KR101037131B1 - Automobile shell reconsideration processing defect evaluation system and the evaluation method - Google Patents

Abstract

The present invention checks the defects by checking the plating state of the outer plate material cut and bent in various forms and the inclusion of foreign matters, the uniformity of the surface, the elongation of the mechanical properties to finish the exterior of the car to increase the completeness of the product To minimize defect rate The present invention relates to an apparatus for evaluating work defects of automobile exterior materials and an evaluation method thereof, and more particularly, to a hydraulic unit unit for generating hydraulic pressure, a frame unit for support, an upper mold installed at an upper portion of the frame unit, and an upper mold. The lower mold is installed at the lower part of the frame and the plated steel sheet to be tested is placed, the fixed mold fixedly installed at the center of the lower mold, and a control unit for controlling the operation of hydraulic and molds.

Thus, after forming the plating layer on the steel plate used as the exterior plate of the automobile, it is possible to easily determine the defects of the plating layer, so that the test conditions are simple, the test time is saved, and the bending layer is changed after bending for the test of the plated steel sheet. And by checking the elongation can be set the optimum conditions for the machining has the effect of reducing the defective rate during processing.

Automobile, exterior material, plating, steel plate, mold, hydraulic pressure, processing defect, dross

Description

Mobile shell reconsideration processing defect evaluation system and the evaluation method}

The present invention relates to an apparatus for evaluating processing defects of an automobile exterior plate and a method for evaluating the same, in particular, a poor plating state of the exterior plate which is cut and bent in various forms in order to finish the exterior of the automobile, and whether foreign matters are mixed, the uniformity of the surface, By checking the elongation, which is a mechanical property, to check for defects, The present invention relates to an apparatus for evaluating processing defects of automotive exterior materials and a method for evaluating the same.

In general, cold rolled steel sheets for automobiles are manufactured through a process of degreasing, continuous annealing, skin pass rolling, antirust oil, etc. in a continuous annealing process after pickling and rolling in a constant condition in a continuous pickling rolling facility. After that it is supplied to the car company.

In this way, the cold rolled steel sheet supplied to the automobile company is cut (blanked) according to the body part to be applied to the steel plate in the body assembly process, presses the desired shape in the molding process, and then spot welds are assembled. do. The assembled car body is subjected to wiping using petroleum compounds and alkali degreasing after washing through a degreasing process of removing surface foreign substances and oil, and electrodeposition coating is performed through a washing process.

In addition, the cold rolled steel sheet for automotive exterior should not only be excellent in workability, but also a dent phenomenon, which is pressed down, should not occur. In particular, in the part subjected to low deformation, the extension deformation should be excellent, and in the part subjected to the deep processing, the deep workability should be excellent. Conventionally, steel plates used for outer plates of doors, hoods, trunks, etc. of automobiles are high strength cold rolled steel sheets for tensile strength of 35 to 40 kgf / mm class ² deep processing or 35 kgf / mm class ² thermosetting cold rolled steel sheets (BH steel).

In addition, the cold rolled steel sheet for automobile exterior plates is plated to prevent corrosion of the surface and to improve adhesion of paint. At this time, the plating treatment to maintain a clean state to prevent impurities from entering the exterior.

However, the cold-rolled steel sheet for automotive exterior plated surface is subjected to the coating process after the process of cutting and bending to be used in various parts of the car, in which case, if the coating layer is uneven or foreign matter is mixed The degradation of the completeness of the plating layer peeling phenomenon occurs when bending, when bending without considering the elongation was a problem that occurs.

On the other hand, the cold-rolled steel sheet for automotive exterior plated with such a surface is judged for defects by visual inspection, but impurities, residues, foreign substances, and cracks finely mixed in the plating layer cannot be visually determined, and thus, a visual inspection inspection certificate is required. When using the plated steel sheet received there was a problem that often occurs.

Thus, there is an urgent need for an evaluation test apparatus and an evaluation method that can be tested to easily find defects that cause various defects when cutting and bending the plated steel sheet in place of visual inspection.

Therefore, the present invention has been made in view of the above-described problems of the prior art, and after forming a plating layer on a steel plate used as an exterior plate material of a vehicle, a device defect evaluation apparatus for an automobile exterior plate material which enables to easily determine a defect of the plating layer. The purpose is to provide.

Further, another object of the present invention is to set the optimum conditions for processing by checking the change and elongation of the plating layer after bending for the test of the plated steel sheet.

In addition, another object of the present invention is to reduce the frictional resistance by chromium plating the surface of the mold in contact with the plated steel sheet.

In addition, another object of the present invention is to polish the test surface to closely check the various defects that can not be confirmed by the plating layer.

In addition, another object of the present invention to provide an evaluation method that can test the plated steel sheet simply through the processing defect evaluation apparatus.

In order to achieve the above object, the present invention is installed inside the case and the hydraulic pump and control valves for supplying, withdrawing, and controlling the hydraulic oil stored in the hydraulic tank to generate the hydraulic force is formed, pressurizing the hydraulic oil at high speed Hydraulic unit unit consisting of an accumulator for installation, a plurality of pillar frames are installed upright around the upper portion of the bottom frame is installed on the installation surface, the frame portion consisting of a ceiling frame is installed on the top of the pillar frame, the ceiling of the frame portion It is installed on the frame and is operated in the up / down direction by the operation of the hydraulic cylinder supplied with hydraulic oil from the hydraulic unit part. The upper mold has clamping grooves formed on both sides of the lower part, and is installed on the bottom frame of the frame part. In the up / down direction by the operation of the cushion hydraulic cylinder At the same time, the plated steel sheet to be subjected to the work bonding test is placed, and the lower mold is formed with the clamping protrusion inserted into the clamping groove, and the upper mold is lowered to press the plated steel sheet together with the lower mold. It is characterized by consisting of a fixed mold that is inserted into the upper mold so that the center portion of the plated steel sheet is pulled and raised while descending, and the hydraulic unit and the control unit for controlling the upper / lower mold, the fixed mold.

As a preferred embodiment of the present invention, the upper and lower molds and the fixed mold is characterized in that the chromium plating layer is formed on the surface to minimize the wear phenomenon by friction with the plated steel sheet.

According to a preferred embodiment of the present invention, the hydraulic cylinder hydraulic force of the upper mold provides an apparatus for evaluating the processing defect of the outer panel material, characterized in that configured to be larger than the hydraulic pressure of the hydraulic cylinder of the lower mold.

According to a preferred embodiment of the present invention, an evaluation method using an apparatus for evaluating processing defects of an outer panel of a vehicle includes a specimen preparation step of preparing a test by cutting a plated steel sheet to be tested according to a specification, and a specimen preparation step. After going through the specimen installation step and the specimen installation step to install the center of the plated steel plate exactly on the upper part, supply the hydraulic oil to the hydraulic cylinder and the cushion hydraulic cylinder through the operation of the control unit, so that the upper mold is moved downward After operating the mold operation step and the mold operation step, the upper mold is continuously lowered so that the lower mold is lowered together so that the fixed mold is inserted into the upper mold and the plated steel sheet is pulled to the upper part. After the plated steel sheet pressurizing step and pressurizing plated steel sheet pressurizing step to form a raised test surface, After polishing the test surface of the steel sheet using the abrasive grind, and after the surface polishing step, the polishing is completed, dross, plating bubbles, impurities, cracks, depressions, etc. In order to confirm the existence of defects such as uplifts, it provides an evaluation method using an apparatus for evaluating processing defects of exterior panels.

As described above, the present invention can form a plated layer on a steel plate used as an exterior plate of an automobile, so that defects of the plated layer can be easily determined, thereby simplifying test conditions and saving test time.

In addition, after bending for the test of the coated steel sheet, it is possible to set an optimal condition for processing by checking the change and elongation of the plated layer, thereby reducing the defective rate during processing.

In addition, chromium plating the surface of the mold in contact with the plated steel sheet to reduce the frictional resistance to extend the life of the component to reduce the maintenance, maintenance costs.

In addition, it is possible to closely check the various defects that can not be confirmed by the plating layer by polishing the test surface has the effect of improving the completeness and reliability of the product by checking the latent defects.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

As shown in Figures 1 to 3, the processing defect evaluation apparatus of the automotive exterior plate material of the present invention is a hydraulic unit unit 10 for generating a hydraulic pressure, the frame portion 20 for support, the frame portion 20 The upper mold 30 is installed on the upper portion of the lower mold 40 and the lower mold 40 is installed on the lower portion of the frame portion 20 to be placed on the frame 20 to correspond to the upper mold 30, and the lower mold ( The evaluation apparatus 100 is composed of a fixed mold 50 fixedly installed at the center of 40 and a control unit 60 for controlling the operation of hydraulic pressure and molds.

First, the plated steel sheet 200 is a zinc plated layer attached to the surface of the steel sheet produced in the base material production process, such as steel mill, and cut into a square plate shape for the defect evaluation test using the evaluation device 100 Prepare.

The hydraulic unit unit 10 is installed in the case 11 and is configured to supply and recover hydraulic oil to generate hydraulic force, and in the present invention, the components inside the case 11 in consideration of the aesthetic appearance. And a hydraulic tank 12 for storing hydraulic oil, a hydraulic pump 13 for circulating hydraulic oil, and a control valve 14 for controlling and adjusting the pressure, flow rate, and direction of the hydraulic oil. , Relief valves, check valves) are installed in connection, and the accumulator 15 for pressurizing the hydraulic oil at high speed is installed at the rear side.

The frame part 20 is provided with a plurality of pillar frames 22 installed upright around the top of the bottom frame 21 installed on the installation surface, the ceiling frame 23 is installed on the top of the pillar frame 22 Is done.

Here, the bottom frame 21 is firmly installed using an anchor bolt on the installation surface in order to prevent the initial position is changed or fine tremors, movement by the vibration generated during the operation of the evaluation apparatus 100.

In addition, a control valve 23a which performs the same function as the control valve 14 of the hydraulic unit unit 10 is further installed on the ceiling frame 23 for the stable circulation of the hydraulic oil, so that the manager can check the failure. An inspection pan 24 is installed to prevent the function and fall of the inspection passage.

The upper mold 30 is installed in the ceiling frame 23 of the frame part 20 and is started up / down by the operation of the hydraulic cylinder 31 which is operated by receiving hydraulic oil from the hydraulic unit 10. Clamping grooves 32 are formed on both lower sides.

At this time, the upper mold 30 is in the form of a rectangular box, the lower surface center portion is formed with an insertion groove 33 into which the lower mold 40 can be inserted, the fixed mold 50 in the center of the insertion groove 33 The test surface groove 34 to be inserted is formed.

The lower mold 40 is installed in the bottom frame 21 of the frame part 20 and is started up / down by the operation of the cushion hydraulic cylinder 41 which is operated by receiving hydraulic oil from the hydraulic unit part 10. While the plated steel sheet 200 to be subjected to the work coupling test is settled, a clamping protrusion 42 inserted into the clamping groove 32 is formed.

For reference, in the present invention, by distributing the cushion hydraulic cylinder 41 to eight places to support the lower mold 40, even distribution of the pressing force is achieved.

Here, the hydraulic pressure of the hydraulic cylinder 31 of the upper mold 30 is configured to be supplied larger than the hydraulic pressure of the cushion hydraulic cylinder 41 of the lower mold 40. For example, when a hydraulic pressure of 200 bar is applied to the hydraulic cylinder 31, a hydraulic pressure of 50 to 190 bar is applied to the cushion hydraulic cylinder 41, and the cushion hydraulic cylinder 41 is operated by the hydraulic force of the hydraulic cylinder 31. The lower mold 40 is configured to be lowered while being pressed).

The fixed mold 50 is plated steel plate while the lower mold 40 is lowered by the pressing force of the upper mold 30 while the upper mold 30 is lowered to press the plated steel plate 200 together with the lower mold 40. The central portion of the 200 is configured to be inserted into the upper mold 30 to be raised and raised.

At this time, the fixed mold 50 is fixedly installed on the bottom frame 21 of the frame portion 20, the lower mold 40 is lowered while the cushion hydraulic cylinder 41 is pressed by the hydraulic force of the hydraulic cylinder 31 When lowered to the upper mold 30 is lowered to come into contact with the fixed mold (50).

In addition, the upper / lower molds 30 and 40 and the fixed mold 50 are formed by forming a chromium plating layer on the surface to minimize wear phenomenon caused by friction with the plated steel sheet 200.

In this case, chromium plating has high wear resistance, lubricity, heat resistance, corrosion resistance, release properties.

Due to the pressing action of the upper mold 30, the plated steel plate 200 placed in the lower mold 40 is inserted into the insertion groove 33 of the upper mold 30, the clamping groove 32 and the clamping projection 42 The both sides are bent by) and the lower mold 40 is pushed downward by the pressing force of the upper mold 30, while the fixed mold 50 enters the test surface groove 34, The central portion is raised to form the test surface 201.

When the plated steel sheet 200 is pressurized, both sides of the plated steel sheet 200 are bent by the clamping groove 32 and the clamping protrusion 42, and the plated steel sheet 200 is prevented from moving in the front / back / left / right directions. Play a role. Meanwhile, in order for the plated steel sheet 200 to be pushed upward by the fixed mold 50, the clamping groove 32 and the plated steel sheet 200 and the clamping protrusion 42 are clamped to generate a fine play.

The control unit unit 60 is configured to control the hydraulic unit unit 10 and the upper and lower molds 30 and 40 and the stationary mold 50.

At this time, the control unit 60 is the main power supply and cut off button, emergency stop button to cut off the power and operation in case of emergency, operation method selection button to select the operation mode to manual mode and automatic mode, to adjust the hydraulic force It consists of a hydraulic control button, a speed control button for adjusting the speed, a position button for determining a position, and a digital display for displaying various values digitally.

Referring to the operation of the present invention configured as described above are as follows.

As shown in Figure 4, the evaluation method for testing the defect of the plated steel sheet 200 using the evaluation apparatus 100 is a specimen preparation step (S1), a specimen installation step (S2), a mold operation step (S3), The plated steel sheet is pressed into a step S4, a surface polishing step S5, and a defect checking step S6.

1, 2 and 5, the specimen preparation step (S1) is a step to prepare a test by cutting the plated steel sheet 200 to be tested in accordance with the standard.

That is, after cutting the plated steel sheet 200 to a size suitable for the size to be tested using the evaluation apparatus 100, the cut surface is smoothly polished and finished.

Such, the size of the plated steel sheet 200 is produced as a specimen is manufactured to be a size of 600 × 600 mm in width as an example.

Thereafter, the specimen installation step (S2) is a step of installing while matching the center of the plated steel plate 200 on the upper portion of the lower mold 40 after the specimen preparation step (S1).

At this time, when the plated steel sheet 200 does not coincide with the center of the lower mold 40, the torsion phenomenon and the state of bending become poor, which is an important step to be installed correctly.

Next, after the mold operation step (S3) through the specimen installation step (S2), the hydraulic oil is supplied to the hydraulic cylinder 31 and the cushion hydraulic cylinder 41 through the operation of the control unit 60, the upper mold It is a step to operate so that 30 is moved downward.

That is, the upper mold 30 moves downward, pressurizes the plated steel sheet 200, and the plated steel sheet 200 is bent and inserted into the clamping groove 32 by the clamping protrusion 42 of the lower mold 40. It is a step to be supported so as not to move.

Next, the plated steel plate pressing step (S4) is passed through the mold operation step (S3), the lower mold 30 is continuously lowered so that the lower mold 40 is lowered together, the fixed mold 50 is the upper mold As the plated steel sheet 200 is pulled upward in the operation of being inserted into the inside of the 30, the pressed test surface 201 is formed in the center portion.

In other words, since the hydraulic force of the hydraulic cylinder 31 acts larger than the cushion hydraulic cylinder 41, the upper mold 30 moves the lower mold 40 by pushing it downward. At this time, the fixed mold 50 is to maintain a fixed state so that the lower mold 40 moves in the lower direction, the fixed mold 50 is protruded upwards.

Due to the protrusion of the fixed mold 50, the plated steel sheet 200 is also pushed upward to pass between the clamping groove 32 and the clamping protrusion 42. As such, the plated steel sheet 200 to be raised upward is bent and pulled between the insertion groove 33 of the upper mold 30 and the upper surface of the fixed mold 50 to form a test surface 201.

After the bending of the plated steel sheet 200 is completed, the upper mold 30 is moved to the initial position, and the bent plated steel sheet 200 is dismantled in the evaluation apparatus 100.

Then, the surface polishing step (S5) is a step of polishing the test surface 201 of the plated steel sheet 200 using an abrasive grind after the plated steel plate pressing step (S4).

Finally, the defect check step (S6) after the surface polishing step (S5), if the polishing is completed, such as dross (dross) generated during the rolling of the steel sheet, bubbles of the plating layer, impurities, cracks, depressions, ridges, etc. This step confirms the existence.

That is, when the test surface 201 is polished using the abrasive grind, various changes occur not only in the steel plate which has undergone deformation such as extension and scratching but also in the plating layer, so that the adhesion thickness of the plating layer is different or impurities are mixed easily with the naked eye. It is possible to determine whether or not to determine whether the product is released and to establish a standard such as processing method.

As a result, after the extension and bending of the plated steel sheet 200, various changes occurring in the interior of the plated layer can be accurately grasped through polishing, and the elongation can be confirmed, thereby simultaneously testing the mechanical properties.

In addition, the operation of the evaluation apparatus 100 is made of a semi-automated, it is possible to perform the test with a minimum number of people has the advantage of saving labor costs.

In addition, there is an advantage to extend the life of the mold by forming a chromium plating layer on the surface of the mold so as to minimize the friction phenomenon when bending the plated steel sheet 200.

Although the present invention has been shown and described with reference to certain preferred embodiments, the present invention is not limited to the above-described embodiments and has ordinary skill in the art to which the present invention pertains without departing from the spirit of the present invention. Various changes and modifications may be made by the user.

1 is a front view showing the installed state of the processing defect evaluation apparatus of the automobile exterior plate material according to the present invention,

2 is a front view of a state in which the molds are installed in the frame portion;

3 is a side view of a state in which the molds are installed in the frame unit;

Figure 4 is a flow chart of the evaluation method of the processing defect evaluation apparatus of the automotive exterior plate material,

5 is a process flowchart showing the evaluation method in the order of FIG.

<Description of Symbols for Main Parts of Drawings>

10: hydraulic unit part 11: case

12: hydraulic tank 13: hydraulic pump

14: control valve 15: accumulator

20: frame portion 21: floor frame

22: pillar frame 23: ceiling frame

30: upper mold 31: hydraulic cylinder

32: clamping groove 33: insertion groove

34: test groove groove 40: lower mold

41: cushion hydraulic cylinder 42: clamping protrusion

50: fixed mold 60: control unit

100: evaluation apparatus 200: plated steel sheet

S1: Specimen Preparation Step S2: Specimen Installation Step

S3: Mold operation stage S4: Plated steel sheet pressurization stage

S5: Surface polishing step S6: Defect check step

Claims (4)

The hydraulic pump 13 and the control valve 14 are installed inside the case 11 and supply, retrieve and control the hydraulic oil stored in the hydraulic tank 12 to generate the hydraulic force. Hydraulic unit unit 10 consisting of a pressure accumulator 15 for pressurizing, A plurality of pillar frames 22 are installed upright around the top of the bottom frame 21 installed on the installation surface, the frame portion 20 consisting of a ceiling frame 23 is installed on the top of the pillar frame 22 Wow, It is installed on the ceiling frame 23 of the frame part 20 and started up / down by the operation of the hydraulic cylinder 31 operated by receiving hydraulic oil from the hydraulic unit part 10 and clamping grooves 32 on both lower sides thereof. And the upper mold 30 is formed, Plating is installed on the bottom frame 21 of the frame part 20 and is operated to operate in the up / down direction by the operation of the cushion hydraulic cylinder 41 supplied with the hydraulic oil from the hydraulic unit part 10 to perform the work joining test. A lower mold 40 in which the steel plate 200 is placed and the clamping protrusion 42 is inserted into the clamping groove 32. While the upper mold 30 descends and presses the plated steel sheet 200 together with the lower mold 40, the lower mold 40 descends together by the pressing force of the upper mold 30, while the center portion of the plated steel sheet 200 Fixed mold 50 is inserted into the upper mold 30 so as to be raised and raised, A hydraulic unit unit 10 and upper / lower molds 30 and 40, and a control unit unit 60 for controlling the stationary mold 50; The upper and lower molds 30 and 40 and the fixed mold 50 have a chromium plated layer formed on a surface thereof so as to minimize wear phenomenon caused by friction with the plated steel sheet 200; The hydraulic pressure of the hydraulic cylinder (31) of the upper mold (30) is a hydraulic defect evaluation device of the outer shell material, characterized in that configured to be supplied larger than the hydraulic pressure of the hydraulic hydraulic cylinder (41) of the lower mold (40). delete delete delete

Images