KR100375257B1 - method for connecting workpieces - Google Patents

Abstract

Improved workpiece bonding apparatus 10 capable of coping with a wide range of intermediate workpieces W1. The joining apparatus 10 has a work base 11, a pair of rotary units 13 and 14, and a vise 20 for holding the intermediate workpiece W1. On the work base 11, a pair of guide rails 12 are provided. Each rotating unit 13, 14 is installed on the guide rail 12 and is moved along the guide rail 12 by the slide mechanisms 16, 17, 18, 19. The left workpiece W2 and the right workpiece W3 to be joined are held in the rotating units 13 and 14, respectively. Each rotating unit 13, 14 rotates the workpieces W2, W3. The vise 20 is arranged between both rotary units 13 and 14 on the work base. Since the intermediate workpiece W1 is usually held by one vise 20, the joining device 10 enables bonding to the short intermediate workpiece W1.

Description

Method for connecting workpieces

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workpiece joining apparatus for joining a plurality of workpieces and a joining method thereof, and more particularly, to joining a workpiece by generating frictional heat between a plurality of workpieces and using the frictional heat. It relates to a workpiece joining apparatus and a joining method thereof.

The friction welding method is well known as a method for joining a plurality of workpieces in the axial direction thereof. According to the method, a plurality of workpieces to be joined are arranged in a line in the axial direction. The plurality of workpieces are relatively rotated about their axes while pressing the cross-sections of the opposing workpieces. Then, frictional heat is generated at each contact surface, the metal of each contact surface is softened by the heat, and both end surfaces are joined. When the metal of the contact surface hardens, a plurality of workpieces are joined to obtain one workpiece.

According to this joining method, joining of several workpiece | work made of a dissimilar metal is possible, unnecessary waste of material and electrical energy is reduced, and productivity and joining accuracy are excellent. Therefore, it is widely applied to joining materials, such as a rod and a pipe, especially as a joining method for large quantity production.

4 to 6 show a conventional workpiece bonding apparatus. Three workpieces W11, W12, and W13 are joined by this joining apparatus. The apparatus of FIG. 4 is equipped with the work base 30, and the joining operation is performed in the upper surface 30a. On the upper surface 30a, the left guide rail 34 and the right guide rail 40 are arranged along the Y axis shown by the arrow. The left unit 31 is provided on the left guide rail 34, and the right unit ( 32 is provided on the right guide rail 40. Each unit 31, 32 can move along a corresponding guide rail 34, 40.

The left unit 31 has a left main shaft 31a, a left cover 31b, a left gear 31c, a left servomotor 31d and a left chuck 31e. The left main shaft 31a is rotated by the left servomotor 31d via the left gear 31c. The left chuck 31e is for holding the workpiece W12 and is rotatably mounted integrally with the left main shaft 31a at the tip of the left main shaft 31a. The left gear 31c and the left main shaft 31a are covered with the left cover 31b.

The right unit 32 has a right main shaft 32a, a right cover 32b, a right gear 32c, a right servomotor 32d and a right chuck 32e. The right main shaft 32a is rotated by the right servomotor 32d via the right gear 32c. The right chuck 32e is for holding the workpiece W13 and is rotatably mounted integrally with the right spindle 32a at the tip of the right spindle 32a. The right gear 32c and the right main shaft 32a are covered with the right cover 32b.

In the work base 30, the left shaft 37 and the right shaft 38 which have male threads, respectively, are horizontally arrange | positioned. The left shaft 37 is driven by the left servomotor 36, and the right shaft 38 is driven by the right servomotor 41. The left arm 35 protrudes downward from the bottom of the left unit 31. The left arm 35 has a female thread corresponding to the left shaft 37. When the left shaft 37 is rotated, the left unit 31 slides along the Y axis. The slide direction of the left unit 31 is determined in accordance with the rotation direction of the left shaft 37. Similarly, the right arm 39 protrudes downward from the bottom surface of the right unit 32. The right arm 39 has a female thread corresponding to the right shaft 38. When the right shaft 38 is rotated, the right unit 32 slides along the Y axis.

A fixed vise 42 and a moving vise 43 are disposed between the left and right units 31 and 32. The intermediate workpiece W11 is sandwiched between both vices 42 and 43. The moving vise 43 is provided on the right guide rail 40. The moving vise 43 can slide on the Y axis along the right guide rail 40 and can be fixed at an arbitrary position.

As shown in FIGS. 4-6, the fixed vise 42 is provided with the leg part 42a and the pair of clamps 42b and 42c. The leg part 42a is being fixed to the upper surface 30a. The clamps 42b and 42c move in the horizontal direction perpendicular to the Y axis with respect to the leg portion 42a, and sandwich the intermediate workpiece W11 therebetween. The movable vise 43 also includes a leg 43a and a pair of clamps 43b and 43c. The clamps 43b and 43c move in the horizontal direction perpendicular to the Y axis with respect to the leg portion 43a, and sandwich the intermediate workpiece W11 therebetween.

The stationary vise 42 and the movable vise 43 are intermediate workpieces such that the center axes of the intermediate workpieces W11 coincide with the center axes of the workpieces W12 and W13 held in the left and right units 31 and 32. The piece W11 is sandwiched and supported.

When joining three workpieces W11, W12, and W13, as shown in Figs. 4 and 6, first, the intermediate workpiece W11 is held in the stationary vise 42 and the moving vise 43. At this time, the intermediate workpiece W11 is balanced by moving the moving vise 43 according to the length L5 of the intermediate workpiece W11 to adjust the distance between the moving vise 43 and the fixed vise 42. Support

Next, the workpieces W12 and W13 are held at the left and right chucks 31e and 32e, respectively. The workpieces W12 and W13 are rotated by predetermined rotational speeds by the rotation servomotors 31d and 32d, respectively.

When the shafts 37 and 38 are rotated in a predetermined direction by the slide servomotors 36 and 41, the left and right units 31 and 32 slide along the Y axis toward the intermediate workpiece W11, respectively.

When each end surface of the rotating workpieces W12 and W13 contacts both end faces of the intermediate workpiece W11, frictional heat is generated at the contact surfaces. This frictional heat softens the contact surfaces of the workpieces W11, W12, and W13. After the softening proceeds to the desired state, the rotation of the workpieces W12 and W13 is stopped, and the workpieces W12 and W13 are pressed toward the intermediate workpiece W11. Then, each contact surface of the workpieces W12 and W13 is pressed at the atomic level to each contact surface of the intermediate workpiece W11, so that the three workpieces are integrated. In this way, one workpiece is obtained.

In such a joining process, positioning, ie, phase alignment, of the rotational position after joining the workpieces W12 and W13 to the intermediate workpiece W11 is required. This phase alignment is realized by controlling the stop positions of the left and right servomotors 31d and 32d. When the workpieces W12 and W13 are stopped by this control, the phase (rotational stop position) with respect to the intermediate workpiece W11 is provided.

By the way, in the case where the three workpieces W11, W12, W13 are integrally bonded by this apparatus, the minimum length of the joinable intermediate workpiece W11 is Y of the fixed vise 42 and the movable vise 43. Depends on the distance along the axis. Here, as shown in FIG. 4, the length along the Y axis of the fixed vise 42 is L4L, the length along the Y axis of the moving vise 43 is L4R, and the length of the intermediate workpiece W11 is L5. Shall be. When the length L5 of the intermediate workpiece W11 is longer than L4L + L4R, the workpieces W12 and W13 can be press-contacted to the intermediate workpiece W11. On the contrary, if the length L5 of the intermediate workpiece W11 is equal to or shorter than L4L + L4R, the workpieces W12 and W13 cannot be pressed against the intermediate workpiece W11.

Therefore, in order to reduce the value of L4L + L4R, one of the vises 42 and 43 was omitted. For example, the fixed vise 42 is omitted, and the intermediate workpiece W11 is held only by the movable vise 43. However, the device of this configuration is suitable for the short intermediate workpiece W11 but not for the intermediate workpiece W11 which is much longer than the moving vise 43. Because, when the long intermediate workpiece W11 is held only by the movable vise 43, one end or both ends of the intermediate workpiece W11 protrude from the movable vise 43 long. For this reason, when the workpieces W12 and W13 are press-contacted to the intermediate workpiece W11, the protruding portions of the intermediate workpiece W11 are biased (deviated from the center). The bias lowers the accuracy of the pressure welding process.

It is a first object of the present invention to provide a workpiece joining apparatus and a method thereof, which can cope with joining workpieces of a wide range of lengths. A second object of the present invention is to provide an inexpensive workpiece joining apparatus.

1 is a front view showing the workpiece bonding apparatus of the first embodiment of the present invention.

FIG. 2 is a right side view of the workpiece bonding apparatus of FIG. 1. FIG.

3 is a plan view showing the workpiece bonding apparatus of FIG.

4 is a front view showing a workpiece bonding apparatus of the prior art.

FIG. 5 is a left side view of the workpiece bonding apparatus of FIG. 4. FIG.

FIG. 6 is a plan view illustrating the workpiece bonding apparatus of FIG. 4. FIG.

* Explanation of symbols for main parts of the drawings

10: workpiece joining device 11: working base

12: guide rail 13: left unit

13d: Rotary Servo Motor 14: Right Side Unit

17: Slide servo motor 20: Vise

20b, 20c: clamp

W1, W2, W3: Workpiece

In order to achieve the above object, the present invention provides a joining apparatus for press-welding a plurality of workpieces by generating frictional heat between the plurality of workpieces and softening the workpieces by the frictional heat. The joining device includes a work base, a guide member provided on the work base, and a first and a second work piece for holding and rotating the first and second workpieces that are movable on the guide member and to be joined, respectively. A single vise for holding a second rotating unit, a slide mechanism for moving the first and second rotating units along the guide member and fixing it to a workpiece bonding position on the guide member, and a third workpiece W1; Equipped with. The single vise is installed between the first and second rotating units on the working base and can move along the guide member.

In the present invention, a single vise has a pair of clamps for holding the third workpiece. The length L3 of each clamp along the guide member is made shorter than the lengths L1 and L2 of the third workpiece.

In the present invention, the first and second rotating units can support the first and second workpieces coaxially with respect to the third workpiece, respectively.

In the present invention, one of the first and second rotating units may restrict the movement of the third workpiece held in the single vise in the direction along the guide member.

In the present invention, one rotation stop position of the first and second rotation units is controlled based on the rotation stop position of the other rotation unit.

In the present invention, the first and second rotary units are provided with motors for rotating the first and second workpieces, respectively. The motor of one rotating unit is a servo motor, and the motor of the other rotating unit uses a type other than the servo motor.

In the present invention, in the workpiece joining method for joining the first, second, and third workpieces by generating frictional heat between the first, second, and third workpieces (W1, W2, W3), the first A third workpiece W1 is disposed between the workpiece W2 and the second workpiece W3 and coaxially with the first and second workpieces, thereby near the one end of the third workpiece W1. The first workpiece on the other end surface of the third workpiece W1 so as to restrict the movement of the third workpiece W1 held by the single vise 20 and the step of holding the same by the single vise 20. Contacting one end face of the piece and pressing the second work piece to the third work piece by pressing the second work piece W3 to one end face of the third work piece W1 while rotating the second work piece W3. 1 bonding step, the step of holding the other end of the third workpiece (W1) in the vicinity of the single vise, and And a second joining step of joining the first workpiece to the third workpiece by pressing the other workpiece of the third workpiece while rotating the one workpiece W2. Is provided.

In the present invention, further comprising the step of sliding the single vise from near one end of the third workpiece to near the other end prior to the step of maintaining the other end of the third workpiece by the single vise. It provides a workpiece bonding method comprising a.

In the present invention, the second joining step provides a workpiece joining method comprising the step of controlling the rotation stop position of the first workpiece based on the rotation stop position of the second workpiece.

According to the present invention, since one vise is required and a fixed vise is unnecessary, the manufacturing cost of the joining device is reduced. It also allows for joining a wide range of length workpieces.

According to the present invention, bonding to short workpieces is possible.

According to this invention, a some workpiece can be joined coaxially.

According to the invention, the movement of the third workpiece held in the movable single vise is regulated by the first or second rotating unit.

According to the present invention, the first and second workpieces can be joined in phase with respect to the third workpiece.

According to the present invention, the joining apparatus is manufactured at low cost as compared with the case of employing a servomotor for two motors.

According to the present invention, bonding to a wide range of length workpieces is possible. Moreover, a some workpiece can be joined coaxially. Movement of the third workpiece held in the movable vise is regulated by the first or second rotating unit. Moreover, a dedicated member for fixing a single vise on the guide member is unnecessary.

Features believed to be novel of the invention are particularly apparent in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be understood along with the objects and advantages by the description of the preferred embodiments at the present time shown below with reference to the accompanying drawings.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

1 to 3 show the workpiece bonding apparatus 10 of this embodiment. The workpiece bonding apparatus 10 has a work base 11. On the upper surface 11a of the work base 11, two linear guide rails 12 parallel to each other are provided.

In FIG. 1, the left unit 13 is provided on the upper left side of the work base 11 so as to be movable along the guide rail 12. On the upper right side of the work base 11, the right side unit 14 is provided to be movable along the guide rail 12 so as to face the left side unit 13.

As shown in Fig. 3, the left unit 13 has a left cover 13a, a main shaft 13b, a left gear 13c, and a rotating servomotor 13d. A chuck 13e is attached to the tip of the main shaft 13b. The main shaft 13b and the left gear 13c are covered with the left cover 13a. The rotating servomotor 13d is fixed on the left cover 13a. The rotary servomotor 13d drives the main shaft 13b via the left gear 13c.

As shown in FIG. 1, the arm 13g protrudes downward from the bottom face 13f of the left cover 13a. The arm 13g is located in the work base 11. A female screw 13h is formed at the tip end of the arm 13g.

As shown in Fig. 1, the shaft 16 having a male screw on its outer circumference is rotatably supported by the work base 11 and screwed to the female screw 13h. When the shaft 16 is rotated, the arm 13g moves linearly along the shaft 16 and the left cover 13a moves linearly along the guide rail 12.

The slide servomotor 17 is provided on the left side of the work base 11. The shaft 16 is driven by this servomotor 17.

As shown in Figs. 1 and 2, the right unit 14 includes a right cover 14a, a right main shaft 14b, pulleys P1 and P2, an induction motor 14d and a right chuck 14e. Have The driven pulley P1 is fixed to the proximal end of the right main shaft 14b. The right chuck 14e is attached to the tip of the right main shaft 14b. An induction motor 14d is attached to the outer surface of the right cover 14a. The drive pulley P2 is fixed to the output shaft of the induction motor 14d. The driven pulley P1 and the driving pulley P2 are connected via the belt 14c. The central axis of the right main axis 14b coincides with the central axis of the main axis 13b of the left unit 13.

The arm 14g protrudes downward from the bottom face 14f of the right cover 14a. The arm 14g is located in the work base 11. A female screw 14h is formed at the tip of the arm 14g.

As shown in Fig. 1, the shaft 18 having a male screw on its outer circumference is rotatably supported by the work base 11 and screwed to the female screw 14h. When the shaft 18 is rotated, the arm 14g moves linearly along the shaft 18 and the right cover 14a moves linearly along the guide rail 12. The slide servomotor 19 is provided on the right side of the work base 11. The shaft 18 is driven by the servomotor 19.

A vise 20 for holding the intermediate workpiece W1 is arranged on the guide rail 12 between the left and right units 13, 14. The vise 20 may move along the guide rail 12 in the Y-axis direction. As shown in Figs. 2 and 3, the vise 20 includes a leg 20a and a pair of clamps 20b and 20c. The clamps 20b and 20c open in a direction perpendicular to the Y axis and can hold the intermediate workpiece W1.

Next, the operation of the workpiece bonding apparatus 10 will be described.

In the workpiece bonding apparatus 10, three workpieces W1, W2, and W3 are joined in stages. That is, in the first step, the right workpiece W3 is joined to the intermediate workpiece W1. Next, the left workpiece W2 is joined to the intermediate workpiece W1 in the second step.

As shown in FIGS. 1 and 3, the intermediate workpiece W1 has a length indicated by L2. The clamps 20b and 20c have a length L3 in the axial direction (Y axis). If the length L2 is slightly longer than the length L3, the intermediate workpiece W1 is held by the vise 20 at its center. The left workpiece W2 is held by the chuck 13e of the left unit 13. The right workpiece W3 is held by the right chuck 14e of the right unit 14. Next, the left unit 13 is moved and the left workpiece W2 is brought into contact with the intermediate workpiece W1. Then, the movement to the left side of the vise 20 and the intermediate workpiece W1 is restricted by the left unit 13 and the left workpiece W2. In other words, the left unit 13 serves as a stopper of the intermediate workpiece W1.

Next, the right main shaft 14b is rotated by the motor 14d, and the right unit 14 is slid toward the intermediate workpiece W1 while rotating the right workpiece W3 at a predetermined rotation speed. When the rotating right workpiece W3 is brought into contact with the non-rotating intermediate workpiece W1, frictional heat is generated on the joining surfaces of the two workpieces W1 and W3, and the two workpieces W1 and W3 are used as the frictional heat. The joint surface of is softened. After softening to the desired state, the rotation of the right workpiece W3 is stopped, and an upset pressure is applied to both workpieces W1 and W3 along the axial direction of both workpieces W1 and W3 to complete the joining. . Then, the contact surfaces of the two workpieces W1 and W3 are pressed against each other to join the workpieces W1 and W3.

After this joining, the rotation stop position of the right main shaft 14b is detected by a sensor (not shown). This position is, for example, the reference stop position (phase) of the right main shaft 14b when the right workpiece W3 is mounted on the main shaft 14b, and the right main shaft at the end of the joining of the workpieces W1, W3. This is obtained by comparing the stop positions of 14b). In order to match the phases of the joined workpieces W1 and W3 and the left workpiece W2, the middle workpiece W1 is released from the vise 20 once. Then, the workpieces W1 and W3 are rotated together with the right main shaft 14b to adjust the stop positions of the workpieces W1 and W3. This is called spindle orientation. After the end of the orientation, the intermediate workpiece W1 is held back in the vise 20. On the other hand, the left unit 13 holding the left workpiece W2 returns to the left until the predetermined position.

Next, the main shaft 13b is rotated by the rotary servomotor 13d to rotate the left workpiece W2 at a predetermined rotational speed. At the same time, the left unit 13 is moved toward the intermediate workpiece W1 via the shaft 16 by the slide servomotor 17. When the rotated left workpiece W2 comes in contact with the end face of the non-rotated intermediate workpiece W1, frictional heat is generated on the contact surfaces of both workpieces W1 and W2. The frictional heat softens the contact surfaces of the workpieces W1 and W2. After the softening proceeds to the desired state, the rotation of the left workpiece W2 is stopped. The stop position of the left workpiece W2 is controlled by the servomotor 13d, and the left workpiece W2 is stopped at a position where the phases are summed with the right workpiece W3, which is determined more than the main axis orientation. Simultaneously stop rotation and apply upset pressure to workpieces W2 and W1. Then, the contact surfaces of the two workpieces (W1, W2) are pressed into each other to join the two workpieces (W1, W2). Thus, three workpieces W1, W2, and W3 are joined to obtain one workpiece.

By the workpiece bonding apparatus 10 of this embodiment, the left workpiece W2 and the right workpiece W3 can be bonded to the short intermediate workpiece W1. Moreover, the position of the rotation direction of the left workpiece | work W2 and the right workpiece | work W3 can be matched and bonded exactly.

Next, as shown by the dashed-dotted line in FIG. 1, the case where the left workpiece | work W2 and the right workpiece | work W3 are joined to the elongate intermediate workpiece | work W1 of length L1 is demonstrated. The length L1 of the intermediate workpiece W1 is much longer than the length L3 in the Y-axis direction of the clamps 20b and 20c. The left workpiece W2 is held by the chuck 13e of the left unit 13. The right workpiece W3 is held by the right chuck 14e of the right unit 14.

First, as shown in FIGS. 1 and 3, the intermediate workpiece W1 is held by the vise 20 near its right end. The length of the intermediate workpiece | work W1 which protrudes to the right by the vise 20 is set to the length which does not bend during a joining operation.

The left unit 13 is moved to a position where the left end surface of the intermediate workpiece W1 is in contact with the right end surface of the left workpiece W2. By the left unit 13, the movement in the axial direction of the intermediate workpiece W1 held by the vise 20 is constrained during the joining operation.

Next, the right main shaft 14b is driven by the motor 14d to rotate the right workpiece W3 at a predetermined rotational speed. At the same time, the shaft 18 is rotated in the predetermined rotation direction by the slide servomotor 19 to move the right unit 14 toward the intermediate workpiece W1. When the rotating right workpiece W3 is brought into contact with the non-rotating intermediate workpiece W1, frictional heat is generated on the contact surfaces of both workpieces W1 and W3. The frictional heat softens the contact surfaces of both workpieces W1 and W3. After the softening proceeds to the desired state, the rotation of the right workpiece W3 is stopped, and at the same time, an upset pressure is applied between the workpieces W1 and W3. As a result, the contact surfaces of the two workpieces W1 and W3 are pressed against each other and the two workpieces W1 and W3 are joined.

After joining both workpieces W1 and W3, the clamps 20b and 20c are released, and the vise 20 is moved near the left end of the intermediate workpiece W1. The left unit 13 is returned to a predetermined position. Thereafter, the rotation stop position of the right main shaft 14b is detected, and the main shaft orientation is performed according to the detected position. The clamps 20b and 20c are tightened again, and the intermediate workpiece W1 is held near its left end. The length of the intermediate workpiece | work W1 which protrudes to the left rather than the vise 20 is set to the length which does not bend during a joining operation.

Next, the main shaft 13b is driven by the rotating servomotor 13d, and the left workpiece W2 is rotated at a predetermined rotational speed. The shaft 16 is rotated in a predetermined direction by the slide servomotor 17, and the left unit 13 is moved toward the intermediate workpiece W1. When the rotating left workpiece W2 is brought into contact with the left end surface of the non-rotating intermediate workpiece W1, frictional heat is generated on the contact surfaces of both workpieces W1 and W2. The frictional heat softens the contact surfaces of both workpieces W1 and W2. After the softening proceeds to the desired state, the rotation of the left workpiece W2 is stopped. The stop position of the left workpiece W2 is controlled by the servomotor 13d, and the left workpiece W2 is stopped at a position in phase with the right workpiece W3 determined more than the main axis orientation. Simultaneously stop rotation and apply upset pressure between the workpieces W1 and W2. Then, the workpiece W2 is pressed into the intermediate workpiece W1, and both workpieces W1 and W2 are joined. Therefore, the left workpiece W2 and the right workpiece W3 can also be bonded to the long intermediate workpiece W1. In addition, the position of the left workpiece W2 and the right workpiece W3 in the rotational direction can be exactly matched and joined.

The workpiece bonding apparatus 10 of 1st Example has the following effects.

(1) By one workpiece bonding apparatus 10, joining to intermediate workpiece W1 of a wide range is possible.

(2) The induction motor 14d was adopted for the right side unit 14. Since the induction motor 14d is much cheaper than the servomotor 13d, it is possible to provide an inexpensive workpiece bonding apparatus compared to the conventional workpiece bonding apparatus having expensive servomotors in both units.

(3) The intermediate workpiece W1 is held in one vise 20. Therefore, since the configuration is simpler than the conventional workpiece bonding apparatus having the stationary vise and the movable vise for the intermediate workpiece W1, a cheap workpiece bonding apparatus can be provided.

(4) When joining the intermediate workpiece | work W1 and the right workpiece | work W3, since the left unit 13 plays the role of the stopper with respect to the intermediate workpiece | work W1, the intermediate workpiece | work W1 and the left workpiece | work When joining the pieces W2, the right unit 14 serves as a stopper for the intermediate workpiece W1. That is, in the workpiece bonding apparatus 10, the conventional fixed clamp is unnecessary. In addition, a dedicated stopper member for fixing the movement of the intermediate workpiece W1 is also unnecessary. Therefore, since the structure of a workpiece | work joining apparatus can be simplified, an inexpensive workpiece joining apparatus is provided.

(5) The stop position of the servomotor 13d for driving the left workpiece W2 is controlled in accordance with the rotational position of the right workpiece W3 joined to the intermediate workpiece W1. Therefore, the workpieces W1, W2, and W3 can be joined in a state where the phases of the left workpiece W2 and the right workpiece W3 exactly match.

The first embodiment may be modified as follows.

The vise, workpiece rotating mechanism, slide mechanism and phase control method are not the first embodiment. For example, the shafts 16 and 18 and the slide servomotors 17 and 19 may be changed to a hydraulic cylinder drive mechanism. The vise 20 may not slide. Also in this case, almost the same effects as in the first embodiment can be obtained.

The encoder which detects the rotation direction stop position of the right spindle 14b may be equipped in the right unit 14 which performs the joining process of a 1st step. The encoder detects the stop position of the right main shaft 14b at the end of the joining process in the first step, and based on the stop position, both workpieces W2, Phase matching between W3) is performed. In this case, almost the same effects as in the first embodiment can be obtained, and the main shaft orientation by the right unit 14 can be omitted.

The motor for driving the main shafts 13b and 14b may be a motor other than a servo motor and an induction motor. This also replaces one vise and one workpiece with a stopper. In particular, the motor of the right unit 14 may be changed to a low-cost motor such as a DC motor.

The right main shaft 14b is driven by the induction motor 14d via the pulleys P1 and P2 and the belt 14c, but may be changed to gears instead of the pulleys P1 and P2 and the belt 14c.

The induction motor 14d for driving the right main shaft 14b may be replaced with a servo motor. In this case, the effects of (1), (3) and (4) of the first embodiment are obtained.

Joining with the intermediate workpiece | work W1 may join the left workpiece | work W2 first, and then join the right workpiece | work W3 next.

The guide rails 12 may be a plurality of rails each provided for both the units 13 and 14 and the vise 20.

The guide rail 12 includes a guide member of another type such as a V-shaped groove.

While embodiments of the invention have been described in connection with the drawings, the invention is not limited to the above but may be modified within the scope of the appended claims and equivalents.

Claims (12)

delete delete delete delete delete delete delete delete delete In the workpiece joining method for joining the first, second, third workpieces by generating frictional heat between the first, second, third workpieces (W1, W2, W3), The third workpiece W1 is disposed between the first workpiece W2 and the second workpiece W3 and coaxially with the first and second workpieces. The step of maintaining the vicinity of one end by the single vise (20), Contacting one end face of the first work piece with another end face of the third work piece W1 so as to restrict movement of the third work piece W1 held in the single vise 20; A first joining step of joining the second workpiece to the third workpiece by pressing the one end surface of the third workpiece W1 while rotating the second workpiece W3; Sliding the single vise from near one end to the other end of the third workpiece, Maintaining the vicinity of the other end of the third workpiece W1 by the single vise; And a second joining step of joining the first workpiece to the third workpiece by pressing the other end face of the third workpiece while rotating the first workpiece W2. Joining method. delete The workpiece joining method according to claim 10, wherein the second joining step includes a step of controlling the rotation stop position of the first workpiece based on the rotation stop position of the second workpiece.