JPS6233013B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a punch press, and more particularly to a punch press equipped with a pierce nut processing device.

The so-called pierce nut processing is a process in which a member with a female thread in advance, that is, a nut, is press-fitted into a thin steel plate using a press machine, and a female thread is created in the plate material. This is a widely used processing method.

The pierce nuts used in pierce nut processing can be round, square or other shapes, but square nuts are generally used to prevent the nuts from rotating when the bolt is tightened.

Types of pierced nut processing include, for example, Figure 1 a.
As shown in Figure 1b, there are cases in which the pierce nut Q is attached to a plate material P such as a mild steel plate, and cases in which it is attached to an embossed place T on the plate material P to fix other parts R, as shown in Fig. 1b. .

When processing the above-mentioned pierced nuts, use a pierced nut suitable for the plate thickness, drive the pierced nut into the plate material, and fix the nut to the plate material by "caulking" it.

At this time, if you press more than necessary, the nut itself may deform too much and become unusable. Therefore, when driving the pierce nut into a plate using a press, etc., please be careful not to press it too hard due to changes in the thickness of the plate. It is necessary to apply appropriate pressure.

However, as a conventional pierce nut processing machine, a device that applies an appropriate pressing force in response to changes in the thickness of the plate material as described above has not yet been proposed.

This invention was devised in view of the above-mentioned conventional problems, and its purpose is to automatically adjust the stroke amount of the pressing device according to the thickness of the plate on which the pierced nut is processed, and apply pressure to the pierced nut. To provide a punch press in which pressing force is appropriately set.

Another object of the present invention is to provide a punch press which is equipped with a plurality of pressing devices and can be used selectively depending on the type of thread of the pierce nut, thereby improving processing efficiency.

Hereinafter, a preferred embodiment of the present invention will be described based on the accompanying drawings.

FIG. 2 shows a side view of a turret punch press 1 equipped with an NC device according to the present invention. workpiece W
A fixed table 7 that supports the workpiece W, and a workpiece positioning device 9 that positions the workpiece W.
and a disk-shaped upper turret 1 equipped with a punch 11.
3 and a disk-shaped lower turret 1 with a die 15
7, and a plurality of pressing devices 47a, 47b, to which the punch 11 is attached.
47c.

In particular, the gist of the present invention is that the turret punch press 1 is equipped with a pierce nut processing device 23.

The fixed table 7 is provided on a lower frame 25 located below the processing section 3 of the gate-shaped frame 5, and the workpiece positioning device 9 is connected to the second A movable table 29 is supported so as to be movable in the horizontal direction in the figure, and a supported carriage 33 is movably supported in the front and back directions of the paper in FIG. 2 via a rail 27 built on the movable table 29. and a work clamp 35 for clamping the workpiece W provided on the carriage 33, and can position the workpiece W in the front, rear, left and right directions with respect to the turret device 19.

As described above, the turret device 19 includes a disk-shaped upper turret 13 rotatably supported via a rotating shaft 39 on the upper frame 37 located above the processing section 3, and an upper frame 37 located above the processing section 3. The lower turret 17 is composed of a disk-shaped lower turret 17 that is rotatably supported by the lower frame 25 located on the lower frame 25 via a rotating shaft 41.
They are rotated in the same direction in synchronization with each other. A plurality of punches 11 are supported near the outer periphery of the upper turret 13, and a plurality of dies 15 corresponding to the plurality of punches 11 are supported on the lower turret 17.

The pierce nut processing device 23 is housed in a housing 43 attached to the frame 5, as shown in FIG.

The pierce nut processing device 23 includes a housing 43
A plurality of (three in this embodiment) pressing devices 47a, 47b, 47 are mounted on a support frame 45 provided therein.
c is attached, and the respective pressing devices 47a, 4
7b and 47c are mainly composed of a punch device 49, a fluid pressure cylinder 51, and a stroke adjustment device 53 that sets the vertical stroke of the fluid pressure cylinder 51.

Each punch device 49 has a punch holder 61 attached to the lower end of the piston rod 55 of the fluid pressure cylinder 51 via a mounting member 57 and a hardened backing plate 59, and further includes a punch holder 61.
A plate holding member 65 is attached to the lower part of 1 via a guide member 63.
is installed.

A punch 11 is housed inside a guide hole 67 formed in the center of the punch holder 61, guide member 63, and plate holding member 65 so as to be able to move up and down.

Further, a supply hole 69 for the pierce nut Q is formed in the side wall of the plate holding member 65 so as to be perpendicular to the guide hole 67.
A supply pipe 71a of the pierce nut Q supported by the rear guide member 71 of the earring nut Q is connected.

Note that the guide member 63 is connected to the punch holder 61.
Due to the plate holding spring (not shown) installed inside,
The plate holding member 65 and the supply pipe 71a move integrally because they are always pressed downward.

Further, the pierce nut Q supplied into the guide hole 67 of the plate holding member 65 is held by, for example, a magnet or a ball bushing, so as to remain stationary below the punch 11.

Next, each hydraulic cylinder 51 to which the punch device 49 is attached is attached to the frame 5 with a cylinder housing 73.
A piston 77 is connected to the piston rod 55 and partitioned into an expansion side pressure chamber 75b and a contraction side pressure chamber 75a, and is slidably housed inside the cylinder housing 73. Cylinder caps 79b and 79a, through which the rod 81 and the piston rod 79 pass, are fitted in an airtight manner to the upper and lower portions of the cylinder housing 73.

Rod 81 connected to the upper end of piston 77
is for adjusting the stroke of the piston 77.

Rod 81 on the cylinder cap 79a
The gear 85 has a stepped cam 83 on the top surface.
The cam 83 is provided with two sets of teeth 87a, 87b, 87c, and 87d having the same height in a stepwise manner so that four levels of height can be selected.

Also, a threaded portion 89 formed at the upper end of the rod 81
A nut 91 is screwed onto the set screw 91a.
The position of the nut 91 is then locked. In addition,
91b is a groove. A ring-shaped locking piece 93 is fixed to the lower surface of the nut 91 via a bolt, and a slit 95 is formed in a portion of the locking piece 93. Further, on the lower surface of the locking piece 93, a tooth portion 87 of the cam 83 formed on the upper surface of the gear 85 is provided.
Claw portion 97 that engages with a, 87b, 87c, and 87d
is formed.

The gear 85a fitted to the rod 81 connects to the drive gear 10 attached to the output shaft 101 of a rotary drive device 99 such as a motor via the gear 85b fitted to the rod 81b of the adjacent pressing device 47b.
It meshes with 3.

Further, the rod 81c of the pressing device 47c is also connected to the gears 85c, 85a, 85c fitted to this rod 81c.
5b, it meshes with a drive gear 103 attached to an output shaft 101 of the rotary drive device 99.

As shown in FIG. 6, the output shaft 101 of the rotary drive device 99 has detected objects 105a and 105 for detecting the rotation angle of the rotary drive device 99.
b, 105c are provided, and the detected object 1
Detectors 107a, 107b, 107c, such as proximity switches, are provided in portions of the frame 5 corresponding to 05a, 105b, 105c.

A stroke adjustment device 53 for adjusting the stroke of the piston 77 is provided on the side of the nut 91 screwed onto the rod 81.

As shown in FIG.
Detectors 109a, 109b, 109c such as proximity switches are provided to detect the position of the piston 77, and these detectors 109a, 109b, 109c are configured to detect three positions of the piston 77: upper limit, middle limit, and lower limit. ing.

Note that the pins 111 provided on the sides of the pressing devices 47a, 47b, and 47c are for regulating the rotation of the piston 77, and are fitted into the bushes 113. Further, this bush 113 is press-fitted into a bush holder 115, and the bush holder 115 is fixed to the cylinder housing 73.

Next, the die devices 117a, 117b, 117c installed below the punch device 49 in the pressing devices 47a, 47b, 47c, respectively, will be explained.

In the die devices 117a, 117b, and 117c, a hydraulic cylinder 119 for raising and lowering the die is attached to a cylinder block 119a, and a block 125 is fixed to the upper end of a piston rod 123 that is connected to a piston 121 of the hydraulic cylinder 119. There is.

A die holder 12 is mounted on the block 125 via a hardened plate 127 that supports the die 15.
9 is installed, and a die 15 is provided inside the die holder 129 so as to be movable up and down.

An ejector plate 131 is attached to the upper surface of the die holder 129 via a spring (not shown).

The block 125 has a punch insertion hole 133 formed in the center of the die 15 and the plate 127.
A slag discharge hole 135 is formed in communication with the cylinder block 119a, and a shutter 137 attached to the cylinder block 119a is formed at the bottom of the slag discharge hole 135.
is installed.

Note that 139 is a pin for regulating the rotation of the piston, 141 is a bush into which the pin 139 is fitted, and 143 is a bush holder.

Next, the pierce nut processing method of the present invention having the above-mentioned configuration will be explained.

First, the fluid pressure cylinder 119 is contracted to lower the unnecessary dies 15, and only the dies 15 that are to be used for piercing nuts are raised.

Next, in order to set the stroke of the punch 11 suitable for the thickness of the workpiece W, the rotary drive device 99 is driven, and the gear 85 which should have the required stroke
Rotate a, 85b, and 85c. The rotation angle of this rotary drive device 99 is
5b, 105c, and a detector 1 such as a proximity switch.
07a, 107b, and 107c to control and set the rotary drive device 99.

Gears 85a, 85b, which are required as described above,
When one of the gears 85c rotates, the gears 85a, 85
Teeth 8 of the cam 83 formed on the upper surface of b, 85c
One of 7a, 87b, 87c, and 87d faces a claw portion 97 of a locking piece 93 formed on the lower surface of the nut 91, and the stroke of the punch 11 during processing is set.

Also, a fluid pressure cylinder 51 that drives the punch 11
The stroke is at the upper limit before starting and after machining, but during continuous machining, it reciprocates between the bottom dead center and the center position.

In addition, since the unused dies among the plurality of dies corresponding to the punch are lowered to a height position where they do not interfere with the movement of the workpiece W, it is possible to have a plurality of pierce nut processing devices installed in parallel. Note that this does not interfere with the movement and positioning of the workpiece W.

In this way, the pierce nuts Q sequentially supplied onto the workpiece W are struck by the punch 11 to perform the pierce nut processing.

Also, when machining different sized pierce nuts Q at the same time or selectively machining them, set the stroke by rotating one or more of the gears 85a, 85b, 85c at the same time in the same way as above. , one or more pierce nuts Q are simultaneously machined on a workpiece W.

In the present invention, the turret punch press 1 is provided with the pierce nut processing device 23 equipped with pressing devices 47a, 47b, and 47c near the processing section of the turret device 19, so that the turret punch press 1 can press the workpiece. After embossing the W, pierce nut processing can be performed efficiently.

Further, the pressing devices 47a, 47b, 47c are provided with a
Automatically change the stroke amount of b and 47c,
In addition, since the stroke adjustment device 53 for setting an appropriate shaft height is provided, the pierce nut Q is not deformed or crushed during pierce nut processing, and can always be used as a good nut.

Furthermore, a plurality of pressing devices 47a, 47b, 47c
Since the pierce nut processing device 23 is provided in each of the pierce nuts Q, there is an effect that the pierce nuts Q of different sizes can be processed simultaneously or selectively.

Note that this invention is not limited to the above embodiments,
Other embodiments are also possible.

[Brief explanation of the drawing]

Figures 1a and 1b are explanatory diagrams showing the conventional pierce nut processing state, Figure 2 is a front view of a turret punch press embodying the present invention, and Figure 3 is a partially longitudinal front view of the pierce nut processing device. Figure 4 is a vertical sectional side view of Figure 3, Figure 5 is a plan view of Figure 3,
Figure 6 is a partially enlarged front view of the stroke adjustment device.
FIG. 7 is an explanatory diagram showing the rotation angle control section of the rotation drive device. Explanation of main symbols in the drawings, 19... Turret device, 3... Processing section, W... Workpiece, 1... Punch press, 23... Piercing nut processing device, 53
...Stroke adjustment device, 47a, 47b, 47
c...pressing device.

Claims (1)

[Claims] 1 In a punch press 1 that performs forming processing while moving a plate-shaped workpiece W back and forth and left and right to a processing section 3 provided in a turret device 19, a pressing device is provided near the processing section of the turret device 19. A plurality of sets of pierce nut processing devices 23 are provided in parallel, and the pierce nut processing device 23 is provided with an automatic stroke adjustment device that adjusts the punch stroke amount to an appropriate amount according to changes in the thickness of the workpiece W. A punch press characterized in that a fluid pressure device 119 is provided below each die 15 to lower unused dies 15 to a height position where they do not interfere with the movement of the work W.