JP6748017B2 - Axle manufacturing method - Google Patents

Description

The present invention relates to a method of manufacturing an axle.

Generally, an axle is manufactured by shrink-fitting the axle end to the end of the axle housing connected to the differential and then welding, and shrink-welding the brake flange to the end of the axle housing. (For example, see Patent Document 1).

Japanese Patent Laid-Open No. 05-330355

By the way, the attachment portion of the axle housing to which the brake flange is attached has a small diameter, and some axles have an R-shaped step formed at the base of the attachment portion. In such an axle, the axle end is attached at a position separated from the step so that the brake flange does not ride on the step. The distance from the step to the brake flange varies depending on the type of axle, the type of vehicle in which the axle is installed, etc., but if the distance from the step to the brake flange is long, when welding the axle housing and the brake flange, , The step may not be covered with weld metal. If the step portion is not covered with the weld metal, stress concentration may occur on the step portion, leading to a reduction in the life of the axle.

For such a problem, it is conceivable to widen the width of the weld metal in the axial direction of the axle housing by slowing (lowering) the relative moving speed of the arc welding torch with respect to the axle housing and the brake flange.

However, when the relative moving speed of the arc welding torch relative to the axle housing and the brake flange is slowed, the heat input to the axle housing and the brake flange becomes excessive, which causes a problem that the distortion of the axle housing increases.

Therefore, an object of the present invention is to provide a method for manufacturing an axle that can suppress the occurrence of stress concentration while suppressing an increase in the amount of heat input to the axle housing and the brake flange.

The manufacturing method of an axle according to the present invention comprises a brake flange welding step of arc welding the axle housing and a brake flange attached to the outer peripheral surface of the axle housing, and in the brake flange welding step, an axle housing and an arc welding torch are used. Is relatively moved in the axial direction of the axle housing, and the axle housing and the arc welding torch are relatively reciprocated in the axial direction of the axle housing to arc-weld the axle housing and the brake flange.

In this axle manufacturing method, the axle housing and the arc flange can be relatively moved in the axial direction of the axle housing to weld the axle housing and the brake flange all around. By relatively reciprocating the axle housing and the arc welding torch in the axial direction of the axle housing, the weld metal for arc welding can be spread in the axial direction of the axle housing. As a result, the weld metal can be spread to the position where the stress concentration occurs and the step portion can be covered with the weld metal, so that it is possible to manufacture an axle in which the stress concentration is suppressed. Moreover, the weld metal can be formed in a wide range without slowing the relative movement speed of the arc welding torch with respect to the axle housing and the brake flange. As a result, an increase in the amount of heat input to the axle housing and the brake flange can be suppressed, so an increase in distortion of the axle housing and the brake flange can be suppressed.

In the brake flange welding process, the axle housing may be rotated around the axis and the arc welding torch may be reciprocated in the axial direction of the axle housing. In this axle manufacturing method, the axle housing is rotated around the axis and the arc welding torch is reciprocally moved in the axial direction of the axle housing, so that the axle housing and the brake flange can be easily arc-welded.

The attachment part of the axle housing where the brake flange is attached is located on the tip side of the axle housing with respect to the step portion and the step portion where the outer diameter becomes smaller toward the tip side of the axle housing, and along the axial direction of the axle housing. The outer circumference has the same diameter portion, and the brake flange is attached at a position separated from the step portion of the same diameter portion.In the brake flange welding process, the arc from the brake flange to the step portion is arced. The welding torch may be reciprocated in the axial direction of the axle housing to arc weld the axle housing and the brake flange. In this axle manufacturing method, the arc welding torch is mounted at a position separated from the step of the same diameter part, but since the arc welding torch is reciprocally moved in the axial direction of the axle housing from the brake flange to the step, Can be covered with weld metal. As a result, it is possible to suppress stress concentration on the stepped portion.

By the way, in the conventional method of manufacturing an axle, the shrink fitting is performed in which the end portion of the axle housing is heated and expanded to fit the axle end in the axle housing. Then, when the end portion of the axle housing cools and solidifies, the axle end hangs down by its own weight, so that the axle housing is distorted, and the axle end is inclined with respect to the axis line of the axle housing. Inclination of the axle end with respect to the axis of the axle housing is also called swing of the axle end. After that, the brake flange is shrink-fitted to the axle housing, but because the axle end is tilted with respect to the axle housing due to the distortion of the axle housing, the axle line of the axle housing, the axis line of the brake flange, and the axle line of the axle end. , Are out of alignment. Further, due to distortion of the brake flange, the squareness of the brake flange with respect to the axle end is reduced. For this reason, it is necessary to perform a large-scale machining to remove the distortion of the axle housing and the brake flange in the post process.

Therefore, in view of such a problem, the present invention further includes, before the brake flange welding step, a brake flange press-fitting step of press-fitting the brake flange to the outer peripheral surface of the end portion of the axle housing at room temperature, and an end portion of the axle housing. It is preferable to include an axle end press-fitting step of press-fitting the axle end on the inner peripheral surface at room temperature, and an axle end welding step of arc welding the axle housing and the axle end after the axle end press-fitting step.

In this axle manufacturing method, the brake flange is cold pressed into the outer peripheral surface of the end of the axle housing, and the axle end is cold pressed into the inner peripheral surface of the end of the axle housing. Compared with the above, it is possible to suppress the distortion occurring in the axle housing and the brake flange, and to significantly suppress the swing of the axle end and the decrease in the squareness of the brake flange. As a result, it is possible to reduce the number of machining processes for removing the strain generated in the axle housing, so that the number of axle manufacturing steps can be reduced.

In the brake flange welding process and the axle end welding process, the arc is generated by energizing the electrode to form the melted part, and the trailing wire is supplied to the melted part without being energized before the melted part is hardened. Good. Since the non-energized trailing wire is not heated, by supplying the non-energized trailing wire to the melted portion before hardening, the melted portion can be cooled by the cold trailing wire. As a result, the heat shrinkage range of the melted portion is narrowed, and the heat input to the axle housing and the brake flange can be suppressed to a small amount, so that the heat shrinkage when the melted portion is cooled and hardened can be significantly suppressed. As a result, the strain generated in the axle housing and the brake flange can be significantly suppressed, so that the runout of the axle end and the decrease in the squareness of the brake flange can be significantly suppressed. As a result, it is possible to reduce the number of machining processes for removing the strain generated in the axle housing and the brake flange, so that the number of axle manufacturing steps can be reduced.

According to the present invention, it is possible to provide an axle manufacturing method capable of suppressing the occurrence of stress concentration while suppressing an increase in the amount of heat input to the axle housing and the brake flange.

It is a front view which shows an axle. It is the figure which expanded the area|region A of FIG. It is an expansion exploded view of an axle. It is a figure for demonstrating a brake flange welding process. It is a figure which shows the relative movement locus of the welding torch with respect to the axle housing in FIG. It is a figure for demonstrating the welding method in a brake flange welding process and an axle end welding process. 5 is a diagram for explaining a brake flange welding process of Comparative Example 1. FIG. It is a figure which shows the relative movement locus|trajectory of the welding torch with respect to the axle housing in FIG. FIG. 8 is a diagram for explaining an axle end shrink fitting process of Comparative Example 2. FIG. 7 is a diagram for explaining an axle end shrink fitting process and a brake flange shrink fitting process of Comparative Example 2;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding elements will be denoted by the same reference symbols, without redundant description.

As shown in FIGS. 1 to 3, the axle manufacturing method according to the present embodiment is a method for manufacturing a rear axle. In the axle 1 manufactured by the method for manufacturing an axle according to the present embodiment, the brake flange 3 is press-fitted on the outer peripheral surface of the end portion of the axle housing 2, and the axle housing 2 and the brake flange 3 are completely welded by arc welding. It is welded around. The brake flange 3 is a ring-shaped member for mounting a drum brake (not shown), and has a hole (not shown) for mounting the drum brake formed along the circumferential direction. Further, the axle end 4 is press-fitted into the inner peripheral surface of the end portion of the axle housing 2, and the axle housing 2 and the axle end 4 are welded all around by arc welding.

At the end of the axle housing 2, a mounting portion 5 having a reduced outer diameter is formed. The attachment portion 5 is a portion to which the brake flange 3 is attached (press-fitted). The mounting portion 5 is composed of a step portion 6 and a same diameter portion 7. The step portion 6 is a portion located on the base end side of the mounting portion 5 and the outer diameter of which becomes smaller toward the tip end side of the axle housing 2. The step portion 6 is formed, for example, in a concave curved surface shape (R shape) having a predetermined radius of curvature. The same-diameter portion 7 is a portion to which the brake flange 3 is attached (press-fitted), is located on the tip end side of the axle housing 2 with respect to the step portion 6, and has an outer periphery over the entire axial direction of the axle housing 2. It is a part having the same diameter.

The brake flange 3 is attached at a position separated from the step portion 6 of the same diameter portion 7, and the weld metal 8 that welds the axle housing 2 and the brake flange 3 covers the step portion 6. ..

As shown in FIG. 3, in the axle manufacturing method according to the present embodiment, first, a mounting portion forming step is performed. In the mounting portion forming step, the mounting portion 5 having a reduced outer circumference is formed at the end portion of the axle housing 2. That is, the end portion of the axle housing 2 is formed into a cylindrical shape, and the step portion 6 and the same diameter portion 7 of the mounting portion 5 are cut by cutting the outer peripheral surface of the end portion of this cylindrically formed axle housing. To form. At this time, the outer diameter of the same diameter portion 7 is made slightly larger than the inner diameter of the brake flange 3. The cutting of the end portion of the axle housing 2 can be performed, for example, by a general cutting machine.

When the mounting portion forming process is completed, a brake flange press-fitting process is performed next. In the brake flange press-fitting process, the brake flange 3 is press-fitted to the outer peripheral surface of the mounting portion 5 at room temperature. Pressing at room temperature means pressing at room temperature without heating like shrink fitting. Here, when the brake flange 3 is press-fitted to the step portion 6, the brake flange 3 rides on the step portion 6, stress concentration occurs on the brake flange 3 and the step portion 6, and the durability thereof decreases. Therefore, in the brake flange press-fitting process, the brake flange 3 is press-fitted to a position separated from the step 6 of the same diameter portion 7. That is, the brake flange 3 is not pressed into the step portion 6. The distance from the step 6 to the brake flange 3 varies depending on the type of the axle 1, the type of vehicle on which the axle 1 is mounted, and the like. The brake flange 3 can be press-fitted into the mounting portion 5 by, for example, a general press machine.

When the brake flange press-fitting process is completed, a brake flange welding process is performed next. In the brake flange welding process, the axle housing 2 and the brake flange 3 press-fitted (attached) to the attachment portion 5 of the axle housing 2 are arc-welded. The brake flange 3 is welded to the axle housing 2 both inside and outside the brake flange 3.

As shown in FIGS. 4 and 5, in the brake flange welding step, the axle housing 2 and the arc welding torch 12 of the welding device 11 are relatively moved in the axial direction (circumferential direction) of the axle housing 2, and The axle housing 2 and the arc welding torch 12 are relatively reciprocated in the axial direction of the axle housing 2 to arc-weld the axle housing 2 and the brake flange 3. In the present embodiment, the axle housing 2 is rotated around the axis, and the arc welding torch 12 of the welding device 11 is reciprocated in the axial direction of the axle housing 2 to arc weld the axle housing 2 and the brake flange 3. ..

That is, when the axle housing 2 is rotated around the axis, the welding position for arc welding moves in the direction around the axis of the axle housing 2, so that the weld metal 8 for arc welding extends in the direction around the axis of the axle housing 2. As a result, the axle housing 2 and the brake flange 3 are welded all around.

Further, when the arc welding torch 12 is reciprocally moved in the axial direction of the axle housing 2, the welding position for arc welding moves in the axial direction of the axle housing 2, so that the weld metal 8 for arc welding moves in the axial direction of the axle housing 2. Spread to. Then, in the present embodiment, the arc welding torch 12 is reciprocated in the axial direction of the axle housing 2 from the brake flange 3 to the step portion 6, whereby the weld metal 8 for arc welding is moved in the axial direction of the axle housing 2. The area between the brake flange 3 and the step 6 and the step 6 are unfolded and covered with the weld metal 8 for arc welding.

Note that the arc welding torch 12 is reciprocally moved in the axial direction of the axle housing 2 to arc-weld the axle housing 2 and the brake flange 3 only on the inside of the vehicle side of the brake flange 3.

Here, a specific welding method in the brake flange welding step will be described in detail with reference to FIG. 6 as well.

In the brake flange welding process, cold tandem welding is performed as an arc welding method. Cold tandem welding is a welding method using two wires, a leading welding wire and a trailing filler wire, in which a molten portion is formed at the groove by an arc generated by energizing the leading welding wire, and this melting This is a welding method in which the trailing filler wire is supplied to the fusion zone without being energized before the zone is cured.

As shown in FIG. 6, a welding device 11 that performs cold tandem welding includes an arc welding torch 12, a filler wire supply device 13, and a connecting member 14.

The arc welding torch 12 performs arc welding. The arc welding torch 12 sends out the welding wire 16 as a consumable electrode sent from the first wire sending device 15 toward the welding position of the base material. Further, the arc welding torch 12 supplies the welding current supplied from the power supply device 17 to the welding wire 16 to generate an arc between the welding wire 16 and the base material. As the welding wire 16, for example, a solid wire conforming to JIS Z3312 YGW12 can be used.

The filler wire supply device 13 supplies the filler wire 19 delivered from the second wire delivery device 18 to a position close to the welding position of the base material without energization. As the filler wire 19, for example, a solid wire conforming to JIS Z3312 YGW12 can be used.

The connecting member 14 is for arc welding while maintaining the interval between the arc welding torch 12 and the filler wire supply device 13 so that the welding position by the welding wire 16 and the position at which the filler wire 19 is delivered are a predetermined distance. It is a device that connects the torch 12 and the filler wire supply device 13. The connecting member 14 may detachably connect the arc welding torch 12 and the filler wire supply device 13, or may fixedly connect the arc welding torch 12 and the filler wire supply device 13. Further, the connecting member 14 may have a fixed interval between the arc welding torch 12 and the filler wire supply device 13, or may have a variable interval between the arc welding torch 12 and the filler wire supply device 13.

The welding device 11 configured as described above is configured so that when the arc welding torch 12 and the filler wire supply device 13 connected to the connecting member 14 move relative to the base metal, the filler wire moves in the moving direction. The supply device 13 is arranged behind the torch 12 for arc welding. Therefore, the position where the filler wire 19 is sent out is behind the welding position of the welding wire 16 in the moving direction. In the present embodiment, the direction in which the arc welding torch 12 and the filler wire supply device 13 move relative to the base metal is referred to as the “traveling direction”.

In cold tandem welding, the axle housing 2 is rotated around the axis, and the arc welding torch 12 and the filler wire supply device 13 of the welding device 11 are reciprocally moved in the axial direction of the axle housing 2. Then, the arc welding torch 12 is moved prior to the filler wire supply device 13, and the filler wire supply device 13 is moved behind the arc welding torch. Therefore, the welding wire 16 sent out from the arc welding torch 12 becomes a leading wire, and the filler wire 19 sent out from the filler wire supply device 13 becomes a trailing wire.

At this time, in the arc welding torch 12 preceding the filler wire supply device 13, a welding current is passed through the welding wire 16 to form an arc 21 between the welding wire 16 and the axle housing 2 and the brake flange 3 as the base material. generate. Then, in the axle housing 2 and the brake flange 3 which are the base materials, the fusion portion 22 in which the welding wire 16 is fused is formed.

The melting part 22 is composed of a molten pool. The melting portion 22 is dug below the arc 21 by receiving the pressure (arc force) from the arc 21, and the portion most dug by the arc force is the bottom 22a of the melting portion 22. Further, in the melting portion 22, the influence of the arc force is weakened as the distance from the bottom portion 22a increases, and the melting portion 22 gradually rises and rises. Therefore, a raised portion 22b, in which the melted portion 22 is raised, is formed behind the bottom portion 22a in the traveling direction. The raised portion 22b is a portion made of molten metal before being hardened (solidified). Then, the rising portion 22b is cooled and hardened (solidified), so that an extra portion of the weld metal 8 is formed at the joint between the axle housing 2 and the brake flange 3. This extra size is also called a bead.

On the other hand, the filler wire supply device 13 following the arc welding torch 12 supplies the filler wire 19 to the rising portion 22b of the melting portion 22 without energizing. The supply position of the filler wire 19 can be adjusted, for example, by adjusting the distance between the arc welding torch 12 and the filler wire supplying device 13 by the connecting member 14, or adjusting the orientation of the filler wire supplying device 13.

When the filler wire 19 is supplied to the rising portion 22b of the melting portion 22, the filler wire 19 is melted by the heat of the melting portion 22, and the molten metal is replenished in the melting portion 22. As a result, a good excess of molten metal is formed.

Further, since the filler wire 19 which is not energized is not heated, when the filler wire 19 is supplied to the rising portion 22b of the melting portion 22, the heat of the melting portion 22 is taken by the filler wire 19 and the melting portion 22 is cooled. It

When the brake flange welding process is completed, next, an axle end press-fitting process is performed. As shown in FIGS. 1 to 3, in the axle end press-fitting step, the axle end 4 is press-fitted into the inner peripheral surface of the end portion of the axle housing 2. The axle end 4 is formed in a cylindrical shape, and its outer diameter is made slightly larger than the inner diameter of the end portion of the axle housing 2. The axle end 4 can be press-fitted into the end portion of the axle housing 2 by, for example, a general press machine.

When the axle end press-fitting process is completed, next, an axle end welding process is performed. In the axle end welding process, the axle housing 2 and the axle end 4 press-fitted (attached) to the axle housing 2 are arc-welded. In the axle end welding step, the axle housing 2 and the arc welding torch 12 of the welding device 11 are relatively moved in the axial direction (circumferential direction) of the axle housing 2 to arc the axle housing 2 and the axle end 4. Weld. In this embodiment, the axle housing 2 is rotated about an axis, and the axle housing 2 and the axle end 4 are arc-welded by cold tandem welding. Cold tandem welding in the axle end welding process is similar to cold tandem welding in the brake flange welding process. In the axle end welding process, the axle housing 2 and the arc welding torch 12 do not have to be relatively reciprocated in the axial direction of the axle housing 2, unlike the brake flange welding process.

Here, a method of manufacturing the axle of Comparative Example 1 will be described with reference to FIGS. 7 and 8.

As shown in FIGS. 7 and 8, in the axle manufacturing method of Comparative Example 1, in the brake flange welding process, the axle housing 2 and the arc welding torch 12 are relatively reciprocated in the axial direction of the axle housing 2. Only by this, the axle housing 2 and the arc welding torch 12 of the welding device 11 are not relatively moved in the axial direction (circumferential direction) of the axle housing 2, and the axle housing 2 and the brake flange 3 are arc-welded. ..

Therefore, in the axle manufacturing method of Comparative Example 1, when the distance from the step 6 to the brake flange 3 is long, the step 6 is covered with the weld metal 8 when the axle housing 2 and the brake flange 3 are welded. There is a possibility not to be missed. If the step portion 6 is not covered with the weld metal, stress concentration may occur on the step portion 6 and the life of the axle 1 may be shortened.

On the other hand, in the axle manufacturing method of the present embodiment, the arc welding torch 12 is reciprocated in the axial direction of the axle housing 2 so that the axle housing 2 and the arc welding torch 12 are moved in the axial direction of the axle housing 2. By relatively reciprocating the welding metal 8 for arc welding, the welding metal 8 can be spread in the axial direction of the axle housing 2 to cover the step 6 with the welding metal 8. Specifically, since the arc welding torch 12 is reciprocated in the axial direction of the axle housing 2 from the brake flange 3 to the step portion 6, the step portion 6 can be covered with the weld metal 8. As a result, it is possible to prevent stress concentration from occurring in the step portion 6, so that it is possible to manufacture the axle 1 in which the stress concentration is suppressed.

Moreover, the weld metal 8 can be formed in a wide range without slowing the relative movement speed of the arc welding torch 12 with respect to the axle housing 2 and the brake flange 3. As a result, an increase in the amount of heat input to the axle housing 2 and the brake flange 3 can be suppressed, so that an increase in distortion of the axle housing 2 and the brake flange 3 can be suppressed.

Here, a method of manufacturing the axle of Comparative Example 2 will be described with reference to FIGS. 9 and 10.

As shown in FIGS. 9 and 10, the method of manufacturing the axle of Comparative Example 2 is a method of manufacturing the axle 101. In the axle manufacturing method of Comparative Example 2, the axle end shrink fitting process, the axle end welding process, the brake flange shrink fitting process, and the brake flange welding process are performed in this order.

In the axle end shrink fitting step, as shown in FIG. 9, the axle end 104 is shrink fit on the end portion of the axle housing 102. That is, the end portion of the axle housing 102 is heated and expanded to fit the axle end 104 on the inner peripheral surface of the axle housing 102. Then, as shown in FIG. 10, when the end portion of the axle housing 102 is cooled and solidified, the axle end 104 hangs down by its own weight, so that the axle housing 102 is distorted, and the axle end 104 with respect to the axis line of the axle housing 102. It will be tilted. The tilting of the axle end 104 with respect to the axis of the axle housing 102 is also referred to as swing of the axle end 104.

In the axle end welding process, the axle housing 102 and the axle end 104 are welded by normal arc welding. At this time, since the axle housing 102 and the axle end 104 are heated by arc welding, the amount of strain increases.

In the brake flange shrink fitting process, as shown in FIG. 10, the brake flange 103 is shrink fitted to the axle end 104. That is, the brake flange 103 is heated and expanded to fit the brake flange 103 on the outer peripheral surface of the axle end 104. Then, when the brake flange 103 cools and hardens, the brake flange 103 is distorted, and the squareness of the brake flange 103 with respect to the axle end 104 decreases.

In the brake flange welding process, the axle end 104 and the brake flange 103 are welded by normal arc welding. At this time, since the axle end 104 and the brake flange 103 are heated by arc welding, the amount of strain increases.

As described above, in the axle manufacturing method of Comparative Example 2, since the axle end 104 is inclined with respect to the axle housing 102 due to the strain of the axle housing 102 and the axle end 104, the axis line of the axle housing 102 and the brake flange The axis of 103 and the axis of the axle end 104 are displaced. Further, due to the distortion of the brake flange 103 and the axle end 104, the squareness of the brake flange 103 with respect to the axle end 104 is reduced. Therefore, it is necessary to perform large-scale machining for removing the distortion of the axle housing 102, the brake flange 103, and the axle end 104 in the post process.

On the other hand, in the axle manufacturing method of the present embodiment, the brake flange 3 is press-fitted to the outer peripheral surface of the end portion of the axle housing 2 at room temperature, and the axle end 4 is press-fitted to the inner peripheral surface of the end portion of the axle housing 2 at room temperature. Therefore, as compared with Comparative Example 2 in which these are shrink-fitted, distortion occurring in the axle housing 2 and the brake flange 3 is suppressed, and the deflection of the axle end 4 and the decrease in the squareness of the brake flange 3 are significantly suppressed. You can As a result, it is possible to reduce the machining process for removing the strain generated in the axle housing 2 and the brake flange 3, so that the number of manufacturing steps of the axle 1 can be reduced.

Further, by performing the brake flange welding process and the axle end welding process by cold tandem welding, the molten portion 22 can be cooled by the cold filler wire 19. As a result, the heat shrinkage range of the fusion zone 22 is narrowed, and the heat input to the axle housing 2, the brake flange 3 and the axle end 4 can be suppressed to a small amount, so that the heat shrinkage when the fusion zone 22 is cooled and hardened. It can be suppressed significantly. As a result, the strain generated in the axle housing 2, the brake flange 3, and the axle end 4 can be significantly suppressed, so that the runout of the axle end 4 and the decrease in the squareness of the brake flange 3 can be significantly suppressed. .. As a result, it is possible to reduce the machining process for removing the strain generated in the axle housing 2, the brake flange 3, and the axle end 4, so that the number of manufacturing steps of the axle 1 can be reduced.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

For example, in the brake flange welding process, the axle housing and the arc welding torch are relatively moved in the axial direction of the axle housing, and the axle housing and the arc welding torch are relatively reciprocated in the axial direction of the axle housing. Any member may be moved as long as it can be moved.

Further, in the brake flange welding process and the axle end welding process, arc welding other than cold tandem welding may be performed.

Further, the order of each step can be appropriately changed. For example, the brake flange press-fitting process, the axle end press-fitting process, the brake flange welding process, and the axle end welding process may be performed in this order.

1... Axle, 2... Axle housing, 3... Brake flange, 4... Axle end, 5... Mounting part, 6... Step part, 7... Same diameter part, 8... Weld metal, 11... Welding device, 12... Arc welding Torch, 13... Filler wire supply device, 14... Connection member, 15... First wire delivery device, 16... Welding wire, 17... Power supply device, 18... Second wire delivery device, 19... Filler wire (subsequent wire) , 21... Arc, 22... Melting part, 22a... Bottom part, 22b... Raised part, 101... Axle, 102... Axle housing, 103... Brake flange, 104... Axle end.

Claims (5)

Provided with a brake flange welding step of arc welding the axle housing and the brake flange attached to the outer peripheral surface of the axle housing,
In the brake flange welding step, the axle housing and the arc welding torch are moved relatively in the axial direction of the axle housing, and the axle housing and the arc welding torch are moved in the axial direction of the axle housing. Reciprocating relatively, arc welding the axle housing and the brake flange,
Axle manufacturing method. In the brake flange welding step, while rotating the axle housing about an axis, the arc welding torch is reciprocated in the axial direction of the axle housing.
The method for manufacturing the axle according to claim 1. The attachment portion of the axle housing to which the brake flange is attached is located at a step portion whose outer circumference decreases in diameter toward the tip end side of the axle housing, and the tip end side of the axle housing with respect to the step portion. And an outer diameter having the same outer diameter along the axial direction of,
The brake flange is attached to a position separated from the step portion of the same diameter portion,
In the brake flange welding step, an arc welding torch is reciprocally moved in the axial direction of the axle housing from the brake flange to the step portion, and arc welding is performed between the axle housing and the brake flange.
A method for manufacturing the axle according to claim 1 or 2. Prior to the brake flange welding step, a brake flange press-fitting step in which a brake flange is press-fitted to the outer peripheral surface of the end portion of the axle housing at room temperature,
An axle end press-fitting step in which the axle end is press-fitted at room temperature onto the inner peripheral surface of the end portion of the axle housing,
After the axle end press-fitting step, an axle end welding step of arc welding the axle housing and the axle end is provided.
The method for manufacturing the axle according to claim 1. In the brake flange welding step and the axle end welding step, a molten portion is formed by an arc generated by energizing the electrode, and before the molten portion is hardened, the trailing wire is not energized to the molten portion. Supply,
The method for manufacturing the axle according to claim 4.

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