JP2022178147A - Friction joining device and friction joining method - Google Patents

Abstract

To provide a technique that can reduce mechanical loads in friction joining and stabilize a joining quality.SOLUTION: A friction joining device is configured to make a first work-piece and a second work-piece which rotate in mutually opposite directions abut on each other in a rotating axis direction, soften a sliding part between the first work-piece and the second work-piece with friction heat, and then stop rotations of the first work-piece and the second work-piece so as to join the first work-piece to the second work-piece through the sliding part. Capabilities of stopping rotations of respective main spindles of a first main spindle mechanism rotatably comprising a first main spindle for griping the first work-piece and of a second main spindle mechanism rotatably comprising a second main spindle for griping the second work-piece are different from each other. A control part controls the first main spindle mechanism and the second main spindle mechanism on the basis of the respective capabilities of stopping rotation so that the rotation of the first main spindle and the rotation of the second main spindle stop at the same time.SELECTED DRAWING: Figure 6

Description

The present invention relates to a friction welding apparatus for friction welding two works.

Conventionally, in machine tools such as automatic lathes, in other words, machine tools that perform cutting by gripping and rotating a long bar with a main shaft and pressing a cutting tool against it, the remaining material after separation of the machined work is removed. Friction bonding is performed for effective use (see Patent Document 1). In other words, the leftover bar material, which has become too long to be machined, is friction-bonded to a newly supplied bar material and used as a material for the next processing. can be reduced and the environmental impact can be reduced.

In friction welding, the sliding parts are softened by the frictional heat generated in the sliding parts of the two workpieces, and the sliding parts are joined by stopping the relative rotation of the sliding parts while applying pressure, thereby joining the two workpieces. It joins integrally. Specifically, the first work (new bar used in the next process) is gripped and rotated by the spindle (first spindle), and the second work (residual material left in the previous process) is rotated. is gripped by the back spindle (second spindle) and rotated. Then, by narrowing the axial distance between the main shafts and sliding the opposing end faces of the first work and the second work against each other, frictional heat is generated in the sliding portion. When the joint is sufficiently softened by friction, the relative rotation between the spindles is stopped while the pressure is maintained. When the heat is removed by stopping the rotation, the sliding portion solidifies in a joined state, and the remaining material and the new material are integrally joined.

Here, a large torque load is generated on the spindle that rotates the workpiece when the workpieces rotating at high speed come into contact with each other or when the rotation is stopped. In particular, when the rotation is stopped, the temperature of the sliding portion decreases as the stop control starts and approaches the stopped state, which reduces the degree of softening of the material and increases the sliding resistance at the sliding portion. A large torque load is applied. The longer the time from the start of deceleration to the completion of stop, the greater the progress of temperature drop and solidification of the sliding portion, and the greater the torque applied to the spindle mechanism at the time of stop. Also, the generation of excessive torque load may affect the quality of the joined product.

JP 2015-174179 A

An object of the present invention is to provide a technique capable of reducing the mechanical load in friction welding and stabilizing the welding quality.

In order to achieve the above object, the friction welding device of the present invention includes:
a first spindle mechanism rotatably provided with a first spindle for gripping a first workpiece;
A second spindle mechanism rotatably provided with a second spindle for gripping a second workpiece so as to face the first workpiece in the rotation axis direction, wherein the second spindle rotates with respect to the first spindle. a second spindle mechanism capable of relative movement in the axial direction;
a control unit that controls the first spindle mechanism and the second spindle mechanism;
with
After the first work and the second work, which rotate in mutually opposite directions, are brought into contact with each other in the direction of the rotation axis, and the sliding portion between the first work and the second work is softened by frictional heat. A friction welding device that joins the first work and the second work with the sliding portion by stopping the rotation of the first work and the second work,
the first main shaft mechanism and the second main shaft mechanism have different rotation stop capacities of the respective main shafts,
The control unit controls the first main shaft mechanism and the second main shaft mechanism based on the respective rotation stop capacities so that the rotation of the first main shaft and the rotation of the second main shaft are stopped at the same time. characterized by

According to the present invention, it is possible to reduce the mechanical load and stabilize the joint quality in friction welding.

1 is a schematic diagram of a friction welding device according to an embodiment of the present invention; FIG. FIG. 5 is an explanatory diagram of rotation stop time (rotation stop capability) of the front main shaft and the back main shaft; FIG. 5 is an explanatory diagram of rotation stop time (rotation stop capability) of the front main shaft and the back main shaft; It is a figure which shows the rotation stop time of this embodiment and a comparative example. FIG. 4 is a diagram showing torque loads of the present embodiment and a comparative example; 4 is a flow diagram of a friction-bonding process in Example 1. FIG. FIG. 10 is a flow diagram of a friction-bonding process in Example 2;

Preferred embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below merely exemplify preferred configurations of the present invention, and do not limit the scope of the present invention to those configurations. Also, in the following description, the hardware configuration and software configuration of the device, manufacturing conditions, functions of components, materials, shapes, their relative positions, etc. are within the scope of the present invention unless there is a specific description. It is not intended to be limited to In principle, the same constituent elements are given the same reference numbers, and repeated explanations are omitted.

(embodiment)
FIG. 1(a) is a schematic diagram schematically showing the configuration of a machine tool 1 as a friction welding device according to an embodiment of the present invention. The machine tool 1 shown in FIG. 1(a) is a so-called automatic lathe device, in which a workpiece W, which is, for example, a long bar, is rotated, and a cutting tool (processing tool) is applied to the workpiece W to perform cutting. It is a device for processing (turning). The machine tool 1 according to the present embodiment is a friction welding device that joins the remaining work W2 to the newly supplied work W1 when the machined work W can be cut out from one work W to the limit. It is also configured to be available as

The machine tool 1 generally includes a first spindle mechanism (front spindle mechanism) 100 and a second spindle mechanism (back spindle mechanism) 200 which are arranged opposite each other on a base (not shown), and a tool post (not shown). , provided. The first spindle mechanism 100 has a first spindle (front spindle) 101, the second spindle mechanism 200 has a second spindle (back spindle) 201, and these two spindles are They are arranged such that their axes are substantially concentric or parallel to each other. The axial direction is defined as the Z-axis direction, and among the directions orthogonal to the axial direction, the direction parallel to the vertical direction is defined as the X-axis direction, and the direction parallel to the horizontal direction is defined as the Y-axis direction. FIG. 1 is a schematic plan view of the configuration of the machine tool 1 viewed in the X-axis direction.

The second spindle mechanism 200 includes a drive mechanism GZ for moving a second spindle head 202 that rotatably supports a second spindle 201 on the base in the Z-axis direction. The drive mechanism GZ is a ball screw drive mechanism including a motor MZ as a drive source, a ball screw, a guide rail, and the like. The first spindle mechanism 100 may also include a drive mechanism for moving the first spindle stock 102, which rotatably supports the first spindle 101, on the base in the Z-axis direction. That is, the mechanism that allows the first spindle mechanism 100 and the second spindle mechanism 200 to move relative to each other in the Z-axis direction, which is the rotation axis direction of the spindle, is not limited to a specific configuration. Further, a drive mechanism may be provided to move the first headstock 102 and the second headstock 202 not only in the Z-axis direction but also in the Y-axis direction and the X-axis direction.

The first headstock 102 has, for example, a built-in motor (not shown), and is configured to rotate the first spindle 101 by its rotational driving force. Similarly, the second headstock 202 is also configured to rotate the second spindle 201 by a rotational drive force provided from a drive source (not shown). The power source configuration is not limited to a built-in motor, and may be a configuration that rotates by transmitting rotational driving force from an external power source.

The first spindle 101 has a hollow structure with a workpiece holding hole for holding or gripping the workpiece W1, and the workpiece W1 is gripped (the axial center of the workpiece W1 on the first spindle 101 is determined, A chuck and a chuck sleeve (not shown) are provided for the state in which movement in the axial direction is regulated). The work holding hole opens toward the second spindle side in the axial direction, and the portion of the work W1 exposed from the opening is turned by a cutting tool supported by a tool rest (not shown). become part. A guide bush, which is a support structure for the work W1, may be arranged in front of the first main spindle 101 .

In addition, the chuck and chuck sleeve (not shown) described above are configured such that the chuck sleeve is axially joined to the chuck, whose movement in the axial direction is restricted, from behind via the tapered surface. The chuck sleeve receives force from a fluid cylinder (not shown) driven by hydraulic pressure, air, or the like and tries to move in the axial direction, thereby exerting a force including a force component in the axial direction on the chuck. The clamping force is applied to the chuck so as to close the slit provided in the chuck. Thereby, a state of gripping the workpiece W1 is formed.

The configuration of the second spindle 201 side is, like the configuration of the first spindle 101 side, a configuration capable of gripping and rotating the workpiece W2. The basic configuration is similar to the conventionally known back spindle configuration. When the machine tool 1 is used as a friction welding device, the work W2 gripped by the second main spindle 201 is a residue left after it has been gripped by the first main spindle 101 and turned by the cutting tool of the tool rest. It becomes a workpiece as a material.

The machine tool 1 includes a control section configured by a computer having a processor such as a CPU (Central Processing Unit) and a memory. The control unit controls various operations of each unit that constitutes the machine tool 1, such as the spindle mechanisms 100 and 200, the tool post, and a work supply unit (not shown).

FIG. 1(b) is a schematic diagram showing a situation in which the work W1 and the work W2 are friction-welded by the machine tool 1 as the friction-welding apparatus according to the present embodiment. In addition, in FIG.1(b), illustration of the control part shown to Fig.1 (a) is abbreviate|omitted.

The machine tool 1 as a friction welding device softens the sliding portions by frictional heat generated in the sliding portions of the two works W1 and W2, and stops the relative rotation of the sliding portions while applying pressure. The two works W1 and W2 are integrally joined by joining the parts. A work W1 gripped by the first main spindle 101 is a new bar material prepared as a work piece for turning which is performed after the friction welding process. On the other hand, the work W2 gripped by the second spindle 201 is, as described above, a bar material left over from the turning process performed prior to the friction welding process.

First, as shown in FIG. 1A, the first main spindle 101 and the second main spindle 201 are rotated while the two works W1 and W2 are separated from each other in the Z-axis direction, which is the direction of the rotation axis. When the respective rotation speeds are stabilized at a predetermined rotation speed, the drive mechanism GZ moves the second main shaft 201 closer to the first main shaft 101 in the Z-axis direction.

Then, as shown in FIG. 1(b), the relative distance in the Z-axis direction between the first main spindle 101 and the second main spindle 201 is set to a predetermined distance between the facing end surfaces of the first workpiece W1 and the second workpiece W2. The first work W1 and the second work W2 are slid while being kept pressed against each other by contact pressure. Frictional heat is generated in the sliding portions of the first work W1 and the second work W2, and the sliding portions are in a softened state. When the sliding portion is sufficiently softened by friction and a high-temperature softened portion J is formed between the first work W1 and the second work W2, the relative rotation between the spindles is started while the pressure is maintained. to stop. When the rotation is stopped, the heat of the softened portion J is removed and solidified, so that the first work W1 and the second work W1 are separated from each other.
, and the workpiece W2 are integrally connected. As a result, a single bar is formed by integrating the remaining material and the new material.

Here, the first spindle mechanism 100 and the second spindle mechanism 200 have the ability to stop the rotation of their respective spindles. There may be a difference in the time it takes for the rotation to completely stop.

2 and 3, between a first spindle mechanism 100 that rotates a first spindle 101 as a front spindle and a second spindle mechanism 200 that rotates a second spindle 201 as a back spindle, The difference in rotation stop time (rotation stop capability) is shown. Between the first spindle mechanism 100 and the second spindle mechanism 200, for example, if there are differences in the types, sizes, weights, etc., of the respective components, the inertia generated in each spindle during rotation there is a difference in power. In particular, when the machine tool 1 for turning is also used as a friction welding device, the front spindle mechanism has a larger device configuration than the back spindle mechanism. tend to be larger than the back spindle mechanism.

Here, the ability to stop the rotation of the spindle mechanism is a comprehensive index based on the weight of the inertia body, the electrical stopping force, the mechanical stopping force, etc. included in the mechanism configuration. Alternatively, a size comparison can be obtained, for example, from experimental results as shown in FIG.

As shown in FIG. 2, when the two main shafts are rotated at the same speed, the front main shaft takes longer than the back main shaft to start deceleration and stop. Note that there may be a difference in the number of rotations (maximum number of rotations) that can be controlled between the front spindle mechanism and the back spindle mechanism. The mechanism may have greater inertia force than the back spindle mechanism.

In the machine tool 1 as the friction welding device according to the present embodiment, the rotation stop control start timing and the like are adjusted so that the rotation stop timings of the first main spindle 101 and the second main spindle 202 coincide with each other. It controls the bonding process. As a method for matching the rotation stop timings of the two spindles, for example, considering the difference in rotation stopping ability between the first spindle mechanism 100 and the second spindle mechanism 200, the respective rotation speeds are adjusted to a predetermined value. , and a time difference is provided in the timing of starting rotation stop control, that is, the timing of starting deceleration. More specific configuration examples will be described later using examples.

As shown in FIG. 3, in order to stop the first main shaft 101 and the second main shaft 201 rotated at the same number of revolutions at the same stop timing TS, the deceleration timing T1 of the first main shaft 101 is changed to 2 must be set earlier than the deceleration timing T2 of the spindle 201 of No. 2. The first main spindle mechanism 100, which rotates the first main spindle 101 as the front main spindle, generates a large inertial force when the first main spindle 101 rotates. The time is longer than that of the second main axis 201 as the back main axis. Therefore, the time difference between the deceleration timing T1 and the deceleration timing T2 is set based on the difference in time required from the start of deceleration of the first spindle 101 and the second spindle 201 to the stop of rotation.

Advantages of friction welding process control in this embodiment will be described.

The degree of softening of the sliding portions of the two works decreases as the relative rotation speed between the two works decreases, and the lower the degree of softening, the greater the sliding resistance at the sliding portions. Therefore, the longer the stop control time (period) from the start of stop control (start of deceleration) to the stop of rotation, the greater the decrease in the degree of softening at the time of stop, and the greater the torque load generated on the spindle just before the stop. become a thing. Therefore, in order to reduce the torque load, it is preferable to stop the rotation of the main shaft as soon as possible while the softened state is maintained, that is, before the material cools down and the torque load increases.

Also, if there is a difference in stop timing between the two main shafts, there is a possibility that an excessive torque load will be applied to each of the rotation mechanisms of the two main shafts. In the machine tool 1, it is not preferable from the viewpoint of maintenance, equipment life, etc. that the mechanical load on the mechanism on the side of the front spindle, which is used relatively frequently, becomes large. Therefore, it is preferable that the two main shafts stop rotating at the same timing.

FIG. 4 shows the rotation stop time in the friction welding configuration of the present embodiment and, as a comparative example, the rotation stop time in a configuration in which only one of the main shafts is rotationally driven and two workpieces are relatively rotated to perform friction welding. It is a graph shown for comparison. FIG. 4(a) shows the rotation stop time of the comparative example, and FIG. 4(b) shows the rotation stop time of this embodiment.

In the configuration of the comparative example in which only one of the main shafts is rotationally driven, the rotation stopping time is fixed by the number of rotations required for friction welding and the rotation stopping capability of the main shaft. The rotation stop capability of the spindle mechanism, typically the time required from the start of rotation stop control until the rotation stops, is a parameter specific to each mechanism configuration based on the inertial force of the rotor in each mechanism configuration. Become. For example, in the comparative example of FIG. 4A, it takes 0.6 seconds to stop the rotation, and the rotation of the spindle cannot be stopped in a shorter time.

On the other hand, in this embodiment, the two main shafts are rotated in directions opposite to each other, so that the two workpieces are rotated at a predetermined relative rotation speed. By performing the rotation stop control of the two spindles substantially simultaneously in such a configuration, the time from the start of the rotation stop control to the rotation stop is shorter than the configuration of the comparative example in which only one of the two spindles is rotationally driven. be able to. Further, in the present embodiment, the relative number of revolutions determined by the number of revolutions of one main shaft and the number of revolutions of the other main shaft is within a range in which a predetermined number of revolutions required for friction welding can be obtained. can be set arbitrarily. That is, for the front main spindle, which has a large inertial force and a low rotation stopping ability, the rotational speed is set as low as possible in order to shorten the time required for stop control. On the other hand, for the back spindle, which has a small inertial force and high rotation stoppage capability, the time required for stop control can be shortened compared to the front spindle even if the rotation speed is increased. Set to high RPM. As a result, in the configuration example of this embodiment shown in FIG. 4B, the time required for stop control can be shortened to 0.2 seconds.

FIG. 5 is a graph showing a comparison between the torque load generated in the friction-bonded structure of this embodiment and the torque load generated in the friction-bonded structure of the comparative example (only one main shaft is driven to rotate). FIG. 5(a) shows the torque load of the comparative example, and FIG. 5(b) shows the torque load of this embodiment. In each of FIGS. 5(a) and 5(b), the peak value on the left side of the figure is the torque load generated at the timing when two rotating works are brought into contact with each other. In each of FIGS. 5(a) and 5(b), the fact that the torque load becomes zero after the peak on the right side of the figure indicates that the spindle has stopped rotating. is the torque load that occurs when the rotation stops.

In the configuration of the comparative example, as shown in FIG. 4(a), it takes time to stop the rotation, so the temperature drop in the sliding portion of the two works is large when approaching the stop state, and the degree of softening of the material decreases. The sliding resistance at the sliding portion tends to increase due to the decrease. Therefore, as shown in FIG. 5(a), a torque load larger than the torque load when bringing two works into contact may occur.

On the other hand, in the present embodiment, as shown in FIG. 4(b), the time required for stopping the rotation can be made shorter than in the comparative example. , an increase in sliding resistance at the sliding portion is suppressed. Therefore, as shown in FIG. 5(b), the peak value generated immediately before the rotation is stopped can be significantly reduced compared to the peak value of the comparative example shown in FIG. 5(a).

An example, which is a more specific configuration example of the friction welding method of the present embodiment, will be described.

<Example 1>
FIG. 6 is a flow chart of the friction-bonding process of Example 1 of the present invention. In the first embodiment, the rotational speeds of the two main shafts are each set to a predetermined rotational speed according to the rotation stopping capability, and the deceleration start timing is adjusted so that the rotation of the two main shafts stops at the same time.

That is, the first spindle is rotated at a first rotation speed and the second spindle is rotated at a second rotation speed (S101). Different rotation speeds may be set for the first spindle and the second spindle (first rotation speed ≠ second rotation speed). For example, as shown in FIG. 4(b), the rotational speed of the front main shaft, which has a large inertia of the rotating object, is reduced, and the rotational speed of the back main shaft, which has a low inertia of the rotating object, within the range where the relative rotational speed required for friction welding can be secured. You can increase the number of revolutions.

When the rotation of each of the first spindle and the second spindle is stabilized, the tip surfaces of the workpieces gripped by the respective spindles are brought into pressure contact to soften the sliding portions of the two workpieces by frictional heat (S102).

When the sliding portions of the two workpieces are sufficiently softened, deceleration of the first spindle is started at the first deceleration timing (S103), and deceleration of the second spindle is started at the second deceleration timing (S104). . In this embodiment, the first spindle, which has a low rotation stopping capability (it takes a long time to stop rotation), is decelerated at an earlier timing than the deceleration of the second spindle. By setting each timing based on the rotation stopping capability of each spindle, it is possible to match the stop timings of the two spindles (S105).

As described above, according to the friction-joining process of the present embodiment, the stop time of the entire friction-joining process is shortened by simultaneously completing the stoppage of the rotation of both shafts while ensuring the relative number of rotations necessary for friction-joining. becomes possible. Since the rotation stop time is shortened, the rotation of the main spindle can be stopped in a state in which the material is softened further, so that the torque load generated when the rotation is stopped can be suppressed.

The number of revolutions of the first main shaft and the number of revolutions of the second main shaft may be the same. In the case of an apparatus in which both the front main shaft and the back main shaft have a maximum rotation speed of 5000 rpm, joining may be performed at the maximum rotation speed. By setting the rotation speed of both shafts to 5000 rpm and decelerating the main shaft with the higher stopping ability first and then decelerating the main shaft with the lower stopping ability, the joint surfaces of the two workpieces generate the most heat. Rotation stop can be completed while holding.

<Example 2>
FIG. 7 is a flow chart of the friction bonding process of Example 2 of the present invention. In the second embodiment, the timing for starting deceleration and the timing for completing stoppage are made to coincide with each other in the rotation stop control of the two spindles. In order to match those timings, the setting of the rotation speed of each spindle is adjusted according to the rotation stopping capability of each.

That is, the first spindle is rotated at the third rotation speed, and the second spindle is rotated at the fourth rotation speed (S201). The third rotation speed and the fourth rotation speed are set so that the rotation stop time of the first spindle and the rotation stop time of the second spindle are the same stop time (first stop time). be. Since the first main shaft and the second main shaft have different rotation stop capacities, the third rotation speed and the fourth rotation speed have different values. For example, the rotation speed (third rotation speed) of the first main spindle as the front main spindle having a large inertia of the rotating body is the number of rotations (the fourth rotation speed) of the second main spindle serving as the back main spindle having a low inertia of the rotating body. number), and the stop time is set to be the same.

When the rotation of each of the first spindle and the second spindle is stabilized, the tip surfaces of the workpieces gripped by the respective spindles are pressed against each other, and the sliding portions of the two workpieces are softened by frictional heat (S202).

When the sliding portions of the two works are sufficiently softened, the deceleration of the first spindle and the deceleration of the second spindle are started at the same timing (S203). As described above, the rotation speed of each spindle is set so that the time required for rotation stoppage is the same according to the rotation stoppage capability of each spindle. Therefore, the two spindles stop at the same timing (S204).

According to the friction bonding process of Example 2, there is no deviation in the timing of deceleration start as in Example 1, so the time from when the relative rotation speed starts to decrease to when the relative rotation speed becomes zero is It can be shorter than the control of 1. Therefore, it is possible to more effectively suppress the torque load generated when the rotation is stopped.

According to the embodiments and examples of the present invention, the rotation speed is set to a value that matches the inertia of the rotating object of each spindle, and the spindles are rotated in mutually opposite directions, thereby shortening the time required to stop rotation. and the torque load generated when the rotation is stopped can be reduced. As a result, damage to jigs and workpieces due to excessive torque load can be suppressed. In addition, it is possible to improve the bonding strength of the bonded product and the stability of specific phase bonding when friction bonding works of different types.

Further, according to the present embodiment and example, it is possible to shorten the rotation stop time of the spindle during friction welding without changing the existing machine configuration of the machine tool 1 . That is, there is no need to add a special device configuration separately, and effects such as reduction of mechanical load and stabilization of joint quality when used as a friction welding device can be obtained easily at low cost.

<Others>
The method of matching the stop timings of the two spindles is not limited to the methods described in the above embodiments and examples. For example, the stop operation of the spindle may be controlled by controlling the drive power of the motor. That is, the rotation stopping operation of each spindle may be electrically controlled by adjusting the current/voltage so that a force in the opposite direction is generated according to the rotation stopping capability.
Further, the rotation stopping operation of each main shaft may be mechanically controlled by externally applying and controlling a braking force to the main shaft by braking means such as a brake.

DESCRIPTION OF SYMBOLS 1... Machine tool, 100... 1st spindle mechanism, 101... 1st spindle, 102... 1st headstock, 200... 2nd spindle mechanism, 201... 2nd spindle, 202... 2nd headstock, GZ... drive mechanism, W1... First work, W2... Second work

Claims (8)

a first spindle mechanism rotatably provided with a first spindle for gripping a first workpiece;
A second spindle mechanism rotatably provided with a second spindle for gripping a second workpiece so as to face the first workpiece in the rotation axis direction, wherein the second spindle rotates with respect to the first spindle. a second spindle mechanism capable of relative movement in the axial direction;
a control unit that controls the first spindle mechanism and the second spindle mechanism;
with
After the first work and the second work, which rotate in mutually opposite directions, are brought into contact with each other in the direction of the rotation axis, and the sliding portion between the first work and the second work is softened by frictional heat. A friction welding device that joins the first work and the second work with the sliding portion by stopping the rotation of the first work and the second work,
the first main shaft mechanism and the second main shaft mechanism have different rotation stop capacities of the respective main shafts,
The control unit controls the first main shaft mechanism and the second main shaft mechanism based on the respective rotation stop capacities so that the rotation of the first main shaft and the rotation of the second main shaft are stopped at the same time. A friction welding device characterized by: The control unit
so that the rotation of the first main shaft and the rotation of the second main shaft are stopped at the same time,
setting a first deceleration timing at which the first main shaft mechanism starts decelerating the rotation of the first main shaft based on the rotation stopping capability of the first main shaft mechanism;
2. The friction according to claim 1, wherein the second deceleration timing at which the second main shaft mechanism starts decelerating the rotation of the second main shaft is set based on the rotation stopping capability of the second main shaft mechanism. Welding equipment. The control unit
so that the rotation of the first main shaft and the rotation of the second main shaft are stopped at the same time,
setting a first rotation speed at which the first spindle mechanism rotates the first spindle based on the rotation stopping capability of the first spindle mechanism;
2. The friction welding apparatus according to claim 1, wherein a second rotation speed at which said second main shaft mechanism rotates said second main shaft is set based on said rotation stopping capability of said second main shaft mechanism. the number of revolutions at which the first main shaft mechanism rotates the first main shaft and the number of revolutions at which the second main shaft mechanism rotates the second main shaft are the same;
2. The timing at which the first spindle mechanism starts decelerating the rotation of the first spindle and the timing at which the second spindle mechanism starts decelerating the rotation of the second spindle are different. The friction welding device according to . The number of revolutions at which the first main shaft mechanism rotates the first main shaft is different from the number of revolutions at which the second main shaft mechanism rotates the second main shaft,
2. The timing at which the first spindle mechanism starts decelerating the rotation of the first spindle and the timing at which the second spindle mechanism starts decelerating the rotation of the second spindle are different. The friction welding device according to . The number of revolutions at which the first main shaft mechanism rotates the first main shaft is different from the number of revolutions at which the second main shaft mechanism rotates the second main shaft,
The timing at which the first main shaft mechanism starts decelerating the rotation of the first main shaft and the timing at which the second main shaft mechanism starts decelerating the rotation of the second main shaft are the same. Item 1. The friction welding device according to item 1. When the first main shaft mechanism and the second main shaft mechanism respectively rotate the first main shaft and the second main shaft at the same rotational speed, the first main shaft mechanism stops rotating after deceleration of the first main shaft is started. The friction welding device according to any one of claims 1 to 6, characterized in that the time required for the second main shaft mechanism to stop rotating from the start of deceleration of the second main shaft is different from the time required until . a first spindle mechanism rotatably provided with a first spindle for gripping a first workpiece;
A second spindle mechanism rotatably provided with a second spindle for gripping a second workpiece so as to face the first workpiece in the rotation axis direction, wherein the second spindle rotates with respect to the first spindle. a second spindle mechanism capable of relative movement in the axial direction;
a control unit that controls the first spindle mechanism and the second spindle mechanism;
with
After the first work and the second work, which rotate in mutually opposite directions, are brought into contact with each other in the direction of the rotation axis, and the sliding portion between the first work and the second work is softened by frictional heat. A friction welding device that joins the first work and the second work with the sliding portion by stopping the rotation of the first work and the second work,
the first main shaft mechanism and the second main shaft mechanism have different rotation stop capacities of the respective main shafts,
The control unit controls the first main shaft mechanism and the second main shaft mechanism based on the respective rotation stop capacities so that the rotation of the first main shaft and the rotation of the second main shaft are stopped at the same time. A friction welding method characterized by:

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