welding step of welding to the end face;
2nd which penetrates the said 2nd connection member main body for the said 2nd connection member main body for comprising parts other than the said 2nd connection piece among the said 2nd connection members after the said process construction process to the said axis orthogonal direction. A second positioning step of positioning with respect to the second connecting piece fixed to the both side plate pieces so that the second connecting piece is fitted to the fitted portion;
A second main body welding step of welding the second connecting member main body to the end surface of the second edge of the both side plate pieces in a state where the second positioning step is performed;
In a state where the second positioning step is performed, the second inner surface of the second connecting member body surrounding the second fitted portion and the second contact surface of the second connecting piece that contacts the second inner surface. A second contact surface welding process for welding
In the second connecting piece welding step, the second connecting piece having a size capable of arranging the peening treatment portion in a region where the temperature is 400 ° C. or lower in the side plate during the second contact surface welding step is used. The manufacturing method of the attachment of the construction machine of any one of Claims 7-10.

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