JPH03189098A - Press device - Google Patents

Abstract

PURPOSE:To rapidly and accurately detect the positions of pressurizing punches by detecting the positions of the punches by means of optical position detecting sensors. CONSTITUTION:Light rays are emitted from the optical position detecting sensors 22, 24, 26 toward the punches 8, 10, 12 in the cam type press device 1 for forming powder moldings and the light rays reflected by the punches are again received by the optical position detecting sensor 22, 24, 26. The positions of the punches are easily detected in this way. The easy detection of the positions of the punches with high accuracy is, therefore, possible and the easy adjusting and setting of the positions of the punches while observing the information outputted from the optical position detecting sensors are possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a press device having a function of detecting the position of a punch.

(Prior Art) In a press device, in order to obtain a highly accurate product through press processing, it is necessary to raise and lower an upper punch and a lower punch with high accuracy. For example, in a press machine that molds a powder molded product, the position of the punch during powder filling and powder pressing affects the dimensions and shape of the molded product and the compaction density. For this reason, some press devices are equipped with a mechanism for setting the upper limit position of the punch and the lower limit position of the punch.

For example, in a press device used for molding powder compacts, a nut is screwed onto a punch or a punch holder to finely adjust the position of a pair of punches with an interval above and below. An arm oscillated by a cam is engaged between the nuts, and when the punch rises, the arm engages the upper nut and raises the punch, and when it descends, the lower nut engages with a stopper provided on the device body. There is a type that determines the lowering position by collision.

However, with this type of press equipment, vibrations when the punch moves up and down can loosen the tightening of the nut and change the position of the nut, and the parts to which the punch is attached must be disassembled and reassembled to replace the punch. Sometimes the nut's position changes. When the position of the nut changes in this way, the position of the punch also changes accordingly.

For this reason, this cam type press device is provided with a mechanism for detecting the position of the punch. In a conventional cam type press device, the following configuration is employed as a mechanism for detecting the position of a punch.

One of them is to provide a pointer on the punch holder and a scale body on the main body of the device, and read the position of the punch by pointing the pointer to the scale body.

Another method is to align the molding surface of the punch with the die plate surface as a reference, and roughly adjust the position based on the thread pitch of the positioning nut screwed onto the punch and the rotation speed or rotation angle of the nut. Then, the punch position is determined by actually performing press working and correcting the nut position while measuring the dimensions of the workpiece.

(Problem to be Solved by the Invention) However, due to the length of these punch position detection mechanisms, in the former case, the accuracy of position detection of the punch is poor, and in the latter case, adjustment of the positioning nut is troublesome. There is a problem in that disassembling and assembling the mold in conjunction with the position adjustment work and the disassembly and cleaning of the punch requires time and effort.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a press device that can quickly and accurately detect the punch position.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the press device of the present invention is characterized in that it is equipped with a function of detecting the position of a punch using an optical position detection sensor. It is.

In this press apparatus, it is preferable that the punch side is provided with a mechanism for setting the upper limit position of the rise and the lower limit position of the press, respectively.

(Function) That is, the position of the punch can be easily detected by emitting light from the optical position detection sensor toward the punch and receiving the light reflected by the punch again by the optical position detection sensor. Therefore, the position of the punch can be detected easily and with high precision, and the position of the punch can be easily adjusted and set while viewing the information output from the optical position detection sensor.

Moreover, the position can be detected at the same time even when the punch is moving.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the press device of the present invention,
This embodiment is directed to a cam-type press device for molding powder compacts. The configuration of this cam type press device will be explained.

In the figure, reference numeral 1 denotes the main body of the apparatus, and in this main body 1, from the top, there are an upper punch holding part 2, a die table 3, an outer lower punch holding part 4.5, and an inner lower punch holding part 6, which are vertically spaced from each other. It is installed horizontally in the position.

An upper punch holder 7 is inserted and held in the upper punch holder 2 so as to be vertically movable, and an upper punch 8 is attached to the lower end thereof. A cylindrical lower outer punch holder 9 is inserted and held in the lower outer punch holding portion 4.5 so as to be vertically movable, and a lower outer punch 10 is attached to the upper end thereof. The outer lower punch 10 is inserted into a die portion formed on the die table 3 so as to be vertically movable. An inch lower punch holder 11 is inserted and held in the inner lower punch holder 9 and the inner lower punch holding portion 6 so as to be vertically movable, and an inner upper bunch 12 is attached to the upper end thereof. The inner upper bunch 12 is inserted into the inner upper punch 10 so as to be vertically movable.

These are the upper punch holder 7 and the outer lower punch holder 9.
The inch punch holder 11 is provided with a threaded portion, respectively. An upper punch lifting nut 13 and an upper punch pressing nut 14 are screwed into the threaded portion of the upper punch holder 7 with an interval in the vertical direction. An outer compression adjusting nut 15 and an outer filling adjusting nut 16 are screwed into the threaded portion of the outer lower punch holder 9 with a vertical interval between the outer lower punch holding part 4 and the outer lower punch holding part 5. ing. Furthermore, an inner compression adjustment nut 17 and an inner filling adjustment nut 18 are screwed into the threaded portion of the inner/outer lower punch holder 11 with a space between them vertically between the outer lower punch holding part 5 and the inch lower punch holding part 6. are combined.

Between the upper punch lifting nut 13 screwed onto the threaded portion of the upper bunch holder 7 and the upper punch pressure nut 14, the outer compression adjustment nut 1 screwed onto the threaded portion of the outer lower punch holder 9.
5 and the back filling adjustment nut 16, and further screwed into the threaded part of the inner lower punch holder 11.
Pressure arms 19, 20, 21 are inserted between the inner filling adjusting nut 18 and the inner filling adjusting nut 18, respectively. Each of these pressing arms 19 to 20 is rotatably supported by a pin (not shown), and is operated by the rotation of a rotary cam (not shown) to each punch holder 7 via each nut 13, 14, 15, 16, 17, 18. .9.11 is moved up and down at a predetermined timing and distance. As a result, the upper bunch 8, the outer lower punch 10, and the inner lower punch 11 move up and down, respectively.

Here, the upper punch lifting nut 13 engages the pressure arm 19 when the upper punch 7 is raised, and the upper punch pressure nut 14 engages the pressure arm 19 when the upper bunch 8 is lowered for press working. It is something that engages with. The outer compression adjustment nut 15 engages with the pressure arm 20 when the lower outer punch 10 is raised for press working, and the outer filling adjustment nut 16 engages with the pressure arm 20 when the lower outer punch 10 is lowered. At the same time, the punch collides with the upper surface of the outer lower punch holder 5. The inner compression adjustment nut 17 engages with the pressure arm 21 when the inner lower punch 12 is raised to perform press working, and the inch filling adjustment nut 18 engages with the pressure arm 21 when the outer lower punch 10 is lowered. At the same time, it collides with the upper surface of the upper punch 6.

The upper punch holder 2 provided in the apparatus main body 1 is provided with an upper punch laser displacement sensor 22, and the upper punch holder 7
A reflecting plate 23 is mounted below the laser displacement sensor 22 to receive laser light from the laser displacement sensor 22. The outer lower punch holder 4 is provided with a laser displacement sensor 24 for the outer lower punch, and the outer lower punch holder 9 is located below the laser displacement sensor 24 to receive the laser beam from the laser displacement sensor 24. The receiving reflecting plate 25 is attached. The outer lower punch holding section 5 is provided with a laser displacement sensor 26 for the inner lower punch.
The inner lower punch holder 11 has a laser displacement sensor 26.
A reflector plate 27 is mounted below and receives the laser beam from the laser displacement sensor 26. Each of these reflectors can be easily attached and detached by tightening half nuts with bolts.

Each of these laser displacement sensors 22, 24, 26 is equipped with a light emitter and a light receiver.
．． A laser beam is projected toward the reflectors 23, 25, and 27.
The laser beam reflected by 27 is received by the light receiving section, and the intensity of the laser beam at the time of projection is compared with the intensity of the laser beam at the time of reflection.
．． 27 is detected.

Each laser displacement sensor 22, 24, 26 has an amplifier circuit 28
The display circuit 29 is connected to the display circuit 29 via the display circuit 29, and a signal is output from the display circuit 29 to the display device 30.

In the display circuit 29, each laser displacement sensor 22.24.2
Laser type displacement sensor output from 6 22.24.26
The position of the lower end of the upper punch 8 with respect to the upper surface of the die table 3, and the upper end of the outer lower punch 10 with respect to the upper surface of the die table 3 is determined based on the signal obtained by measuring the distance between the reflector 23, 25, and 27. The position is converted into the position of the upper end of the inner lower punch 12 with respect to the upper surface of the die table 3. Also, since the reflector plates 23, 25, 27 move up and down together with each punch holder 7.9.11, each punch 8.
During the movement of 10.12, the position of each punch 8.10.12 relative to the upper surface of the die table 3 changes, that is, each punch 8
．． 10.12 movement amounts can be detected simultaneously.

Next, a press operation in this press apparatus and an operation for detecting displacement of each punch will be explained.

With this press device, for example, the powder compact 3 shown in FIG.
1 shall be pressure molded. When molding a compact, the inch-lower punch 12 and the outer lower punch 10 are inserted into the die formed on the die plate 3 of the apparatus main body 1, and powder is filled into the die using a powder feeder (not shown). Each pressurizing arm 19 to 21 is rotated by a rotary cam, and the upper punch holder 7, outer lower punch 9, and inch lower punch 11 are moved up and down, respectively, to press the powder inside the die part and form the powder as shown in FIG. The body 31 is molded. Figure 2 shows the steps taken when filling the die with powder and when sweeping out the powder.
The positions of the upper punch 7, outer lower punch 10, and inch lower punch 12 in the die section during powder compression are shown.

Next, a method of detecting the displacement of each punch will be explained.

The light emitting part of the laser displacement sensor 22.24.26 provided in each holding part 2.4.5.6 corresponding to each holder 7.9.11 of the upper punch, outer lower punch, and inch lower punch is A laser beam is irradiated onto a reflecting plate 23.25.27 provided on each holder, and the laser beam reflected by the reflecting plate 23.25.27 is received. Laser displacement sensor 22.24.2
The light receiving part 6 outputs a signal according to the reflected laser light,
After this signal is amplified by an amplifier circuit 28, it is converted into a display signal by a display circuit 29 and displayed, for example, digitally by a display device 30. In the display device 30, a laser displacement sensor 22.2
4.26 and the reflection plate 23, 25, 27, the position of the upper bunch 8 with respect to the die table 3, and the position of the outer lower punch 1 with respect to the die table 3 are determined.
0 position, inch lower punch 12 against die table 3
Display the converted value at the position.

That is, the position of the upper punch 8 is detected by the laser displacement sensor 22 projecting a laser beam onto the reflecting plate 23 and receiving the reflected laser beam. The position of the lower outer punch 10 is detected by the laser displacement sensor 24 projecting a laser beam onto the reflecting plate 25 and receiving the reflected laser beam. The position of the inch-lower punch 12 is detected by the laser displacement sensor 26 projecting a laser beam onto the reflecting plate 27 and receiving the reflected laser beam.

Next, a case will be described in which the positions of the punches 8, 10, and 12 are detected and the positions of the punches are adjusted.

When each holder 7.9.11 of the upper punch, outer lower punch, and inner lower punch moves in the vertical direction, each holder 7.
．． The reflecting plate 23.25.27 provided at 9.11 moves in the vertical direction, and the distance between the reflecting plate 23.25.27 and the laser displacement sensor 22.24.26 changes. Therefore, the intensity of the laser light emitted from the laser displacement sensor 22, 24, 26 and reflected by the reflection plate changes. This change can be displayed and viewed on the display device. Therefore, the amount of positional displacement of the reflecting plates 23, 25, and 27 can be displayed as the amount of displacement of each holder.

FIG. 3 is a diagram showing the phase change of the upper bunch 8 with respect to time during powder filling, powder sweeping, and powder compression. FIG. 4 is a diagram showing the phase change of the lower outer punch 10 with respect to time during powder filling, powder sweeping, and powder compression. FIG. 5 is a diagram showing the phase change of the inch-lower punch 12 with respect to time during powder filling, powder sweeping, and powder compression.

Here, with the top surface of the die table 3 as a reference, the positions of the outer lower punch and inch lower punch during powder filling, the position of the outer lower punch during sweeping, and the position of the outer lower punch during pressurization shown in FIGS. 4 and 5. Upper bunch 8, outer lower punch 10
and position of inch lower punch 9 N a % N b S
N c is displayed on the display device. That is, in this example, the thickness Tc at the center and the thickness Ts at the edge of the molded body are Tc
-Nc-Na.

Represented by TS-Nb-Na.

Therefore, if this value differs from the molding dimensions of the molded object, the compression adjustment nuts 15, 17 of the upper punch's pressure nut 14, the outer lower punch 10, and the inner lower punch 12
Alternatively, the filling adjustment nuts 16 and 18 may be adjusted while checking the value output on the display device 30.

In this way, the position of the punch is displayed by the output from the laser displacement sensor at the same time as press forming, so the position of the punch changes due to loosening of the nut during forming, and changes in the position of the punch due to changes in powder characteristics or uneven filling. can be quickly grasped, and fine adjustments to the nut can also be easily confirmed on the display.

Furthermore, it is possible to easily change the product type or replace the punches.

Note that the displacement sensor is not limited to a laser displacement sensor,
In addition, an optical displacement sensor can be used.

The type of press device is not limited to the embodiment, and other types can also be used.

The application of the press device is not limited to molding powder compacts, but can also be applied to pressing metal products.

[Effects of the Invention] As explained above, since the press device of the present invention has a function of detecting the position of the punch using an optical position detection sensor, it is possible to easily detect the position of the punch with high accuracy. can.

If the punch side is equipped with a mechanism, such as a nut, that sets the upper limit position and lower limit position, the nut may loosen due to vibrations when the punch moves up and down, and the position of the nut may change. The position of the nut may change when the part to which the punch is attached is disassembled and reassembled to replace the punch. When the position of the nut changes in this way, the position of the punch also changes accordingly. In this case, the position of the punch can be adjusted easily and accurately by operating the nut while viewing the display of the output from the laser displacement sensor.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a diagram showing a schematic configuration of a press device, FIG. 3 to 5 are diagrams showing the displacement of a punch when a powder compact is press-molded using a press device, and FIG. 6 is a diagram showing a powder compact formed using the press device. 1...Device main body, 7...Upper punch holder, 8...
Upper bunch, 9... Outer lower punch holder, 10...
Outer lower punch, 11... Inch lower punch holder, 1
2...inch lower punch, 22.24.26...laser type displacement sensor, 23.25.27...reflection plate.

Claims (2)

[Claims] (1) A press device equipped with a function of detecting the position of a pressurizing punch using an optical position detection sensor. (2) The press device according to claim 1, further comprising a mechanism on the punch side for setting the raised position and the lowered position, respectively.