JPH06328156A - Quality detector in press work - Google Patents

Abstract

PURPOSE:To more correctly discriminate the acceptability or the unacceptability of the forming state of a product by excluding a human factor required for inspecting the acceptability or the unacceptability of a press product. CONSTITUTION:In a press die 1, vibration sensors (a) to (f) are installed respectively in positions A to F in which a defective working may occur in a press product 2 by a press working. Vibrations generated when a press working is normally performed and vibrations detected by the vibration sensors (a) to (f), are compared with each other, and whether or not a defective working occurs in the press product 2 is discriminated. When press working are successively performed in plural press processes, information on defective working is successively shifted to be transferred to a next press process. Finally, it is prevented that the press product 2 of defective working is mixed up with the press product 2 normally worked to be palletized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quality detecting device in press working, which uses a vibration sensor installed in a press die to judge whether or not a working defect such as a crack has occurred in a press product. Is.

[0002]

2. Description of the Related Art In plastic working such as press working, a crack or the like generated in a product during working becomes a fatal defect of the product. Therefore, conventionally, a plastic working specialist having a high degree of skill usually confirms the quality of the product and attempts to guarantee the quality. But,
Even if the technician who confirms the quality has a high level of skill, when pressing a large part such as a side frame of an automobile body, for example, check all locations where cracks and other processing defects occur. Since there is a limit to the number of defects, the discovery of defects in the product may be delayed, which may result in a defect in the manufacturing process of the final product.

Therefore, a press-molding defect detection method has been developed in order to perform a more complete product check (see Japanese Patent Laid-Open No. 3-124327). This method
The inspection embossing is also formed on a part of the panel that is formed by pressing, and the amount of this inspection embossing is set according to the amount of press forming of the product part that is most likely to cause processing defects. By inspecting the molding state of this emboss, it is judged whether the molding state of the product is good or bad.

[0004]

However, in the above-mentioned method for detecting a defective press-molding, an embossing for inspection must be formed on a member to be processed (hereinafter referred to as a work). The area must be reserved for the work. Therefore, the degree of freedom in designing the product part of the work may be reduced. In addition, since it is a person who inspects the emboss, it is not possible to completely judge whether the product is good or bad from the degree of molding of the emboss, but also the molded emboss accurately determines the molding state of the product. It cannot be expressed as. Furthermore, after molding the work,
Since the process for inspecting the emboss is necessary, the existence of this emboss inspection process hinders the improvement of productivity.

Therefore, the object of the present invention is to reduce the degree of freedom in the design of the press die, and to eliminate the human requirement for inspecting whether the press product is good or defective. It is an object of the present invention to provide a quality detection device in press working that enables more accurate discrimination of good and bad conditions and further improves productivity of press products.

[0006]

In order to achieve the above-mentioned object, the present invention has the following first structure. That is, a press die for manufacturing a press product, and a vibration sensor disposed in a portion of the press die where a press defect may occur in the press product due to press working by the press die. And comparing the vibration generated when the press working is normally performed with the vibration detected by the vibration sensor during the press working to determine whether or not a working defect has occurred in the pressed product. And a determination means.

When a pressed product is formed by a plurality of pressing steps, the following structure is obtained by using the first structure. That is, a plurality of press dies for manufacturing a press product through a plurality of pressing steps, and of the above-mentioned press dies, there is a possibility that processing defects may occur in the press product due to press work by the press dies. A vibration sensor arranged at each part, a vibration generated when the press working is normally performed by each press die, and a vibration sensor detected at the time of the press working by each press die By comparing each with the vibration, the determining means for determining whether or not the processing defect has occurred in the press product, the information regarding the press product determined to have the processing defect by the determination means to the subsequent pressing step. When the defect information transfer means to be transmitted and the plurality of pressing steps are all completed, the press is performed based on the information from the defect information transfer means. Only to palletizing normal product of the goods, and automatic palletizing equipment,
Is provided.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 2, a mold 1 is a die on a bolster side for press-molding a side panel outer 2 of an automobile body, and a slide side punch 3 is arranged above the mold 1 so as to be vertically movable. ing. When the side panel outer 2 is press-molded, a work for forming the side panel outer 2 is placed on the mold 1, and the punch 3 is lowered by hydraulic pressure to press-mold this work to process the side panel 2. To do. In FIG. 2, 4 is a punch on the bolster side, 5 is a blank holder, 6 is a punch holder,
Reference numeral 7 is a carrier, and 8 is a slider for supporting the punch 3.

When the side panel / outer 2 of the automobile body is pressed by the die 1 as shown in FIG. 1, a portion where a processing defect such as a crack is likely to occur due to the shape of the side panel / outer 2 as a product. There is. For example, in the figure, points A to F are portions where processing defects are likely to occur.
These parts can be determined by simulating with CAD and CAM when the mold 1 is designed. When these points A to F are determined, A of the mold 1
Vibration sensors a to f are embedded at positions close to points F to F, respectively. These vibration sensors a to f are installed so as to correspond one-to-one to the portions A to F of the side panel outer 2 where processing defects are likely to occur. Since the number of portions where a processing defect is likely to occur in the product due to press working differs depending on the shape and material of the work to be pressed, the number of vibration sensors embedded in the mold differs depending on the mold.

Each of these vibration sensors a to f is connected to a CPU 9 for detecting a quality abnormality in the central control unit U. This central control unit U is equipped with a CRT 10 for displaying a quality abnormality position, and the operator
The location of the processing defect can be recognized from the image displayed at T10. The quality abnormality detecting CPU 9 is connected to the master CPU 11 of the press line, and when the processing defects continuously occur, the master CPU 11 stops the press line (see FIG. 3).

A normal detection vibration sensor g for detecting vibration during normal pressing is also embedded in the mold 1. This vibration sensor g is arranged in the vicinity of a portion G where no processing defects such as cracks occur in the side panel outer 2 when the side panel outer 2 is pressed, and the vibration sensor g is also connected to the quality abnormality detecting CPU 9. To be done. The vibration sensor g is a sensor for monitoring a normal vibration resonance frequency during press working, and the CPU 9 detects the normal vibration resonance frequency monitored by the vibration sensor g and the vibration resonance frequency detected by the vibration sensors a to f. By comparison, it is determined whether or not a processing defect has occurred in the portions A to F.

Instead of providing the normal detection vibration sensor g, the abnormal value range of the vibration value may be input to the CPU 9 in advance, as indicated by block 12 in FIG. In this case, the vibration resonance frequency detected by the vibration sensors a to f is compared with the abnormal value range previously input to the CPU 9, and the CPU 9 determines whether or not a processing defect has occurred at the portion A to F. To do. The vibration sensor a
The vibration resonance frequency detected by the vibration sensors a through f and the normal vibration resonance frequency monitored by the vibration sensor g are compared and compared for each characteristic. In addition, the term “working defect of work” as used herein mainly means a crack generated in the work.

Various sensors can be used as the vibration sensors a to g, but it is preferable to use a sensor of a type in which a high-sensitivity piezoelectric element is incorporated in the sensor head portion and vibration is converted into a switch signal.

Next, the operation of the above embodiment will be described. While the side panel outer 2 is normally pressed, a plurality of pressing steps are continuously performed as shown in FIG. That is, in the step (a) of FIG. 4, the work is subjected to the first press working between the die 1 and the punch 3, and the side panel outer 2 is roughly formed. Then
In the step (b), the side panel outer 2 is pressed by the mold 1 and the punch 3 again, and the side panel outer 2 is pressed.
Prevents spring back of outer 2. In the step (c), trimming processing 2a, 2a is performed on the edge portion of the side panel outer 2, and flange processing is performed in the step (d). Then, in the step (e), the side panel outer 2 is perforated, and after passing through the step (f) of sorting the non-defective product and the defective product, it is sent to a palletizing device (not shown).

Now, in the pressing step (a), the side panel
It is assumed that a crack has occurred at the part A of the outer 2. The vibration sensor a detects the vibration resonance frequency at this time, and the CPU 9
Enter this into. The CPU 9 determines that the vibration resonance frequency sent from the vibration sensor a is abnormal, displays the location of the abnormality on the CRT 10, and stores the fact of the abnormality and the location of the abnormality. Further, the CPU 9 operates the abnormal product instruction sampling counter 13 to turn on the abnormality occurrence display light 14.

Even if a crack occurs in the portion A of the side panel outer 2, the side panel outer 2 is sent to the next steps (b) to (e) and sequentially processed. However, since the information that the crack has occurred at the part A of the side panel outer 2 is shifted to the steps (b) to (e) by the CPU 9, the side panel outer 2 having the crack at the part A is selected in the sorting step. In (f), the product is sorted as a defective product, is attached with the quality abnormal portion actual product delivery card 15 issued by the CRT 10, and is sent to the reprocessing step. In addition, when processing defects continuously occur on the work, the master CPU 11 of the press line receives a signal from the CPU 9 to stop the entire press line.

A side panel in which no processing defects occur
The outer 2 is judged to be non-defective in the sorting step (f), palletized by an automatic palletizing device (not shown), and waits for processing into a final product.

[0018]

According to the present invention described in claim 1,
Since the processing sensor of the product is detected by using the vibration sensor attached to the press die, the processing failure can be surely detected. Further, since the required number of vibration sensors can be installed, even when a large part such as a side frame of an automobile body is pressed, it is possible to check all the locations where processing defects such as cracks occur. Moreover, since this check is performed at the same time as the press working and no separate process for checking the working defect is required, the productivity of the press working can be improved.

With the configuration as described in claim 2, when the work becomes a product through a plurality of pressing steps, the work defect information of the work is stored together with the work when the work sequentially moves through the pressing steps. The product is shifted to the next process and sent, and in the final stage, the press products with defective processing and the press products with normal processing are clearly distinguished, and defective products and normal processed products are mixed and palletized. The situation that happens is surely prevented.

[Brief description of drawings]

FIG. 1 is a plan view showing an arrangement example of a vibration sensor when a side panel outer of an automobile is pressed.

FIG. 2 is a side sectional view showing an example of a press die.

FIG. 3 is a block diagram showing a quality detection process of the present invention.

FIG. 4 is a flow chart when the present invention is applied to press working having a plurality of working steps.

[Explanation of symbols]

 1: Mold 2: Automobile side panel / outer 3: Slide side punch 4: Bolster side punch 5: Blank holder 6: Punch holder 7: Carrier 9: CPU 10: CRT af: Abnormality detection vibration sensor g : Normal detection vibration sensor AG: Parts where processing defects are likely to occur

Claims (2)

[Claims] 1. A press die for producing a press product, and the press die is arranged at a portion of the press die where a press defect may occur in the press product due to press working by the press die. Whether a processing defect has occurred in the press product by comparing a vibration sensor generated when the press working is normally performed with a vibration detected by the vibration sensor during the press working. A quality detecting device in press working, comprising: 2. A plurality of press dies for manufacturing a press product through a plurality of pressing steps, and among the press dies, a press defect by the press die causes a processing defect in the press product. A vibration sensor arranged in each of possible parts, a vibration generated when the press working is normally performed by each press die, and a vibration sensor when the press working by each press die is performed. Each of the detected vibrations is compared with a determination unit that determines whether or not a processing defect has occurred in the press product. Defect information transfer means for transmitting to the pressing process, and when the plurality of pressing processes are all completed, based on the information from the defect information transfer device, To palletizing only normal products of 'products, the quality detection apparatus in the press working, characterized in that it comprises an automatic palletizing device.