JP2007118893A - Method and device for forming fracture scheduled part of airbag door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fracture scheduled part of an airbag door with high accuracy responding to the positional deviation of a base material. <P>SOLUTION: A groove forming means 34 to be movement-controlled by a control means 38 is moved along an outer peripheral contour of an airbag door while performing the cut-in at a predetermined depth from a back surface 12A side of a base material 12 to constitute a vehicular interior member. Before the grooving, the surface position of a part immediately before performing the grooving by the groove forming means 34 in the back surface 12A of the base material 12 is obtained from the back surface 12A side by a measurement means 36, and the position data is output to the control means 38. The control means 38 realizes the predetermined working depth of a groove 18 from the back surface 12A by controlling the working by the groove forming means 34 based on the reference to be successively updated as the position data is input from the measurement means 36. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for forming a predetermined breakage portion of an airbag door by processing a groove having a predetermined depth on one surface of a base material constituting a vehicle interior member, and an apparatus for carrying out the method. Is.

  Most automobiles produced in recent years are equipped standardly with an airbag device for a driver's seat and an airbag device for a passenger's seat in order to protect an occupant from an impact caused by a collision accident or the like. For example, an airbag device for a passenger seat is equipped in a state of being stored inside the front of the passenger seat in an instrument panel as a vehicle interior member assembled in front of the passenger compartment. For this reason, as illustrated in FIG. 2, the synthetic resin base material 12 constituting the instrument panel 10 has airbag doors 14 and 14 that are opened and displaced toward the passenger compartment, and the airbag device 20 for the passenger seat. It is provided in the part corresponding to.

  The airbag doors 14, 14 constitute a part of the base material 12 before the operation of the airbag device 20, and when receiving the pressing force of the airbag 22 that has started to expand due to the operation of the airbag device 20. The airbag doors 14 and 14 are allowed to be separated from the base material 12 and disengaged from each other by breaking the planned break portion 16 formed along the outer peripheral contour of the airbag doors 14 and 14. When the airbag doors 14 and 14 are opened, an opening is defined in the base member 12, and the inflation and deployment of the airbag 22 toward the passenger compartment is allowed through the opening. ing. Here, the fracture | rupture scheduled part 16 of the airbag doors 14 and 14 is providing the groove | channel 18 of the predetermined depth continuously, for example in the back surface of the base material 12, or providing a several bottomed hole for every required space | interval. It is a weakened part and does not appear on the surface of the substrate 12.

  By the way, when the airbag apparatus 20 act | operates, the scheduled break part 16 of the airbag doors 14 and 14 is requested | required to fracture | rupture quickly and reliably, On the other hand, as a part of the base material 12 in the state before an operation | movement. Structural strength is required so that unintended breakage or deformation does not occur. That is, the rupture property and strength of the planned fracture portion 16 are defined by the dimension (residual thickness) of the base material 12 remaining when the groove 18 is formed at a predetermined depth. Any of the cases where the entire scheduled portion 16 is not uniform adversely affects the deployment performance of the airbag doors 14, 14. Thus, it is calculated | required that the fracture | rupture planned part 16 is formed so that the residual thickness may become fixed, and the severe precision of about +/- 0.1mm is requested | required.

  As a method of forming the planned fracture portion 16, for example, in the molding process of the base material 12 by a molding technique such as injection molding, the projecting piece protruding in a cavity defined in the molding die can be used. There is one that forms the planned fracture portion 16 simultaneously with the molding. In this method, after a protrusion is plunged into a resin material in a molten state within a mold by a predetermined depth, the protrusion is held until the resin material is cured to some extent, and the shape of the protrusion is transferred to the substrate 12. By doing so, the groove | channel 18 which makes the fracture | rupture scheduled part 16 is formed. However, in this method, although the planned fracture portion 16 can be formed with relatively high accuracy, the molded base material 12 is affected by the influence of the protrusions that hinder the flow of the resin material in the cavity and the variation in the curing rate. There is a problem that the appearance is deteriorated, such as a pattern protruding on the surface side.

Therefore, in the next step of the forming process for forming the base material 12 into a predetermined shape, the base material 12 is cut by a predetermined depth from the back surface to form the groove 18 using a forming device having a laser, a rotary cutting tool, or the like. Thus, a method of forming the planned break portion 16 of the airbag door 14 has been attracting attention (see, for example, Patent Document 1). As shown in FIG. 3, the cutting apparatus of Patent Document 1 is configured to cut the groove 18 in a predetermined direction while cutting the groove 18 with a predetermined depth by the cutting blade 54 on the base 12 placed and fixed on the fixed base 52. It is the structure which forms the fracture | rupture scheduled part 16 of a predetermined shape by moving. Further, the cutting device covers the mounting surface 52a of the base material 12 on the fixed base 52 with a metal film, and the distance sensor 56 is provided with the distance sensor 56 capable of detecting the metal film on the cutting blade 54. The interval T2 on the mounting surface of the fixed base 52 is detected. Then, the residual thickness A (interval from the bottom surface of the groove 18 to the surface of the fixing base 52) A is calculated by subtracting the interval T1 between the tip of the cutting blade 54 and the interval sensor 56 from the detected interval T2. The vertical position of the cutting blade 54 is controlled by an actuator (not shown) so that the residual thickness A is within the allowable range.
JP 2002-86397 A

  By the way, the base material 12 may be deformed due to variations in heat shrinkage, a state at the time of storage, and the like. May occur (see FIG. 3). That is, since the cutting device of Patent Document 1 controls the vertical movement of the cutting blade 54 with reference to the mounting surface 52a of the fixed base 52, at the site where the base material 12 is lifted from the mounting surface 52a, The amount of cut into the base material 12 is increased by this lift, and the problem is that the planned fracture portion 16 is not formed at the predetermined residual thickness A. Thus, in the configuration based on the mounting surface 52a of the fixed base 52, the actual position of the base material 12 mounted on the mounting surface 52a cannot be reflected, and the fracture is scheduled with the required accuracy. It is difficult to always form the portion 16. In addition, since the base material 12 that bears the structural part of the instrument panel 10 is relatively high in rigidity, the base 12 is completely lifted by air suction by a suction device provided on the fixed base 52 and pressing by an appropriate jig. It is difficult to prevent the above problems, and the above-mentioned problems are easily developed.

  In order to form the planned fracture portion with a certain residual thickness in response to the above-described lifting of the base material from the fixed base, an interval sensor is provided on the fixed base, and a cutting blade is provided according to the gap between the fixed base and the base material. A configuration in which advance / retreat is controlled is also possible. However, since the function of placing and supporting the base material is given priority to the fixed base, unlike the case where the distance sensor is provided in an open space such as above the fixed base, there is a problem that the installation space is greatly restricted. In addition, in the configuration in which the interval sensor is installed on the fixed base, it is necessary to install a plurality of interval sensors on the fixed base in accordance with the shape of the planned fracture portion.

  That is, the present invention has been proposed in order to suitably solve these problems inherent in the conventional method for forming a fractured portion of an airbag door and the forming apparatus thereof according to the prior art, and has a simple configuration. An object of the present invention is to provide a method and an apparatus for forming a scheduled breakage portion of an airbag door with high accuracy corresponding to a positional shift of a base material.

In order to overcome the above-mentioned problems and achieve the intended purpose, a method for forming a scheduled breakage portion of an airbag door according to claim 1 of the present application,
This is a method of forming a predetermined breakage portion of an airbag door by processing a groove having a predetermined depth on one surface of a base material constituting a vehicle interior member by a groove forming means whose movement is controlled by a control means. And
Prior to grooving, the surface position of the portion immediately before grooving by the groove forming means on the one surface is obtained from the one surface side by the measuring means, and the position data is output to the control means,
The control means controls the processing by the groove forming means based on a reference that is sequentially updated with the input of position data from the measuring means, so that the processing depth of the groove from the one surface is constant. It is characterized by that.
According to the first aspect of the present invention, prior to performing the groove processing by the groove forming means, the surface position immediately before the groove processing by the groove forming means on one surface of the substrate is obtained by the measuring means. Thus, the actual surface position on the one surface can be grasped. Then, the reference for groove processing is sequentially updated in accordance with the position data input from the measuring means, and the control means performs processing by the groove forming means based on the reference reflecting the actual surface position of one surface. By controlling, the processing depth of the groove from one surface can be made constant. In other words, the processing depth of the groove can be made constant in response to changes in the shape of the base material and positional displacement, so that the base material portion remains by a predetermined thickness over the entire portion to be broken. It can be formed with high accuracy.

According to a second aspect of the present invention, in the method for forming a scheduled breakage portion of the airbag door according to the first aspect, the control means determines that the updated reference is closer to the groove forming means than the previous reference. The groove forming means is controlled to move in a direction away from the base material according to this, and when it is determined that the updated reference is separated from the groove forming means compared to the previous reference, In response to this, the groove forming means is controlled to move in the direction of traveling toward the substrate.
According to the second aspect of the present invention, the groove forming means is moved forward and backward with respect to the base material by comparing the reference inputted by the measuring means and updated with the previous reference, so that the groove from one surface can be moved. The processing depth can be made constant.

According to a third aspect of the present invention, in the method for forming a scheduled breakage portion of the airbag door according to the first or second aspect, the measuring means moves in conjunction with the groove forming means, and the measuring means and the base material The surface position of the one surface was obtained by measuring the distance between the one surface.
According to the invention according to claim 3, the groove processing on the one surface of the substrate can be performed by moving the measuring device that measures the distance between the one surface of the substrate and the groove forming device. The surface position immediately before being performed can be obtained successively and accurately.

In order to overcome the above-mentioned problems and achieve the intended purpose, an airbag door fracture scheduled part forming device according to claim 4 of the present application is
This is an apparatus for forming a predetermined breakage portion of an airbag door by processing a groove having a predetermined depth on one surface of a base material constituting a vehicle interior member by a groove forming means whose movement is controlled by a control means. And
It is arranged so as to move in conjunction with the groove forming means, the surface position of the portion immediately before the groove forming means on the one surface is subjected to groove processing is obtained from the one surface side, and the position data is controlled by the control Measuring means for outputting to the means,
The control means controls the machining by the groove forming means based on a reference that is sequentially updated with the input of position data from the measuring means, so that the machining depth of the groove from the one surface is constant. It is characterized by having comprised.
According to the fourth aspect of the present invention, prior to performing the groove processing by the groove forming means, the surface position immediately before the groove processing by the groove forming means on one surface of the substrate can be obtained by the measuring means. Therefore, the actual surface position on the one surface can be grasped. Then, the reference for groove processing is sequentially updated in accordance with the position data input from the measuring means, and the control means performs processing by the groove forming means based on the reference reflecting the actual surface position of one surface. It becomes possible to control, and the processing depth of the groove from one surface can be made constant. In other words, the processing depth of the groove can be made constant in response to changes in the shape of the base material and positional displacement, so that the base material portion remains by a predetermined thickness over the entire portion to be broken. It can be formed with high accuracy.

  According to the method for forming the planned break portion in the airbag door according to the present invention, the groove can be accurately formed at a constant processing depth corresponding to the shape and displacement of the base material, and only a predetermined thickness is provided. The fractured portion of the remaining airbag door can be formed on the base material.

  According to the apparatus for forming a scheduled breakage portion of an airbag door according to another invention of the present application, the air that is easily left in a certain thickness with a simple configuration and corresponding to the shape and displacement of the base material can be easily obtained. The planned break portion of the bag door can be formed on the base material.

  Next, a preferred embodiment of a method for forming a scheduled breakage portion of an airbag door and a forming apparatus for carrying out this forming method according to the present invention will be described below with reference to the accompanying drawings. For convenience of explanation, the same reference numerals are used for the same elements as those of the instrument panel provided with the airbag device shown in FIG. 2, and detailed description thereof is omitted.

  In the instrument panel (vehicle interior member), the base material on which the airbag door is integrally formed is a relatively hard member formed of a synthetic resin material such as PP or ASG into a predetermined shape by injection molding or the like, The portion of the base material where the planned breakage portion of the airbag door is formed by a forming device described later has at least a constant thickness. When the instrument panel is composed of a single base material, most of the grooves forming the planned breakage portion of the airbag door are provided on the back surface of the base material facing the airbag device, and the instrument panel covers the base material. In the case of a multi-layer covered with another member such as a skin material or a foam material, it can also be provided on the surface of the base material facing the cabin. Here, in the embodiment, the groove constituting the planned breakage portion of the airbag door is provided so as to open on the back surface of the base material, and the breakable portion cannot be identified from the cabin side which is the design surface (front surface). A so-called invisible type will be described. In other words, the one surface of the base material is a surface on which a groove constituting the planned fracture portion is opened, and in the examples, refers to the back surface of the base material.

  As shown in FIG. 1, an airbag door fracture scheduled portion forming apparatus (hereinafter simply referred to as a forming apparatus) according to an embodiment performs a groove process on a base member 12 and a fixing means 32 that holds the base member 12. It basically comprises a groove forming means 34, a measuring means 36 for determining the surface position of the back surface 12A of the substrate 12, and a control means 38 for controlling the movement of the groove forming means 34. This forming apparatus is an NC processing machine that controls the position of the groove forming means 34 with respect to the base material 12 based on setting information pre-programmed in the control means 38, and the groove forming means 34 is controlled under the control of the control means 38. By moving along a predetermined trajectory, the planned fracture portion 16 of the outer peripheral contour shape of the airbag door is formed. Further, when the forming apparatus holds the base material 12 on the fixing means 32, the groove forming means 34 performs groove processing from the back surface (one surface) 12 </ b> A of the base material 12 that is a surface facing the groove forming means 34. In this way, the base material 12 having a thickness T is grooved at a processing depth F to form a planned fracture portion 16 having a residual thickness A. Further, the forming apparatus reflects the surface position of the back surface 12A of the base material 12 obtained by the measuring means 36 at the time of groove processing, the processing by the groove forming means 34 is controlled, and the processing depth F of the groove 18 is changed from the back surface 12A. It can be made constant at all times.

  The fixing means 32 includes a fixing portion 32a formed in accordance with the shape of the surface 12B of the base material 12 that curves so as to protrude, and the fixing portion 32a is formed to open upward. Then, the base material 12 is placed on the fixing portion 32a of the fixing means 32 in a state where the surface 12B side is abutted, and is matched with the shape of the bending fixing portion 32a so as not to move by the fixing means 32. The In the fixing means 32, the base 12 is held with the front surface 12B facing the fixing portion 32a, while the back surface 12A serving as a groove processing surface is exposed upward, and groove processing from above is allowed.

  The groove forming means 34 is disposed above the fixing means 32 so as to face the fixing portion 32a of the fixing means 32, and is three-dimensional with respect to the substrate 12 held by the fixing portion 32a under the control of the control means 38. Configured to move. As the groove forming means 34, a cutting tool itself such as an end mill, a milling cutter, a hot blade, an ultrasonic cutter, a cold knife or the like cuts into the substrate 12 to mechanically form the groove 18, or is synthesized by irradiating a laser. A laser irradiator or the like that forms the groove 18 by partially melting the substrate 12 made of resin can be employed. The groove forming means 34 of the embodiment is a milling machine equipped with an end mill 34a having cutting edges on the outer peripheral surface and the end surface, and forms the groove 18 by cutting into the base material 12 while rotating the end mill 34a. As the groove forming means 34 moves in the horizontal direction, the streak provided in the process of moving the end mill 34 a in the horizontal direction while cutting into the base material 12 becomes the planned fracture portion 16. That is, the groove forming means 34 of the embodiment is configured to move in a direction that advances and retreats with respect to the base material 12 and to perform a movement in the horizontal direction along the back surface 12A of the base material 12 in a composite or individual manner. The

  The measuring means 36 is disposed above the fixing means 32 so as to face the fixing portion 32a of the fixing means 32, and the surface position of the back surface 12A of the base 12 held by the fixing portion 32a is determined from the back surface 12A side. It is obtained continuously or at every required interval. Further, the measuring means 36 outputs the obtained surface position of the back surface 12A of the base material 12 to the control means 38 as position data. As the measuring means 36, the amount of vertical displacement of the non-contact type distance measuring device such as laser, electromagnetic waves such as light and radio waves, ultrasonic waves, magnetism, etc., or the follower contacting the back surface 12A of the substrate 12 is measured. A mechanical contact type distance measuring device can be employed, and in the embodiment, a laser displacement measuring device is employed. In the measuring means 36, the distance between the measurement point 36 on the back surface 12A of the base material 12 and the measurement means 36 is measured by a laser, and the surface occupied by the back surface 12A of the base material 12 from the magnitude of the distance from the measurement means 36 at the measurement point. The position is specified. The surface position of the back surface 12A of the substrate 12 is a coordinate in the vertical direction (thickness direction of the substrate 12) occupied by the back surface 12A.

  The measuring means 36 is disposed on the front side in the traveling direction of the groove forming means 34 that is moved in the horizontal direction by the control means 38, and the groove forming means 34 is formed on the back surface 12A of the substrate 12 prior to the groove processing. Is set so as to obtain the surface position of the part immediately before grooving (the part immediately before grooving). The measuring means 36 is configured to move in conjunction with the groove forming means 34. Even if the groove forming means 34 moves, the positional relationship with the groove forming means 34 does not change, and the relative distance is always constant. It has become. The portion immediately before grooving on the back surface 12A of the substrate 12 is in the vicinity of the end mill 34a during grooving, and the front side in the traveling direction, the lateral side in the traveling direction, and the traveling direction of the end mill 34a moving in the horizontal direction as the grooving is performed. The region including the rear side and excluding the groove 18 formed by the groove forming means 34 is indicated. The measuring means 36 of the embodiment is set so as to measure the front side in the advancing direction in the movement of the groove forming means 34 in the horizontal direction, and the surface of the back surface 12A of the substrate 12 over the entire line scheduled to be grooved. The position is to be calculated.

  The control means 38 controls the groove forming means 34 and other devices on the basis of information input from the measuring means 36, the operating means, etc. and setting information programmed in advance. The setting information is set in advance as a program such as the planar shape of the base material 12, the shape of the outer peripheral contour of the airbag door, the groove processing order, and the control means 38 determines the groove forming means 34 based on the setting information. It is controlled to move in the horizontal direction along a trajectory along the outer peripheral contour of the airbag door. Further, the control means 38 starts the processing start point of the base material 12 based on information such as the thickness T and processing depth F of the base material 12 input from the operation means before the groove processing by the groove forming means 34. Position data is generated, and the groove forming means 34 is controlled to be cut toward the base material 12 by the machining depth F from the reference, based on the origin position data of the control means 38 at the machining start point. Then, the control means 38 cuts the groove forming means 34 at the machining depth F from the reference based on the origin position data at the machining start point, and then uses it as a reference that is sequentially updated as the position data is input from the measuring means 36. Based on this, the groove forming means 34 is configured to be controlled.

  The forming apparatus determines that the updated reference is close to the groove forming means 34 (measurement means 36) by comparing the previous reference (or the reference based on the origin position data) with the control means 38. Accordingly, the groove forming means 34 is controlled so as to move in the direction of retreating from the substrate 12. Further, the forming apparatus determines that the updated reference is separated from the groove forming means 34 (measurement means 36) by comparing the previous reference (or the reference based on the origin position data) with the control means 38. Accordingly, the groove forming means 34 is controlled to move in the direction of traveling toward the substrate 12. In this process, the groove 18 is cut by the groove forming means 34 with a locus matched to the outer peripheral contour of the airbag door and at a constant processing depth F, so that the scheduled break portion 16 of the airbag door is formed. Yes. In this way, the forming apparatus reads the surface position of the back surface 12A of the base material 12 that changes due to the shape, positional deviation, and the like as the groove forming means 34 moves in the horizontal direction by the measuring means 36 prior to groove processing, and this position. The processing depth F of the groove 18 from the back surface 12A can be made constant by moving the groove forming means 34 forward and backward with respect to the base material 12 by the control means 38 reflecting the data.

(Effects of Example)
Next, the operation of the airbag door scheduled break portion forming apparatus according to the embodiment will be described together with the scheduled break portion forming method for the airbag door using the forming apparatus.

  First, the base material 12 is set in a state where the front surface 12B is abutted against the fixing portion 32a of the fixing means 32, and the back surface 12A serving as a groove processing surface faces the groove forming means 34 waiting on the upper side. Here, since the fixing | fixed part 32a is formed according to the shape of the base material 12, the base material 12 corresponds to the fixing | fixed part 32a in shape, and is hold | maintained. However, when the base material 12 has deformation such as deflection or distortion, there may be a gap S between the surface 12B of the base material 12 and the fixing portion 32a.

  And while inputting the thickness T of the base material 12 to the control means 38 from an operation means, the process depth F of the groove | channel 18 from the back surface 12A is input. That is, in the forming apparatus, since the groove forming means 34 moves forward and backward in the thickness direction of the base 12 from the back surface 12A of the base 12 placed on the fixing portion 32a, the groove 12 is processed. By setting the thickness T and the processing depth F, the residual thickness A of the planned fracture portion 16 is determined. At this time, by setting the thickness T of the base material 12 in the control means 38, the surface position of the processing start point on the base material 12 is the same as the fixing portion 32 a when the base material 12 is placed on the fixing portion 32 a. Calculated from the relationship, the origin position data is also set in the control means 38. In addition, the setting step of the thickness T and the processing depth F of the base material 12 is performed as necessary, and it is necessary to perform it every time in a lot in which the base material 12 having the same thickness T is grooved at the same processing depth F. Absent.

  When the groove processing step is started, the groove forming means 34 that has been waiting above the substrate 12 moves to a position corresponding to the processing start point of the back surface 12A, and the end mill 34a is rotationally driven at a predetermined rotational speed. The Based on the origin position data of the machining start point set in the control means 38, the groove forming means 34 descends toward the substrate 12, whereby the end mill 34a is cut to a predetermined depth from the back surface 12A at the machining start point. . Then, while performing groove processing by the end mill 34a, the groove forming means 34 is moved in the horizontal direction so as to draw the outer peripheral contour shape of the airbag door in a predetermined order based on the setting information of the control means 38.

  At this time, in the grooving step, the surface position of the back surface 12A of the substrate 12 that changes as the groove forming means 34 moves in the horizontal direction according to the setting information of the control means 38 is read by the measuring means 36 prior to grooving. To the control means 38. Here, since the measuring means 36 is configured to read the portion immediately before the groove processing by the groove forming means 34 on the back surface 12A of the base material 12, the groove processing is performed from now on as the groove forming means 34 moves in the horizontal direction. The actual surface position of the part can be grasped before grooving. Then, the control means 38 compares the updated reference inputted from the measuring means 36 with the previous reference, and moves the groove forming means 34 in the direction of advancing / retreating with respect to the substrate 12 by the difference between the two. That is, when it is determined that the back surface 12A of the base material 12 increases in the direction approaching the groove forming unit 34, the reference increases accordingly, and the back surface 12A of the base material 12 moves away from the groove forming unit 34. If it is determined that the value will be lower, the reference will be lowered accordingly. Therefore, since the groove forming means 34 can always cut the groove 18 having the processing depth F from the actual reference reflecting the change of the surface position on the back surface 12A, the base material 12 is broken at a constant residual thickness A. The planned portion 16 is formed. When the groove forming process is completed by moving the groove forming means 34 along the outer peripheral contour of the airbag door, the forming apparatus raises the groove forming means 34 away from the base material 12 and waits for the end mill 34a. Stop rotation.

  According to the method for forming a planned fracture portion of the present embodiment, as illustrated in FIG. 1B, the base material 12 is lifted from the fixing portion 32a, and a gap S is left between the base material 12 and the fixing portion 32a. Even in this case, the position data obtained by the measuring means 36 is reflected, and the groove forming means 34 is lifted and displaced by the lifted amount. Therefore, the groove processing is performed at the processing depth F from the lifted back surface 12A. Done. That is, even if the base material 12 is displaced with respect to the fixed portion 32a, the groove 18 is formed at a predetermined depth F with reference to the current surface position on the back surface 12A of the base material 12 reflected by the measuring means 36. By cutting, it can form in the base material 12 with sufficient precision in the state which left only the fixed residual thickness A as the whole fracture | rupture scheduled part 16. FIG. As described above, since the portion to be broken 16 can be formed with a constant residual thickness A as a whole, the airbag door can be quickly and reliably deployed during the operation of the airbag apparatus, and stable occupant protection performance can be exhibited. In addition, since the air bag apparatus is appropriately configured as a part of the base material before the operation of the airbag apparatus, the vehicle interior member is not deteriorated in texture due to deformation or the like.

  In addition, the measuring means 36 of the embodiment is disposed on the front side in the traveling direction of the groove forming means 34, and on the front side in the traveling direction of the groove forming means 34 on the back surface 12 </ b> A of the base material 12. The part to be processed is read. That is, the forming apparatus moves the groove forming means 34 forward and backward based on the position data of the portion of the base material 12 where the groove 18 is to be processed. Can be formed.

  Moreover, since the measuring means 36 measures the back surface 12A of the base material 12, which is the surface on which grooves are processed, it can be disposed in the open space above the fixed portion 32a. There are few space restrictions. That is, the measuring means 36 can be disposed so as to move as the groove forming means 34 proceeds with the groove processing, and the base material is formed over the whole when the planned fracture portion 16 is formed by one measuring means 36. 12 back surface 12A can be read. In addition, it is possible to smoothly cope with the changeover of the measurement position on the back surface 12A of the base 12 due to a change in the shape of the planned fracture portion 16 or a change in the shape of the base 12. In particular, by arranging the measuring means 36 integrally with the groove forming means 34 so as to move in conjunction with the groove forming means 34, the means for moving the measuring means 36 can be omitted, and the groove forming means Since it moves following 34, it is not necessary to consider the changeover of the measurement position.

  Since the forming apparatus can cope with a positional shift of the base material 12 with respect to the fixing portion 32a, there is no need to press the fixing portion 32a with a jig even if the base material 12 is relatively hard. In addition, a high accuracy for strictly following the shape of the substrate 12 is not required. By adopting a milling machine using an end mill as the groove forming means 34, there is an advantage that equipment can be simplified and costs can be reduced as compared with laser processing.

(Example of change)
(1) In the embodiment, the forward / backward movement control of the groove forming means with respect to the base material is performed based only on the position data of the back surface of the base material by the measuring means. Is basically performed based on the setting information of the control means, and when there is a difference between the position data obtained by the measurement means and the setting information, the groove forming means is advanced and retracted according to the position data to correct The groove processing depth may be constant according to the reference based on the position data. In such a modified example of the forming apparatus, when the base material is lifted, the reference is based on the difference of the base material 12 in accordance with the position data on the back surface of the base material being shifted upward from the setting information. Change. Then, the control means moves the groove forming means forward and backward with respect to the base material by the difference in floating, and then forms the groove at a predetermined processing depth, so that the residual thickness of the planned fracture portion can be always constant. it can.

(2) In the embodiment, the groove forming means moves with respect to the base material held by the fixing means. However, even if the fixing means is moved with respect to the groove forming means, the groove forming means and the fixing means are not moved. The positional relationship between the groove forming means and the substrate may be displaced by moving in a complex manner.
(3) The groove forming means is not limited to a three-axis movement mode that is orthogonally displaced in the horizontal and vertical directions, but may be a robot arm as long as it can be displaced three-dimensionally in accordance with the shape or displacement of the substrate. As described above, it is possible to adopt a multiaxial aspect and other aspects.
(4) In the aspect in which the milling machine is adopted as the groove forming means, the groove forming means itself is moved forward and backward with respect to the base material to perform groove processing corresponding to the update of the reference. If a laser irradiator is adopted as the groove forming means, the adjustment can be performed only by adjusting the output of the laser irradiating the substrate without moving the groove forming means forward and backward. That is, by reducing the output of the laser irradiated from the laser irradiator, the groove processing can be performed corresponding to the displacement (rise) in the direction close to the groove forming means on the back surface of the substrate. On the contrary, by increasing the output of the laser irradiated from the laser irradiator, the groove processing can be performed in response to the displacement (lowering) in the direction away from the groove forming means on the back surface of the substrate. In addition to adjusting the output of the laser, a configuration in which the groove forming means moves forward and backward with respect to the substrate may be used in combination.

It is the schematic which shows the fracture part formation apparatus of the airbag door which concerns on the preferred Example of this invention. It is sectional drawing which illustrated the airbag door integrally molded by the base material which comprises an instrument panel. It is the schematic which shows the cutting device of the fracture part in the conventional airbag door.

Explanation of symbols

12 base material, 12A back surface (one surface), 16 fracture planned part, 18 groove,
34 groove forming means, 36 measuring means, 38 control means

Claims (4)

A groove (18) having a predetermined depth is formed on one surface (12A) of the base material (12) constituting the vehicle interior member by the groove forming means (34) whose movement is controlled by the control means (38). And a method of forming the expected breakage portion (16) of the airbag door,
Prior to grooving, the surface position of the portion immediately before grooving by the groove forming means (34) on the one surface (12A) is obtained from the one surface (12A) side by the measuring means (36), Output the position data to the control means (38),
The control means (38) controls the processing by the groove forming means (34) based on a reference that is sequentially updated with the input of position data from the measurement means (36), thereby the one surface. A method for forming a scheduled breakage portion of an airbag door, characterized in that the processing depth of the groove (18) from (12A) is made constant.   When it is determined that the updated reference is closer to the groove forming means (34) than the previous reference, the control means (38) is configured so that the groove forming means (34) responds accordingly. If it is determined that the updated reference is moved away from the groove forming means (34) compared to the previous reference, the groove forming means ( The method for forming a scheduled breakage portion of an airbag door according to claim 1, wherein 34) is controlled to move in a direction of proceeding toward the base material (12).   The measuring means (36) moves in conjunction with the groove forming means (34), and measures the distance between the measuring means (36) and one surface (12A) of the substrate (12). The method of forming a scheduled breakage portion of the airbag door according to claim 1 or 2, wherein the surface position of the one surface (12A) is obtained. A groove (18) having a predetermined depth is formed on one surface (12A) of the base material (12) constituting the vehicle interior member by the groove forming means (34) whose movement is controlled by the control means (38). And an apparatus for forming the scheduled breakage portion (16) of the airbag door,
It is arranged to move in conjunction with the groove forming means (34), and the surface position of the one surface (12A) immediately before performing groove processing by the groove forming means (34) on the one surface ( 12A) from the side, comprising the measurement means (36) for outputting the position data to the control means (38),
The control means (38) controls the processing by the groove forming means (34) based on a reference that is sequentially updated with the input of position data from the measurement means (36), thereby the one surface ( An apparatus for forming a scheduled breakage portion of an airbag door, characterized in that the processing depth of the groove (18) from 12A) is constant.

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