JPS6347575B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an assembly tool used for assembling a workpiece necessary for processing with the workpiece attached to a machine tool.

[Technical background of the invention and its problems]

In cutting workpieces, a plurality of workpieces may be combined and machined together. In such cases, conventionally, each workpiece that has undergone primary processing is removed from the machine tool, and then assembled by an operator using dowel pins, bolts, etc., and then reattached to the machine tool for matching processing. For this reason, operations such as removing and assembling the workpiece, and centering the workpiece after it has been installed on the machine tool are required, which increases the processing time and is a hindrance in attempting to automate the processing.

Therefore, in place of the spindle unit for cutting, a functional unit for assembly is removably attached to the saddle of the machine tool, allowing the machine tool to be used not only for cutting but also for assembling workpieces. Attempts have also been made to use it.

[Purpose of the invention]

The present invention has been made in consideration of these points, and provides an assembly tool that is attached to an assembly functional unit that is removably attached to a machine tool and that allows the machine tool to perform workpiece assembly work. The purpose is to provide

[Summary of the invention]

The assembly tool according to the present invention has a tool body in which a gripped part for attachment and detachment and a connection part to a tool drive device are provided at the rear part, and a parts storage passage hole attached to the front part of the tool body. An assembly parts storage container and an assembly parts engagement part at the tip and a tool drive at the rear end are arranged so that they can move forward and backward and rotate by inserting the parts storage passage hole of the assembly parts storage into the tool body. and a piston rod having a portion that engages the operating shaft of the device.

The assembly tool according to the present invention is replaced and attached to a tool drive device (for example, an assembly functional unit) using an ATC (automatic tool changer), and by moving the piston rod by the operating shaft of the tool drive device, the assembly tool can be replaced. Bolt tightening work can be performed by pushing the piston rod out of the parts storage passage hole toward the workpiece, and then rotating the piston rod using the operating shaft.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 11 is a tool body, and at the rear of the tool body 11 is a gripped part 12 formed with a V-groove that is gripped by the clamp arm of the ATC.
and a connection to the tool drive (assembly functional unit), for example a carbic coupling 13. Further, a pull stud 14 is formed at the rear end of the tool body 11 to be pulled and held by the clamp mechanism of the functional unit for assembly. A support arm 15 having an L-shaped cross section is fixed to the front part of the tool body 11, and an assembly parts storage 1 is installed between the support arm 15 and the front end surface of the tool body 11.
6 is retained. This assembly parts storage container 16
has a cylindrical shape and is rotatably attached to a support shaft 17 fixed at both ends to the support arm 15 and the tool body 11. Further, in the assembly parts storage container 16, a plurality of parts storage passage holes 18, which are passed through in parallel with the support shaft 17, are arranged in the circumferential direction on the same circumference at equal pitch intervals. The assembly parts storage container 16 is rotatably indexed by a so-called revolver system, and an air cylinder 19 attached to the lower front end of the tool body 11 indexes each pitch of the assembly parts storage container 16. A rotation is performed. That is, a rotating pin 21 is provided upright at a predetermined pitch on the end face of the assembly parts storage container 16, and a ratchet pawl 22, which is hooked and engaged with this pin 21, is attached to the air cylinder 19, and a spring 23
It is attached in a state where it is biased toward the pin 21 by. The air cylinder 19 is connected to the tool body 11
A piston 26 is fixed in a direction perpendicular to the support shaft 17 to support plates 24 and 25 suspended from both sides of the
The air cylinder 1
9 is slidable. A rib 29 for returning the air cylinder is provided between the support plate 25 and the air cylinder 19. Further, near the outer periphery of the assembly parts storage unit 16, pins 31 for stopping rotation are installed at predetermined pitches, so that if the force of the air cylinder 19 is too large and the assembly parts storage unit 16 rotates too much, , the rotation thereof is stopped by colliding with the air cylinder 19. In addition, the parts storage passage hole 18 of the assembly parts storage container 16
The positioning is performed by inserting the tip of the ball plunger 32 attached to the support arm 15 into a recess formed on the outer peripheral surface of the assembly parts storage 16. Note that reference numeral 33 is a lid for preventing the assembly parts stored in the assembly parts storage container 16 from falling, and reference numeral 34 is a set screw for fixing this lid 33 to the support arm 15.

A piston rod 35 is disposed within the tool body 11 so as to be movable forward and backward and rotatable by passing through a component storage passage hole 18 located at a specific position of the assembly component storage container 16. The front part of the piston rod 35 is supported by a bearing 36 provided within the tool body 11, and the rear part is supported within the tool body 11 via a sliding member 37 fitted to the piston rod 35. Further, an assembly component engaging portion 35a is formed at the tip of the piston rod 35, and an engaging portion 35b that engages with the tip of the operating shaft of the functional unit for assembly is formed at the rear end. These engaging portions 35a, 35b are convex portions and concave portions with a regular n-gonal cross section when the assembly part is a hexagonal socket head cap bolt, and when the assembly part is a dowel pin, a contact plane is formed to transmit an impact load. have. Reference numeral 38 is a ball plunger for preventing the piston rod 35 from falling.

A bracket 41 is fixed to the distal end surface of the support arm 15, and is provided with an assembly component outlet 39 whose axis coincides with the component storage passage hole 18 located at a specific position. A pair of centering pawls 42 are swingably attached to the bracket 41 while being biased by a spring 43 so as to close the outlet 39. This centering pawl 42 not only prevents the assembly parts from falling, but also serves to align the axis of the assembly parts with the axis of the outlet 39 when pushed out from the outlet 39. Synchronizing gears 44 that mesh with each other are attached to the rotating shafts 42a of the claws 42, respectively.

In the embodiment shown in FIG. 1, a hexagon socket head bolt B for tightening is housed as an assembly part, and a spring 45 for holding down the bolt B is arranged in the parts storage passage hole 18. This is to prevent bolt B from falling.

In order to perform automatic operation using the assembly tool 10 according to this embodiment, various switches are installed to detect the presence or absence of assembly parts and the position of the piston rod 35. That is, the presence or absence of assembly parts is determined by actuating the limit switch 51a with the stylus of the detection arm 51 inserted into the parts storage passage hole 18.
It is now being detected. Note that the presence or absence of assembly parts can also be detected by using a photoelectric sensor. Proximity switches 52 and 53 are provided at the front and rear parts of the tool body 11, and the proximity switch 52 controls the piston rod 35.
The stroke end of the piston rod 35 is detected, and the proximity switch 53 detects whether the piston rod 35 is inserted into the parts storage passage hole 18 of the assembly parts storage container 16 (it is determined that the piston rod 35 is not inserted). After confirming this, the indexing rotation of the assembly parts storage container 16 is performed). Furthermore, a proximity switch 54 is provided slightly behind the proximity switch 52 to detect malfunctions, such as when the tip engaging portion 35a of the piston rod 35 is not completely inserted deep into the hexagonal hole of the tightening bolt B. The system is designed to detect malfunctions.

Signals are exchanged between these switches and the functional unit for assembly, as shown in Figure 4.
This is done using an electrical signal connector 55 provided inside the teeth of the carboxylic coupling 13 on the rear end surface of the connector 1. Similarly, air is supplied from the assembly functional unit to the air port 56 bored in the front part of the tool body 11 and the air port 28 that supplies compressed air to the air cylinder 19. This is done using an air circuit connection connector 57 provided inside the teeth of the air circuit.

Next, the operation of this embodiment having such a configuration will be explained.

FIG. 5 is a sectional view showing an example in which the assembly tool 10 according to the present invention is attached to a tool drive device (assembly functional unit) 60. The assembly functional unit 60 is provided with an operating shaft 62 that is disposed in a functional unit main body 61 having a mounting opening 61a at its front end and is rotatably driven while moving forward and backward toward the mounting opening 61a. This operating shaft 62
is rotated by a drive motor 63 attached to the functional unit main body 61 via a gear mechanism 64, and is pushed forward by supplying compressed air from the air port K of the force applying air cylinder 72. It moves (bolt tightening) or is pushed forward by the air hammer 65 (knocking) and receives an impact load due to self-excited vibration of the air hammer 65. The tip 62a of the operating shaft 62 has a regular n-gon cross section, and the rear end engaging portion 35 of the piston rod 35 of the assembly tool 10
b. Mounting opening 61
A clamp mechanism 66 for tensioning and holding the pull stud 14 is provided near a. This clamp mechanism 66 is configured to tension and hold a clamp rod 68 provided with a clamp claw 67 by a spring 71 disposed within a cylinder 69. The assembly functional unit 60 is configured to be replaceably mounted on the saddle of a machine tool.

The required assembly tools are selected and replaced by ATC according to the assembly work required of the machine tool, such as bolt tightening, dowel pin driving, dowel pin pulling out, bolt removal, etc.

The selected assembly tool 10 holds the gripped part 12.
It is grasped by the clamp arm of the ATC and inserted into the mounting opening 61a of the functional unit 60 for assembly from the pull stud 14 portion. pull stud 1
4 is held under tension by a clamp mechanism 66, and the carbik coupling 13 meshes with the carbik coupler provided on the front end surface of the functional unit main body 61, so that the assembly tool 10 is assembled into the functional unit for assembly. 60. At the same time, the electrical signal connector 55 and the air circuit connection connector 57 are connected, and the functional unit 6 for assembly is connected.
An electric circuit and an air circuit are constructed between the

When performing bolt tightening work, first compressed air is supplied from the air port K of the applying air cylinder 72 provided at the rear of the functional unit main body 61, and the operating shaft 62 is moved forward. As a result, the tip 2a of the actuating shaft 62 engages with the rear end engaging portion 35b of the piston rod 35 of the assembly tool 10, moves the piston rod 35 forward, and removes the bolt B stored in the component storage passage hole 18. The tip engaging portion 35a of the piston rod 35 is fitted into the hexagonal hole. The bolt B is pushed out to the piston rod 35, but at this time, it is pushed out by pushing out the centering claws 42,
The axis of the bolt B is made to accurately match the axis of the screw hole provided in the workpiece. Two workpieces, such as a casing W1 and a cover W2, are overlapped and chucked by the other machine tool. Attach the tip of bolt B to workpiece W2
Motor 6 is pressed into the screw hole provided in
2, driving torque is transmitted to the operating shaft 62 via the gear mechanism 64, and the bolt B is rotated. Since the operating shaft 62 is pressed by compressed air supplied from the air port K, the bolt B is tightened.

When the bolt tightening work at one location is completed,
Next, bolt tightening work at other locations is performed.
For this operation, the assembly tool 10 is moved to a predetermined position together with the assembly functional unit 60. During this time, air port 56 and air port M
Then, compressed air is supplied from the air cylinder 19 to return the piston rod 35 and the operating shaft 62 to the rear.
, and push the pin 21 with the ratchet pawl 22 to rotate the assembly parts storage container 16 one pitch. Arrow N in FIG. 2 indicates the direction of rotation of the assembly parts storage container 16. As a result, the new component housing passage hole 18 in which the bolt B is housed is placed on the axial extension of the piston rod 35, and a new bolt tightening operation is performed in the same manner as described above. In addition, when the bolt tightening work is completed, compressed air is supplied from the air port 56,
Piston rod 35 is retracted.

The bolts thus stored in the component storage passage holes 18 are successively pushed out and screwed into predetermined locations, thereby performing bolt tightening work on the workpiece.

When driving a dowel pin, insert a hole into the parts storage passage hole 18 of the assembly parts storage container 16.
Insert and store the required notch pin and replace the notch assembly tool with the ATC, and install the actuating shaft 62.
After pushing the dowel pin out of the parts storage passage hole 18 by advancing the dowel pin, the air hammer 65 is operated and the dowel pin is driven in by the impact force generated by its self-excited vibration. In this case, the front end surface and the rearward surface of the piston rod 35 of the knock assembly tool are made flat.

Note that assembly parts (bolts, dowel pins, etc.) can be stored in the parts storage passage hole 18 using the setscrew 3.
4, remove the lid 33, and insert it into the component storage passage hole 18 from the side. In addition, in this embodiment, the assembly parts storage container is
It is said to be a so-called revolver system in which each pitch is rotated and indexed to supply new assembly parts one after another, but there are also other methods, such as stacking or stacking assembly parts in a fixed assembly parts storage. A method may also be adopted in which a large number of assembly parts are stored side by side and a spring disposed inside the assembly parts storage body pushes out the assembly parts one by one into the parts storage passage hole. This method is suitable for storing assembly parts such as parallel pins with few irregularities.

The assembly work using the assembly tool according to this embodiment is automatically controlled by signals from the detection switch provided on the assembly tool and the detection switch of the assembly functional unit.

〔Effect of the invention〕

As explained above, according to the present invention, the tool driving device (assembly functional unit) that is removably attached to the machine tool is automatically replaced and installed using ATC. It is possible to perform assembly work such as bolt tightening work and dowel pin driving work on workpieces. Further, since the assembly tool according to the present invention is equipped with an assembly parts storage container, it is possible to supply assembly parts and perform assembly operations independently without using a special parts supply device.

The assembly tool according to the present invention can be stored in a tool magazine together with ordinary cutting tools, and by selecting and using these as appropriate,
It is possible to use the same machine tool to perform not only the cutting process but also the assembly work necessary for the process. Therefore, the assembly tool according to the present invention can be used in a so-called complex production system in which by combining a plurality of machine tools, it is possible to not only cut a workpiece but also assemble the workpieces necessary for machining.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of an assembly tool according to the present invention;
Fig. 2 is a front view including the notch seen in the direction of the arrow in Fig. 1, Fig. 3 is a sectional view taken along the line of Fig. 1, Fig. 4 is a rear view as seen in the direction of the arrow in Fig. 1, and Fig. 5 is a FIG. 3 is a cross-sectional view showing the assembly tool according to the present invention in use. 10... Assembly tool, 11... Tool body, 12
... Grasped part, 13 ... Carbic coupling, 14 ... Pull stud, 16 ... Parts storage for assembly, 18 ... Parts storage passage hole, 19 ... Air cylinder, 35 ... Piston rod, 60 ... Functional unit for assembly, B... Bolts, W1, W2...
…work.

Claims (1)

[Claims] 1. A grasped part for attachment and detachment and a connection part to a tool driving device are provided at the rear end, and an assembly parts outlet and a center swingably attached to the front end face so as to block this outlet. a tool body having a protruding claw; an assembly parts storage unit having a parts storage passage hole attached to the front part of the tool body; a parts storage passage hole of the assembly parts storage unit in the tool body; a piston rod, which is inserted through the piston rod so as to be movable forward and backward and rotatable, and has an assembly component engaging portion at its tip and a component that engages with the operating shaft of the tool driving device at its rear end; Assembly tools with equipment. 2. The assembly parts storage device is a revolver-type parts storage device in which a plurality of component storage passage holes are arranged circumferentially through a rotatably mounted cylindrical body in parallel with the rotation axis. An assembly tool according to claim 1.