JPS6234495B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tapping machine, which is capable of forming a variety of tapped holes with one machine by mounting a large number of tapping heads on a turret, and which is capable of forming various tapped holes in a material plate. A tapping machine that allows smooth movement relative to the tapping head on a table, and eliminates vertical movement of the table itself, making it extremely easy to carry plate materials onto the table and to carry out plate materials from the table after processing. The aim is to provide a quick and efficient tapping process.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a plan view of a turret type tapping machine according to the present invention, in which 1 is a known material loading table having the same structure as that used in a turret punch press, 2 is a work holder thereof, and 3 is a tapping machine. The machine body, 4 is the NC device. table 1
A large number of balls 5 for receiving plate materials are provided on one side on the top, and the plate material W held by the work holder 2 moves on the table 1.

FIG. 2 is an explanatory diagram of the tapping machine main body 3, and the tapping machine main body 3 has a C-shaped frame 6.
A turret 8 mounted on the top of the turret 8 and carrying a plurality of tapping heads 7 thereon, a rotation drive device 9 for the turret 8, and a tapping head 7 that applies rotational force and downward pressure to the tapping heads 7 on the turret 8. The drive device 11 is constructed as follows.

That is, the turret 8 is bearing 13 about a vertical shaft 12 which is fixed in place on the upper frame 6, and in this embodiment is mounted on the turret 8.
It is equipped with 10 tapping heads 7. A large-diameter gear 14 is fitted into the base end of the turret 8, and the gear 14 and a servo motor 15 in the frame 6 are connected to the sprocket wheels 16, 17, the chain 18, and the sprocket wheel. 16
A small gear 19 fitted onto the shaft of the shaft is also interlocked and driven to rotate. 21 is an index spin device.

The tapping head 7 is installed through a hole drilled in the turret 8, and has a cylinder 23 which is slidable up and down within a collar 22 fitted in the hole, and a cylinder 23 which is rotatably inserted into the cylinder 23. It consists of a supported rotating shaft 24 and a known tapper 25 fitted to the lower end of the rotating shaft 24.

A compression spring 26 is interposed between the flange 23a at the upper end of the cylinder 23 and the collar 22, and the tapping head 7 is always urged upward.

Reference numeral 27 indicates a flange-like stopper formed at the lower end of the cylinder 23, and reference numeral 28 indicates a rotation stopper pin protruding into a vertical groove formed on the side surface of the cylinder 23.

A gear 29 is fixed to the upper end of the rotating shaft 24, and is adapted to mesh with a gear of a tapping head driving device 11, which will be described later, when the tapping head 7 is in a lowered position.

31a, 31b, and 31c are proximity switches for detecting the vertical position of the tapping head 7, and 32 is a lowermost position adjusting bolt.

FIG. 3 is an explanatory diagram of the driving device 11 of the tapping head.
and a cylinder device 36 that presses against the upper part of the tapping head 7 to push it down.

The tooth width of the gear 35 increases vertically, so that the gear 29 is always engaged when the tapping head 7 is in the lowered position below the uppermost position.

The cylinder device 36 consists of an air cylinder 37 and a rotating press plate 39 rotatably attached to the lower end of its piston rod 38, and the air cylinder 37 can expand and contract in two stages. .

41 is a tap attached to the tip of the tapper 25, and 42 is a bar for preventing rotation of the clutch in the tapper 25, which is locked to a bracket 43 hanging down from the turret 8.

44 is a plate material presser that is moved up and down by an air cylinder 45.

The turret type tapping machine of the present invention has, for example, the structure described above.

Next, its operation will be explained based on the above embodiment. To form a tapped hole in a plate material with a suitable pilot hole drilled by a punch press or the like, first, the tapping head 7 that fits the pilot hole drilled in the plate material W is rotated by rotating the servo motor 15. Turn the turret 8 and bring it to the front. Next, the turret 8 is fixed by the index spin device 21, the plate material W is held down by the plate material presser 44, and the air cylinder 37 is extended by one step. Then,
The rotating press plate 39 is connected to the gear 29 at the upper end of the rotating shaft 24.
Since it comes into contact with the upper surface and pushes down the tapping head 7 against the spring 26, the gear 29 meshes with the gear 35 for driving the tapping head. (FIG. 3 - Dot-dashed line) The above-mentioned engaged state is detected when the second-stage proximity switch 31b detects the flange portion 23a of the cylinder 23.

The uppermost position of the cylinder 23 is confirmed by the proximity switch 31a.

After the above-mentioned meshing state is detected and confirmed, when the motor 33 is driven, the rotating shaft 24 of the tapping head 7 rotates via the gear 35, and the tap 41 rotates.

Next, when the second stage of the air cylinder 37 is extended, the tapping head 7 is lowered with the gear 35 and the gear 29 meshing with each other, and the tap 41 cuts a predetermined thread in the prepared hole.

Due to the action of the tapper 25, even after the tapping head 7 reaches the lowest position (two-dot chain line in Figure 3), the tap 41 rotates and descends along the thread it has cut, until it reaches a predetermined lower position. Once the thread has been cut, the tap 41 begins to rotate in the opposite direction. At that point, the second air cylinder 37
When the step is contracted, the tapping head 7 rises, and the tap 41 continues to rotate in the opposite direction due to the action of the tapper 25, and is pulled out along the thread it has cut.

Detection of the start of the contraction operation of the air cylinder 37 is performed when the proximity switch 31C at the lowest stage
After detecting the flange portion 23a of No. 3, that is, after the tapping head 7 reaches the lowest position,
It is set after a predetermined time set by a timer (not shown).

The lowest position of the tapping head 7 is adjusted by the aforementioned bolt 32.

When the tap 41 is pulled out from the plate W as described above, releasing the plate presser 44 will cause the tap 41 to be pulled out from the plate W.
can be moved freely and the next pilot hole can be brought to the tapped position.If the motor 33 is stopped and the air cylinder 37 is brought to the most contracted state again, the gears 29,
35 disengages, the motor 15 is rotated to rotate the turret 8 and another tapping head 7
can be held in the tap position.

The operation will be more reliable if the protrusion on the turret 8 is detected by the proximity switch 46 and it is confirmed that the tapping head 7 is accurately held at the position of the drive device 11 described above.

The turret-type tapping machine according to the present invention can perform the tapping operation as described above with the above-mentioned configuration, for example, so if a tapping head having various types of taps is attached to the turret, it can be used to tap various types of screws on materials. Even when it is necessary to cut a thread, the desired thread can be cut quickly by simply rotating the turret and placing the appropriate tapping head in the tapping position, which is extremely efficient. In addition, since the plate material can be moved freely on the material loading table, various threads can be quickly cut at any position on the plate material.Moreover, the tapping head side descends to perform thread cutting operations on the plate material on the table. Since the table itself does not move up and down, it is very easy to carry the plate onto the table and take it out from the table, and from this point of view as well, the entire thread cutting operation can be carried out quickly and efficiently.
Furthermore, by simply pressing down with a push-down device consisting of a single fluid cylinder, two operations can be performed at once: turning on/off the drive to the tapping head (engaging/disengaging the gear) and descending thread cutting operation. Therefore, the structure and operation are simplified.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the turret type tapping machine of the present invention, Fig. 2 is a partially cutaway side view of the main body of the tapping machine, Fig. 3 is a longitudinal sectional side view of the main part, and Fig. 4 is a front view of the same. It is. DESCRIPTION OF SYMBOLS 1... Material loading table, 5... Board material receiving ball, 6... C-shaped frame, 7... Tapping head, 8... Turret, 9... Rotation drive device, 1
DESCRIPTION OF SYMBOLS 1... Tapping head drive device, 15... Servo motor, 23... Cylinder, 24... Rotating shaft, 25... Tapping device, 29... Gear, 33...
... Motor, 35 ... Gear with long tooth width, 36 ... Cylinder device (pushing device), 37 ... Air cylinder, 38 ... Piston rod, W ... Plate material.

Claims (1)

[Claims] 1. A material loading table with a plate receiving ball on one side and on which the plate can move freely, a C-shaped frame placed between the table at the top and bottom, and a rotating frame on the top of the C-shaped frame. a freely supported turret and a rotational drive device for the turret;
and a tapping head drive device provided at one location on the frame for a plurality of tapping heads mounted on the same circumference of the turret, each of the tapping heads having:
A cylinder supported vertically movably with respect to a turret, a rotating shaft rotatably supported within the cylinder, a drive transmission gear fitted to the upper end of the rotating shaft, and a gear for driving transmission fitted to the lower end of the rotating shaft. The driving device for the tapping head includes a pressing device for the tapping head, which is a fluid cylinder whose lower end of the rod comes into contact with the upper end of the rotating shaft, and a tapping device that engages the drive transmission gear in the lowered position. and a rotating drive device for the tapping head consisting of a gear with a long tooth width fitted on a matching drive motor shaft. A turret-type tapping machine characterized in that the drive motor is rotated to perform tapping after the drive transmission gear is engaged with a gear with a long tooth width on the rotary drive side of the tapping head by a pressing action. .