JPH0790325B2 - Inspection equipment for forged products - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection device for inspecting all the forged products successively formed by a forging machine in the machine and immediately discharging defective products.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
As a means for inspecting for defects in the forging product in the forging machine, the front dead center position of the ram with the punch for punching is measured, or the punching pressure in each forging process is measured to detect those abnormalities. It is known that a defect of a pressed product is determined by.

In such a means, in addition to the occurrence of a so-called defective product in which the size of the formed forging product is out of size, an abnormal condition occurs when the forged product is not detached from the punch or stuck in the die during the forming process. Is detected, and in such a case, if the operation is continued, it may lead to a serious failure or damage of the forging machine. Therefore, when the abnormality is detected, the operation of the forging machine is once stopped.

Therefore, even if a defective product that does not adversely affect the forging machine itself is generated, the operation of the forging machine is stopped in each case, and the production efficiency is lowered.
In addition, defective products often remain in the forging machine, so the operator had to find and take them out.

As another means, after completion of molding, it is also possible to inspect all of the pressed products using a parts feeder or the like, but since the inspection process is separately provided, the manufacturing line becomes large. There was a flaw.

[0006]

The inspection apparatus for a forged product according to the present invention has been completed in view of the above points, and the inspection device for removing the forged product formed by the forging machine out of the machine. A sensor provided on the inlet side for detecting the shape of a passing forging product and outputting a detection signal thereof, a reference shape storing means for storing in advance a reference signal of the shape of the forging product, and detection sequentially output from the sensor Comparing the signal with the reference signal of the reference shape storage means, comparing means for outputting a defective signal when the detection signal deviates from the reference signal, and provided on the outlet side of the extraction conduit,
A discharging mechanism for receiving a defective signal from the comparing means and discharging the corresponding pressed product out of the predetermined collecting position.

[0007]

When the final forging process is completed and the forged product is projected into the take-out pipe, its shape is detected by passing through the position of the sensor, and the detection signals are sequentially output.
The detection signals that are sequentially output are compared with the reference signal of the shape of the forged product stored in advance in the reference shape storage means in the comparison means, and if the detection signal deviates from the reference signal, a defective signal is output.

When a defective signal is issued, the discharge mechanism provided on the outlet side of the discharge conduit operates in a predetermined manner, and the corresponding pressed product is discharged as a defective product outside the collection position.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 and 2, reference numeral 1 denotes a die block in which the same number of dies corresponding to a plurality of punches mounted on the front surface of a ram (not shown) are arranged in the order of the forming process, and the die side of the final process. On the one hand, there is provided a take-out position A on which a projecting pin 2 capable of advancing and retreating is provided, and on the front thereof, a receiving tube 5 is fitted in a mounting hole 4 formed in the block 3, and at the rear end thereof, in the discharge direction on the way. Is connected to the take-out tube 7 which is provided with a vacuum pressure generator for generating a suction force, and when the forging product a, which has been molded in the final step, is conveyed to the take-out position A by the finger 8, it is projected. When the pin 2 is advanced and protruded, it enters the take-out tube 7 through the inside of the receiving cylinder 5, is sucked by the action of the vacuum pressure, and is guided through the inside of the take-out tube 7 to a predetermined recovery position outside the forging machine. Like That.

Next, the structure of the inspection portion of the pressed product a will be described in detail. A ring-shaped distance sensor 9 for detecting the shape of the pressed product a is sandwiched and fitted by a holder 10 made of synthetic resin on the inner circumference of the receiving cylinder 5 on the inlet side. This distance sensor 9 uses a waveform pattern w as shown in FIG. 3 in accordance with the distance between the inner peripheral detection surface and the surface of the forged product a when the forged product a passes through it. The detection signal of the shape of the pressed product a is output.

As shown in FIG. 2, the distance sensor 9 is connected to a switching means 11 for switching the detection signal to the shape signal calculating means 12 and the comparing means 13 and sending it. The shape signal calculation means 12 functions to take in the detection signal of the first forged product a formed by the forging machine and calculate the averaged shape signal of the corresponding forged product a based on the detection signal of a fixed number of non-defective products. To do.

The shape signal calculation means 12 and the limit value input means 14 are connected to the reference shape storage means 15.
The limit value input means 14 is for inputting the limit value of the shape allowed for each type of forging product.

The reference shape storage means 15 adds the limit value input from the limit value input means 14 to the shape signal calculated by the shape signal calculation means 12 to calculate a reference signal serving as an actual judgment reference. Performs the function of remembering.

The comparison means 13 sequentially compares the detection signal from the distance sensor 9 with the above-mentioned reference signal, and outputs a defective signal when the detection signal deviates from the reference signal.

A discharge mechanism 16 composed of a damper is provided on the outlet side of the above-mentioned take-out tube 7, and when a defective signal is output from the comparison means 13, the discharge mechanism drive means 17 is provided.
The discharge port 18 of the discharge mechanism 16 is opened for a certain period of time via the.

Next, the operation of this embodiment will be described with reference to the flow chart of FIG. When the operation of the forging machine is started, and the forging products a sequentially formed by it are finished in the final process and are ejected into the receiving pipe 5 by the projecting pin 2, the forging product a passes through the distance sensor 9. By doing so, the shape is detected by the waveform pattern, and initially the switching means 11 is switched to the shape signal calculating means 12 side, so that the detection signals are sequentially fetched and stored in the shape signal calculating means 12, The operation of the press machine is once interrupted when the signal is captured N times.

During the interruption, a check is performed as to whether or not all N detection signals are non-defective products, and if defective products are mixed, the above-mentioned N times of taking-in of detection signals are performed again.

If all N pieces are non-defective, a shape signal which is an averaged shape of the shapes is calculated based on the detected waveform patterns, and is output to the reference shape storage means 15.

When the reference shape storage means 15 receives the shape signal, the reference shape storage means 15 extracts the limit value of the corresponding pressed product a from the limit value input means 14, and calculates a reference signal for determination in which the limit value is added to the shape signal. To remember.

When this is completed, the operation of the press machine is restarted, the switching means 11 is switched to the comparison means 13 side, and thereafter, the detection signal from the distance sensor 9 is output to the comparison means 13 for comparison. In the means 13, the detection signal is sequentially compared with the reference signal stored in the reference shape storage means 15.

If the detection signal is within the reference signal, that is, if it is a non-defective product, the pressed product a is conveyed as it is to the recovery position through the take-out tube 7 while the discharge port 18 of the discharge mechanism 16 is closed.

On the other hand, if the detection signal deviates from the reference signal, that is, if it is a defective product, the comparing means 13 outputs a defective signal and the door of the discharging mechanism 16 swings for a certain period of time as shown by the chain line in FIG. The outlet 18 opens, and the defective product falls into the discharge box 19 and is discharged.

As a mechanism for discharging defective products, in addition to the damper type of the above-mentioned embodiment, an inspected forged product, which is effective for small products such as machine screws, is temporarily mounted on the feeder. It may be taken out by another sorting function, for example, if it is a non-defective product, it is blown to the collecting position by air, and if it is a defective product, the air is stopped and the product is discharged by a feeder.

[0024]

As described in detail above, according to the apparatus of the present invention, the inspection position is provided at the take-out position of the forged product, that is, in the forging machine. By contrast, the inspection can be performed without increasing the production line. Further, when a defective product is found, it is automatically discharged by the discharging mechanism, so that it is possible to achieve complete automation of the line without requiring labor for removing the defective product.

Further, since the forging product itself is inspected, it is necessary to stop the forging machine one by one, as in the case of simulating the occurrence of defective products due to the abnormal position of the pre-dead center of the ram and the hitting pressure in the forging process. That is, there is an effect that the defective product can be inspected and discharged separately while the press machine is continuously operated, and the production efficiency is not deteriorated.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of a take-out portion of a pressed product according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram of the present embodiment.

FIG. 3 is an explanatory diagram of a detection signal of a pressed product.

FIG. 4 is a flow chart of the operation of the present embodiment.

[Explanation of symbols]

a: pressed product 5: receiving pipe 7: take-out tube (take-out pipe line) 9: distance sensor (sensor) 13: comparing means 15: reference shape storing means 16: discharging mechanism 17: discharging mechanism driving means

Claims (1)

[Claims] 1. A sensor, which is provided on the inlet side of an extraction pipe for taking out a forged product formed by a forging machine to the outside of the machine, detects a shape of the forged product passing therethrough and outputs a detection signal thereof, A reference shape storage unit that stores a reference signal of the shape in advance, and a detection signal sequentially output from the sensor is compared with a reference signal of the reference shape storage unit, and a defective signal is output when the detection signal deviates from the reference signal. And a discharge mechanism that is provided on the outlet side of the extraction conduit and that discharges the corresponding pressed product to the outside of a predetermined recovery position in response to a defective signal from the comparison means. Characterized forging product inspection device.