KR102098806B1 - Impact test device for coating adhesion of cold roll steel sheet - Google Patents

Abstract

The present invention relates to a plating quality test device for a cold-rolled steel sheet which can continuously apply a drop impact with constant strength to a plating surface. The plating quality test device for a cold-rolled steel sheet comprises: a frame; a fixing support unit installed on the frame to fix and support a specimen consisting of a plated cold-rolled steel sheet to be tested; a lower jig positioned while coming in surface contact with the lower surface of the specimen fixed and supported on the fixing support unit; a lifting driving unit which is installed on the frame, and can be lifted by driving of a motor; an upper jig installed on a support bar vertically moving along a guide shaft installed on the frame, and separably installed on the lifting driving unit to ascend with the lifting driving unit and vertically descend by a free fall to strike the upper surface of the specimen of a portion corresponding to the lower jig; and a control unit to control driving of the lifting driving unit and the support bar on which the upper jig is installed.

Description

Cold Rolled Steel Plate Plating Quality Tester {IMPACT TEST DEVICE FOR COATING ADHESION OF COLD ROLL STEEL SHEET}

The present invention relates to a cold rolled steel sheet plating quality test apparatus, and more particularly, to a cold rolled steel sheet plating quality test apparatus capable of continuously applying a dropping impact to a plated cold rolled steel sheet with a constant strength.

In general, cold-rolled steel sheets produced in a steel mill undergo a plating process of plating a specific metal material on the surface in order to increase corrosion resistance or abrasion resistance and enhance the appearance of the steel sheet.

For example, a zinc plated steel sheet in which zinc is plated on the surface of a cold rolled steel sheet is produced, and this zinc plated steel sheet is widely used as a steel sheet for automobile exteriors due to its excellent corrosion resistance, weldability, and paintability.

When a plated steel sheet such as a galvanized steel sheet is produced, a plating quality test is conducted to determine whether plating is successful. If cold rolled steel sheet is produced as a defective product, the cold rolled steel sheet production line produces more than 50 tons per hour in a continuous process, so its loss cost is enormous.

The plating quality of the cold-rolled steel sheet is tested by plating the wire connected to the weight to the upper part of the pulley to a certain height and then dropping the weight into the specimen of the cold-rolled steel sheet to visually check whether the plating layer is peeled.

However, since this method is performed in a manual manner, since the drop height and impact amount of the weight are not constant, different impact amounts are applied to the specimen each time the test is performed. Therefore, the plating quality cannot be accurately tested. Since the shape is not uniformly formed, it is difficult to read finely.

In addition, since the weight is lifted and dropped by the operator, safety cannot be guaranteed in the vicinity of the specimen and the weight. Therefore, there is a great risk of safety accidents because the worker is exposed to danger.

Korean Patent Publication No. 10-2005-0015843

The present invention has been proposed to solve the conventional problems as described above, the object of the present invention is to maintain a constant strength to the plated cold rolled steel sheet while continuously applying a drop impact cold rolling that can accurately test the plating quality It is to provide a steel plate plating quality test apparatus.

Cold rolled steel sheet plating quality test apparatus proposed by the present invention includes a frame; A fixed support part installed on the frame to fix and support a specimen made of a plated cold rolled steel sheet to be tested; A lower jig positioned in a surface contact state on the lower surface of the specimen supported by the fixed support; An elevation driving unit installed on the frame and configured to move up and down by driving a motor; It is installed on a support bar that moves vertically along a guide shaft installed in the frame, and is detachably fixed to the lifting driving part so as to be able to rise together with the lifting driving part. An upper jig hitting the upper surface; A control unit for controlling the driving of the support bar on which the lifting driving unit and the upper jig are installed; It provides a cold-rolled steel sheet plating quality test apparatus comprising a.

On the front side of the fixed support portion, a transfer portion may be further provided to transfer the specimen, which has been hit through the upper jig, forward by a predetermined length.

The fixed support portion is composed of a clamp to which the tip of the specimen is fixed, and a plurality of rollers through which the specimen is slidably supported.

The elevating driving unit is composed of a ball screw rotating in place by the driving of a motor, and an elevating bar that raises an upper jig positioned in a descending state to a predetermined height while elevating by the rotation of the ball screw.

The lifting bar is provided with an electromagnet for raising the upper jig and free-falling the elevated upper jig.

The ball screw and the lifting bar are made to move up and down along the guide shaft installed in the frame, and the support bar is provided with a weight to adjust the impact strength of the specimen.

In the lower jig and the upper jig, a projection forming portion and a groove forming portion for forming protrusions and grooves in the specimen are respectively formed.

The apparatus for testing the quality of plating of a cold-rolled steel sheet according to the present invention can accurately determine the presence or absence of a defective plating because a constant strength impact can always be applied to a specimen made of a plated cold-rolled steel sheet.

In addition, it is possible to prevent the worker from being exposed to a safety accident because the motor's driving force is used instead of the operator's force to lift the weight to impact the specimen, and continuous work is possible, which greatly increases the working time compared to the conventional one. Can be shortened.

1 is a view of the main part of the cold-rolled steel sheet plating quality test apparatus according to the present invention as viewed from the front.
2 is a view of the cold-rolled steel sheet plating quality test apparatus according to the present invention as viewed from the side.
3 is a plan view of the cold rolled steel sheet plating quality test apparatus according to the present invention.
4 is a front view of the upper and lower jigs provided in the cold rolled steel sheet plating quality test apparatus according to the present invention.
5 is a perspective view showing a groove and a projection formed by applying an impact to a specimen by operating a cold rolled steel sheet plating quality test apparatus according to the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail.

1 to 3 are views of the cold rolled steel sheet plating quality test apparatus according to the present invention viewed from the front, side and plane, and FIG. 4 is a front view of upper and lower jigs provided to the cold rolled steel sheet plating quality test apparatus according to the present invention, 5 is a perspective view showing a groove and a protrusion formed by applying an impact to a specimen by operating a cold rolled steel sheet plating quality test apparatus according to the present invention.

As shown in the drawing, the apparatus for testing the quality of cold-rolled steel sheet plating according to the present invention includes a fixed support unit which is installed on the frame 2 and the frame 2 to fix and support a specimen 100 made of a plated cold-rolled steel sheet to be tested, A lower jig 4 positioned in a surface contact state on the lower surface of the specimen 100 supported by the supporting part, a lifting driving part 6 installed on the frame 2 for lifting operation, and the lifting driving part 6 The upper jig 8, which is detachably supported and descends freely from a certain height to strike the upper surface of the specimen 100 of the portion corresponding to the lower jig 4, and the lifting driving unit 6 and the upper jig ( It includes a control unit 10 for controlling the operation of 8).

The specimen 100 may be prepared by cutting a plated cold rolled steel sheet to be tested in a rectangular shape having a predetermined size, and the specimen 100 is moved forward by a predetermined length through the transfer unit 12 as described in detail later. It can be transported.

The fixed support portion comprises a clamp 14 to which the tip end of the specimen 100 is fixed, and a plurality of rollers 16 to which the specimen 100 is slidably supported.

The lift driving unit 6 is driven by a motor 18 driven by the control of the control unit 10, a ball screw 20 rotating in place by rotation of the motor 18, and rotation of the ball screw 20. It consists of a lifting bar (22) to elevate.

The ball screw 20 is composed of two and maintains the gap, and the upper and lower ends are supported on the frame 2 in a parallel state, and the lifting bar 22 is screwed along the outer circumferential surface of the ball screw 20 to elevate the lifting block 24 ) Is assembled so that the lifting block 24 is raised or lowered according to the forward or reverse rotation of the ball screw 20 that rotates together by the forward or reverse rotation of the motor 18.

One of the two ball screws 20 receives the driving force of the motor 18 directly, and the other is that the sprocket is connected to the chain 26 to transmit the driving force.

The lift driving unit 6 is configured to rise by a predetermined height under the control of the control unit 10, and the raising height of the lift driving unit 6 controls the signal of the rotary encoder that detects the rotational speed of the ball screw 20. 10) can be received and raised by a certain height, and accordingly, the raised height of the upper jig 8 can be fixed.

Therefore, since the impact of a constant strength can be always applied to the specimen 100, the presence or absence of defective plating can be accurately determined.

And the lifting bar 22 is provided with an electromagnet 28 so that when the lifting bar 22 is raised, the upper jig 8 can be raised in the vertical direction together.

The upper jig 8 is installed on a support bar 32 that can move in a vertical direction along a pair of guide shafts 30 fixed to the frame 2.

Both ends of the support bar 32 are provided with a slide member fitted to the outer circumferential surface of the guide shaft 30 so that the support bar 32 can vertically move along the guide shaft 30 in the vertical direction.

In addition, the support bar 32 is provided with a weight 34 to adjust the impact strength of the specimen 100, the weight 34 can be made of a variety of weights, depending on the specimen 100 weight different weight It can be selected and assembled.

The electromagnet 34 is made to apply or block power under the control of the control unit 10, and when the elevating bar 22 rises in the descending state, power is applied to the electromagnet 34 to upper the jig 8 It is fixed to the upper bar (8), such as lifting bar 22 can be raised.

And when the upper jig 8 is raised by a predetermined height, the power supply applied to the electromagnet 28 is cut off by the control of the control unit 10, and the upper jig 8 is vertically downward with the support bar 32. It falls and strikes the specimen 100.

Thus, as the upper jig 8 falls toward the lower jig 4, the protrusions 102 and the grooves 104 are respectively formed on the specimen 100 through the jig 4 and 8, so that the plating adhesion can be tested. .

To this end, the upper and lower portions of the lower jig 4 and the upper jig 8 are formed of a flat surface formed by protruding parts 4a, 8a and groove forming parts 4b, 8b at different positions, respectively. The protrusions 100a and the grooves 100b may be respectively formed in the 100).

Then, when the upper jig 8 falls and forms the projections 100a and the grooves 100b on the specimen 100, the ball screw 20 is rotated while the motor 18 is driven under the control of the control unit 10. The lift driving unit 6 is moved to the lower side.

When the elevating driving unit 6 descends and the electromagnet 28 fixed to the elevating bar 22 contacts the support bar 32, the signal is transmitted to the control unit 10 to control the motor 18 under control of the control unit 10. ) While rotating in the reverse direction, the ball screw 20 also rotates in place in the opposite direction.

Accordingly, as the lifting block 24 rises along the ball screw 20, the lifting bar 22 also rises at the same time, and at the same time, the support bar 32 to which the upper jig 8 is fixed also guides the shaft 30. Therefore, it rises by a certain height.

In this way, when the upper jig 8 rises together with the lift driving unit 6, the transfer unit 12 is driven by the control of the control unit 10 while transferring the specimen 100 to the front by a predetermined length.

The transfer unit 12 includes a motor 38 driven by the control of the control unit 10, a ball screw 40 connected to a rotating shaft of the motor 38 and rotated in place by driving the motor 38, It includes a transfer block 42 to move in the horizontal direction by the rotation of the ball screw 40.

The transfer block 42 is fixed with a clamp 14 to which the leading end of the specimen 100 is fixed, so that the transfer block 42 and the clamp 14 are configured to move together to transport the specimen 100. A plurality of guide shafts 44 are fitted to the transfer block 42 so that the transfer block 42 can be stably guided and transferred.

The transfer distance of the specimen 100 is forwarded by conveying the signal of the rotary encoder detecting the number of revolutions of the ball screw 40 moving the transfer block 42 by the control unit 10 to transfer the transfer block 42 by a predetermined length. When the transport block 42 is advanced, the specimen 100 is also advanced by a predetermined length.

Accordingly, while continuously advancing the specimen 100 by a predetermined length, the upper jig 8 may be dropped to continuously form protrusions 100a and grooves 100b for evaluating plating adhesion to the specimen 100 at regular intervals. have.

To use the apparatus for testing the quality of plating of a cold rolled steel sheet of the present invention as described above, first, the specimen 100 is seated on the roller 16 and the tip of the specimen 100 is fixed to the clamp 14 installed on the transfer block 42. .

Then, by using the operation panel of the control unit 10 to adjust the transfer distance of one section of the transfer block 42 and the elevation height of the lifting bar 22, the power is turned on.

Then, the power is supplied to the electromagnet 28 fixed to the elevating bar 22, which was in the lowered state, and the support bar 32 is fixed while being magnetized. In this state, the motor 18 is driven to drive the ball screw 20. When rotated, the lifting block 24 receives the guide of the guide shaft 30 and lifts the ball skew 20 along the lifting bar 22 and the supporting bar 32 to which the upper jig 8 is fixed. .

When the lift bar 22 is raised by the input height, the driving of the motor 18 is stopped, and at the same time, the power supplied to the electromagnet 28 is cut off, and accordingly, the support bar 32 has its own weight and weight ( 34) The weight of the upper jig (8) falls along the guide shaft (30) in the vertical direction, and the upper jig (8) strikes the specimen (100) supported on the upper side of the lower jig (4).

Accordingly, the same shape as the projections (4a) (8a) and groove forming portions (4b) (8b) formed on the upper and lower portions of the lower jig (4) and upper jig (8) on the specimen (100) made of a flat surface. The projections (100a) and the groove (100b) of each are formed.

When the projections 100a and the grooves 100b are formed in the specimen 100, the ball screw 20 is rotated while the motor 18 is driven by the control of the control unit 10 to lower the lift driving unit 6 downward. At this time, when the electromagnet 28 fixed to the lifting bar 22 is in contact with the support bar 32, power is supplied to the electromagnet 28 under the control of the control unit 10 so that the electromagnet 28 is supplied to the support bar 32. While being fixed, the motor 18 rotates in the reverse direction. Therefore, as the lifting block 24 rises along the ball screw 20, the upper jig 8 also rises by a predetermined height along with the lifting bar 22 and the support bar 32.

In this operation, while the motor 38 is driven by the control of the control unit 10, the ball screw 40 rotates, and accordingly the clamp block 14 for fixing the tip portion of the specimen 100 is fixed. The specimen 100 is advanced by a predetermined length while moving by a predetermined distance.

As this process is repeatedly performed, while continuously advancing the specimen 100, the upper jig 8 is continuously pulled up and then dropped to form a continuous projection 100a and a groove 100b at a predetermined interval in the specimen 100. can do.

When the projections 100a and grooves 100b are formed by dropping the upper jig 8 on the specimen 100 made of the flat surface, it is visually determined whether or not the plating layer on the surface of the specimen 100 is peeled, and whether or not plating is defective. You can check

In the above, the preferred embodiment of the present invention has been described for the purpose of illustration, but is not limited thereto, and it is also possible to carry out various modifications within the scope of the appended drawings and the detailed description of the claims and the invention.

2: Frame
4: Lower jig
6: Elevator Drive
8: Upper jig
10: control unit
12: Transfer section
14: clamp
16: roller
18, 38: motor
20, 40: Ball screw
22: lifting bar
24: lifting block
26: Chain
28: electromagnet
30, 44: guide shaft
32: support bar
34: Weight
42: Transfer block
100: Psalm

Claims (8)

frame;
A fixed support part installed on the frame to fix and support a specimen made of a plated cold rolled steel sheet to be tested;
A lower jig positioned in a surface contact state on the lower surface of the specimen supported by the fixed support;
An elevation driving unit installed on the frame and configured to move up and down by driving a motor;
It is installed on a support bar that moves vertically along a guide shaft installed in the frame, and is detachably fixed to the lifting driving part so that it can be raised together with the lifting driving part. An upper jig hitting the upper surface;
A control unit for controlling the driving of the support bar on which the lifting driving unit and the upper jig are installed;
Including,
On the front side of the fixed support portion, a transfer portion is provided for continuously transferring the specimens hit by the upper jig by a predetermined length in the horizontal direction toward the front side,
The transfer part is a motor driven by the control of the control unit, a ball screw connected to the rotation axis of the motor to rotate in place by driving of the motor, and the tip of the specimen is fixed, and the specimen is fixed to a predetermined length by rotation of the ball screw Consists of a transport block that continuously advances and transports as much as possible.
The elevating driving unit is composed of a ball screw that rotates in place by driving a motor, and an elevating bar that elevates an upper jig located in a descending state to a predetermined height while elevating by the rotation of the ball screw,
The lifting bar is provided with an electromagnet for raising the upper jig and freely falling the elevated upper jig,
The lower jig and the upper jig are cold-rolled steel plate plating quality test devices, each of which is formed with a projection forming portion and a groove forming portion for forming protrusions and grooves in a specimen. delete The method according to claim 1,
The fixing support portion is a cold-rolled steel sheet plating quality test device, characterized in that the clamp is fixed to the front end of the specimen, and a plurality of rollers to be supported by the specimen slide. delete delete The method according to claim 1,
The ball screw and the lifting bar is a cold rolling steel plate plating quality test device, characterized in that made to move up and down along the guide shaft installed in the frame. The method according to claim 1,
Cold-rolled steel plate plating quality test device, characterized in that the support bar is provided with a weight to adjust the impact strength of the specimen. delete

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