WO2017217052A1 - Resin-molded-component machining apparatus and resin-molded-component machining method - Google Patents

Abstract

The present invention provides a machining apparatus with which a resin molded component provided with a predetermined breaking line having good invisibility and the like is obtained and provides a machining method using the same. The machining apparatus or the like for forming, in a resin molded component, a predetermined breaking line that does not reach a surface includes a machine tool that forms the predetermined breaking line in the resin molded component, a support table on which the resin molded component is loaded, and a linear rib that curves the resin molded component in a convex shape on the support table. The linear rib has a small-width section where the width is relatively small and a large-width section where the width is relatively large. When the resin molded component is pressed against the linear rib by means of a suction device, at least a portion of the resin molded component corresponding to the small-width section is curved in a convex shape.

Description

Resin molded product machining apparatus and resin molded product machining method

The present invention relates to a machining apparatus for a resin molded product or the like, which is an automobile interior material, and a method for machining a resin molded product using the same.
In particular, a machine for a resin molded product that does not affect the measurement of the depth of a planned fracture line formed on a resin molded product, and that produces little residual stress in the resin molded product and provides excellent invisibility. The present invention relates to a processing apparatus and a method of machining a resin molded product using the processing apparatus.

2. Description of the Related Art Conventionally, as a type of machining apparatus, an air bag breaking line (which may be referred to as an airbag tear line or a tear line) that is broken in a short time with high accuracy when the airbag is deployed is formed. An air bag fracture line forming apparatus has been proposed (see Patent Document 1).
More specifically, at a low cost, a thin-wall processing base that can be set by turning over the skin that forms the grid portion of the airbag to set the planned airbag breaking line, and the thin-wall processing base are set. A planned airbag break line comprising: a guide body arranged above the formed skin; and a cutting tool capable of cutting the skin along a guide groove for cleavage line processing formed in the guide body. Forming device.

In addition, a formation method for efficiently forming the planned tearing portion (airbag fracture line) during vacuum forming of the skin has been proposed (see Patent Document 2).
More specifically, when vacuum forming the skin for the compartment side member having the airbag door, the skin sheet is shaped by heating and softening and sucking it into the vacuum forming die. This is a method of forming a groove-shaped pre-scheduled portion by pressing the surface-scheduled part forming position of the skin with respect to the airbag door with a processing blade in a state where the sheet for use is sucked and held.

On the other hand, the applicant of the present invention has proposed a method for manufacturing an interior member for a vehicle having an invisible type airbag door portion in which a planned fracture line that cannot be recognized from the front side is formed (see Patent Document 3). ).
More specifically, in order to facilitate measurement of depth and the like, when pressed onto a stage provided with a predetermined rib and curved so that the back surface of the skin is convex, it is substantially V-shaped. And a depth of the planned fracture line or a thickness of the remaining portion is measured in a state where the cut line of the planned fracture line is opened.

JP 2000-351355 (Claims) JP 2000-159047 A (Claims etc.) WO2004 / 045921 (Claims etc.)

However, in the airbag fracture planned line forming apparatus described in Patent Document 1, it has been necessary to bend so that the back surface of the skin becomes concave by the pedestal for thin processing.
Therefore, when the skin is flattened after forming the planned fracture line (airbag tearing line), since large irregularities are formed on the back surface of the skin including the planned fracture line, cutting with the foam layer, etc. There was a problem that it was difficult to form uniformly.
In addition, when the skin is flattened in the same manner after cutting, the state where the portion where the planned fracture line is formed is partially maintained, so that the formation location can be recognized when viewed from the surface side of the skin, That is, the problem that it is inferior to invisible property (non-visibility) was also seen.

Further, in the method of forming the planned tear portion described in Patent Document 2, the formation position of the planned tear portion of the skin with respect to the airbag door of the skin sheet in the state of being sucked and held in the vacuum forming die There was a need to create.
Therefore, although the formation position in the skin sheet is less likely to shift during cutting, the skin sheet is heated and softened, so when it is returned to room temperature, it is misaligned. It was difficult to control accurately.
In addition, when the epidermis is flattened after forming the planned cleavage part, a large unevenness is formed on the back surface of the epidermis including the planned cleavage part, so that the formation location can be recognized when viewed from the front side of the epidermis That is, there was a problem that it was inferior in invisibility.

On the other hand, according to the airbag forming method using the predetermined rib described in Patent Document 3, it has been found that invisibility is remarkably improved as compared with Patent Documents 1 and 2.
However, since the line width of the rib to be used is substantially the same at any location, when the resin molded product is pressed against the rib, it is partially plastically deformed, thereby generating residual stress. A case was seen.
Therefore, when viewed from the back side of the resin molded product, that is, from the side where the planned fracture line is not formed, the portion where the planned fracture line is formed may be seen through depending on the visual angle. That is, it can be said that further improvement of invisibility has been desired.

Therefore, the inventor diligently studied, and by using linear ribs of different shapes with different line widths, the depth of the expected fracture line formed in the resin molded product that is a resin molded product can be accurately measured, The present invention has been completed by finding out that plastic deformation due to pressing of linear ribs and generation of residual stress based thereon can be suppressed.
That is, the present invention is a resin molded product machine that has less residual stress in the resin molded product and has excellent invisibility without affecting the depth measurement of the planned fracture line formed in the resin molded product. It aims at providing the processing apparatus and the machining method of the resin molded product using the same.

According to the present invention, there is provided a machining apparatus for forming a planned fracture line that does not reach the surface of a resin molded product, a machine tool that forms the planned fracture line for the resin molded product, and the resin molded product. And a linear rib for convexly bending the resin molded product on the support base. The linear rib has a relatively narrow width portion and a relative width. When the resin molded product is pressed against the linear rib by the suction device, it is curved in a convex shape at least at a position corresponding to the narrow portion. A machined apparatus for a resin molded product is provided, which can solve the above-described problems.
That is, according to the machine for processing a resin molded product of the present invention, when the linear molded rib is used, when the resin molded product is pressed against the linear rib, at least the narrow portion is supported. Since it is curved in a convex shape at the position, the occurrence of residual stress in the resin molded product corresponding to the position of the narrow portion can be reduced.
As a result, even when viewed from the back side of the resin molded product, that is, the side where the planned fracture line is not formed, the formation site of the planned fracture line is not seen through, and excellent invisibility is obtained. Can do.
Further, according to the machine for processing a resin molded product of the present invention, the planned fracture line formed in the resin molded product also has a conventional curve because the planned fracture line is appropriately curved in a convex shape. It is possible to measure quickly and accurately using an optical measuring device.
In addition, since the linear ribs of a predetermined form are used, the degree of bending of the resin molded product can be easily adjusted. As a result, the replacement work of the resin molded product can be accelerated, and the formation speed of the planned fracture line can be increased. In addition, it is possible to increase the forming accuracy, and to extend the life of the machine tool that forms the planned fracture line.

Moreover, according to the machining apparatus of the present invention, the wide portion has at least the first wide portion and the second wide portion, and between the first wide portion and the second wide portion, It is preferable to have the first narrow portion as the narrow portion, and the first wide portion, the first narrow portion, and the second wide portion are arranged linearly.
By providing linear ribs with a predetermined shape in this way, it is possible to effectively use the support base. As a result, by simply moving the machine tool in a straight line, it is possible to quickly and accurately set the planned break line of a predetermined length. Can be formed.
Moreover, since it has a narrow part between the 1st wide part and the 2nd wide part, a fracture expected line can be formed in the state which does not deform | transform a resin molded product excessively. Therefore, it is possible to reduce the occurrence of residual stress and excessive adhesion at a position corresponding to the narrow portion of the resin molded product.

In addition, according to the machining apparatus of the present invention, the third wide portion and the fourth wide portion are provided at each of the end portions of the first wide portion that diverges and expands in a fan shape or a T shape. And the second narrow portion is provided between the end of the first wide portion and the third wide portion, and the other branched portion, It is preferable that a third narrow portion is provided between the end portion of the first wide portion and the fourth wide portion.
That is, the end portion of the first wide portion opposite to the end portion where the first narrow portion is provided branches and expands in a fan shape or a T shape, and the branched first portion One of the plurality of end portions of the wide portion is provided with a third wide portion via the second narrow portion, and another one of the plurality of end portions of the branched first wide portion. In addition, it is preferable that the fourth wide portion is provided via the third narrow portion.
By providing the linear ribs having a predetermined shape in this way, the support base can be effectively used as a whole, and can be applied to resin molded products of various shapes and sizes. The planned fracture line can be formed quickly and accurately.
Moreover, since the 3rd wide part and the 4th wide part are provided in the edge part of the 1st wide part, and it has a narrow part between them, a resin molded product is deform | transformed excessively In such a state, the expected fracture line can be formed. Therefore, it is possible to reduce the occurrence of residual stress and excessive adhesion at a position corresponding to the narrow portion of the resin molded product.
In addition, the depth of the planned fracture line formed in the resin molded product can be measured quickly and accurately at a plurality of locations by using a conventional optical measuring device.

In addition, according to the machining apparatus of the present invention, the fifth wide portion and the sixth wide portion are provided at each of the end portions of the second wide portion that diverges into a fan shape or a T shape. And a fourth narrow portion is provided between the end of the second wide portion and the fifth wide portion, and the other branched portion, It is preferable that a fifth narrow portion is provided between the end of the second wide portion and the sixth wide portion.
That is, the end portion of the second wide portion opposite to the end portion where the first narrow portion is provided is branched and widened in a fan shape or a T shape, and the branched second portion One of the plurality of end portions of the wide portion is provided with a fifth wide portion through the fourth narrow portion, and another one of the plurality of end portions of the branched second wide portion. In addition, it is preferable that the sixth wide portion is provided via the fifth narrow portion.
By providing the linear ribs having a predetermined shape in this way, the support base can be effectively used as a whole, and can be applied to resin molded products of various shapes and sizes. The planned fracture line can be formed quickly and accurately.
Moreover, since the 5th wide part and the 6th wide part are provided in the edge part of the 2nd wide part, and it has a narrow part between them, a resin molded product is deform | transformed excessively. In such a state, the expected fracture line can be formed. Therefore, it is possible to reduce the occurrence of residual stress and excessive adhesion at a position corresponding to the narrow portion of the resin molded product.
In addition, the depth of the planned fracture line formed in the resin molded product can be measured quickly and accurately at a plurality of locations by using a conventional optical measuring device.

According to the machining apparatus of the present invention, the width (W1) of the narrow portion constituting the linear rib is set to a value within the range of 1 to 10 mm, and the width (W2) of the wide portion is set to the range of 20 to 100 mm. It is preferable to set the value within the range.
By limiting the dimensions in this way, the pressing force of the narrow portion against the resin molded product is increased, and the portion corresponding to the narrow portion can be mainly curved in a convex shape, and as a result, The planned fracture line can be formed with high accuracy, and further, the accuracy of the depth of the planned fracture line can be further increased.

Further, according to the machining device of the present invention, a plurality of suction ports connected to the suction device are provided on the support base, and the number of suction ports per unit area provided around the narrow portion It is preferable to increase the number of suction ports per unit area provided around the wide portion.
By comprising in this way, the pressing force of the narrow part with respect to a resin molded product can be adjusted to an appropriate range, and the precision of the depth of a planned fracture line and a measurement precision can be improved more.

Further, according to the machining apparatus of the present invention, it is preferable that the resin molded product is an automobile interior member, the machine tool is a cold cutter, and the planned break line is a planned break line for an airbag. .
By configuring the automobile interior member having the location for accommodating the airbag device in this manner, it is possible to accurately form a planned fracture line with excellent invisibility for a predetermined location of the automobile interior member. it can.

Another aspect of the present invention is a machining method for forming a planned fracture line that does not reach the surface of a resin molded product with a machine tool, and includes the following steps (1) to (3): Is a machining method characterized by
(1) A step of placing a resin molded product on a support base provided with a linear rib for curving convexly. (2) A resin molded product is pressed onto the linear rib by a suction device to form a convex shape. Step of bending (3) Step of forming a planned fracture line for a resin molded product curved in a convex shape on a linear rib by a machine tool. Machining apparatus provided with linear ribs of a predetermined shape in this way When the resin molded product is pressed against the linear ribs, the planned fracture line can be formed without excessively deforming the resin molded product. Therefore, it is possible to reduce the occurrence of residual stress and excessive adhesion at a position corresponding to the narrow portion of the resin molded product.
Therefore, even when a planned fracture line is formed in a resin molded product, a resin molded product having excellent invisible properties can be efficiently obtained, and the depth of the planned fracture line formed in the resin molded product can be obtained. It can be said that there is no influence on the measurement.

FIG. 1 is a perspective view for explaining a support base provided with linear ribs. FIGS. 2A and 2B are a plan view and a side view for explaining a support base provided with linear ribs. FIG. 3 is a plan view and a side view for explaining an arrangement example of suction ports in the support base. 4 (a) to 4 (b) are views for explaining a state in which a resin molded product is pressed against the linear rib of the present invention and the conventional linear rib, respectively. FIG. 5 is a schematic view provided for explaining a machining device (airbag break planned line forming device). FIGS. 6A and 6B are views for explaining the modes of two types of airbag devices.

[First Embodiment]
1st Embodiment is a machining apparatus which forms the planned fracture line which does not reach the surface with respect to a resin molded product, Comprising: The machine tool which forms a planned fracture line with respect to a resin molded product, and resin molding And a linear rib that curves the resin molded product in a convex shape, and the linear rib has a relatively narrow narrow part and a relatively wide wide part. Each of which has a portion, and when the resin molded product is pressed against the linear rib by the suction device, it is curved at least at a position corresponding to the narrow portion. It is a machining device.
Hereinafter, an explanation will be given assuming that an airbag break planned line forming apparatus for forming an airbag break planned line (tear line) with respect to an automobile interior member which is a resin molded product as a machining apparatus.
In addition, the support stand 10 provided with the linear rib 13 of a predetermined shape, which is a characteristic configuration of the machining apparatus 100 of the first embodiment, will be mainly described with reference to the drawings as appropriate.

1. Types of Machining Device (1) As an aspect of the machining device (including machine tool) 100 illustrated in FIG. 5, the configuration includes predetermined break planned line forming means 131 and 133 and can form a planned break line. Although not particularly limited, for example, it is preferable to include at least one of a cutting device, a polishing device, a cutting device, a punching device, and the like.
Also, a combination of these planned fracture line forming means and an inspection device, vapor deposition device, coating device, heating device, or the like as another machining device may be used.

Here, examples of the cutting device include a cold cutter, an end mill, a vibration cutting device (including an ultrasonic vibration cutting device, an elliptical vibration cutting device, and the like), a rotary shaft cutting device, and the like.
In particular, when the resin molded product is an interior member for an automobile and the planned break line is a planned break line for an air bag (a break line for an airbag), that is, the machining device is an airbag break planned line forming device. In this case, it is more preferable to use a cold cutter as the machine tool because it is possible to quickly and accurately form a planned fracture line, and to generate little waste.

Then, the processing state of the resin molded product (depth of the planned fracture line, etc.) is monitored online using a laser displacement meter (for example, LKG5000 series, manufactured by Keyence Corporation) as a sensor, and feedback control is performed on the resin molding. The depth of the planned fracture line formed at a predetermined location of the product can be accurately adjusted to a value within a predetermined range.
Therefore, even when the air bag planned break line is formed by a machine tool such as a cold cutter, it can be formed quickly and accurately.

As a result, according to the machining apparatus 100 shown in FIG. 5, as shown in FIG. 6 (a), the airbag 15c and the airbag accommodating portion 15e formed between the plurality of ribs 15a and 15b, An air bag door member 40 that has a resin molded product 15 having a predetermined thickness (t1) as the expected breaking line 15d and that has little residual stress and is excellent in invisibility is inexpensive and It can be manufactured efficiently.
In the airbag door member 40, the thickness of the resin molded product before the planned fracture line 15d is formed is represented by the symbol t2.

Furthermore, according to the machining apparatus 100 shown in FIG. 5, even with the other airbag door member 41 ′ shown in FIG. 6 (b), there is little occurrence of residual stress, and air with excellent invisibility. The bag door member 41 ′ can be manufactured.
In other words, even if the resin molded product 15 has a three-layer structure including a hard base material 15d ′, an intermediate layer (foamed layer) 15e ′, and a skin 15f ′, two-stage machining is used. The airbag door member 41 ′ having the primary break planned line 15 g ′ and the secondary break planned line 15 h ′ can be manufactured extremely inexpensively and efficiently.
In this airbag door member 41 ', the depth of the planned fracture line (secondary fracture line) 15h' formed on the skin 15f 'is represented by the symbol t3.

(2) Airbag fracture planned line forming device (2) -1 Basic mode Further, when the machining device is an airbag fracture planned line forming device 100 as shown in FIG. A support base 10 on which an automobile interior member that is a molded product is placed is provided.
Then, a primary planned break line forming means 131 for forming a planned primary break line, for example, a planned break line having a predetermined width and a predetermined depth, with respect to the automobile interior member placed on the support 10. And, as a planned fracture line different from the planned primary fracture line, that is, as a secondary fracture planned line, for example, a secondary fracture planned line forming means 133 for forming a slit line having a predetermined depth is provided. Is preferred.

Therefore, the 1st processing blade detection means and the 2nd processing blade detection means which are attached to these are each provided in the back side of the mounting surface although not shown.
And these 1st processing blade detection means and the 2nd processing blade detection means are optical measuring devices, such as a laser displacement meter, when measuring from the front side of a resin molded product normally, and resin molded products When measuring from the back side, it is preferable to use an electromagnetic induction type measuring device such as an eddy current type film pressure gauge.
Further, the airbag break planned line forming apparatus 100 includes a control unit (for accurately positioning and processing operations of various primary fracture planned line forming means and secondary break planned line forming means, and further detecting operation and the like) It is preferable to have a computer control unit 116.

(2) -2 Supporting Base As shown in FIG. 5, the airbag break planned line forming apparatus 100 supports the vehicle interior member placed and fixed when forming the airbag broken planned line. A stand 10 is provided.
As shown in FIG. 1, the mounting surface of the support base 10 is a linear rib (projection) 13 that curves the resin molded product in a convex shape, and the linear rib 13 is relatively A narrow portion 11 having a narrow width and a wide portion 12 having a relatively wide width are provided.
Further, as shown in the plan view of FIG. 2A, the linear rib 13 has first to sixth wide portions 12a to 12f as the wide portion 12, and these first to sixth Between the wide portions 12a to 12f, the narrow portion 11 includes first to fifth narrow portions 11a to 11e.
Furthermore, as shown in the side view of FIG. 2B, predetermined linear ribs 13 are provided in the horizontal direction on the base 18b and the smoothed surface 18a of the support base 10.

Further, as shown in FIG. 1 and the like, a plurality of suction ports 14 are provided on the mounting surface of the support base 10, and the interior of the vehicle as a resin molded product 15 mounted on the mounting surface. A suction device (not shown) for sucking and fixing the member through the suction port 14 is provided.
The diameter of the suction port 14 is usually preferably a value in the range of 0.1 to 8 mm, more preferably a value in the range of 0.3 to 5 mm, and 0.5 to 3 mm. More preferably, the value is within the range.

Then, as shown in FIG. 3, regarding the suction port 14, the number of suction ports 14 per unit area provided around the narrow portion 11 is set to the per unit area provided around the wide portion 12. It is preferable to increase the number of suction ports 14.
The reason for this is that by changing the number of suction ports 14 in this way, the pressing force against the narrow portion 11 of the resin molded product 15 increases, and the accuracy of the depth of the planned fracture line and the measurement accuracy are further increased. It is because it can do.
Therefore, more specifically, a support base 10 having a predetermined suction port 14 is prepared, and the number of suction ports 14 provided around the narrow portion 11 is determined per unit area (for example, 100 cm ² ). It is preferable that the value is in the range of 10 to 50, and similarly, the number of suction ports 14 provided around the wide portion 12 is in the range of 1 to 8.

Moreover, as a suction device, a vacuum pump etc. can be used, for example. By providing such a suction device, even an interior member for automobiles having a complicated shape or a large interior member for automobiles can be easily fixed on the support base.
Therefore, it is possible to prevent the positional deviation of the automotive interior member when forming the planned airbag break line and the variation in the thickness of the remaining portion of the planned airbag break line, and to accurately form the planned airbag break line.
Further, in the case of a vacuum pump or the like, unlike the mechanical fixing means, whether or not the automobile interior member is fixed can be easily switched by turning on / off the operation of the suction device, and the work can be performed quickly.

In addition, in order to enhance the suction effect of the suction device, as shown in FIG. 1, when the support base 10 is a square, an annular groove 17 having a predetermined width is formed along the four sides around the support base 10, and an elastic groove is formed there. It is preferable to partially embed a member, for example, an O-ring.
That is, after an automobile interior member, which is a relatively large resin molded product 15, is placed at a predetermined location on the support base 10, for example, in an annular groove 17 having a width of 0.5 to 10 mm, O A state where the ring is partially embedded, that is, a part of the O-ring protrudes from the surface of the support base 10 can be arranged.
Next, if suction is performed by the suction device, the sealing performance between the automotive interior member as the resin molded product 15 and the support base 10 is remarkably improved by the deformation of the O-ring, and the suction effect can be remarkably enhanced. .
In addition, as a constituent material of the O-ring, at least one of urethane rubber, silicone rubber, acrylic rubber, olefin rubber, natural rubber, and the like can be given.

(2) -3 Linear ribs (narrow and wide)
The linear rib 13 provided horizontally on the support table 10 on which the resin molded product 15 is placed is moderately convex when the resin molded product 15 is pressed on the support table 10. Has a function of bending.
As shown in FIG. 1, the linear rib 13 has a narrow portion 11 having a relatively narrow width and a wide portion 12 having a relatively wide width.

That is, by using the linear rib 13 as shown in FIG. 1, when the resin molded product 15 is mainly pressed against the narrow portion 11, at least a position corresponding to the narrow portion 11 is relatively small. This is because the generation of residual stress (sometimes referred to as internal stress) in the resin molded product 15 corresponding to the position of the narrow portion 11 can be reduced.
More specifically, when the planned fracture line 15d is formed using the linear rib 13 as shown in FIG. 1, the rear side of the resin molded product 15, that is, the planned fracture line 15d is not formed. When viewed from the side, it can be said that the portion where the planned fracture line 15d is formed cannot be seen through regardless of the viewing angle.
And if it is such a linear rib 13, when the resin molded product 15 is pressed against the linear rib 13, at least a position corresponding to the narrow portion 11 is mainly convex. Since it bends, the depth (formation depth) of the planned fracture line 15d can be measured quickly and accurately using the conventional optical measuring device.
The mechanism for reducing the occurrence of residual stress is schematically shown in FIG.

On the other hand, when the conventional linear rib 13 'is constituted only by the narrow portion 11' having an equal width of about 1 to 2 mm as a whole, the resin molded product 15 is excessively curved in a convex shape. Become.
That is, as shown in FIG. 4B, when the resin molded product 15 is pressed against the linear rib 13 ′ (narrow portion 11 ′), the resin molded product is affected by the narrow portion 11 ′. 15 will be excessively curved in a convex shape.
As a result, the occurrence of residual stress in the resin molded product 15 increases at a position corresponding to the narrow portion 11 ′ constituting the linear rib 13 ′ as a whole.
That is, when the planned fracture line 15d is formed on the resin molded product 15 using the conventional linear rib 13 ', the planned fracture line 15d may be seen from the back side depending on the viewing angle due to the residual stress generated. It will show through.

The shape of the wide portion 12 in the linear rib 13 as shown in FIG. 1 is not particularly limited, that is, a polygon such as a triangle, a quadrangle, a pentagon, a hexagon, an octagon, a circle, or an ellipse. , Donut shape, or variant.
On the other hand, the shape of the narrow portion 11 in the linear rib 13 as shown in FIG. 1 is not particularly limited as long as it is at least one of a straight line, a wavy line, a zigzag line, etc. Furthermore, it may be at least one of a straight line, a wavy line, a zigzag line and the like having different widths at the tip or the intermediate position. In addition, the shape of the narrow portion is not necessarily a single line, and may be a double line or a triple line.

(First to second wide portions and first narrow portions)
Further, as shown in FIG. 1 and the like, specifically, the wide portion 12 in the linear rib has at least a first wide portion 12a and a second wide portion 12b, and the first wide portion 12a. And the second wide portion 12b, the first narrow portion 11a, the first wide portion 12a, the first narrow portion 11a, and the second wide portion 12b are respectively horizontal and It is preferable that they are arranged in a straight line.
The reason for this is that, by using the linear rib 13 having a predetermined shape in this way, it is possible to quickly and accurately form a predetermined fracture line of a predetermined length simply by moving the machining blade linearly. is there.
Further, since the first narrow portion 11a is provided between the first wide portion 12a and the second wide portion 12b, the residual stress at the position corresponding to the first narrow portion 11a of the resin molded product 15 is provided. Can also be reduced.
In addition, the depth of the planned fracture line formed in the resin molded product 15 can also be measured quickly and accurately using the conventional optical measuring device.

The shapes of the first wide portion 12a and the second wide portion 12b are not particularly limited as described above. However, the shape is not limited between the resin molded product 15 and the first narrow portion 11a. In order to prevent excessive adhesion and effectively utilize the entire support base 10, as illustrated in FIG. 1, the first narrow portion 11 a may have a symmetry relationship around the first narrow portion 11 a. preferable.
On the other hand, the shape of the first narrow portion 11a is not particularly limited as described above, but may be a single straight line or the like as illustrated in FIG.

(Third to fourth wide portions and second to third narrow portions)
Further, as shown in FIG. 2 and the like, the end portion of the first wide portion 12a in the linear rib 13 has a third wide portion 12c and a fourth wide portion 12d in a fan shape or a T shape, respectively. It is preferable.
And it has the 3rd wide part 12c and the 4th wide part 12d in each of the end part of the 1st wide part 12a which branched and expanded in the shape of a fan or T character in this way, and The second narrow portion 11b is provided between the end of the first wide portion 12a and the third wide portion 12c, and the other branched first portion It is preferable that a third narrow portion 11c is provided between the end of one wide portion 12a and the fourth wide portion 12d.

The reason for this is that, by using the linear rib 13 having a predetermined shape in this way, the entire support base 10 can be effectively utilized, and resin molded products of various shapes and sizes can be handled. .
And the 3rd wide part 12c and the 4th wide part 12d are provided in the end of the 1st wide part 12a which branched and expanded in the shape of a fan or T character, and between them, Since it has the 2nd narrow part 11b and the 3rd narrow part 11c, the fracture | rupture planned line 15d can be formed in the state which does not deform | transform the resin molded product 15 too much.
Therefore, it is possible to reduce the occurrence of residual stress and excessive adhesion at a position corresponding to the narrow portion 11 of the resin molded product 15, and thus excellent invisibility can be obtained.
Moreover, with such a linear rib 13, the depth of the planned fracture line 15d formed in the resin molded product 15 can be quickly and accurately determined at a plurality of locations using a conventional optical measuring device. Can be measured.

The shapes of the third wide portion 12c and the fourth wide portion 12d are not particularly limited as described above, but the second wide portion 12b is exemplified as shown in FIG. Assuming imaginary lines that cross the first wide part 12a in the horizontal direction, the two shapes obtained by cutting along the imaginary line may be in a symmetrical relationship with each other. More preferred.
Furthermore, when assuming a virtual line passing from the first wide part 12a through the second narrow part 11b toward the third wide part 12c, cut along the virtual line. More preferably, the two obtained shapes are in a symmetrical relationship with each other.

Similarly, when an imaginary line passing from the first wide portion 12a to the fourth wide portion 12d through the third narrow portion 11c is assumed, cutting is performed along the imaginary line. More preferably, the two shapes to be obtained are in a symmetrical relationship with each other.
That is, if the linear ribs 13 are in such a symmetrical relationship, the entire support base 10 can be used effectively, the planned fracture line 15d can be formed with high accuracy, and more Excellent invisible properties can be obtained.

In addition, the shapes of the second narrow portion 11b and the third narrow portion 11c are not particularly limited as described above. However, as illustrated in FIG. There may be two straight lines.

(Fifth to sixth wide portions and fourth to fifth narrow portions)
Moreover, as shown in FIG. 2 etc., it is preferable to have the 5th wide part 12e and the 6th wide part 12f at the edge part of the 2nd wide part 12b in fan shape or T shape, respectively.
And it has the 5th wide part 12e and the 6th wide part 12f in each of the end part of the 2nd wide part 12b which branched and expanded in the shape of a fan or T character in this way, and The fourth narrow portion 11d is provided between the end of the second wide portion 12b and the fifth wide portion 12e, and the other branched second portion The fifth narrow portion 11e is preferably provided between the end of the second wide portion 12b and the sixth wide portion 12f.

The reason for this is that the support 10 can be effectively used as a whole by adopting the form of linear ribs of a predetermined shape as described above, and can be applied to resin molded products 15 of various shapes and sizes. As a result, the planned fracture line 15d having a predetermined length and shape can be formed quickly and accurately.
Further, a fifth wide portion 12e and a sixth wide portion 12f are provided at the end of the second wide portion 12b, and the fourth narrow portion 11d is formed as a narrow portion between them. And since it has the 5th narrow part 11e, the fracture | rupture planned line 15d can be formed in the state which does not deform | transform the resin molded product 15 excessively. Accordingly, it is possible to reduce the occurrence of residual stress and excessive adhesion at a position corresponding to the narrow portion 11 of the resin molded product 15.
In addition, the depth of the planned fracture line 15d formed in the resin molded product 15 can also be measured quickly and accurately at a plurality of locations by using a conventional optical measuring device.

The shapes of the fifth wide portion 12e and the sixth wide portion 12f are not particularly limited as described above, but as illustrated in FIG. 1, the first wide portion 12a. Assuming imaginary lines crossing these in the horizontal direction from the second wide part 12b, the two shapes obtained by cutting along the imaginary line are in a symmetrical relationship with each other. Is more preferable.
Furthermore, if a virtual line extending from the second wide portion 12b through the fourth narrow portion 11d toward the fifth wide portion 12e is assumed, cut along the virtual line. More preferably, the two obtained shapes are in a symmetrical relationship with each other.

Similarly, when an imaginary line passing from the second wide part 12b through the fifth narrow part 11e toward the sixth wide part 12f is assumed, it is obtained by cutting along the virtual line. More preferably, the two shapes are symmetrical with each other.
That is, with such a linear rib 13, the entire support base 10 can be effectively utilized, and excellent invisibility can be obtained.
Moreover, in the case of the linear rib 13 having such a configuration, the depth of the planned fracture line 15d formed in the resin molded product 15 can be quickly and at a plurality of locations using a conventional optical measuring device. It is also possible to measure with high accuracy.

In addition, the shapes of the fourth narrow portion 11d and the fifth narrow portion 11e are not particularly limited as described above. However, as illustrated in FIG. Or it may be two straight lines.

(Width of narrow part and width of wide part)
Further, as shown in FIG. 2 and the like, the width (W1) of the narrow portion 11 (11a to 11e) constituting a part of the linear rib 13 is set to a value within the range of 1 to 10 mm, and the wide portion 12 (12a It is preferable to set the width (W2) of ˜12f) to a value within the range of 20 to 100 mm.
The reason for this is that, by limiting the dimensions in this way, the pressing force of the narrow portion 11 against the resin molded product 15 is further increased, and the portion corresponding to the narrow portion 11 is mainly curved in a convex shape. This is because the planned fracture line 15d can be formed with high accuracy, and the accuracy of the depth of the planned fracture line 15d can be further increased.
In addition, at a predetermined location of the resin molded product 15 with respect to such a narrow portion 11, the planned fracture line 15 d is opened in a V shape and the depth thereof is accurately measured using a measuring device such as a laser. There is also an advantage of being able to.

Therefore, the width (W1) of the narrow portion 11 constituting the linear rib 13 is more preferably set to a value within the range of 2 to 8 mm. Similarly, the wide portion 12 constituting a part of the linear rib 13 is used. The width (W2) is more preferably in the range of 22 to 80 mm.
Note that the widths of the first to fifth narrow portions 11a to 11e and the widths of the second to sixth wide portions 12a to 12f are the same in the shape of one or two straight lines described above. It may be present or different.

(Height of narrow part and height of wide part)
Further, as shown in FIG. 2 and the like, the height of the narrow portion 11 (11a to 11e) constituting a part of the linear rib 13 from the surface of the support base 10 is within a range of 0.1 to 5 mm. Similarly, the height of the wide portion 12 (12a to 12f) is preferably set to a value within the range of 0.1 to 5 mm.
The reason for this is that by restricting the height of the linear rib 13 in this way, the pressing force of the narrow portion 11 against the resin molded product 15 is further increased, and the portion corresponding to the narrow portion 11 is mainly convex. This is because the planned fracture line 15d can be formed with high accuracy, and further, the accuracy of the depth of the planned fracture line 15d can be further increased.
Moreover, if the width of the narrow portion 11 and the height of the wide portion 12 are such, even after the resin molded product 15 is pressed, the occurrence of residual stress is further reduced and the invisibility is improved. Because.
Therefore, the height of the narrow portion 11 constituting a part of the linear rib 13, that is, the height from the surface of the support base 10 is more preferably set to a value in the range of 0.5 to 5 mm. More preferably, the value is in the range of 8 to 3 mm.
Similarly, the height of the wide portion 12 constituting a part of the linear rib 13 is more preferably set to a value within a range of 0.5 to 5 mm, and a value within a range of 0.8 to 3 mm. Is more preferable.
In addition, the height of the narrow part 11 which comprises the linear rib 13, and the height of the wide part 12 may be the same, and may be different height.
In addition, the heights of the narrow portions 11 and the wide portions 12 constituting the linear ribs 13 may be average values, and the linear ribs 13 are matched to the shape of the resin molded product 15. It is also preferable to change the height and incline along the length direction and the width direction.

(Chamfer of narrow part and wide part)
Although not shown, it is preferable to chamfer the pressing surface of the linear rib 13 with the resin molded product 15.
The reason for this is that, by chamfering the pressing surface of the linear rib 13 with the resin molded product 15, the pressing force of the narrow portion 11 against the resin molded product 15 is further increased and corresponds to the narrow portion 11. This is because the portion that has been cut can be bent mainly in a convex shape, and as a result, the planned fracture line 15d can be formed with high accuracy, and further, the accuracy of the depth of the planned fracture line 15d can be further increased. .
In addition, by providing such a chamfer, when the resin molded product 15 is pressed, the occurrence of residual stress is reduced and the invisibility is improved.
Therefore, the chamfer width of the pressing surface of the linear rib 13 with the resin molded product 15 is preferably set to a value within a range of 0.01 to 1.0 mm, and a value within a range of 0.05 to 0.5 mm. It is more preferable to set the value within a range of 0.1 to 0.3 mm.

(Cross sectional shape of linear rib)
Although not shown, when the linear ribs 13 on the support base 10 are horizontally arranged and cut in the direction of gravity, the cross-sectional shape when viewed from the lateral direction is triangular, quadrilateral, Various shapes such as a pentagon, a trapezoid, an ellipse, and an irregular shape can be used, but a trapezoid or an ellipse is more preferable.
This is because if such a trapezoid or ellipse is used, the residual stress is reduced when the resin molded product 15 is pressed, and the invisibility is improved.
Moreover, if the cross-sectional shape of the linear rib 13 is trapezoidal in this way, even if the chamfering described above is omitted, the residual stress generated when the resin molded product 15 is pressed can be reduced. This is because it can.
In the case of a trapezoidal cross-sectional shape that is convex upward on the support base 10, as an example, the upper side has a value in the range of 1.0 to 1.8 mm, and the lower side has a value in the range of 1.9 to 3 mm. And the height is preferably in the range of 0.3 to 1.8 mm.

(Suction part around the linear rib)
It is preferable that a plurality of suction ports 14 connected to a suction device (not shown) are provided on the support base 10 and around the assumed position of the linear rib 13.
And the number per unit area of the suction ports 14 provided around the narrow portion 11 may be made larger than the number of the suction ports 14 per unit area provided around the wide portion 12. preferable.
The reason for this is that, by carrying out in this way, the pressing force of the resin molded product 15 against the narrow portion 11 can be increased, and the accuracy of the depth of the planned fracture line can be further increased. This is because the planned fracture line formed in (1) can be opened in a V shape and the depth thereof can be accurately measured.
Therefore, more specifically, the number of suction ports 14 provided around the narrow portion 11 is set to a value within the range of 10 to 50 per unit area (100 cm ² ), and similarly, The number of suction ports 14 provided around the portion 12 is preferably set to a value in the range of 1 to 8.

(2) -4 Scheduled Break Line Forming Unit Further, as shown in FIG. 5, each planned break line forming unit 131, 133 is provided with at least one machine tool (such as a machining blade).
As such a machine tool, for example, at least one processing blade such as an end mill, a thermal melting blade, an ultrasonic cutter, or a laser cutter, a processing member, or the like can be preferably used.
That is, with these machine tools, Joule heat is efficiently removed by the air (high-speed air) blown from the air outlet of the air blowing device even if the temperature becomes high due to long-term use or the like. Because it can.

Moreover, as shown in FIG. 5, it is also preferable to provide a primary fracture planned line forming means 131 and a secondary fracture planned line forming means 133, respectively, as the planned fracture line forming means.
Here, as shown in FIG. 6A, the primary fracture intended line forming means 131 forms the planned fracture line 15d in the case of a vehicle interior member (airbag door portion) made of only the resin molded product 15. It becomes the processing means for doing.
That is, a processing means for forming a planned fracture line 15d having a predetermined thickness (t1) that is partially cut from the back side of the resin molded product 15 having a predetermined thickness (t2) but does not reach the surface side ( Primary fracture intended line forming means).
The predetermined thickness (t2) of the resin molded product 15 is usually in the range of 1.0 to 2.5 mm, and the predetermined thickness (t1) of the remaining resin molded product that does not reach the surface side is usually The value is in the range of 0.1 to 0.8 mm, more preferably in the range of 0.2 to 0.7 mm, and the value in the range of 0.3 to 0.6 mm. Is more preferable.

On the other hand, as shown in FIG. 6 (b), the resin molded product 15 has a three-layer structure formed of a hard base material 15d ', an intermediate layer (foamed layer) 15e', and a skin 15f '. In the case of the product 15 ′, it is a processing means for forming a planned primary fracture line that penetrates the hard base material 15 d ′ from the hard base material 15 d ′ side but does not reach the skin 15 f ′.
The predetermined thickness (t3) of the remaining skin 15f ′ that does not reach the surface side is usually in the range of 0.1 to 0.8 mm, but a value in the range of 0.2 to 0.7 mm. It is more preferable to set the value within the range of 0.3 to 0.6 mm.
And as such a primary fracture planned line formation means, an end mill, a hot-melting blade, an ultrasonic cutter, a laser cutter, etc. can be used conveniently.

On the other hand, the airbag breaking planned line forming apparatus 100 shown in FIG. 5 allows a machine tool (sometimes referred to as a machining blade) 113 to enter the secondary breaking line reaching the skin 15f ′ through the primary breaking planned line. As a processing means for forming the planned line (thickness t3), it is preferable that the secondary fracture planned line forming means 133 is provided.
Therefore, the machine tool (for example, a laser cutter, an ultrasonic cutter, etc.) 113 included in the secondary break planned line forming unit 133 is formed in an elongated plate shape as a whole, and is included in the primary break planned line forming unit 131. It is made possible to enter the inside of the planned primary fracture line formed by a machine tool (for example, an end mill).

In the airbag break planned line forming apparatus 100, the primary break planned line forming means 131 and the secondary break planned line forming means 133 are both fixed to a fixing portion 163 a of the planned break line forming means in the movement control robot 163. .
Accordingly, when forming the planned primary fracture line, the movement control robot 163 operates to perform a predetermined cutting operation while positioning the hard base material 15d ′ in a state where it can be cut by the primary fracture planned line forming means 131. Do.
Next, when forming the planned secondary fracture line, a predetermined cutting operation is performed in a state where the skin 15 f ′ can be cut by the secondary fracture planned line forming means 133.

(2) -5 Cutting Edge Detection Unit In the airbag break planned line forming device 100, the depth of the groove to be formed is controlled by controlling the position of the cutting edge by the machine tool 131a constituting a part of the primary fracture planned line forming unit 131. That is, in order to adjust the thickness of the remaining part of the resin molded product (base material), an optical measuring device (laser reflection type laser displacement meter, etc.) for measuring the depth of the primary fracture line on-time. Is preferably provided.
On the other hand, although not shown, a first working blade detecting means and a second working blade for detecting the position of the cutting edge of a machine tool constituting a part of the secondary fracture planned line forming means 133 below the support base 10. It is preferable to provide each of the detection means.
The first processing blade detection unit and the second processing blade detection unit are arranged inside the support base 10 and configured to detect the presence / absence of a machine tool at a predetermined specific detection position. ing.
And as such 1st processing blade detection means 167 and 2nd processing blade detection means 169, for example, a metal detector is suitable, and, thereby, the metal machine tool passed the detection position. Sometimes the presence or absence of a machine tool can be detected.

(2) -6 Cutting Edge State Detection Unit The cutting edge state detection unit 129 is a unit for detecting the state of wear or damage of the cutting edge or cutting part of a machine tool (processing blade or the like).
Therefore, when the state of the cutting edge of the processing blade is measured and a state damaged by wear or the like is detected, the operation of the apparatus is stopped and the processing blade or the like can be replaced.
That is, by using the blade edge state detecting means, the machine tool can be maintained in a predetermined state, and the thickness of the remaining portion of the planned airbag break line to be formed can be adjusted with higher accuracy.

Specifically, the cutting edge state detection means is configured using a laser displacement meter, an infrared measurement device, or the like, and detects the cutting edge state of the machining blade while maintaining the tip of the movement control robot 163 at a predetermined height. Detecting the degree of damage due to wear or the like by measuring the difference in the height position of the blade edge before and after the formation of the airbag rupture line and the difference in the shape of the shadow, arranged at the detection position of the means 129 Can do.
By providing such a blade edge state detecting means 129, the distance between the blade edge of the machining blade and the mounting surface of the support base 10 can be kept constant in consideration of the blade surface state of the machining blade. Even when the type, thickness, etc. of the air bag change, it is possible to accurately and quickly form a planned airbag break line in which the remaining thickness is uniform throughout.

(3) Resin molded product The configuration type of the resin molded product 15 is not particularly limited. For example, polyethylene resin, polypropylene resin, polystyrene resin, polyester resin, polycarbonate resin, polyurethane resin, polyamide resin, poly Synthetic resins such as vinyl chloride resin and polysulfone resin, gold, silver, copper, platinum, nickel, titanium, aluminum, zinc, iron, lead, cadmium, tungsten, indium, molybdenum and other metals (including alloys), silver oxide, Copper oxide, silicon oxide, nickel oxide, titanium oxide, aluminum oxide, zinc oxide, iron oxide, lead oxide, cadmium oxide, tungsten oxide, indium oxide, molybdenum oxide, glass, ceramic and other oxides, water such as aluminum hydroxide Oxides, ceramic materials, and this Examples thereof include three-dimensional molded articles and films made of these composites and mixtures.

[Second Embodiment]
The second embodiment is a machining method for forming a planned fracture line that does not reach the surface with a machine tool on a resin molded product as a resin molded product, and includes the following steps (1) to (3): It is the machining method characterized by having.
(1) A step of placing the resin molded product on a support base provided with a linear rib that curves the resin molded product in a convex shape. (2) The resin molded product is placed on the linear rib by a suction device. Step of pressing and bending in a convex shape (3) Step of forming a planned fracture line for a resin molded product curved in a convex shape on a linear rib by a machine tool As an example, a machining method for a resin molded product according to the second embodiment will be described.

1. Process (1)
Step (1) is a step of placing the resin molded product in a substantially horizontal state on a support base provided with predetermined linear ribs.
However, when the linear rib is fixed to the support base in advance, the resin molded product may be partially curved in a convex shape due to the influence of the linear rib having a predetermined height.
On the other hand, in the case where the linear rib is configured to move in the vertical direction, since the linear rib is located inside the support base, the resin molded product can substantially maintain a horizontal state.

2. Step (2)
Next, in the step (2), the resin molded product 15 is pressed against the linear rib 13 protruding in a fixed state on the support base 10 by a suction device, and curved into a convex shape as a predetermined shape. It is a process to make.
That is, a suction operation is performed by the suction port 14 provided at a predetermined position on the support base 10 or a suction device connected thereto, whereby the resin molded product 15 is fixed on the support base 10. This is a step that can be pressed onto the protruding linear rib 13 and, consequently, curved into a convex shape.

When the linear rib 13 is configured to move up and down in the support base 10, first, the linear rib 13 rises from the support base 10 to a predetermined position protruding from the surface of the support base 10. To perform the operation.
Next, after the operation is completed or in the middle of the operation, the resin molded product 15 is pushed down by the suction device and pressed against the linear rib 13 to be curved into a convex shape as a predetermined shape. It will be.

3. Process (3)
Next, the step (3) is a step of forming a predetermined planned fracture line 15d on the linear rib 13 by using a cold cutter or the like on the resin molded product 15 curved in a convex shape.
At this time, as described above in part, a plurality of suction ports 14 connected to the suction device are provided on the support 10, and the suction ports 14 per unit area provided around the narrow portion 11. The number is preferably larger than the number of suction ports 14 per unit area provided around the wide portion 12.
The reason for this is that, by carrying out in this way, the pressing force of the resin molded product 15 against the narrow portion 11 can be increased, and the accuracy of the depth of the planned fracture line 15d can be further increased. This is because the planned fracture line 15d formed on the resin molded product 15 corresponding to 11 can be opened in a V shape and the depth thereof can be measured with high accuracy.

In carrying out the step (3), the support base 10 having the linear ribs 13 is used, the width (W1) of the formation in the narrow portion 11 is set to a value within the range of 1 to 10 mm, and the width (W2) of the wide portion. ) Is preferably in the range of 20 to 100 mm.
The reason for this is that by configuring the width of the linear rib 13 in this way, the pressing force of the resin molded product 15 against the narrow portion 11 is increased, and the accuracy of the depth of the planned fracture line 15d can be further increased. Furthermore, the planned fracture line 15d formed in the resin molded product 15 for the narrow portion 11 can be opened in a V shape, and the depth thereof can be measured with high accuracy.

When using the support base 10 having the linear ribs 13, the height of the linear ribs 13 (the narrow portion 11 and the wide portion 12) is set to the surface of the support base as described in the first embodiment. Therefore, the value is preferably in the range of 0.1 to 5 mm, more preferably in the range of 0.5 to 5 mm, and further preferably in the range of 0.8 to 3 mm. preferable.

4). Step (4)
Finally, as the step (4), it is preferable to provide a step of measuring the depth of the planned fracture line 15d in the resin molded product 15 by the processing blade using a predetermined sensor.
That is, this is a step of measuring the depth of the planned fracture line 15d on the back surface of the resin molded product 15 or the thickness of the remaining portion.
Here, the thickness of the remaining portion of the planned fracture line 15d, that is, the depth measurement method is not particularly limited. For example, a laser light measurement system, an infrared measurement system, or an eddy current method is adopted. Is preferred.

More specifically, it is preferable to measure the depth (or remaining thickness) of the planned fracture line 15d at least at two or more locations by using reflection of laser light or eddy current, and measurement at three or more locations. More preferably.
The reason for this is that, by measuring the film thickness at a plurality of locations in this way, an averaged numerical value can be obtained even when the thickness of the molded skin is somewhat uneven.
Therefore, it is possible to form a planned break line having a uniform film thickness as a whole, and therefore, when an airbag deployment force is generated, the airbag door can be reliably opened along the planned break line. .
It is preferable to measure the thickness of the molded skin before forming the planned fracture line on the skin as a resin molded product, that is, measure the film thickness before and after forming the planned fracture line.
The reason for this is that by measuring the film thickness before and after the formation of the planned fracture line, it is possible to form the planned fracture line with a more uniform film thickness as a whole, and the deployment force of the airbag is reduced. This is because, when it occurs, the airbag door can be more reliably opened along the planned fracture line.

5). Other Steps Since the formed planned fracture line (groove) 15b may be instantaneously fused, the silicone resin is pressed in a state where the resin molded product 15 is pressed against the linear rib 13 having a predetermined shape and opened and closed in a V shape. Fluorine resin, olefin resin or the like is preferably sprayed.
If it does so, the fusion | bonding of the formed planned fracture line (groove) 15b can be prevented, and by extension, the planned fracture line (groove) 15b etc. can be measured accurately.

[Example 1]
1. Formation of a scheduled break line for an airbag As shown in FIG. 5, the airbag breaks, which is a machining apparatus (machine tool: cold cutter) having a support base 10 provided with the linear ribs 13 shown in FIGS. The planned line forming apparatus 100 was prepared.
Next, continuous operation is performed for 1 to 300 hours, and a thermoplastic elastomer resin molded product (width: 1.2 mm, length: 40 cm, thickness: 2) constituting the airbag apparatus as shown in FIG. 6 (a). 0.0 mm) 15, a predetermined depth (air bag breakage planned line 15 d) was formed, and the following evaluation was performed.

2. Evaluation (1) Invisible property The resin molded product of the obtained airbag apparatus was visually observed, and the invisible property was evaluated according to the following criteria.
A: From the surface side of the resin molded product, the airbag expected break line cannot be recognized in the range of −80 to 80 ° with respect to the normal direction.
◯: The airbag expected break line cannot be recognized in the range of −60 to 60 ° with respect to the normal direction from the surface side of the resin molded product.
Δ: The airbag expected break line cannot be recognized in the range of −40 to 40 ° with respect to the normal direction from the surface side of the resin molded product.
×: From the surface side of the resin molded product, the expected airbag break line can be recognized in the range of −40 to 40 ° with respect to the normal direction.

(2) Processing accuracy For the formation of the expected airbag break line, the depth (remaining film thickness) of the expected airbag break line formed on the back side of the resin molded product after continuous operation for 12 hours is measured with a laser displacement meter. The machining accuracy was evaluated according to the following criteria.
In addition, when the appearance of the air bag planned break line was observed using an optical microscope (after 12 hours of operation), in the case of evaluation, a sharp cutting shape was accurately formed on the back surface of the resin molded product. I also confirmed.
(Double-circle): The depth of the airbag break planned line formed after continuous operation for 12 hours is a value within the range of 1.2 mm ± 0.2 mm.
◯: The depth of the planned airbag break line formed after 12 hours of continuous operation is a value within the range of 1.5 mm ± 0.2 mm.
(Triangle | delta): The depth of the airbag break planned line formed after 12-hour continuous operation is a value within the range of 1.5 mm +/- 0.5mm.
X: The value of the planned airbag break line formed after continuous operation for 12 hours exceeds 1.5 mm ± 0.5 mm.

(3) Resin molded product exchangeability For the formation of the expected airbag rupture line, continuous operation is performed for 1 to 12 hours, and the resin molded product is replaced with a new resin molded product every hour. Thus, the replaceability of the resin molded product was evaluated.
A: The resin molded product can be easily detached from the support base and can be replaced within 15 seconds.
○: The resin molded product is slightly stuck to the support base, but can be replaced within 20 seconds.
(Triangle | delta): The resin molded product has adhered to the support stand comparatively strongly, and cannot be replaced within 30 seconds.
X: The resin molded product is firmly attached to the support base and cannot be replaced within one minute.

(4) Durability of the cold cutter For the formation of the planned airbag break line, continuous operation is performed for 1 to 300 hours, and after a predetermined time, the depth of the planned break line formed on the back side of the resin molded product (the remaining film Thickness) was measured using a laser displacement meter, and the durability of the cold cutter was evaluated according to the following criteria.
A: Even after 300 hours of continuous operation, the depth of the planned fracture line is a value within the range of 1.2 mm ± 0.2 mm.
○: Even after 100 hours of continuous operation, the depth of the planned fracture line is a value within the range of 1.2 mm ± 0.2 mm.
(Triangle | delta): If it is after a continuous operation for 12 hours, the depth of a planned fracture line is a value within the range of 1.2 mm +/- 0.2 mm.
X: After continuous operation for 1 hour, the depth of the planned fracture line exceeds 1.2 mm ± 0.2 mm.

[Comparative Example 1]
In Comparative Example 1, a conventional airbag break planned line forming apparatus (machine tool) provided with a support base having linear linear ribs having a width of 2 mm and linear ribs having Y-shaped branches at both ends. : Cold cutter).
As a result, the invisible property, the processing accuracy, the exchangeability, and the durability of the cold cutter were evaluated in the same manner as in Example 1 except that the planned break line for the airbag was formed.

According to the machining apparatus of the present invention, a machine tool for forming a planned fracture line, a support base on which the resin molded product is placed, and the resin molded product on the support base are convex. A linear rib that is curved, and the linear rib has a narrow part having a relatively narrow width and a wide part having a relatively wide width, and by a suction device, When the resin molded product is pressed against the linear rib, it is curved in a convex shape mainly at a location corresponding to the narrow portion, thereby suppressing the occurrence of residual stress in the narrow portion of the resin molded product, As a result, excellent invisible properties can be obtained.

Further, the depth of the planned fracture line formed in the resin molded product can also be measured quickly and accurately using a conventional optical measurement device at a location corresponding to the narrow portion.
That is, by using a linear rib having a certain shape to form a planned fracture line for a resin molded product, the planned fracture line is sufficiently open in a V shape for measurement. It does not affect the depth measurement of the planned fracture line.

In addition, it seems to be due to the shape of the linear ribs, but since the narrow part is in close contact with the resin molded product, it is possible to replace the resin molded product after forming the planned fracture line in a short time Became.
Furthermore, when using a machining device with linear ribs of a specific shape, the processing blade (cold cutter) can be cut quickly and broken at a relatively flat point, with a moderately curved convex shape. Although it seems to form the planned line, the durability of the machining blade has been remarkably improved.

10: Support base 11 (11a to 11e): Narrow part 11 ': Narrow part 12 (12a to 12f) of conventional linear rib: Wide part 13: Linear rib 13': Conventional linear rib 14: Suction port 15, 15 ': Resin molded product (base material)
15a, 15a ':
15b, 15b ′:
15c, 15c ′:
15d: planned break line (airbag break planned line)
15d ': hard base material 15e': intermediate layer 15f ': skin 16: fixing hole 17: annular groove 40: air bag door member 41': another air bag door member 100: machining apparatus (formation of a planned break line of an air bag) apparatus)
113: Machine tool (machining blade)
116: Movement control unit 129: State detection means 131: Primary break planned line forming means 133: Secondary break planned line forming means 163: Movement control robot

Claims (8)

1. For a resin molded product that is a resin molded product, a machining device that forms a planned fracture line that does not reach the surface,
   A machine tool for forming the planned fracture line for the resin molded product,
   A support table on which the resin molded product is placed;
   On the support base, linear ribs that curve the resin molded product in a convex shape,
   With
   The linear ribs each have a relatively narrow width portion and a relatively wide width portion;
   In addition, when the resin molded product is pressed against the linear rib by a suction device, at least a portion of the resin molded product corresponding to the narrow portion is curved in a convex shape.
2. The wide portion has at least a first wide portion and a second wide portion, and has the narrow portion between the first wide portion and the second wide portion, and the first wide portion The machining apparatus according to claim 1, wherein the wide portion, the narrow portion, and the second wide portion are arranged linearly.
3. Each of the end portions of the first wide portion that branches and expands in a fan shape or a T shape has a third wide portion and a fourth wide portion, and one of the branched portions, A second narrow portion is provided between the end of the first wide portion and the third wide portion, and the other end of the first wide portion branched. 3. The machining apparatus according to claim 2, wherein a third narrow portion is provided between the fourth wide portion and the fourth wide portion.
4. Each of the end portions of the second wide portion that is branched and widened in a fan shape or a T shape has a fifth wide portion and a sixth wide portion, and one of the branched portions, A fourth narrow portion is provided between the end of the second wide portion and the fifth wide portion, and the other end of the second wide portion branched. The machining apparatus according to claim 2, wherein a fifth narrow portion is provided between the sixth wide portion and the sixth wide portion.
5. The width (W1) of the narrow portion is set to a value within a range of 1 to 10 mm, and the width (W2) of the wide portion is set to a value within a range of 20 to 100 mm. The machining apparatus according to any one of the above.
6. A plurality of suction ports connected to the suction device are provided on the support base, and the number of suction ports provided around the narrow portion is determined by the number of suction ports provided around the wide portion. The machining apparatus according to any one of claims 1 to 5, wherein the number of the machining apparatuses is also increased.
7. The resin molded product is an automobile interior member, the machine tool is a cold cutter, and the planned break line is a planned break line for an airbag. The machining apparatus according to any one of the above.
8. A machine processing method for forming a planned fracture line that does not reach the surface with a machine tool on a resin molded product that is a resin molded product, comprising the following steps (1) to (3): Processing method.
   (1) A step of placing the resin molded product on a support base provided with linear ribs for curving the resin molded product in a convex shape. (2) The resin molded product is formed into the linear shape by a suction device. The step of pressing the rib onto the resin molded product corresponding to at least the narrow portion in a convex shape (3) The resin molded product curved in a convex shape on the linear rib by the machine tool For forming the planned fracture line

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