KR20090039255A - Apparatus for testing chipping resistance of wheel cover in low temperature - Google Patents

Abstract

An apparatus for testing chipping resistance of a wheel cover in low temperature is provided to obtain exact test data by performing a chipping resistance test of a wheel cover in low temperature inside an environmental chamber which is sealed. An environmental chamber controls the temperature of an internal space. A settling stand is installed in the environmental chamber and a wheel cover as a test target is placed in the settling stand. A rubble outlet(130) is installed at the tip-end part of a rubble transferring part and is equipped with an outlet hole(133) which rubble is put into. The rubble transferring part(140) is horizontally installed at a fixing body part(110) of the environmental chamber, and tansfers rubble to the rubble outlet. An air injection part sprays air at high pressure to the inside of the rubble outlet. A controller controls the drive of the air injection part and the rubble transferring part.

Description

Apparatus for testing chipping resistance of wheel cover in low temperature}

The present invention relates to an apparatus for evaluating low temperature chipping resistance for automobile wheel covers, and more particularly, to evaluate low temperature chipping resistance in an environmental chamber for evaluation of coating properties at low temperature with respect to automotive plastic wheel covers. By the construction, it is possible to carry out the paint property that is vulnerable at low temperatures in the vehicle development stage, and to prevent the paint peeling problem of the wheel cover raised in the field in advance, as well as to implement a better wheel cover coating. A low temperature chipping resistance evaluation for a cover.

In general, in the case of automobile wheel cover, only the chipping resistance test at room temperature is evaluated in the development stage among the items evaluating the durability of the finished coating film.

Here, chipping means that a small object that the car hits while driving, for example, sand, gravel, or dust in the air at the bottom of the road, accelerates while driving and damages the coating film or material. Point out.

As described above, it is difficult to develop a wheel cover that satisfies all the properties under various temperature conditions that can be encountered in the use of a vehicle because the conventional evaluation of chipping resistance at room temperature is difficult. In view of the prominence of, it is necessary to evaluate the chipping resistance at low temperature.

The purpose of the low temperature chipping test is to check the durability of the chipping that can occur in sub-zero winter and to ensure the quality of vehicles exported to cold areas. It is one of the basic physical property evaluations in the evaluation of coating properties.

However, in the past, low temperature evaluation of plastic parts such as wheel covers only performed exposure evaluation at low temperature conditions included in the heat cycle evaluation, and at this stage, the chip was subjected to the chipping of the product because the evaluation conditions were left at low temperature. Physical properties were unknown.

In addition, it is impossible to evaluate the chipping resistance at low temperature using the existing chipping resistance device because the existing chipping resistance device is not equipment that can be installed in the environmental chamber that can create a low temperature environment.

Accordingly, there is a need for new equipment that can be constructed and installed in an environmental chamber to evaluate low temperature chipping resistance for automotive wheel covers.

Therefore, the present invention is invented to solve the above problems, and is configured to perform low temperature chipping resistance evaluation in the environmental chamber for the evaluation of the coating properties at low temperature for the plastic wheel cover for the vehicle, Low temperature resistance for automotive wheel covers, which enables the paint to carry out vulnerable paint properties in the vehicle development stage, prevents the coating peeling problem of wheel covers raised in the field, and enables better wheel cover painting. The purpose is to provide a chipping evaluation device.

In order to achieve the above object, the present invention, the environmental chamber that can control the temperature of the internal space to a high temperature and low temperature to enable the composition of the environment required for chipping resistance evaluation; A cradle provided to mount the wheel cover test object to be evaluated in the environmental chamber; A crushed stone outlet which is installed at the tip of the crushed stone moving part and which crushed stones which can cause chipping to the test article of the cradle fall through the outlet hole; A crushed stone moving part installed horizontally in the fixed body in the environmental chamber to move the crushed stone to the crushed stone outlet installed at the tip end; An air ejecting unit for injecting high pressure air toward the inside of the crushed stone outlet so that the crushed stone moved to the crushed stone outlet is discharged to the test specimen of the cradle through the outlet hole by a strong air pressure action; It provides a low temperature chipping resistance evaluation apparatus for a vehicle wheel cover comprising a; controller for controlling the driving of the crushed stone moving unit and the air injection unit.

In a preferred embodiment, the crushed stone moving portion, the rollers are rotatably installed side by side at a predetermined interval; A sprocket fixed to the roller shaft of each roller; A motor mounted to a rotating shaft and driven and controlled by the controller; A chain connected to the sprocket of each roller shaft and the driving sprocket of the motor to transmit the rotational force of the motor to each roller; Conveyor belt for moving the crushed stone on the upper surface toward the crushed stone outlet while moving by the rotation of the rollers in the state wound on the rollers, wherein the rollers are both ends of the roller shaft is horizontally installed on the fixed body portion It is characterized in that the rotatably coupled to the bracket.

In addition, the conveyor belt is characterized in that the plurality of protrusions are transversely installed at regular intervals along the belt longitudinal direction on the upper surface thereof so that the crushed stone is put into the space partitioned by the protrusions.

In addition, the crushed stone outlet is characterized in that it is installed on the front end of the side wall frame horizontally installed in the fixed body portion along the conveyor belt on both sides thereof.

In addition, the air injection unit, and a pneumatic pump for providing high pressure air; An air pipe connected to the pneumatic pump to supply the high pressure air provided by the pneumatic pump, and having an air discharge port at an end thereof facing the crushed stone discharge port; And a pneumatic valve installed in the middle of the air pipe to control the supply of high pressure air through the air pipe by opening and closing the controller under the control of the controller.

According to the low-temperature chipping resistance evaluation device for automobile wheel cover of the present invention having the above characteristics, to evaluate the low-temperature chipping resistance evaluation in the environmental chamber for the evaluation of the coating properties at low temperature with respect to the automotive plastic wheel cover In this way, it is possible to perform the paint properties that are vulnerable at low temperatures in the vehicle development stage, to prevent the paint peeling problem of the conventional wheel cover raised in the field in advance, as well as to implement a better wheel cover coating It works.

In particular, the evaluation apparatus of the present invention is to provide a vehicle that can be evaluated in consideration of the complex environmental factors actually encountered in the use of the vehicle, the crushed stone moving unit provided in the device in conjunction with the heat-resistant cycle evaluation to move the crushed stone at each low temperature step By the post-injection, the low temperature chipping of the EUT is automatically performed, and the accurate low temperature chipping resistance evaluation is performed inside the enclosed environmental chamber, thereby contributing to the improvement of the reliability of the evaluation data.

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

1 is a block diagram illustrating a chipping resistance evaluation apparatus according to the present invention, Figure 2 is a view for explaining an evaluation method using the chipping resistance evaluation apparatus according to the present invention.

The chipping resistance evaluation apparatus according to the present invention includes an environmental chamber 100 capable of controlling the temperature of the internal space to a high temperature and a low temperature so as to enable the composition of the environment required for the chipping resistance evaluation; A cradle 120 provided to mount the wheel cover test article 1 to be evaluated within the environmental chamber 100; A crushed stone outlet 130 installed at the front end of the crushed stone moving part 140 and causing crushed stone to be chipped into the test article 1 of the holder 120 through the outlet hole 133; A crushed stone moving part 140 installed horizontally in the fixed body part 110 in the environmental chamber 100 to move the crushed stone to the crushed stone outlet 130 installed at the tip end; An air injection unit 150 for injecting high pressure air toward the inside of the crushed stone outlet 130 so that the crushed stone moved to the crushed stone outlet 130 is discharged by the strong pneumatic action to the test article 1 of the holder 120; ; And a controller 111 for controlling the driving of the crushed stone moving unit 140 and the air injection unit 150.

First, the test sample holder 120, the crushed stone outlet 130, the crushed stone moving unit 140, the air injection unit 150, the crushed stone outlet 130, crushed stone moving unit 140, air injection unit 150 And the fixed body unit 110 on which the controller 111 is installed is sized and installed so as to be installed in the internal space of the environmental chamber 100 for high temperature and low temperature environment composition.

In the present invention, the environmental chamber 100 is a chamber provided to control the temperature of the internal space at a high temperature and a low temperature, and a general test chamber for controlling the temperature of the internal space in a wide temperature range may be used.

In addition, the holder 120 is provided to be fixed to the wheel cover test article (hereinafter, abbreviated as a test article) 1 on the bottom side of the environmental chamber 100, the crushed stone outlet 130 is a crushed stone moving part ( The crushed stone moved on the conveyor belt 146 is integrally formed at the distal end of the side wall frame 141 horizontally horizontally mounted to the fixed body 110 so as to be positioned at both sides thereof along the conveyor belt 146 of the 140. Sidewalls 131 integrally formed on the sidewall frame 141 and squarely disposed on the sidewall frame 141 and bottom surfaces 132 integrally formed on the sidewall 131 so that they can be introduced into the lower test article 1. ), It has a structure having an outlet hole 133 formed in the center of the bottom portion 132 to allow the crushed stone to be discharged.

Here, the crushed stone refers to a small piece of stone that is dropped down to cause chipping on the painted surface of the plastic test piece (1).

In addition, the crushed stone moving unit 140 is a component that moves the crushed stone to the crushed stone outlet 130 while the drive is controlled under the control of the controller 111, in the present invention, the crushed stone moving unit 140 is an environmental chamber 100 It can be implemented as a conveyor transporting system installed horizontally in the fixed body 110 in the).

Attached Figure 3 is a plan view showing an example of the crushed stone moving unit in the evaluation apparatus according to the present invention, the rollers 142 are installed to be rotated side by side at a predetermined interval, fixedly mounted on the roller shaft of each roller 142 Sprocket 143a, a motor 144 equipped with a drive sprocket 144a on a rotating shaft, a sprocket 143a of each roller shaft and a drive sprocket 144a of the motor 144 are installed and connected to a motor 144 It is configured to include a chain (145) for transmitting the rotational force of each roller (142).

Here, the motor 144 is driven under the control of the controller 111, and is fixedly mounted to the fixed body unit 110 by the bracket 148, and the motor 144 under the control of the controller 111. ) Is driven, the drive sprocket 144a of the rotating shaft is rotated, and the chain 145 is driven so that the sprocket 143a of each roller shaft is driven to rotate at the same time.

At this time, while the sprocket 143a of each roller shaft is rotated by receiving the rotational force of the motor 144 through the chain 145, all the rollers 142 of the conveyor transport system are driven to rotate at the same time, wound on the roller 142 Jin conveyor belt 146 is to be moved.

The rollers 142 are supported in a state in which the roller shafts at both ends are rotatably coupled to the bracket 149 horizontally installed on the fixed body 110, and are arranged side by side at a predetermined interval, and one side of each roller 142. The sprocket 143a is fixedly installed on the roller shaft installed at the end, and the conveyor belt 146 is wound around the entire rollers 142.

A plurality of protrusion plates 147 are horizontally installed on the upper surface of the conveyor belt 146 at predetermined intervals along the belt length direction, and a predetermined amount of crushed stone 2 is inserted between each protrusion plate 147 to move the controller. As the 111 controls the driving of the motor 144, the conveyor belt 146 driven by the rotational force of the motor 144 moves the crushed stones 2 into the crushed stone outlet 130 while moving stepwise by a predetermined distance every one heat cycle. Will be moved toward.

In addition, the crushed stone 2 moved toward the crushed stone outlet 130 on the conveyor belt 146 is finally able to be introduced into the crushed stone outlet 130 as the protrusion plate 147 pushes the crushed stone.

On the other hand, the air injection unit 150 is configured to provide a high pressure air through the air pipe 152, a pneumatic pump 151 for making and providing high pressure air, the high pressure provided by the pneumatic pump 151 It is configured to include an air pipe 152 is supplied with air, a pneumatic valve 154 is installed in the middle of the air pipe 152.

The air pipe 152 is installed so that the air discharge port 153 of the end portion thereof through the fixed body portion 110 toward the crushed stone discharge port 130 from the upper side of the crushed stone discharge port 130, the air discharge port 153 The high pressure air is injected downward through the bar, the high pressure air injected from the air discharge port 153 is to be sprayed toward the crushed stone (2) loaded on the bottom portion 132 of the crushed stone outlet 130, the crushed stone outlet When the high pressure air is blown out by the crushed stone of 130, the crushed stone is discharged by the air pressure through the outlet hole 133 of the crushed stone outlet 130, and is blown onto the surface of the lower specimen 1.

The crushed stone (2) is discharged from the outlet hole 133 of the crushed stone outlet 130 is to hit the test piece (1) of the cradle 120 located directly below to cause chipping.

The pneumatic valve 154 is opened and closed under the control of the controller 111 to be installed to interrupt the high pressure air of the air pipe 152 provided by the pneumatic pump 151, the controller 111 is a stone By driving the eastern 140 to move the crushed stone loaded on the conveyor belt 146 step by step into the crushed stone outlet 130, and then open the pneumatic valve 154 for a predetermined time to pressurize the high pressure air By the spout to the crushed stone outlet 130 through the air discharge port 153 of the air pipe 152, the crushed stone first put into the crushed stone outlet 130 through the outlet hole 133 wheel cover test article It is to be put in (1).

As described above, the configuration of the chipping resistance evaluation device according to the present invention has been described. Hereinafter, the process of evaluating the wheel cover test article using the chipping resistance evaluation device of the present invention will be described. same.

Wheel cover chipping resistance evaluation process using the evaluation apparatus of the present invention -40 ℃ after the environmental chamber 100 to raise the temperature of the interior space to 80 ℃ in order to give more severe environmental conditions for the specimen (1) Lowering to evaluate the chipping resistance of the wheel cover.

That is, the environmental chamber 100 once raises the test product temperature to 80 ° C., and then inputs the crushed stone to the test product 1 while lowering the temperature to −40 ° C.

In addition, this process is repeated three times for one specimen (1) and compared with a predetermined target value to finally evaluate the chipping resistance.

As described above, when a predetermined harsh temperature condition, that is, the temperature of the test product is raised to a high temperature, and then the crushed stone is introduced into a low temperature state, a total of 3 heat resistant cycles are repeatedly performed on one test product (1). The chipping resistance is evaluated.

When explaining the evaluation process using the evaluation apparatus of the present invention in detail step by step, first, the wheel cover test article 1 to be evaluated is fixed to the cradle 120 in the environmental chamber 100.

Then, 50 g of crushed stone, that is, crushed stone (small pieces of stone), is filled in each compartment partitioned by the protrusion plate 147 on the conveyor belt 146 of the crushed stone moving part 140. In the illustrated example, the conveyor belt 146 is filled. Four bars divided by the protrusion plate 147 are provided on the bar), and 50 g of crushed stone 2 is filled in each cell, and one cell of crushed stone 2 is put in each heat-resistant cycle.

In the state in which the crushed stone 2 is filled as described above, the test chamber 1 fixed to the holder 120 is maintained at 80 ° C. by raising the internal space of the environment chamber 100 to 80 ° C., and then The internal space is cooled to -40 ° C to maintain the specimen 1 at -40 ° C.

As such, when the environmental chamber 100 reaches a low temperature, the controller 111 drives the motor 144 of the crushed stone moving part 140, and the conveyor belt 146 of the crushed stone moving part 140 moves to the crushed stone outlet. When moving one compartment to 130, the crushed stones 2 filled in the end compartment of the conveyor belt 146 are introduced into the crushed stone outlet 130.

In this state, the controller 111 opens the pneumatic valve 154 of the air injection unit 150 so that a high pressure air of a constant pressure generated by the pneumatic pump 151 opens the air outlet 153 of the air pipe 152. It is injected to the lower crushed stone outlet 130 through, and at this time, the high-pressure air injected downward pushes the crushed stone 2 loaded on the crushed stone outlet 130 strongly and opens the exit hole 133 of the crushed stone outlet 130 The discharged downward through the bar, the crushed stone (2) discharged through the outlet hole 133 of the crushed stone outlet 130 hits the surface of the specimen (1) to cause chipping.

Thus, the process of making the test article 1 to a high temperature, cooling to a low temperature, moving the crushed stone 2 and adding it, and injecting the crushed stone into the test product 1 by injecting high pressure air in total 3 Repeatedly performed, the chipping resistance evaluation is performed on the specimen (1) that has completed this repeated implementation.

In this way, the evaluation apparatus according to the present invention can be used to solve the problem of peeling off the wheel cover paint at low temperature, which is a condition that is vulnerable to plastic coating among various temperature conditions encountered by the consumer in the use of automobiles and to improve the coating properties. Therefore, the existing room temperature chipping resistance evaluation and environmental resistance evaluation can be performed at the same time, so that the reproducibility confirmation evaluation at the development stage closer to the cause of the field problem can be performed.

In addition, it is configured to operate automatically when a predetermined time by breaking the manual method of manually inputting the crushed stone as in the prior art, so that the evaluation can be made automatically in conjunction with the time of the heat-resistant cycle evaluation, thereby In addition to increasing work convenience, it is possible to provide an effect of eliminating the influence of the external environment by opening and closing the chamber during manual evaluation.

In particular, the evaluation device of the present invention is to provide a vehicle that can be evaluated in consideration of the complex environmental factors actually encountered in the use of the vehicle, the crushed stone moving unit provided in the device moves the crushed stone at each low temperature step in conjunction with the heat cycle evaluation By the post-injection, the low temperature chipping of the EUT is automatically performed, and the accurate low temperature chipping resistance evaluation is performed inside the enclosed environmental chamber, thereby contributing to the improvement of the reliability of the evaluation data.

1 is a block diagram showing a chipping resistance evaluation apparatus according to the present invention,

2 is a view for explaining an evaluation method using the chipping resistance evaluation apparatus according to the present invention,

Figure 3 is a plan view showing an example of the crushed stone moving unit in the evaluation apparatus according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: environmental chamber 110: fixed body

120: cradle 130: crushed stone outlet

140: crushed stone moving unit 150: air injection unit

Claims (5)

An environmental chamber 100 capable of controlling the temperature of the internal space to a high temperature and a low temperature so as to enable an environment for chipping resistance evaluation; A cradle 120 provided to mount the wheel cover test article 1 to be evaluated within the environmental chamber 100; The crushed stone outlets 130 are installed at the front end of the crushed stone moving part 140, and the crushed stones 2 which may cause chipping to the test article 1 of the cradle 120 are dropped and introduced through the outlet hole 133. ; A crushed stone moving part (140) installed horizontally in the fixed body part (110) in the environmental chamber (100) for moving the crushed stones (2) to the crushed stone outlet (130); High-pressure air toward the inside of the crushed stone outlet 130 so that the crushed stone (2) moved to the crushed stone outlet 130 is discharged to the test article 1 of the cradle 120 through the outlet hole 133 by a strong pneumatic action An air injection unit 150 for spraying; A controller 111 for controlling driving of the crushed stone moving part 140 and the air injection part 150; Low temperature chipping resistance evaluation device for a vehicle wheel cover comprising a. The method according to claim 1, The crushed stone moving unit 140, Rollers 142 rotatably installed side by side at regular intervals; A sprocket 143a fixed to the roller shaft of each of the rollers 142; A motor 144 mounted on a rotating shaft and driven and controlled by the controller 111; A chain 145 connected to the sprocket 143a of each roller shaft and the driving sprocket 144a of the motor 144 to transmit rotational force of the motor 144 to each roller 142; Conveyor belt 146 for moving the crushed stone (2) on the upper surface while moving by the rotation of the roller 142 in the wound state on the roller 142 toward the crushed stone outlet (130); It is configured to include, wherein the roller 142 is a cold end chipping for the automobile wheel cover, characterized in that the roller shaft of both ends are rotatably coupled to the bracket 149 horizontally installed on the fixed body portion 110 Sex rating device. The method according to claim 2, The conveyor belt 146 has a plurality of protrusions 147 are horizontally installed at a predetermined interval along the belt longitudinal direction on the upper surface thereof so that the crushed stones 2 can be moved in the space partitioned by the protrusions 147. Low temperature chipping resistance evaluation device for an automobile wheel cover, characterized in that. The method according to claim 2, Low temperature crushed stone outlet 130 is installed on the front end of the side wall frame 141 horizontally installed on the fixed body portion 110 so as to be located on both sides along the conveyor belt 146. Chipping resistance evaluation device. The method according to claim 1, The air injection unit 150, A pneumatic pump 151 for making and providing high pressure air; An air pipe 152 connected to the pneumatic pump 151 so as to supply the high pressure air provided by the pneumatic pump 151 and having an air discharge port 153 toward the inside of the crushed stone discharge port 130; A pneumatic valve (154) installed in the middle of the air pipe (152) to control the supply of high pressure air through the air pipe (152) by opening and closing the control of the controller (111); Low temperature chipping resistance evaluation device for a vehicle wheel cover, characterized in that comprises a.

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