JP2009241771A - Axle spring seat for axle box support device and method of manufacturing therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axle spring seat for an axle box support device with a structure allowing manufacture by jointing of two aluminum members, and also to provide a method of manufacturing therefor. <P>SOLUTION: This axle spring seat is provided with the pipe-like first aluminum member 1 and the plate-like aluminum member 2 guiding a coil spring elastically supporting a truck frame, and the fitting surface between the first aluminum member 1 and the second one 2 are jointed by friction stir jointing. The fitting section 7 of the first aluminum member 1 is shaped in a flange to a pipe, and in the second aluminum member 2, a fitting hole section 9 allowing the fitting section 7 to be just fitted is formed. Since the fitting section 7 and the fitting hole section 9 are shaped in a staircase with a large diameter on its upper side and a small diameter on its lower side, a load in an axial direction acting on the first aluminum member 1 can be received. Since the position of a stir section 5 is vertically off inside and outside in a radial direction, the influence of the friction stir jointing is displaced in the radial direction, and the jointing strength is improved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a shaft spring seat for a shaft box support device that is installed in a railcar bogie and constitutes a shaft box support device that supports a bogie frame with respect to a wheel shaft, and a method for manufacturing the same.

  Conventionally, there is a cylindrical laminated rubber system using a coil spring as one of the cart shaft support systems of a cart. In this system, a shaft spring seat is used as a spring guide and rubber fixing part. In general, a shaft spring seat made of an aluminum alloy used in a wing spring type shaft box support device has recently been manufactured as a forged aluminum product in order to reduce the weight of the carriage.

  In aluminum forging, parts can be finished according to the shape of the mold, but when mass production is performed, the mold may be worn and the finished shape may change. In addition, if the shaft spring seat is manufactured by forging, it is not flexible enough to change the shape accompanying the change of the forging die, and cannot be handled quickly.

In addition, in the case of a small number of production such as a test product, if a forging die is newly produced by a new design, both the production cost and the production time increase. From the viewpoint of cost and time, it is difficult to make a new mold and make a test product with the mold. When a shaft spring seat manufactured with a conventional mold is used, there is a limit to the design change of the shaft box support device. By the way, as an example of the shaft spring seat, Patent Document 1 can be cited.
Japanese Examined Patent Publication No. 6-45342

  The present invention provides a shaft spring seat for a shaft box support device having a structure that enables manufacturing by joining two aluminum members by reviewing a conventional manufacturing method called forging by a metal mold, and a manufacturing method thereof.

  A shaft spring seat for a shaft box supporting device according to the present invention includes a first aluminum member having a pipe shape and a second aluminum member having a plate shape, and the fitting of the first aluminum member and the second aluminum member. The mating surfaces are joined by friction stir welding.

  In the method for manufacturing a shaft spring seat for a shaft box supporting device according to the present invention, the fitting surfaces of the pipe-shaped first aluminum member and the plate-shaped second aluminum member are joined by friction stir welding. is doing.

In the present invention, it is preferable that the fitting portion of the first aluminum member and the second aluminum member fitting hole are stepped. Due to such a structure in which the fitting portion and the fitting hole portion are stepped, the deviation of the dimension of each member is reduced. Further, by adopting step-like processing and joining the friction stir welding from the two directions of the upper surface and the lower surface, it is possible to prevent the dimensional deviation and the bonding failure at the time of bonding and to secure the bonding strength. The influence of friction stir welding from the upper side and the lower side of the flange portion can be shifted in the radial direction of the pipe.
The structure of the fitting portion and the fitting hole portion having a stepped fitting surface has a large diameter fitting portion or a large diameter fitting hole portion on the upper side and a small diameter fitting portion or a small diameter fitting hole portion on the lower side. By doing so, the second aluminum member can directly support the axial load acting on the first aluminum member with the stepped fitting surface, and the influence of the axial load on the friction stir joint can be reduced. Can do.

  In the present invention, a joining plane that is flush with the plane of the plate-like second aluminum member is formed on the flange portion of the pipe-like first aluminum member. The joining plane can be previously machined. A plane for supporting the end of the coil spring can be secured by the plane of the joining portion.

  When joining by friction stir welding, a recess remains in the toe of the joint after the friction stir tool is pulled out. In this invention, when joining a 1st aluminum member and a 2nd aluminum member by friction stir welding, the extra space which makes it possible to insert / extract a tool to a 2nd aluminum member can be provided. This extra space can be cut or cut when the main process is completed.

  According to the shaft spring seat for a shaft box support device and the manufacturing method thereof according to the present invention, in the case of a small number of production, it is not necessary to newly manufacture a mold used for forging, and a flexible response to a shape change can be taken. Can do.

  With reference to the drawings, a preferred embodiment of a shaft spring seat for a shaft box support device (hereinafter simply referred to as a shaft spring seat) according to the present invention will be described. FIG. 1 is a perspective view showing an overall view of an embodiment of a shaft spring seat made of an aluminum alloy according to the present invention. The shaft spring seat is a component that constitutes each shaft box support device that guides and supports a coil spring that elastically supports the carriage frame, which is disposed before and after the shaft box body, and includes a first aluminum member 1 and a second aluminum member 2. And assembled. One first aluminum member 1 to be joined is a member having a pipe shape, and the other member is a plate-like second aluminum member 2. The 1st aluminum member 1 and the 2nd aluminum member 2 are between the fitting part 7 formed in the 1st aluminum member 1, and the fitting hole part 9 of the 2nd aluminum member into which this fitting part 7 enters. Joined by applied friction stir welding. The joined portion is shown as a flat joint 3 that is flush. On the outer peripheral surface of the first aluminum member 1, a coil spring that elastically supports the carriage frame is fitted and the lower end of the coil spring is supported on the joint 3. Although not shown, the coil spring is disposed between the upper shaft spring seat and the lower shaft spring seat, and the outer surface of the rod-like portion hanging from the upper shaft spring seat and the lower shaft spring seat (first aluminum member). A support rubber such as a laminated rubber obtained by laminating a metal plate and an elastic rubber is provided between the inner surface and a part of the load is supported between the support rubber and the carriage frame.

  FIG. 2 is a partially enlarged perspective view showing the movement of the tool when the first aluminum member 1 and the second aluminum member 2 are joined by friction stir welding. As shown in FIGS. 1 and 2, when the first aluminum member 1 and the second aluminum member 2 are joined by friction stir welding, the friction stir welding tool moves in the movement direction indicated by the arrow 61. At this time, the second aluminum member 2 has a tool insertion / removal portion 62 as a joining stop portion, and a recess is formed in this portion. In order to cope with this, the second aluminum member 2 is provided with a surplus space 21 that allows the friction stir welding tool to be inserted and removed. The surplus space 21 can be cut off or cut by the cutting line 22 when the main machining is completed and the shaft spring seat is finished.

  FIG. 4 is a perspective view showing a state in which the first aluminum member 1 and the second aluminum member 2 are separated before obtaining the aluminum axle box support device shown in FIG. 1. The first aluminum member 1 is formed with a flange-like fitting portion 7 for fitting to the second aluminum member 2. The fitting portion 7 is formed in the pipe-shaped first aluminum member 1 by machining, for example, cutting. The second aluminum member 2 is formed with fitting holes 9 having the same dimensions corresponding to the fitting parts 7 of the first aluminum member 1.

  FIG. 5 is a partial schematic cross-sectional view showing a state before the first aluminum member and the second aluminum member are fitted together. 6 is a partial schematic cross-sectional view showing a state after fitting both aluminum members from FIG. As shown in FIGS. 5 and 6, the flange-like fitting portion 7 of the first aluminum member 1 is formed in a step shape in the vertical direction. In other words, the fitting portion 7 is composed of fitting portions that are divided in a step-like manner by an upper large-diameter fitting portion 7a and a lower small-diameter fitting portion 7b. The large-diameter outer peripheral surface 8a of the large-diameter fitting portion 7a, the small-diameter outer peripheral surface 8b of the small-diameter fitting portion 7b, and the annular lower surface 8c that connects the large-diameter outer peripheral surface 8a and the small-diameter outer peripheral surface 8b A step-like fitting surface 8 is formed.

  Corresponding to the fitting surface 8 of the fitting part 7, also in the 2nd aluminum member 2, the fitting hole part 9 is formed in the step shape in the up-down direction. That is, the fitting hole portion 9 is divided into a stepped shape of an upper large-diameter fitting hole portion 9a and a lower small-diameter fitting hole portion 9b. The upper large-diameter inner peripheral surface 10a corresponding to the large-diameter fitting hole portion 9a, the lower small-diameter inner peripheral surface 10b corresponding to the small-diameter fitting hole portion 9b, and the large-diameter inner peripheral surface 10a and the small-diameter inner peripheral surface 10b. The annular upper surface 10c that connects the two forms a stepped fitting surface 10 in which the fitting holes 9 are continuous.

  The fitting portion 7 of the first aluminum member 1 and the fitting hole portion 9 of the second aluminum member 2 have a large-diameter fitting portion 7a and a small-diameter fitting portion 7b, respectively, and a large-diameter fitting hole portion 9a and a small-diameter fitting. In the fitted state, the annular lower surface 8c of the fitting portion 7 is fitted in a state of contacting the annular upper surface 10c of the fitting hole portion 9b. A gap is not substantially formed between the fitting surface 8 and the fitting surface 10. When the load on the carriage frame is supported as the axle box support device, the load is supported via a coil spring and a contact structure between the annular lower surface 8c and the annular upper surface 10c. At this time, the transmission and support of the load via the contact structure is performed on the safe side from the annular lower surface 8c to the annular upper surface 10c. That is, the load between the annular lower surface 8c and the annular upper surface 10c is not a tensile load in a direction separating from each other, but is transmitted in a state where they are pressed against each other.

  A joining plane 12 is formed on the upper surface of the flange-shaped fitting portion 7 of the first aluminum member 1. The joining plane 12 is formed so as to be flush with the upper plane 13 of the flat plate-like second aluminum member 2. The joining plane 12 and the upper plane 13 are in contact with the lower end of the coil spring of each axle box support device, and can support the load of the axle spring. The joining plane 12 can be previously machined. By flattening the upper surface of the joint portion between the first aluminum member 1 and the second aluminum member 2, a flat surface for supporting the end of the coil spring can be secured.

  As shown in FIG. 6, after fitting the first aluminum member 1 and the second aluminum member 2, the fitting portion 7 and the fitting hole portion 9 are formed by the friction stir tools 6 and 6 from both the upper and lower sides. A shaft spring seat is configured by performing friction stir welding on the joint portion 3. FIG. 3 is a partial cross-sectional view showing a state where the friction stir welding between the fitted first aluminum member and the second aluminum member is performed. As shown in FIG. 3, by making the joining surface 3 stepped, the position of the agitating portion 5 is shifted inward and outward in the radial direction, so the influence of friction stir welding from the upper side and the lower side of the flange portion is affected. It can be shifted in the radial direction, and the bonding strength can be improved. In addition, it is possible to improve the manufacturability when the first aluminum member 1 and the second aluminum member 2 are fitted to each other with a dimensional shift and joining.

  Friction stir welding has higher joint strength than normal welding. Further, it is possible to flexibly cope with a shape change. Furthermore, since no mold is required, it is not necessary to manufacture a mold.

It is a whole perspective view concerning one example of a shaft spring seat for a shaft box support device by the present invention. It is a partially expanded perspective view which shows the mode of the movement of a tool at the time of joining the 1st aluminum member and 2nd aluminum member which concern on the axial spring seat for axle box support apparatuses shown in FIG. It is a fragmentary sectional view which shows the state which performed the friction stir welding of the 1st aluminum member and the 2nd aluminum member in the shaft spring seat for shaft box support apparatuses shown in FIG. It is a perspective view which shows the state by which the 1st aluminum member 1 and the 2nd aluminum member 2 were isolate | separated before obtaining the axial spring seat for axle box support apparatuses shown in FIG. It is a partial schematic sectional drawing which shows the state before the fitting of the 1st aluminum member and 2nd aluminum member of the axial spring seat for axle box support apparatuses shown in FIG. It is a partial schematic sectional drawing which shows the state after the fitting of both the aluminum members shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st aluminum member 2 2nd aluminum member 3 Joining part 5 Stirring part 6 Tool 7 Fitting part 7a Large diameter fitting part 7b Small diameter fitting part 8 Fitting surface 8a Large diameter outer peripheral surface 8b Small diameter outer peripheral surface 8c Annular lower surface 9 Fitting hole portion 9a Large-diameter fitting hole portion 9b Small-diameter fitting hole portion 10 Fitting surface 10a Large-diameter inner circumferential surface 10b Small-diameter inner circumferential surface 10c Annular upper surface 12 Joining plane 13 Upper plane 21 Cutting section 22 Cutting line 61 Tool movement Direction 62 Tool insertion / removal part

Claims (8)

  A pipe-shaped first aluminum member and a plate-shaped second aluminum member are provided, a flange-like fitting portion is formed on the outer periphery of the first aluminum member, and the first aluminum member has the first aluminum member. Formed when a fitting hole portion into which the fitting portion of the aluminum member is fitted is formed and the fitting portion of the first aluminum member is fitted into the fitting hole portion of the second aluminum member. A shaft spring seat for a shaft box support device, wherein the joint portion is joined by friction stir welding. In the axial spring seat for the axle box support device according to claim 1,
The joint portion between the first aluminum member and the second aluminum member is stepped,
Performing the friction stir welding from the upper surface and the friction stir welding from the lower surface in a radial direction,
A shaft spring seat for a shaft box support device. In the axial spring seat for the axle box support device according to claim 2,
The fitting portion of the first aluminum member is an upper large-diameter fitting portion and a lower small-diameter fitting portion,
Corresponding to the large diameter fitting portion and the small diameter fitting portion of the first aluminum member, the fitting hole portion of the second aluminum member is fitted to the upper large diameter fitting hole portion and the lower small diameter fitting portion. Formed in the hole part,
A shaft spring seat for a shaft box support device. In the axle spring seat for axle box support devices according to any one of claims 1 to 3,
An extra space is provided for inserting and removing the friction stir welding tool in the second aluminum member;
A shaft spring seat for a shaft box support device.   A flange-like fitting portion is processed in the pipe-like first aluminum member, a fitting hole portion into which the fitting portion of the first aluminum member can be fitted is formed in the plate-like second aluminum member, and the first A shaft spring seat for a shaft box support device, wherein a joint portion formed by fitting the fitting portion of one aluminum member into the fitting hole portion of the second aluminum member is joined by friction stir welding. Production method. In the manufacturing method of the axial-spring seat for axial-box support apparatuses of Claim 5,
The joint portion between the first aluminum member and the second aluminum member is stepped,
Performing the friction stir welding from the upper surface and the friction stir welding from the lower surface in a radial direction,
A method of manufacturing a shaft spring seat for a shaft box support device. In the axial spring seat for the axle box support device according to claim 6,
The fitting portion of the first aluminum member is an upper large-diameter fitting portion and a lower small-diameter fitting portion,
Corresponding to the large diameter fitting portion and the small diameter fitting portion of the first aluminum member, the fitting hole portion of the second aluminum member is fitted to the upper large diameter fitting hole portion and the lower small diameter fitting portion. Formed in the hole part,
A method of manufacturing a shaft spring seat for a shaft box support device. In the manufacturing method of the axial spring seat of Claim 5 or 6,
Performing insertion and removal of the friction stir welding tool in an extra space provided in the second aluminum member,
A method of manufacturing a shaft spring seat for a shaft box support device.

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