WO2010134687A9

WO2010134687A9 - Device for measuring thickness of tear line on vehicle airbag cover

Info

Publication number: WO2010134687A9
Application number: PCT/KR2010/001628
Authority: WO
Inventors: 황진성; 황보성
Original assignee: Hwang Jinsung; Hwang Bosung
Priority date: 2009-05-18
Filing date: 2010-03-16
Publication date: 2011-01-13
Also published as: WO2010134687A3; WO2010134687A2; KR100925525B1

Abstract

The present invention relates to a device for measuring the thickness of a tear line on a vehicle airbag cover, which includes a work stage provided with a work table for measuring the thickness of the tear line on the airbag cover of a vehicle crash pad, the device comprising: a fixing means which is disposed on said work table for securing said crash pad thereon; a movable means which is disposed between said work table and said fixing means and can move along the X- and Y-axes for measuring the thickness of the tear line of said crash pad; a measuring means for measuring the thickness of the tear line of said crash pad using a pair of laser sensors; and a control means for indicating the numerical value of the thickness of the tear line measured by said measuring means, controlling said measuring means for measuring the thickness of the tear line of said secured crash pad, and controlling the movement of said movable means for measuring said tear line. The use of laser radiation of the laser sensors for measuring remaining thicknesses of respective sections of the tear line formed on the air bag cover of the crash pad enables accurate determination as to whether or not products are defective, and consequently enables installation of non-defective products in a vehicle and smooth deployment of the airbag, thereby improving the driver's safety.

Description

Tearline thickness measuring device for automotive airbag cover

The present invention relates to a tear line of an airbag cover, and more particularly, to determine the good and defective parts by clearly inspecting the remaining thickness for each section of the tear line formed on the airbag cover that is broken in the process of deploying the airbag. In addition, the present invention relates to a tear line thickness measuring apparatus for an airbag cover for a vehicle, which prevents defective products from being mounted on a vehicle, thereby facilitating deployment of the airbag during a collision of the vehicle.

In general, a vehicle is provided with a variety of devices for the safety of the occupant, the steering wheel (steering wheel) is equipped with an air bag (air bag) is a safety aid for automobiles to prevent the driver from being severely impacted in the event of a vehicle accident.

Recently, as the performance of the vehicle is improved and the pavement of the road is improved, the driving speed of the vehicle is gradually increased, and as a result, the collision of the vehicle occurs, and the human injury is increasing.

The car is equipped with airbags at each of three places on the steering wheel, the passenger seat, two knees, four seats, and the glass fixing pillars on both sides.

Therefore, in addition to the driver, passengers are also protected by airbags.

For example, in the case of a passenger air bag for protecting a passenger sitting in the passenger seat, a crash pad disposed in front of the passenger seat is formed integrally with the crash pad and is provided with an airbag cover of a soft material manufactured by plastic injection molding. The airbag is interposed therein to break the airbag cover during shock and sudden stop of the vehicle to deploy the airbag.

In this case, a tear line is preformed in the airbag cover to facilitate tearing due to the instantaneous deployment force of the airbag. In this case, the tear line should be formed with I- or V-grooves which are end milled on the inner side along the route to be broken so that the airbag cover is collapsed due to the collision of the car, and should not be exposed on the outer side. .

Therefore, the deployment pressure of the airbag according to the collision of the vehicle is transmitted to the weakest part of the tear line formed in the airbag cover, thereby breaking the tear line.

In this case, as the airbag cover is flipped over, the airbag is deployed in an inflated state to protect the driver from impact.

As described above, the tear line formed in the air bag cover must have a residual thickness different for each section of the tear line so as to break gradually by the deployment pressure of the air bag when the air bag is deployed. This means that when the remaining thickness of each section of the tear line is generally thick, the deployment pressure of the air bag is generated at the same time, so that the tear line is not broken and the air bag is not deployed. This is because the airbag cover bounces toward the passenger seat as it breaks, causing a bigger human accident.

Therefore, the tear line of the airbag cover must be safety check whether the remaining thickness of each section is formed uniformly.

In general, the inspection method of the tear line of the airbag cover is composed of a sampling inspection method according to mass production quantity. For example, the remaining thickness of each section is cut by cross-sectional cutting of 5 to 10 samples among 100 production products. The inspection is done by direct measurement.

However, such a method has a problem that a clear inspection is not performed because practically all mass production products are not inspected.

In the sampling inspection method above, the mass-produced product is cut into sections according to the location of the remaining thickness of each section of the tear line, and the inspection is performed. As the shape of is pushed down, a change occurs, which causes the error that the measurer judges a good product as bad, thus causing a problem of discarding the entire product produced in the corresponding line.

In addition, as the material of the crash pad is soft in the process of measuring the cross-sectional cut sample, there is a problem in that it is difficult to accurately check the remaining thickness as the tear line is pressed by the pressing force of the measuring device.

The present invention was devised to solve the above problems and technical biases, the tear line thickness measuring apparatus of the airbag cover for automobiles that can measure the remaining thickness of each section of the tear line in the non-destructive state of all crash pads produced The purpose is to provide.

The apparatus for measuring the tear line thickness of an airbag cover for a vehicle for achieving the above object of the present invention includes a work stage provided with a work table for measuring the thickness of the tear line processed in the airbag cover of the vehicle crash pad. An apparatus for measuring a tear line thickness of an airbag cover, the apparatus comprising: a fixing unit positioned at an upper portion of the work table so that the crash pad is seated and fixed; A conveying means provided between the work table and the fixing means to be transported to the X axis and the Y side for measuring the tear line thickness of the crash pad; Measuring means for measuring a thickness of the processed tear line of the crash pad using a pair of laser sensors; Displaying the result value according to the numerical information on the thickness of the tear line measured by the measuring means, and controls the measuring means for measuring the tear line thickness of the fixed crash pad, the measurement for the tear line measurement It characterized in that it comprises a control means for controlling the transfer of the conveying means.

As one example, the fixing means is formed with one or more jigs for seating different crash pads according to the vehicle type, and each jig is in close contact with the surface of the crash pad to maintain the seated state of the crash pad. Adsorption port for adsorbing the crash pad is provided on one side of the jig on which the tear line of the crash pad is seated, the fixing part is provided with a clamp for pressing the crash pad to prevent vibration of the crash pad during transfer of the work stage Characterized in that it comprises a.

As one example, the transfer means, the X-axis working stage; Y-axis work stage; A driving motor provided in the X and Y axis directions, respectively; A shaft axially coupled to each of the driving motors and rotating by a driving force of the driving motors; And a moving block fitted to the shaft while being fixed to the X and Y axis work stages to move the X and Y axis work stages through rotation of the shaft.

As an example, the transfer means is characterized in that the transfer in a zigzag alternating X, Y axis across the tare line processed in the airbag cover.

As one example, the measuring means, the transfer bracket is provided to be transportable in the Y axis in front of the work stage; And a laser irradiation unit for irradiating a laser to the tear line, and a light receiving unit for receiving a laser reflected from the tear line, and is installed to face vertically through the transfer bracket with the X and Y axis work stages interposed therebetween. A pair of laser sensors measuring a thickness of a tear line by irradiating a laser on the top and bottom of the tear line; And a stepping motor installed on the transfer bracket such that the laser sensor installed on the upper portion of the pair of laser sensors is capable of horizontal rotation.

As one example, the control means, the key input unit; A display unit displaying thickness information and a measurement result value of the airbag forming unit including a tear line; A transmitter / receiver for receiving information on the thickness of the tear line measured by the pair of laser sensors and transmitting operation control signals of the transfer means and the transfer bracket through the key input unit; A storage unit configured to store information about the measured tear line thickness and to store reference thickness information of a tear line of a crash pad according to a vehicle type and a program for performing a measurement operation; And receiving thickness information of the airbag forming unit measured from a pair of laser sensors provided at the upper and lower portions of the crash pad through the transceiver, and calculating a value having the smallest distance difference among the upper and lower data to obtain the thickness information of the tear line. And a control unit controlling to be extracted and controlling the extracted information to be displayed through the display unit in numerical and graphical form.

As an example, the apparatus may further include a wired / wireless communication unit for wired / wireless communication with an external PC for managing settings or data.

According to the tear line thickness measuring apparatus of the airbag cover for a vehicle of the present invention having the above configuration, the inspection method of the remaining thickness of each section of the tear line formed on the airbag cover of the crash pad is made by laser irradiation of the laser sensor. According to this, the judgment on the good quality and the defect becomes clear, and thus, the good quality is mounted on the vehicle to facilitate the deployment of the airbag, and there is an advantage that the driver's safety is promoted.

In addition, since the non-destructive inspection of the crash pad by the laser sensor is performed, the cost of material waste is reduced, and the inspection time for the excessive demand of the inspection time according to the conventional inspection method is quickly performed.

1 is a perspective view of a tear line thickness measuring apparatus of a vehicle airbag cover according to a preferred embodiment of the present invention.

Figure 2 is a perspective view showing the fixing means of the tear line thickness measuring apparatus of a vehicle airbag cover according to an embodiment of the present invention.

3 is a plan view of the crash pad is seated on the fixing means of the tear line thickness measuring apparatus of the airbag cover for a vehicle according to an embodiment of the present invention.

Figure 4 is a left side view of the crash pad is seated on the fixing means of the tear line thickness measuring apparatus of the vehicle airbag cover according to an embodiment of the present invention.

5 is a perspective view showing an X, Y axis working stage according to a preferred embodiment of the present invention.

Figure 6 is a right side view of the tear line thickness measuring apparatus of the airbag cover for a vehicle according to an embodiment of the present invention.

Figure 7 is a front view of the tear line thickness measuring apparatus of the airbag cover for a vehicle according to an embodiment of the present invention.

Figure 8 is a perspective view of the measuring means of the tear line thickness measuring apparatus of a vehicle airbag cover according to an embodiment of the present invention.

9 is a view showing a path for the laser sensor to measure the tear line according to an embodiment of the present invention.

10 is a view showing a position in which the laser sensor senses in accordance with a preferred embodiment of the present invention to extract the measured value.

11 is a perspective view showing a CCD displacement sensor applied to a preferred embodiment of the present invention.

12 is a view showing a measuring method of a laser sensor according to an embodiment of the present invention.

Figure 13 is a block diagram showing the configuration of a control means according to an embodiment of the present invention.

14 is a diagram illustrating measured tear line thickness information displayed on a display unit according to an exemplary embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 14.

It is to be noted that the respective components described below are referred to as "first", "second" and / or "third", not merely to limit each component. Thus, "first", "second" and / or "third" are used either selectively or interchangeably for each component.

Referring to FIG. 1, a tear line thickness measuring apparatus 1 includes a work table 85 for measuring a thickness of a tear line 44 shown below processed in an airbag cover of an automobile crash pad 42. In the tear line 44 thickness measuring apparatus 1 of the airbag cover for a vehicle including a work stage 90 provided, it is located on the work table 85 so that the crash pad 42 is seated and fixed. It is provided between the fixing means 10 and the work table 85 and the fixing means 10 to be transported to the X-axis and Y-side for measuring the thickness of the tear line 44 of the crash pad 42. Measuring means 200 and the measuring means for measuring the thickness of the processed tear line 44 of the crash pad 42 using the transfer means 70 and a pair of laser sensors (210, 230) below Numerical information on the thickness of the tear line 44 measured through (200) Display the result value according to the control means 200 for measuring the thickness of the tear line 44 of the fixed crash pad, and control of the conveying means 70 for conveying the tear line 44 Control means 300 for controlling the configuration is included.

Figure 2 is a perspective view showing a fixing means of the tear line thickness measuring apparatus of the airbag cover for a vehicle according to an embodiment of the present invention.

Referring to FIG. 2, the fixing means 10 includes one or

more jigs

11, 12, 13, 14, 15, and 16 for seating different crash pads 42 according to the vehicle type, and each of the jigs. 11, 12, 13, 14, 15, and 16 are fixed to the following fixing part 30, the crash in a position in close contact with the surface of the crash pad 42 so that the seated state of the crash pad 42 is maintained. One or

more suction holes

17, 18, 19, 20, 21, and 22 for adsorbing the pads 42 are provided, and the

jigs

11, 12, and 13 on which the tear lines 44 of the crash pads 42 are seated. One side of the, 14, 15, 16 is composed of a fixing part 30 is provided with a clamp 23 for pressing the crash pad 42 to prevent the vibration of the crash pad 42 during transfer of the work stage, In accordance with the crash pad 42 according to the vehicle type is replaced with different fixing means (10).

That is, the fixing means 10 can be separated from the Y-axis work stage, and can be replaced with a new fixing means 10 that fits the seated crash pad 42.

3 is a plan view of the crash pad is seated on the fixing means of the device for measuring the tear line thickness of the airbag cover for a vehicle according to a preferred embodiment of the present invention, Figure 4 is a tare of the airbag cover for a vehicle according to a preferred embodiment of the present invention A left side view of a crash pad seated on a fixing means of a line thickness measuring device.

3 and 4, the crash pad 42 is seated on each jig (11, 12, 13, 14, 15, 16) and the suction port (17, 18, 19, 20, 21, 22) and clamp When pressed and fixed by 23, the upper and lower portions of the airbag forming portion 46 including the tear line 44 are open for measurement.

As shown, it can be seen that the clamp 23 is formed on one side of the jig 11 on which the airbag forming unit 46 is seated.

5 is a perspective view showing an X, Y axis work stage according to a preferred embodiment of the present invention, Figure 6 is a right side view of the tear line thickness measuring apparatus of the airbag cover for a vehicle according to a preferred embodiment of the present invention, Figure 7 Is a front view of a tear line thickness measuring apparatus of an airbag cover for a vehicle according to a preferred embodiment of the present invention.

5 to 7, the X-axis work stage 80 is provided with one or

more LMs

92 and 93, and is movable in the X-axis, and the Y-axis work stage 50 also includes one or more LMs 94. Since it is provided to be movable on the Y-axis, the measuring means 200 can move along the tear line 44 and measure the thickness.

Coupling

portions

51, 52, 53, 54, 55, and 56 for fixing the fixing means 10 are provided on the Y-axis work stage 50.

In the center of the X-axis working stage 80 and the Y-axis working stage 50, the

drive motors

100 and 110 and the

drive motors

100 and 110 provided in the X and Y-axis directions, respectively, are axially coupled to the

drive motors

100 and 110. X-axis through the rotation of the shaft (111,112) is fitted to the shaft (111,112) in a state fixed to the respective shaft (111,112) and the X-axis and Y-axis working stage (80,50) rotated by the driving force of One or more moving blocks 114 are provided to move the Y-axis work stages 80 and 50.

Referring to FIG. 8, the measuring means 200 includes a

laser beam radiator

212 and 232 irradiating a laser to the tear line 44 and the transfer bracket 240 installed to be transported in the Y axis in front of the work stage. And each of the

light receiving units

214 and 234 for receiving the laser beam reflected from the tear line 44 and vertically through the transfer bracket 240 with the X and Y axis work stages 80 and 50 interposed therebetween. A pair of

laser sensors

210 and 230 are installed to face each other to measure the thickness of the tear line 44 by irradiating a laser on the top and bottom of the tear line 44.

In addition, the first laser sensor 210 installed on the upper portion of the pair of laser sensors (210, 230) includes a stepping motor 236 installed on the transfer bracket 240 to enable horizontal rotation.

The stepping motor 236 is provided because when the light irradiated from the laser irradiation unit 212 is incident on the light receiving unit 214, since the triangulation method described below is used, the curved surface has a When measuring the thickness of the line, when the light is not incident on the light receiving unit 214 is to enable the incident by rotating horizontally.

9 is a view illustrating a path in which a laser sensor measures a tear line according to an exemplary embodiment of the present invention.

The tear line 44 may be divided into four sections, and each residual thickness is different.

The lower surface of the tear line shown in FIG. 5 has a residual thickness of 1.1 in order to be first broken, and both wing portions of the lower portion 1.3, the upper side and the section including the wing portion 1.5, both sides except a certain space of the upper portion The interval will have a residual thickness of 2.0.

The residual thickness is a numerical value according to an embodiment, and the residual thickness of each section according to the vehicle model is changed.

Each wing part is formed in the state spaced about 5-10 mm.

A pair of

laser sensors

210 and 230 inspect the thickness of the tear line 44 in a zigzag manner, and sets 15 places to start the inspection.

Of course, since the crash pads vary depending on the vehicle type, the measurement interval may vary for each type.

10 is a view illustrating a position where a laser sensor senses and extracts a measured value according to an exemplary embodiment of the present invention.

Referring to FIG. 10, when a pair of

laser sensors

210 and 230 provided at upper and lower portions of the tear line 44 reach a set measurement position, the scanned data is scanned in the A-E direction to transmit the scanned data.

11 is a perspective view illustrating a CCD displacement sensor applied to a preferred embodiment of the present invention.

Referring to Figure 11, the CCD (pixel) laser displacement sensor applied to the present invention, a triangular measurement method is used.

Generally, a PSD (light position detecting element) is used as a light receiving element, but in the present invention, a CCD is used as the light receiving element.

Light reflected by the object passes through the light receiving lens to form spots on the PSD or CCD.

In the PSD method, the center of the spot is determined by using the light quantity distribution of the entire spot of the PSD, and it is recognized as the position of the object.

At this time, the light quantity distribution causes a change in the measured value due to the influence of the surface state of the object.

However, the CCD method detects a pixel in which the peak value of the spot light amount distribution is recognized as the position of the object.

Thus, the CCD can obtain stable high accuracy results regardless of the spot light distribution.

Referring to FIG. 12, when a pair of

laser sensors

210 and 230 provided at the upper and lower portions of the tear line 44 reach the measurement position, every 0.01 mm interval at high speed (about 100 to 2000 times per second) in the width direction is performed. The distances D-1 and D-2 are measured and the data are transmitted to a computer to calculate a value t1 having the smallest distance difference among the upper and lower data.

For example, if D = 100 and D-1 = 48.7, D-2 = 49.8, and slope = 25 degrees,

t = Cos25x {100- (48.749.8)} = 1.35946 (measurement thickness t = Cos0xt1).

13 is a block diagram showing the configuration of a control means according to an embodiment of the present invention.

Referring to FIG. 13, the control unit 300 includes a display unit 320 displaying thickness information and measurement result values of the airbag forming unit 46 including the key input unit 316 and the tear line 44. Receives information about the thickness of the tear line 44 measured by the pair of

laser sensors

210 and 230, and receives the operation control signals of the transfer means 70 and the transfer bracket 240 through the key input unit 316. Transmitting and receiving unit 312 for transmission and information on the measured tear line 44 thickness is stored, for performing the reference thickness information and measurement operation of the tear line 44 of the crash pad 42 according to the vehicle type Thickness information of the airbag forming unit 46 measured from a pair of

laser sensors

210 and 230 provided above and below the crash pad 42 through the storage unit 314 and the transceiver unit 312 storing the program. Is input and the smallest distance difference among upper and lower data is calculated. Is configured to contain the control information is extracted so that the thickness information of the tear line 44 is extracted as a numerical value and graph format, the controller 318 controls to display through the display unit 320.

In addition, a wired or wireless communication unit 322 for wired or wireless communication with an external PC (330) for managing settings or data is further configured.

Referring to FIG. 14, the X and Y coordinates 351 and 352 that are currently measured are displayed on the display 320, and the upper measurement data 362 and the lower measurement data 364 are displayed on the graph 360.

As shown, the interval indicated by the dotted line is measured as the minimum interval, and the final value is output according to the calculation of the product slope constant.

The tear line thickness measuring apparatus 1 according to the present invention has been described as an embodiment of the configuration and method for measuring the remaining thickness of the tear line 44 of the airbag cover provided in the crash pad 42, Since the airbags may be provided at each of three positions at the handle, the passenger seat, the two knees, the four seats, and the two sides of the glass fixing pillars, the jig may be formed according to the shape of the pad including the airbag cover having the respective tear lines. By reconfiguring and deforming the fixing means 10, measuring the thickness of all the tear lines formed in the vehicle is a configuration that can be obviously derived from the description of the embodiment of the present invention.

In addition, it is obvious that it can also be used as a device for measuring the remaining thickness for all industrial devices or articles that can be seated on the fixing means (10).

On the other hand, the present invention has been described an embodiment for measuring the residual thickness through the movement of the measuring means 200 and the X-axis and Y-axis working stage (80,50), but those skilled in the art fixed X-axis and Y Obviously, it is possible to derive a configuration for measuring the remaining thickness through the configuration of the shaft work stages 80 and 50 and the movable measuring means 200.

The above description has been described as an example by the embodiment of the present invention, but is not limited to the above-described embodiment and those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. . Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description in the specification but should be defined by the claims.

Claims

A device for measuring the thickness of a tare line of an airbag cover for a vehicle, including a work stage provided with a worktable for measuring the thickness of the tare line processed on the airbag cover of the car crash pad.

A fixing means positioned on the work table so that the crash pad is seated and fixed;

A conveying means provided between the work table and the fixing means to be conveyed to the X-axis and the Y-side for measuring the tear line thickness of the crash pad;

Measuring means for measuring a thickness of the processed tear line of the crash pad using a pair of laser sensors;

Displaying a result value according to the numerical information on the thickness of the tear line measured by the measuring means, and controls the measuring means for measuring the tear line thickness of the fixed crash pad, the measurement for the tear line measurement Control means for controlling the transport of the transport means; including,

The fixing means,

One or more jigs for seating different crash pads are formed according to the vehicle type, and each jig has an adsorption port for adsorbing the crash pads in close contact with the surface of the crash pads to maintain the seated state of the crash pads. It is provided, one side of the jig on which the tear line of the crash pad is mounted, characterized in that it comprises a fixing portion provided with a clamp for pressing the crash pad to prevent the vibration of the crash pad during transfer of the work stage Tearline thickness measuring device for airbag cover.
The method of claim 1,

The transfer means,

X-axis work stage;

Y-axis work stage;

A driving motor provided in the X and Y axis directions, respectively;

A shaft axially coupled to each of the driving motors and rotating by a driving force of the driving motors; And

Tearline thickness of the vehicle airbag cover comprising a; moving block which is fixed to the X-axis and Y-axis work stage is inserted into the shaft to move the X-axis and Y-axis work stage through the rotation of the shaft; Measuring device.
The method according to claim 1 or 2,

The conveying means is a tear line thickness measuring apparatus for an airbag cover for a vehicle, characterized in that conveyed in a zigzag while alternating the X, Y axis across the tare line processed in the airbag cover.
The method of claim 1,

The measuring means,

A transfer bracket installed to the Y axis in front of the work stage;

And a laser irradiation unit for irradiating a laser to the tear line, and a light receiving unit for receiving a laser reflected from the tear line, and is installed to face vertically through the transfer bracket with the X and Y axis work stages interposed therebetween. A pair of laser sensors that measure the thickness of the tear line by irradiating a laser on the top and bottom of the tear line; And

Tearline thickness measuring apparatus of the airbag cover for a vehicle, characterized in that it comprises a stepping motor installed on the conveying bracket so that the laser sensor installed on the upper of the pair of the laser sensor to the horizontal rotation.
The method according to claim 1 or 4,

The pair of laser sensors is a tear line thickness measuring apparatus for a vehicle airbag cover, characterized in that the zero point by pre-input the standardized dimensions in advance using a master gauge.
The method of claim 1,

The control means,

A key input unit;

A display unit displaying thickness information and a measurement result value of the airbag forming unit including a tear line;

A transceiver for receiving information about the thickness of the tear line measured by the pair of laser sensors, and transmitting an operation control signal of the transfer means and the transfer bracket through the key input unit;

A storage unit configured to store information about the measured tear line thickness and to store reference thickness information of a tear line of a crash pad according to a vehicle type and a program for performing a measurement operation; And

The thickness information of the tear line is extracted by receiving the thickness information of the airbag forming unit measured from a pair of laser sensors provided at the upper and lower portions of the crash pad through the transceiver and calculating a value having the smallest distance difference among the upper and lower data. And a control unit for controlling the control unit to display the extracted information through the display unit in numerical and graphical form.
The method of claim 6,

Tearline thickness measuring apparatus of a vehicle airbag cover further comprises a wired or wireless communication unit for wired or wireless communication with an external PC (PC) for managing settings or data.