JPH036864B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic press-fitting/welding device, and more specifically, for example, when a plurality of components are press-fitted and joined together, such as in an automobile propeller shaft, and then the respective joints are welded. , relates to an automatic press-fitting and welding device configured to automatically and continuously perform the press-fitting and welding processes.

Generally, in a product that is composed of a plurality of workpieces such as the propeller shaft, for example, two yokes and a shaft, each yoke is press-fitted on both sides of the shaft, and then the respective joints are welded to complete the engagement. The specified strength is ensured in the parts.

By the way, in the press-fitting process, the positioning of each yoke relative to the shaft must be performed accurately, and a large amount of force is required to press-fit the yoke and the shaft. Separate equipment and welding equipment are available. That is, after positioning and fixing the yoke and shaft in the press-fitting device and press-fitting the respective joints into each other, the workpiece is removed from the press-fitting device and transferred to the welding device, and after positioning again, phase alignment is performed, and then Press-fitting and welding work is completed by welding each joint while rotating the workpiece.

However, in the above-mentioned conventional technology, the press-fitting device and the welding device are configured separately, resulting in a large-sized device as a whole.Moreover, since the press-fitting and welding operations are performed in two steps, the operator has to remove the workpiece each time. It is necessary to transfer and attach the parts from the press-fitting equipment to the welding equipment to perform each operation, which makes the processing process complicated and takes time to complete the processing work, which is a disadvantage that it does not meet the demands of mass production in factories etc. was occurring.

Therefore, as a result of intensive research and efforts, the inventors of the present invention have developed a drive device that rotates the workpiece when welding it, a press-fitting device that presses the workpiece in the axial direction to press-fit the workpiece, and a drive device that rotates the workpiece during welding. A workpiece support device for holding the workpiece and a welding device for welding the joint portion of the workpiece are integrally combined, the drive device and the press-fitting device are arranged coaxially and facing each other, and the workpiece is supported by shafts attached to each. A workpiece positioning device is attached to the shaft,
On the other hand, if the workpiece support device and the welding device are configured to be displaceable with respect to the workpiece,
By simply mounting the workpiece on both shafts, the press-fitting process of the workpiece and the welding process of the respective joints can be carried out in succession. Therefore, the work process is simplified and the workpiece can be processed in a short time. It has been found that this method is particularly effective when processing workpieces in mass production, and that the device itself can be made smaller, making it cheaper to manufacture and reducing the area occupied by the device, eliminating the above-mentioned disadvantages. did.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an automatic press-fitting and welding apparatus that can automatically and continuously perform the press-fitting process and the welding process when press-fitting and welding a plurality of workpieces to obtain a product.

In order to achieve the above object, the present invention is an apparatus for coaxially disposing a first, second, and third workpiece, and press-fitting and welding the three workpieces while mutually rotating them, comprising: a first work holding means having a rotatable first shaft for holding one work; a second work holding means having a rotatable second shaft for holding the second work; a first positioning means that engages with an engaging part provided on the first work to position the first work; and a first positioning means that engages with an engaging part provided on the second work to position the second work. a second positioning means for pressing at least one of the first workpiece and the second workpiece in the axial direction thereof;
press-fitting means for press-fitting the first workpiece and the second workpiece into a third workpiece; supporting either the first workpiece, the second workpiece, or the third workpiece when the press-fitting means press-fits the workpiece; and after the press-fitting, the workpiece is a support means for retracting the first workpiece and the third workpiece, and a welding means for welding the joint between the first workpiece and the third workpiece and the third workpiece and the second workpiece; and rotating the first shaft or the second shaft. and rotating means for displacing the welding site of the first workpiece, the third workpiece, and the joint between the third workpiece and the second workpiece relative to the welding means.

Next, preferred embodiments of the automatic press-fitting and welding apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 10 indicates a frame, and a motor 12 is disposed inside the frame 10 on the left side. A rotating shaft extending from the motor 12 is connected to a reducer 14. A sprocket 16 is attached to the rotating shaft extending from the reducing gear 14, and a chain is suspended from the sprocket 16 as described later. Here, a base 18 is fixedly held on the upper part of the pedestal 10.

A drive device 20 is disposed on the left side of the base 18, that is, above the motor 12, while a press-fitting device 22 is disposed on the right side of the base 18, facing the drive device 20 and coaxially therewith. will be placed. Furthermore, a first support device 24 and a second support device 26 are provided approximately in the center of the base 18,
On the other hand, a third support device 30 and a welding device 32 are attached to the support column 28 whose one end is fixed to the side of the base 18. Here, the first support device 24 and the second
The support device 26 and the third support device 30 constitute a workpiece support device 34 .

Therefore, the device of the present invention basically includes the drive device 20.
, a press-fit device 22 , a work support device 34 , and a welding device 32 . Next, each device will be explained in detail.

First, the support member 3 constituting the drive device 20
A first shaft 38 is rotatably mounted on the shaft 6 in the axial direction thereof. A sprocket 40 is attached to one end of the first shaft 38, and a chain 42 is stretched between the sprocket 40 and the sprocket 16. By the way, the first shaft 38 is composed of a first rod 44, a second rod 46, and a flange 48 integrally formed between the respective rods 44, 46.
A conical center pin 50 is provided at the tip of 6. A grounding ring 52 is attached to the second rod 46 to provide grounding for the safety of the device.

On the other hand, in the support member 36, guide bars 54a and 54b are mounted via bearings so as to sandwich the shaft 38, and one end of each is attached to the plate 56.
Springs 58a and 58b are interposed between the plate body 56 and the support member 36. moreover,
The plate body 56 has cylinders 60a, 6 in the vertical direction.
0b, and cylinder rods 62a, 62b extend from the respective cylinders 60a, 60b.

The above is the basic configuration of the drive device 20, and next, the press-fitting device 22 will be explained.

As shown in FIG. 3, a support member 64 constituting the press-fitting device 22 has a cylinder 6 for press-fitting the workpiece.
6 is provided, and a piston member 68 is housed in the cylinder 66. The piston member 68 is provided with a first cylindrical portion 70 and a second cylindrical portion 72 , and a connecting plate 74 is in contact with one end surface of the first cylindrical portion 70 .
A sleeve 78 having a flange 76 formed at one end thereof for holding the piston is fitted into the first cylindrical portion 70, and a piston head 80 is attached to the other end surface of the sleeve 78. On the other hand, the second cylindrical portion 72
is provided with a center hole holding cylinder 82,
A piston member 84 is housed therein. Here, a second shaft 86 is mounted coaxially with the first shaft 38.

The second shaft 86 includes a rod 90 and a rod 92 having a center pin 88 at the tip thereof, a rod 94 having a smaller diameter, and a flange 96 integrally formed between the rods 90 and 92. . The flange 96 is rotatably abutted on a bearing 98 held between the flange 76 and the piston head 80. Furthermore, the rod 92
is rotatably fitted into the sleeve 78 via a bearing, and the rod 94 is connected to the piston member 84.
Insert into.

By the way, a guide plate 100 is fixed to the cylinder 82, and guide bars 104a and 104b are fitted to the guide plate 100 with springs 102a and 102b interposed therebetween. The guide bars 104a, 104b are fitted into the support member 64 via bearings, and one end of each is fixed to the face plate 106. Cylinders 108a and 108b are arranged on the face plate 106 to face each other in the vertical direction.
From 08b onwards, cylinder rods 110a and 11 are installed, respectively.
0b extends toward the center inward.

The basic structure of the press-fitting device 22 has been described above, and next, the workpiece supporting device 34 will be explained.

As shown in FIG. 2, connection bars 114a and 114b are fixed to both lower ends of the connection plate 74 via connection pins 112a and 112b, and the connection bars 114a and 114b engage with the first support device 24. . That is, slide blocks 116a and 116b are provided on both sides of the holding member 115 constituting the first support device 24, and the connection bars 114a and 114b are connected to the slide block 11.
6a, 116b, and a locking portion 117a, at the tip of each connecting bar 114a, 114b.
117b, and each connecting bar 114
Pressing portions 118a, 11 are provided approximately at the center of portions a, 114b.
Form 8b. On the other hand, the slide block 116
a and 116b are movably mounted on rails 120a and 120b fixed to the base 18.

By the way, in FIG. 4a, the holding member 1
A cylinder 122 is disposed within the cylinder 15, and a cylinder rod 124 extends from the cylinder 122.
A workpiece holder 128 having a substantially V-shaped step 126 is fixed to the tip of the workpiece holder 128 . Here, guide bars 130a and 130b are fitted into the holding member 115 so as to be freely displaceable in the vertical direction, and are fixed through the workpiece holding table 128, with hemispherical tip portions 132a and 132b formed at their respective tips. Ru.

Furthermore, protective covers 134a and 134b whose lower ends are rotatably held on both sides of the holding member 115 are attached via springs 136a and 136b.
a and 134b are formed so as to form a semi-cylindrical shape when their respective upper ends are brought into contact with each other. Note that the protective covers 134a and 134b are connected to the spring 136.
a, 136b, the guide bar 130
Tips 132a, 132b of a, 130b, respectively
When the work holding table 128 is lowered by the operation of the cylinder 122, the upper ends of the protective covers 134a and 134b come into contact with each other (see FIG. 4b).

Incidentally, a clamp cylinder 137 is attached to the slide block 116b, and a cylinder rod of the clamp cylinder 137 is connected to a multi-jointed clamp arm 138. The tip of the clamp arm 138 is disposed above the workpiece holding table 128. Further, a workpiece pedestal 140 is implanted in the holding member 115 (see FIG. 2).

Here, the second support device 26 will be explained.
As shown in FIGS. 1 and 2, a cylinder 144 is provided inside a holding member 142 constituting the second support device 26, and a cylinder rod 146 extending from the cylinder 144 has a distal end portion that holds the workpiece. A V-shaped step 1 corresponds to the stand 128.
A work holder 150 having 48 is fixed.
Furthermore, a guide bar 152 is attached to the holding member 142.
The guide bars 152a and 152b penetrate the workpiece holding table 150 and are fixed thereto, forming hemispherical tip portions 154a and 154b at their respective tip portions. . The holding member 142 also has protective covers 15 formed in a bent shape on both sides thereof, similar to the holding member 115.
6a, 156b are supported by springs (not shown) and are brought into contact with the tip portions 154a, 154b.

On the other hand, the holding member 142 is provided with a clamp cylinder 158, and the clamp cylinder 15
One end of a multi-joint clamp arm 160 is connected to the cylinder rod 8. The tip of the clamp arm 160 is connected to the workpiece holding table 1.
It extends vertically above 50. Further, a workpiece pedestal 162 is arranged near the holding member 142.

By the way, a mounting base 1 is attached to the upper end of the support column 28.
64 is fixed at an angle, and the mounting base 164 has a third
A support device 30 is attached. That is, a roller clamp cylinder 166 is fixed to the mounting base 164, and clamp rollers 172a and 172b are rotatably provided at the tip of a cylinder rod 168 extending from the mounting base via a mounting member 170.

The above is the basic structure of the workpiece support device 34, which is composed of the first support device 24, the second support device 26, and the third support device 30.Next, welding for welding the respective joints after press-fitting the workpiece Device 3
2 will be explained.

Guide rails 174a and 174b are fixed to both sides of the mount 164 fixed to the support column 28, and a cylinder 176 is disposed above the mount 164. A slide plate 180 is fixed to the tip of the cylinder rod 178 extending from the cylinder 176, the slide plate 180 engages with the guide rails 174a and 174b, and welding torches 182a and 182b are provided on both sides of the slide plate 180, respectively. will be placed.

The automatic press-fitting and welding apparatus according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

First, the first shaft 3 attached to the drive device 20
The work W is supported by the center pin 50 of No. 8 and the center pin 88 of the second shaft 86 attached to the press-fitting device 22. That is, with one end of the workpiece W engaged with the center pin 50, the cylinder 66 is operated to move the second shaft 86 in the direction of the arrow A.
direction by a predetermined amount, and the center pin 88 is engaged with the other end of the workpiece W. In this case, the workpiece W is a propeller shaft composed of a first yoke workpiece W ₁ , a shaft workpiece W ₂ and a second yoke workpiece W ₃ ,
Through holes 184a and 18 are provided in work W ₁ and work W ₃ .
4b is bored perpendicularly to the axis of the workpiece W.

Here, by driving the cylinders 60a and 60b, the respective cylinder rods 62a and 62b are inserted into the holes 1.
84a, while the cylinders 108a, 10
The holes 184a and 184b are positioned by driving the cylinder rods 8b and fitting the cylinder rods 110a and 110b extending therefrom into the holes 184b.

By the way, the work W is supported by the work support device 34.
Positioned by That is, cylinder 12
When the cylinder rods 2 and 144 are driven, the cylinder rods 124, 146 extending from the respective cylinder rods 124, 146 are raised, and therefore the work holding tables 128, 150 are also raised. Therefore, if the workpiece holding tables 128 and 150 are stopped at predetermined positions, the respective V-shaped stepped portions 12
6,148 comes into contact with the workpiece W and holds it. In this case, the tips 132a, 132b and 154a, 154b are each covered by a protective cover 164.
a, 134b and 156a, 156b to open them.

Further, when the clamp cylinders 137 and 158 are driven, the clamp arms 138 and 160 press and hold the upper surface of the workpiece W, and on the other hand, when the clamp cylinder 166 is driven, the clamp rollers 172a and 172b are pressed against the upper surface of the workpiece W. bring it into contact with.

In this way, the cylinder 66 provided in the press-fitting device 22 positions and holds the workpiece W.
When driven, the piston member 68 is pressed leftward (in the direction of arrow A) at the position shown in FIG. 2, so the second shaft 86 presses the workpiece _W3 leftward. Therefore, a pressing force acts on the joints of the works W ₁ and W ₂ and the joints of the works W ₂ and W ₃ so that they are press-fitted.

In this case, the cylinder rods 62a, 62b
The guide bars 54a and 54b are fitted into the holes 184a to position them, and the guide bars 54a and 54b are connected to the springs 58.
Since the cylinder rods 62a and 62 are displaceably attached to the support member 36 via the cylinder rods 62a and 58b,
b is capable of positioning the workpiece _W1 without being affected by the pressing force of the second shaft 86. On the other hand, in the workpiece _W3 , cylinder rods 110a and 110b are also installed in the hole 184b.
The guide bars 104a, 104b are inserted into the springs 102a, 102b to position them.
Since it is displaceably fitted to the guide plate 100 via the guide plate 100, the workpiece _W3 can be positioned without being affected by the pressing force of the second shaft 86. Therefore, when the press-fitting device 22 press-fits the joint portions of the works W ₁ , W ₂ , and W ₃ , the positions of the respective holes 184 a and 184 b can be extremely easily positioned. Also,
Locking portions 117a, 117b provided at the tips of the connecting bars 114a, 114b and a pressing portion 118a,
118b for a predetermined period of time,
It becomes possible to cope with the contraction of the workpiece W in the axial direction during the press-fitting operation.

After completing the press-fitting work of the workpiece W in this manner, the driving of the cylinder 66 is stopped, and on the other hand,
Cylinders 60a, 60b and 108a, 108
b to move the cylinder rods 62a, 62b and 110a, 110b into the holes 184a, 184.
Separate from b. Furthermore, the cylinder 122,1
By driving 44, the cylinder rod 12
4,146 to the workpiece holding table 128 and 1
Lower 50. In this case, the protective cover 134
a and 134b descend while contacting the tips 132a and 132b due to the tensile force of springs 136a and 136b, and therefore, contact the upper ends of each and store the work holding table 128 therein (fourth (see figure b). Further, since the workpiece holding table 150 is similarly housed in the protective covers 156a and 156b, molten metal may adhere to or damage the workpiece holding table 128 and 150 during the welding process described later. Work holding stand 12
8,150 to prevent inconveniences that would reduce the positioning accuracy.

Here, the clamp cylinders 137, 158 are driven to move the clamp arms 138, 160 to the workpiece W.
and the roller clamp cylinder 1.
66 is driven to separate the clamp rollers 172a and 172b attached to the tip portions from the workpiece W. Therefore, when the center hole holding cylinder 82 provided in the press-fitting device 22 is driven, the second
Since the shaft 86 moves to the left and slightly presses the workpiece W ₃ , the workpiece W is held with its both ends in contact with only the center pins 50 and 88 .

In the workpiece W held in this way,
Welding is performed by rotating the joint between the works W ₁ and W ₂ and the joint between the works W ₂ and W ₃ that constitute this.

That is, when the cylinder 176 is driven to lower the cylinder rod 178 extending from the cylinder rod 178, the slide plate 18 fixed to the tip end of the cylinder rod 178 is lowered.
0 also falls. Therefore, the slide plate 1
Welding torches 182a, 1 attached to both ends of 80
The tips 82b are positioned at positions close to the joints of the work W. here,
When the motor 12 is driven, a rotating shaft extending from the motor 12 rotates, and the rotation is reduced to a predetermined rotational speed by the reducer 14. A sprocket 16 is attached to the rotating shaft of the reduction gear 14, and when the sprocket 16 rotates, the sprocket 40 also rotates via the chain 42. Furthermore, the rotation of the sprocket 40 is controlled by the rod 44 and the flange 48.
is transmitted to the center pin 50 provided at the tip of the rod 46. In this manner, when the first shaft 38 rotates, the work W held at one end thereof also rotates. Therefore, the welding torches 182a and 182b are used to
It becomes possible to continuously weld the periphery of each joint.

After press-fitting and welding the workpiece W as described above, the cylinders 122 and 144 are driven to raise the workpiece holding tables 128 and 150, and the workpiece W is brought into contact with the V-shaped stepped portions 126 and 148, respectively. let In this state, if the cylinder 66 of the press-fitting device 22 is driven to move the piston member 68 to the right (in the direction of arrow B), the center pin 88 will be separated from the workpiece W. Further, when the cylinder 66 is driven to move the piston member 68 to the right, the face plate 106 is displaced to the right via the guide bars 104a, 104b, and the locks formed at the tips of the connecting bars 114a, 114b The parts 117a and 117b are the slide block 11
6a, 116b and move them to the right. Therefore, the workpiece holding table 128 also moves to the right, and the workpiece W also moves with it, so that the workpiece W is separated from the center pin 50 and held on the workpiece holding tables 128 and 150.

Therefore, the drive of the cylinder 66 is stopped,
When the workpiece holding tables 128 and 150 are lowered again, the workpiece W is also lowered and the workpiece holder 14 is lowered.
0,162 and is supported by these. Here, the workpiece W is removed from the workpiece pedestals 140, 162, a new workpiece is placed, and the press-fitting and welding operations are performed according to the steps described above.

As described above, according to the present invention, there are two methods: press-fitting and welding.
For workpieces that require a process, once the workpiece is placed in the device, the press-fitting work and welding work can be automatically performed all at once and continuously, which greatly simplifies the work and saves time. Both tasks can be completed, making it an extremely effective means for forming workpieces in mass production processes. Moreover, since the press-fitting device and the welding device are attached to one device, the entire machine can be downsized, and the manufacturing cost can be kept low.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design can be made without departing from the gist of the present invention. Of course.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an automatic press-fitting/welding device according to the present invention, FIG. 2 is a partially sectional front view of the device, and FIG.
The figure is a partially omitted cross-sectional view of the press-fitting device installed in the device, Fig. 4a is a partially omitted cross-sectional view taken along the - line in Fig. 2 when the workpiece holding table is raised, and Fig.4b is the workpiece holding table. FIG. 2 is a partially omitted sectional view taken along the line - in FIG. 2 when it is lowered; 10... Frame, 14... Reducer, 18... Base, 20... Drive device, 22... Press-fitting device, 2
4, 26...Support device, 28...Strut, 30...
Support device, 32... Welding device, 34... Work support device, 36... Support member, 38... Shaft,
50... Center pin, 54a, 54b... Guide bar, 56... Plate, 64... Support member, 66
...Cylinder, 68...Piston member, 70,7
2... Cylindrical part, 74... Connection plate, 84...
Piston member, 86... Shaft, 88... Center pin, 100... Guide plate, 104
a, 104b...guide bar, 106...face plate,
114a, 114b... Connection bar, 115... Holding member, 116a, 116b... Slide block, 120a, 120b... Rail, 122...
Cylinder, 128... Work holding stand, 130a,
130b...Guide bar, 134a, 134b...
...Protective cover, 140... Work holder, 142...
...Holding member, 144... Cylinder, 150... Work holding stand, 152a, 152b... Guide bar, 156a, 156b... Protective cover, 162
...Work holder, 164...Mounting stand, 172a,
172b... Clamp roller, 174a, 174
b... Guide rail, 180... Slide plate, 182a, 182b... Welding torch, W...
work.

Claims (1)

[Scope of Claims] 1. An apparatus for press-fitting welding by coaxially disposing a first, second, and third workpiece while mutually rotating the three workpieces, the device holding the first workpiece. a first work holding means having a rotatable first shaft for holding the second work; a second work holding means having a rotatable second shaft for holding the second work; a first positioning means for positioning the first work by engaging with an engaging part provided on the second work; and a second positioning means for positioning the second work by engaging with an engaging part provided on the second work. means, by pressing at least one of the first workpiece and the second workpiece in the axial direction thereof,
press-fitting means for press-fitting the first workpiece and the second workpiece into a third workpiece; supporting either the first workpiece, the second workpiece, or the third workpiece when the press-fitting means press-fits the workpiece; and after the press-fitting, the workpiece is a support means for retracting the first workpiece and the third workpiece, and a welding means for welding the joint between the first workpiece and the third workpiece and the third workpiece and the second workpiece; and rotating the first shaft or the second shaft. an automatic press-fitting/welding device comprising: a rotating means for displacing the welding site of the first workpiece, the third workpiece, and the joint between the third workpiece and the second workpiece relative to the welding means; . 2. The apparatus according to claim 1, wherein the press-fitting means includes a cylinder for displacing a center pin that engages at least one end of the first and second workpieces, and the cylinders are coaxially arranged. It has a first piston member and a second piston member, and the first and second workpieces are press-fitted into the third workpiece under the biasing action of the first piston member, and the second piston member is held. Automatic press-fitting and welding equipment in which all workpieces are rotated and welded under the action.