JPH0353815Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a stopper mechanism for securing thrust by abutting a hollow member when friction welding a pipe-shaped workpiece, that is, a hollow member.

BACKGROUND TECHNOLOGY As is well known, friction welding is a joining method in which two metals are brought into contact and rotated relative to each other under pressure, and welded using the frictional heat generated at that time.One example is the welding of an automobile's rear axle housing. It is used in the production of In other words, the rear axle housing, which is called a Banjo type, has a bulge in the center where the differential gear is fitted, but generally the bulge 1 is the main body, as shown in Figure 3. It is manufactured by friction-welding a tube 3 whose one end is expanded to a base body 2. This is because the wheel leads are different for each car model, or even for the same car model, so tubes 3 of different lengths are used to accommodate various wheel leads.

When manufacturing the above-mentioned rear axle housing, as shown in FIG. 4, the tube 3 is inserted into a chuck unit 4 that is rotationally driven and gripped, and while the chuck unit 4 is rotated, the slide head 5 containing the chuck unit 4 is advanced. By doing so, the tube 3 is pressed against the base portion 2, which is the mating material. However, since the grasping by the chuck unit 4 is insufficient to obtain the thrust for joining, a stopper 6 is provided in the chuck unit 4, and the tube 3 is held in place by the chuck unit 4. It hits stopper 6. When such friction welding is automatically performed, the tube 3 is pressed against the fixed base body 2, so the amount of advancement of the tube 3 has a large effect on the joining accuracy and strength.
If the distance between the tube 3 and the tip of the tube 3 differs for each job, the control data must be changed according to the distance, resulting in a huge amount of control data and the need for a large and expensive control device. . In order to prevent such inconveniences, conventionally, the amount of protrusion (protrusion) l of the tube 3 from the chuck unit 4 is kept constant, so that machining is always performed using the same control data regardless of the length of the chuck unit 3. However, since the length of tube 4 is constant,
Assuming that the protrusion l is constant regardless of the total length of the tube 3, if the total length of the tube 3 is short, there will be a gap between the tube 3 and the stopper 6, and the stopper 6 will not function, making it difficult to generate sufficient thrust. will not be able to receive it. Therefore, in the past, there have been methods to change the stopper 6 itself according to the length of the tube 3 so that the protrusion l is constant, or to attach a dummy 7 of a length corresponding to the total length of the tube 3 to the tube 3 as shown in FIG. The method used was to attach it to the rear end of the car so that the actual overall length remained constant.

Problems to be Solved by the Invention However, since the tube 3 has a length of about 300 to 400 mm, the stopper 6 is inserted deep into the chuck unit 4. In the method of replacing the stopper 6, it is necessary to insert and remove the stopper 6 using an insertion tool and a withdrawal tool, which is not easy to operate and requires a lot of man-hours, and furthermore, the stopper 6 is quite heavy. , there was a problem in which they were forced to perform inefficient work.

Furthermore, with the method of using dummy 7, in addition to increasing the number of man-hours required for attaching and removing dummy 7, it is also necessary to return dummy 7 and secure a storage space.Furthermore, the burr cutting process is usually connected immediately after the friction welding process. Because of this, the location from which the dummy 7 can be removed is limited, and it is therefore necessary to prepare a large number of dummies 7 of the same type, resulting in a problem of increased equipment costs.

In view of the above-mentioned circumstances, the object of this invention is to provide a stopper mechanism whose length can be easily changed according to the length of the target hollow member.

Means for Solving the Problems In order to achieve the above object, this invention has a stopper that is inserted into the inside of the chuck unit and abuts against the hollow member, so that it corresponds to the longest hollow member among the target hollow members. It consists of a main stopper of different length, and a sub-stopper that can be attached to and removed from the tip of the main stopper depending on the length of the hollow member to be targeted, and the tip of the main stopper has a receiver against which the hollow member is abutted. The rear end of the sub-stopper is formed with an abutting part that matches the receiving surface, and the tip of the sub-stopper is provided with an abutting part that is aligned along the axis of the receiving surface against which the hollow member is abutted. A protruding operating rod is provided, and a guide surface is formed on the outer circumferential surface of the sub-stopper for alignment with the axis of the chuck unit.

Function: In this invention, the main stopper is inserted into the inside of the chuck unit, and when the longest hollow member of the target hollow members is to be friction welded, that hollow member is directly inserted into the inside of the chuck unit. When a short hollow member is friction welded, in addition to the main stopper, a sub-stopper corresponding to the length of the hollow member is inserted into the chuck unit. In that case, the sub-stopper can be pushed in using the operating rod protruding from its tip, and at the same time the axis of the sub-stopper is aligned with the axis of the chuck unit by the guide surface, making it easy to push the sub-stopper. can be set in the desired position. In addition, the abutment part of the rear end of the sub-stopper comes into contact with the receiving surface of the main stopper, so that it is integrated with the main stopper, and a receiving surface is formed at the tip of the sub-stopper in the same way as in the main stopper. Therefore, the length of the stopper as a whole becomes longer, and therefore, even with a short hollow member, the necessary protrusion can be secured. To change the length of the stopper in accordance with the length of the hollow member, grasp the existing sub-stopper by its operating rod and pull it out of the chuck unit, insert the new sub-stopper into the chuck unit, and make it contact the main stopper. Let them come into contact with you.

Embodiments Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 1 is a partially sectional front view showing a main stopper 10 and a sub-stopper 11 constituting the stopper mechanism of this invention. 3 and is composed of a main body part 13 having a key 12 formed at its rear end for applying rotational force, and a rotating part 14 provided at its tip. That is, at the tip of the main body part 13, a cylindrical member 15 is rotatably brought into surface contact with a lubricant such as grease interposed therebetween.
It is attached by a set screw 16 passing through the tube 3 along its center line, and a sleeve 17 having an inner diameter slightly larger than the outer diameter of the target tube 3 is attached to the outer periphery of the distal end of the cylindrical member 15. ing. Therefore, the rotary part 14 is configured such that the rear end of the tube 3 is inserted into and abutted against the inner peripheral side thereof, and the end surface of the cylindrical member 15 serves as the receiving surface 18. At the center of the tip of the set screw 16, as shown in FIGS. 1 and 2, there is a keyhole-shaped hole with an inner diameter larger at the inner depth than the opening diameter and a notch along the radial direction at the opening end. An engaging portion 19 is formed.

On the other hand, the sub-stopper 11 is for increasing the actual length of the entire stopper when the target tube 3 is short, and its rear end is formed to have a small diameter so as to fit inside the sleeve 17. The abutment part 20 is in contact with the receiving surface 18, and the outer diameter of the tip side is set to be the same as the outer diameter of the main stopper 10, and the outer peripheral surface of that part is used as a guide surface 21 for axis alignment. A receiving surface 22 similar to the receiving surface 18 is provided at the distal end, and an operating rod 23 is inserted and attached along the central axis. Therefore, in the above sub-stopper 11, the dimension from the rear end surface to the receiving surface 22 is the adjustment length L.
By creating multiple types of sub-stoppers 11 so that this adjustment length L is the same as the difference in length of the target tube 3, tubes 3 of various lengths can be accommodated. be able to. Further, the operating rod 23 protrudes toward the abutting portion 20, and at its protruding end there is a retaining pin 24 that is inserted into and engaged with the keyhole-shaped engaging portion 19.
is provided to protrude in the radial direction, and the length of the operating rod 23 on the distal end side is such that when the abutting portion 20 is in contact with the receiving surface 18 of the main stopper 10, the distal end is connected to the distal end of the chuck unit 4. It is set to a length that is located near the opening.

Next, the operation of the above stopper mechanism will be explained.

The main stopper 10 is inserted into the chuck unit 4, and when the longest tube 3 is to be friction welded, the tube 3 is inserted into the chuck unit 4 and abutted against the receiving surface 18 of the main stopper 10. When the tube 3 is set in this manner and gripped by the chuck unit 4, the actual length _L0 of the main stopper 10 is set to correspond to the length of the longest tube 3, so that
The tip of the tube 3 protrudes from the chuck unit 4 to ensure a certain protrusion l. Further, when performing friction welding of a short tube 3, the sub-stopper 11 is further inserted into the chuck unit 4. The sub-stopper 11 has an adjustment length L that is the same as the dimensional difference between the tube 3 to be processed and the longest tube 3, and is inserted into the chuck unit 4 by grasping its operating rod 23. In this case, the auxiliary stopper 11 is concentric with the chuck unit 4 due to its guide surface 21, so that simply pushing it in will cause its abutting portion 20 to abut against the receiving surface 18 of the main stopper 10. In that case, if the retaining pin 24 of the sub-stopper 11 does not match the keyhole-shaped engagement part 19 of the main stopper 10, the operating rod 2
3, rotate the secondary stopper 11 to insert the retaining pin 24 so that it aligns with the engaging part 19, and then further rotate the secondary stopper 11 to engage the retaining pin 24 to the engaging part 19. Match. In this state, the total length as a stopper is (L ₀ +L)
This makes the tube 3 longer than before, and this is to compensate for the lack of dimensions of the shorter tube 3. Therefore, the tip of the tube 3, whose rear end is in contact with the receiving surface 22 of the sub-stopper 11, protrudes from the chuck unit 4. As a result, a certain amount of protrusion L is secured. Therefore, by preparing a plurality of types of auxiliary stoppers 11 with different adjustment lengths L, the protrusion l
can be set to a certain size and set in the chuck unit 4.

Further, when friction welding a tube 3 having a different length from the previous one, the sub stopper 11 is replaced with an auxiliary stopper having an adjustment length L corresponding to the length. This operation involves rotating the operating rod 23 of the existing sub-stopper 11 to remove it from the engaging portion 19 and pulling it out from the chuck unit 4, and then inserting the new sub-stopper 11 into the inside of the chuck unit 4 in the same manner as described above. Insert into. Therefore, the above stopper mechanism can accommodate tubes 3 of various lengths simply by replacing the sub-stopper 11, and since the sub-stopper 11 has the operating rod 23 and the guide surface 21, its Replacement work is easy.

Incidentally, the friction welding of the tube 3 involves rotating the tube 3 together with the chuck unit 4 at a speed of over 1,000 revolutions per minute while pressing it against the mating material, and then abruptly stopping the rotation to temporarily increase the pressing force. However, if the tube 3 rotates somewhat due to inertia when the rotation is abruptly stopped, the rotating part 14 of the main stopper 10 will rotate together with the tube 3 and the main body part 13.
Since the tube 3 rotates relative to the main stopper 10 or the sub-stopper 11, seizure of the tube 3 to the main stopper 10 or the sub-stopper 11 is prevented.

Effects of the invention As explained above, according to the stopper mechanism of this invention, the stopper is composed of a main stopper and a sub-stopper, and among these, the small and lightweight sub-stopper that comes into contact with the main stopper allows the object to be stopped. The length is adjusted to suit the hollow member to be used, and since the sub-stopper is formed with an operating rod for insertion and removal and a guide surface for axis alignment, the sub-stopper can be easily and quickly replaced and extended. Therefore, the number of man-hours for changeover and the time required for it are significantly reduced compared to conventional methods, and the operating rate of the line is improved accordingly. Furthermore, since the sub-stoppers are easy to replace, it is sufficient to prepare one sub-stopper of each type, and as a result, equipment costs can be reduced.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing an embodiment of this invention, Fig. 2 is a view taken along the - arrow in Fig. 1, Fig. 3 is a schematic diagram for explaining the configuration of the rear axle housing, FIG. 4 is a schematic cross-sectional view of the chuck unit, and FIG. 5 is a front view showing a dummy for adjusting the length of the tube. 10...Main stopper, 11...Substopper, 18, 22...Receiving surface, 20...Abutting portion, 21...Guide surface, 23...Operation rod.

Claims (1)

[Claims for Utility Model Registration] A hollow member is inserted along the axis of a chuck unit that is rotationally driven and thrust is applied in the axial direction, and the tip of the hollow member is made to protrude by a predetermined distance to form a chuck unit. In the stopper mechanism of a friction welding machine for hollow members, which grips the hollow member and presses the hollow member against a mating member by friction welding, the stopper is inserted into the inside of the chuck unit and abuts against the hollow member. It consists of a main stopper with a length corresponding to the longest hollow member among the hollow members to be used, and a sub-stopper that can be attached to and removed from the tip of the main stopper depending on the length of the hollow member to be targeted. is formed with a receiving surface against which the hollow member abuts, and an abutment portion that matches the receiving surface is formed at the rear end of the sub-stopper, and the tip of the sub-stopper is formed with a receiving surface against which the hollow member abuts. A hollow device characterized in that it is provided with an abutment receiving surface and an operating rod protruding along the axis, and further has a guide surface formed on the outer circumferential surface of the sub-stopper for alignment with the axis of the chuck unit. Stopper mechanism in friction welding machine for parts.