JP6295973B2 - Setting method of target support position of interior member by jig - Google Patents

Description

  The present invention is applied to a jig that supports an interior member, and relates to a method for setting a target value of a support position when the interior member is supported by the jig.

  Patent Document 1 discloses a vehicle ceiling member. The ceiling member described in Patent Document 1 includes a base material formed of urethane foam and a reinforcing layer formed of glass fiber and attached to the design surface side and the back surface side of the base material. . Further, a skin material formed of a nonwoven fabric or the like is stuck to the reinforcing layer on the design surface side, and this skin material forms a ceiling surface in the vehicle interior. Moreover, the back surface material is affixed on the reinforcement layer of the back surface side.

  When such a ceiling member is placed on a conveying jig, a so-called cushion material made of chip urethane is attached to the back surface of the ceiling member, or a functional component such as a duct is assembled. Thereafter, the ceiling member is moved together with the jig through the opening of the front window of the vehicle and directly below the roof panel, and assembled to the roof panel.

Japanese Patent Application Laid-Open No. 2014-118032

  By the way, in recent years, the thickness of the ceiling member has been reduced for the purpose of reducing the weight of the vehicle and reducing the cost, and as a result, the rigidity of the ceiling member tends to be lowered. Therefore, when a cushion material is affixed to the ceiling member placed on the jig, the ceiling member may be broken when a load is applied.

Such a problem is not limited to the jig that supports the ceiling member, and may occur in the same manner in jigs that support other interior members.
The objective of this invention is providing the setting method of the target support position of the interior member by the jig | tool which can design easily the jig | tool which can suppress the bending of an interior member.

A method for setting a target support position of an interior member using a jig for achieving the above object is applied to a jig for supporting the interior member, and a method for setting a target support position when the interior member is supported by the jig. And the said interior member is the 1st reinforcement layer stuck on the base material formed with the foaming molding, the design surface side of the base material, and the back surface side of the base material. 2 is formed of a composite material including a reinforcing layer, the folding limit load of the interior member is Fc, the thickness of the interior member is T, the basis weight of the first reinforcement layer is W1, and the interior A half value of the distance ΔD between the support points on which the member is supported is a support pitch, and correction coefficients of T, W1, and ΔD are positive values K1, positive values K2, and negative values, respectively. When K3 is the value and the constant term is C1, Fc, T, W1, ΔD And based on the regression equation (1) holds between the C1, it sets the target support position.

Fc = K1 × T + K2 × W1 + K3 × ΔD + C1 (1)

Based on the correction coefficients K1 to K3 in the regression equation (1), the thickness T of the interior member, the basis weight W1 of the first reinforcing layer, and the term of the support pitch of the interior member (term of ΔD) are the bending limit loads of the interior member. It is possible to grasp the fact that it is dominant in Fc and the degree of contribution of these terms in the folding limit load Fc. Therefore, according to the above method, by setting the target support position by the jig based on the regression equation (1), the interior member can be mounted by assembling other members while being placed on the jig. Breaking can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the jig | tool which can suppress the bending of an interior member can be designed easily.

The top view of the state in which the assist grip etc. were assembled | attached about the ceiling member which concerns on one Embodiment. Sectional drawing of the said ceiling member. The schematic of the testing machine for the rigidity evaluation of a ceiling member. The graph which shows the relationship between the displacement amount of the pushing jig | tool at the time of pressing a ceiling member with a pushing jig, and the load applied to a ceiling member from the pushing jig. It is sectional drawing of the modeled ceiling member, Comprising: (a) is sectional drawing of the state in which the load is not acting, (b) is sectional drawing of the state which a fold produced. The perspective view of the ceiling member of the state supported by the jig | tool which concerns on the said embodiment. The fragmentary sectional view of the ceiling member in the state supported by the jig.

  Hereinafter, an embodiment will be described with reference to FIGS. In the present embodiment, a ceiling member 10 attached to the lower surface of a vehicle roof panel and a design method thereof will be described as an example of an interior member.

  As shown in FIG. 1, the ceiling member 10 is assembled to the lower surface of a roof panel (not shown) of the vehicle, and has a substantially flat plate shape along the lower surface. The ceiling member 10 has a different thickness depending on the part. Functional components such as a lamp 21 for lighting in the vehicle interior, an assist grip 22, and a sun visor 23 are assembled to the ceiling member 10.

Next, the cross-sectional structure of the ceiling member 10 will be described.
As shown in FIG. 2, the ceiling member 10 includes a base material 11 formed of urethane foam that is a foam molded body.

  A first reinforcing layer 12 formed of a glass mat is bonded to the design surface side (the lower side of the figure) of the substrate 11 with an adhesive (not shown). Further, a skin material 13 formed of a nonwoven fabric is bonded to the design surface side of the first reinforcing layer 12 with an adhesive (not shown). The glass mat is obtained by forming glass fibers into a sheet shape.

  A second reinforcing layer 14 formed of a glass mat is bonded to the back side of the substrate 11 (upper side in the figure) with an adhesive (not shown). Further, a back material 15 formed of a nonwoven fabric is bonded to the back surface side of the second reinforcing layer 14 with an adhesive (not shown).

In this embodiment, a urethane resin adhesive is used.
As shown in FIG. 6, the ceiling member 10 is placed on the conveying jig 40 prior to assembly to the roof panel, and a so-called cushioning material made of chip urethane (not shown) is placed on the back surface thereof. Is pasted. The jig 40 includes a plate 41 and an attachment 42 that is fixed to the plate 41 and supports a predetermined portion of the lower surface of the ceiling member 10.

Thereafter, the ceiling member 10 is moved directly below the roof panel through the opening of the front window of the vehicle together with the jig 40, and is assembled to the roof panel.
When a cushion material is affixed to the ceiling member 10 placed on the jig 40, a load greater than or equal to the folding limit load Fc of the part may act.

  Therefore, the thickness of each part is designed so that the folding limit load Fc of the part is larger than the load acting on the part of the ceiling member 10 when the parts are assembled to the ceiling member 10. If it does so, it will be thought that generation | occurrence | production of the bending of the ceiling member 10 can be suppressed suitably.

In addition, it is possible to grasp | ascertain distribution of the load which can act with respect to the ceiling member 10 in the case of an assembly | attachment etc. through the well-known analysis by CAE (Computer Aided Engineering).
Next, a method for evaluating the rigidity of the ceiling member 10 will be described.

  As shown in FIG. 3, the testing machine 31 has a pair of support jigs 32 that are spaced apart from each other on a horizontal plane, and a test piece 35 of the ceiling member 10 supported on each support jig 32. A pressing jig 33 capable of applying a load from above at a central position between the same pair of supporting jigs 32 is provided.

  When the ceiling member 10 is pressed by the pressing jig 33, as shown in FIG. 4, the load acting on the ceiling member 10 increases as the pressing amount by the pressing jig 33, that is, the displacement amount of the pressing jig 33 increases. growing. However, when the load acting on the ceiling member 10 reaches the folding limit load Fc of the ceiling member 10, the ceiling member 10 is bent.

The inventor of the present application measured the folding limit load Fc of the ceiling member 10 using the test machine 31 under a plurality of measurement conditions with different control factors.
That is, the thickness T of the ceiling member 10 which is a control factor, the basis weight W1 of the first reinforcing layer 12, the support pitch of the ceiling member 10, the presence / absence C of the ceiling member 10, the number N1 of the first reinforcing layers 12, the second The bending limit load Fc of the ceiling member 10 was measured under a plurality of measurement conditions in which the basis weight W2 of the reinforcing layer 14 and the number N2 of the second reinforcing layers 14 were different. The support pitch is a distance from one support jig 32 to the push jig 33, and is a value of ½ of the distance ΔD between the support points for supporting the ceiling member 10 by the pair of support jigs 32 (FIG. 3). Further, when the ceiling member 10 is crushed in the thickness direction due to molding or the like, crushed is considered.

  In addition, as a glass mat which is the raw material of the reinforcement layers 12 and 14, there exists a thing with a predetermined | prescribed basis weight (for example, 70 g / m2, 100 g / m2, 135 g / m2). Therefore, by stacking a plurality of these original fabrics, various types of basis weight glass mats can be formed. For example, in the case of a glass mat with a basis weight of 200 g / m 2, two glass mats with a basis weight of 100 g / m 2 may be stacked. In the case of a glass mat with a basis weight of 270 g / m 2, two glass mats with a basis weight of 135 / m 2 may be stacked.

Then, by performing multiple regression analysis based on the measurement results of the bending limit load Fc of the ceiling member 10 under a plurality of measurement conditions, the objective variable Fc and the control factors T, W1, ΔD, C, N1, W2, N2, And a regression equation (2) established between ΔD and ΔD.

Fc = K1 * T + K2 * W1 + K3 * [Delta] D + K4 * C + K5 * N1 + K6 * W2 + K7 * N2 + C2 (2)

Here, the correction coefficients K1, K2, K5 to K7 are all positive values, and the correction coefficients K3 and K4 are negative values. C2 is a constant term. When the ceiling member 10 is crushed, “1” is substituted for C, and when the ceiling member 10 is not crushed, “0” is substituted for C.

Further, according to the regression equation (2), the ratio of each control factor term to the load acting on the ceiling member 10 is as follows.
Thickness T of the ceiling member 10: about 32%
Weight per unit area W1 of the first reinforcing layer 12: about 25%
Support pitch (ΔD) of ceiling member 10: about 30%
Whether the ceiling member 10 is crushed C: about 7%
Number of first reinforcing layers 12 N1: about 5%
Weight W2 of second reinforcing layer 14: about 0.1%
Number N2 of second reinforcing layers 14: about 0.7%
From these facts, regarding the terms of the number N1 of the first reinforcing layer 12, the basis weight W2 of the second reinforcing layer 14, and the number N2 of the second reinforcing layer 14, the ratio of these to the load acting on the ceiling member 10 is Compared with the terms of the thickness T of the ceiling member 10, the basis weight W1 of the first reinforcing layer 12, and the support pitch (ΔD) of the ceiling member 10, it can be said to be negligibly small.

When the ceiling member 10 is not crushed, the regression equation (2) can be expressed by the following regression equation (1).

Fc = K1 × T + K2 × W1 + K3 × ΔD + C1 (1)

Here, C1 is a constant term. That is, according to the regression equation (1), as the thickness T of the ceiling member 10 is increased and the basis weight W1 of the first reinforcing layer 12 is increased, the folding limit load Fc of the ceiling member 10 is increased. It can be said that the member 10 becomes difficult to break. Moreover, it can be said that the larger the support pitch (ΔD) of the ceiling member 10 is, the smaller the bending limit load Fc of the ceiling member 10 is, that is, the ceiling member 10 is more easily broken. On the other hand, it can be said that the basis weight W2 of the second reinforcing layer 14 hardly contributes to the bending limit load Fc of the ceiling member 10.

  Therefore, the ceiling member 10 is fixed by the jig 40 so that the bending limit load Fc at the part calculated based on the regression equation (1) is larger than the magnitude of the load acting on the part of the ceiling member 10. By setting the target support position when supporting, the jig 40 that can suppress the bending of the ceiling member 10 can be easily designed.

  When the regression equation (2) is derived, the basis weight of the base material 11 (urethane foam), the foaming rate of the urethane foam, the orientation of the glass fibers in the reinforcing layers 12 and 14 (glass fibers), the reinforcing layer 12, Since it is difficult to control the amount of the adhesive that bonds the substrate 14 to the substrate 11 and the reaction degree of the adhesive, it is considered as an error factor and is not included in the control factor.

  Next, a mechanism for causing the folding of the ceiling member 10 found by the inventor will be described. In addition, it demonstrates with reference to the cross-section of the modeled ceiling member 10 shown to Fig.5 (a), (b).

  As shown in FIG. 5B, when a load F acts on the skin material 13 that is the design surface of the ceiling member 10 from above, the substrate 11 is formed of a glass mat and is not easily deformed. A moment load is applied to the reinforcing layer 14 as a fulcrum X so that the portions on both sides of the center line indicated by the alternate long and short dash line are drawn toward the center line (see the two-dot chain line arrow).

  The base material 11 formed of urethane foam tries to bend by this moment load. However, since the first reinforcing layer 12 is formed of a glass mat and is not easily bent, the first reinforcing layer 12 can withstand the load Fc when the load F reaches the bending limit load Fc of the ceiling member 10. It breaks away. As a result, the ceiling member 10 yields.

  Here, when the thickness T of the ceiling member 10 is increased, the distance from the design surface (upper surface in the figure) to the fulcrum X increases, and the load transmitted to the fulcrum X decreases. For this reason, the moment load of the first reinforcing layer 12 can be reduced by reducing the moment load, and the breakage of the first reinforcing layer 12 is suppressed.

Moreover, when the fabric weight W1 of the 1st reinforcement layer 12 is enlarged, the fracture | rupture of the 1st reinforcement layer 12 is suppressed because the rigidity of the 1st reinforcement layer 12 is improved.
These are consistent with the knowledge obtained from the regression equation (2).

  As shown by a solid line in FIG. 7, in this embodiment, the target support position P for supporting the ceiling member 10 by the attachment 42 of the jig 40 is set based on the regression equation (1).

  For example, as shown by a two-dot chain line in the figure, when the position of the tip of the attachment 42 is P2, the cushion material 24 is attached by an operator's finger to attach the cushion material 24 to the upper surface of the ceiling member 10 with an adhesive. When pressed, the ceiling member 10 is bent from the tip.

  Here, if the attachment 42 is extended over the entire lower surface of the ceiling member 10, the ceiling member 10 can be prevented from being broken. However, in this case, a portion that does not need to be supported is supported by the attachment 42, and there is a problem that the physique of the attachment 42 becomes larger than necessary.

  In this respect, according to the present embodiment, the target limit load Fc at the part calculated based on the regression equation (1) is larger than the magnitude of the load acting on the part of the ceiling member 10. The support position is set. For this reason, the physique of the attachment 42 can be suppressed to the minimum within the range where the bending of the ceiling member 10 does not occur.

According to the method for setting the target support position of the interior member by the jig according to the present embodiment described above, the following effects can be obtained.
(1) Regression equation (1) established between the bending limit load Fc of the ceiling member 10, the thickness T of the ceiling member 10, the basis weight W1 of the first reinforcing layer 12, and the support pitch (ΔD) of the ceiling member 10. Based on the above, the target support position when the ceiling member 10 is supported by the jig 40 is set.

  Based on the correction coefficients K1 to K3 in the regression equation (1), the terms of the thickness T of the ceiling member 10, the basis weight W1 of the first reinforcing layer 12, and the support pitch (ΔD) of the ceiling member 10 are broken. It is possible to grasp the dominance in the limit load Fc and the contribution degree of these terms in the folding limit load Fc. Therefore, according to the above method, by setting the target support position by the jig 40 based on the regression equation (1), the ceiling can be obtained by assembling the cushion material 24 in a state of being placed on the jig 40. The member 10 can be prevented from being broken.

  (2) The target support corresponding to the part so that the folding limit load Fc at the part calculated based on the regression equation (1) is larger than the magnitude of the load acting on the part of the ceiling member 10. The position was set.

  According to such a method, since the folding limit load Fc at the part becomes larger than the load acting on each part of the ceiling member 10, the occurrence of folding can be appropriately suppressed over the entire ceiling member 10.

In addition, the said embodiment can also be changed as follows, for example.
-The base material 11 can also be formed with other foaming moldings, such as a polypropylene.
-The 1st reinforcement layer 12 and the 2nd reinforcement layer 14 should just be a thing harder to deform | transform than the base material 11, and can also employ | adopt the reinforcement layer formed with materials other than a glass mat.

  -The ceiling member 10 is not limited to what is mounted on the ceiling back surface of a vehicle, It can also apply with respect to a house. Further, the interior member can be applied to a wall surface other than the ceiling.

  DESCRIPTION OF SYMBOLS 10 ... Ceiling member (interior member), 11 ... Base material, 12 ... 1st reinforcement layer, 13 ... Skin material, 14 ... 2nd reinforcement layer, 15 ... Back material, 21 ... Lamp, 22 ... Assist grip, 23 ... Sun Visor, 24 ... cushion material, 31 ... testing machine, 32 ... support jig, 33 ... pushing jig, 35 ... test piece, 40 ... jig, 41 ... plate, 42 ... attachment.

Claims (4)

It is applied to a jig that supports an interior member, and is a method of setting a target support position when supporting the interior member by the jig,
The interior member includes a base material formed of a foam molded body, a first reinforcing layer attached to the design surface side of the base material, and a second reinforcing layer attached to the back surface side of the base material. Formed by a composite material containing
Fc is the bending limit load of the interior member,
The thickness of the interior member is T,
The basis weight of the first reinforcing layer is W1,
A value that is 1/2 of the distance ΔD between the support points on which the interior member is supported is a support pitch,
When the correction coefficients for T, W1, and ΔD are K1, which is a positive value, K2 which is a positive value, and K3 which is a negative value, respectively, and the constant term is C1,
Based on the regression equation (1) established between Fc and T, W1, ΔD, and C1, the target support position is set.

Fc = K1 × T + K2 × W1 + K3 × ΔD + C1 (1)

A method for setting a target support position of an interior member using a jig. The jig is to support the interior member having a different thickness depending on a part,
The target support position corresponding to the part is set so that the bending limit load at the part calculated based on the regression equation (1) is larger than the magnitude of the load acting on the part of the interior member. To
A method for setting a target support position of an interior member using the jig according to claim 1. The foam molding is urethane foam,
The first reinforcing layer and the second reinforcing layer are both sheet-like glass mats formed of glass fibers.
A method for setting a target support position of an interior member using the jig according to claim 1. The interior member is a vehicle ceiling member;
The setting method of the target support position of the interior member by the jig | tool as described in any one of Claims 1-3.