TECHNICAL FIELD

The present invention relates to at least one detection mechanism which can enable determination of the deformation amount while at least one work piece is being formed.

PRIOR ART

Forming processes are processes which create important form changes in metal pieces. Among the beginning forms, there are rectangular billets and plates and similar geometries. Studies of forming processes are realized in the form of giving the sufficient strain in order for the metal to take the desired form. Sheet forming processes need smaller forces when compared with inter-planar strain forces and mass forming. While making the decision related to which forming process is suitable, the tensile strength of the material is very important. Sheet metal is essentially anisotropic. The characteristics thereof change depending on the direction and orientation. Most of the faults which occur during forming results from thinning or tearing. While making the decision about the most suitable direction for forming, unit form change analysis is made.

Most sheet metal processes are realized in machines named as press. The tools of sheet metal processes are named as punch and die. Moreover, sheet press die is also used as a name. Sheet metal processes can be separated into categories like cutting, bending, deep drawing, etc. During these processes, sheet material is subjected to force under dense load and is formed. During this forming, sheet material is heated and formed. Because of this heating, undesired deformations can occur on the sheet material sometimes. Since these deformations are not foreseen, after production of each piece, each piece is subjected to a quality control process.

In the application with no ES2350665A1 known in the literature, a procedure and device are described which is developed for detection of drawing faults. As the sheet parts are stamped or drawn in press, such faults can be detected by analyzing the temperature, formed during deformation, by means of infrared thermograph and image analysis technique, and detection of cracks or breakages is realized by means of the bending or thinning limits in deformation. In order to realize this, just after the drawing process, the temperature in the deformation region on the metal sheet is directly displayed. However, in this application which is known in the art, it is understood from the figures that only one camera is used. Therefore, the image of all points of the pieces cannot be captured. Measurement is made at the end of the line. This leads to not noticing of a problem in case a problem occurs at the inlet of the line. Problems are faced in measurement because of surface brilliancy. Since measurement is taken from test value, the deep drawing process is not completely represented. In this system, the measurement speed is much lower than the real press process.

As a result, because of the abovementioned problems, an improvement is required in the related technical field.

BRIEF DESCRIPTION OF THE INVENTION

The present invention relates to a detection mechanism, for eliminating the abovementioned disadvantages and for bringing new advantages to the related technical field.

An object of the present invention is to provide a detection mechanism which can detect the deformation on a work piece formed in a processing machine.

In order to realize the abovementioned objects and the objects which are to be deducted from the detailed description below, the present invention is at least one detection mechanism which can enable determination of the deformation amount while at least one work piece is being formed. Accordingly, the improvement is that the subject matter detection mechanism comprises at least one camera which can detect temperature of said work piece after forming, and at least one control unit configured to realize comparison between at least one temperature map obtained by means of said camera and at least one forming limit curve which can give predetermined deformation limit values. Thus, if there is undesired deformation depending on the heating on the work piece, this deformation can be detected.

In a possible embodiment of the present invention, said cameras are provided preferably at four sides of the work piece during forming of the work piece. Thus, heat measurement is realized in an efficient manner from different sides of the work piece.

In another possible embodiment of the present invention, the control unit is configured to give a warning in case there is deformation. Thus, faulty work pieces can be easily separated.

BRIEF DESCRIPTION OF THE FIGURES In Figure 1 , a representative perspective view of the processing machine which has the subject matter detection mechanism is given.

In Figure 2, a representative temperature map obtained by forming of the work piece by the subject matter detection mechanism is given.

In Figure 3, a representative graphic, where the data obtained by forming of the work piece by the subject matter detection mechanism is transferred onto a forming limit curve, is given.

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the subject matter is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.

With reference to Figure 1 , the present invention relates to a detection mechanism (10). The subject matter detection mechanism (10) enables deformation detection depending on the heating amount during processing of the work piece in at least one processing machine (11 ). The processing machine (11) mentioned in the invention can be a machine configured to plastically form the work piece. In a possible embodiment of the present invention, the processing machine (11) is preferably a hydraulic press. However, the invention is not limited with this, and can be a different element which can be used in operations like punching, welding, cutting, etc. The process realized in the processing machine is essentially a sheet forming process. The work piece is preferably a sheet plate. The sheet forming process can be classified as cutting, bending, plastering, and forming by straining, and deep drawing. By means of these processes, the work piece can be formed in a rapid and economical manner.

There is at least one camera (12) at the detection mechanism (10). Said camera (12) is configured to be able to detect the temperature difference on the work piece. In order to be able to realize this, the camera (12) is preferably a thermal camera. The thermal camera (12) is a display system based on invisible IR energy (heat) as the imaging method, and where the colors and forms formed according to IR energy are detected in the general structure of the image. Thermal energy is spread in the invisible infrared range. This range is between red light and microwave rays. Thermal cameras (12) detect these light wavelengths which cannot be seen by the naked eye and provide visioning in a clear manner. Preferably four cameras (12) are provided at the processing machine (11). By means of this, the detection is improved by realizing temperature measurement from different sides of the work piece. The camera (12) is preferably positioned at the four corners of the processing machine (11). By means of this, temperature detection through different places of the work piece is enabled. This temperature detection is preferably realized just after the forming of the work piece. For providing this, the instant just after vertical movement of the press upper processing part is taken as reference in the processing machine (11). Temperature map (I) is formed by the thermal cameras (12) at this reference time.

In Figure 2, a representative temperature map (I) obtained by forming of the work piece by the subject matter detection mechanism (10) is given. Accordingly, temperature map (I) is obtained just after forming of the work piece. This temperature map (I) gives the highest temperature of the work piece part by part after forming of the work piece. Meanwhile, critical temperatures are observed on the work piece where deformation is excessive and thinning is faced. The temperature map (I) is essentially provided in the form of dot cloud, and the temperature data, which exists at the obtained maximum deformation point, is used and the deformation amount and thinning value are obtained from the temperature data which corresponds to each critical point. Colored displaying is realized depending on temperature on the work piece (13) in the temperature map (I). These heated parts are the regions which are most prone to deformation and are compared with a predetermined forming limit curve (II). By means of this, tearing can be foreseen.

In Figure 3, a representative graphic, where the data obtained by forming of the work piece by the subject matter detection mechanism (10) is transferred onto a forming limit curve (II), is given. Accordingly, forming limit curve (II) is a graphic type which gives the formability limits of the sheet formed work piece. The forming limit curve (II) shows the behaviors shown by sheet materials under the conditions of deep drawing, and forming by straining. By means of the forming limit curve (II), the behaviors of sheet materials where drawing and pressing tests are applied can be analyzed in two dimensions. This forming limit curve (II) can be within deformation limits of the work piece and can be taken as a reference for temperatures. Depending on the result of detection realized by means of thermal cameras (12), comparison of the forming limit curve (II) can be realized.

The detection mechanism (10) comprises at least one control unit (20). Said control unit (20) is configured to realize comparison between the forming limit curve (II) and the temperature map (I) obtained by means of thermal camera (12). By means of this, the deformation which may occur on the work piece is detected automatically after the process. In order to be able to realize this, the control unit (20) is configured to compare the forming limit curve (II) and the temperature map (I) and to make a decision. Depending on the result of the realized detection, the operator may be warned if deformation occurs. This warning can be audible or visual. In alternative embodiments, if deformation occurs, the operation of the processing machine (11 ) can be stopped.

Together with all these embodiments, by using the detection mechanism (10), the exceeding of the deformation beyond limit values after processing of the work piece is detected. While this detection is being realized, any personnel or any equipment except thermal camera (12) is not needed. By means of this, an economical and rational solution is provided.

The protection scope of the present invention is set forth in the annexed claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention.

REFERENCE NUMBERS

10 Detection mechanism

1 1 Processing machine 12 Camera

13 Work piece

20 Control unit (I) Temperature map

(II) Forming limit curve