Forming die and manufacturing method of composite material

Abstract

The present invention is a molding die for molding a composite material having a metal member and a resin member joined to the metal member, the molding die comprising: a die main body having an internal space formed therein; the inner space includes a first space into which the metal member is inserted and a second space which is a cavity for molding the resin member. A first temperature sensor; and a second temperature sensor in which a surface exposed to the second space when the metal member is inserted into the first space is a joining surface, and a surface that coincides with the joining surface in position when the metal member is not inserted into the first space is a virtual surface. The first temperature sensor faces the first space present in a projection range of the imaginary plane in a normal direction of the imaginary plane, and the second temperature sensor faces the second space present in the projection range of the imaginary plane.

Description

Technical Field

[0001] The invention relates to a molding die and a manufacturing method of a composite material. Background Art

[0002] The following patent document 1 describes a method for manufacturing a composite material. The composite material is manufactured by joining a metal component and a resin component by injection molding. A space for inserting the metal component and a space for injecting the resin are formed in a mold used in the manufacturing method. In addition, a temperature sensor is provided in the space for injecting the resin. The manufacturing method adjusts the parameters of the molding machine based on the detection result of the temperature sensor. Moreover, patent document 1 discloses an estimation device for estimating the bonding strength between the metal component and the resin component. The bonding strength between the metal component and the resin component is estimated by the surface roughness of the metal component. The estimation device suppresses manufacturing defects by estimating the bonding strength before manufacturing the composite material.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2022-35285 Summary of the invention

[0006] Problems to be solved by the invention

[0007] It is believed that the bonding strength between the metal component and the resin component in the composite material is also affected by the temperature change in the mold during molding, for example, the temperature at the joint between the metal component and the resin component. The technology described in Patent Document 1 measures the temperature only at one point of the molding mold far away from the joint, so it is difficult to grasp the temperature of the joint.

[0008] An object of the present disclosure is to provide a molding die and a manufacturing method for a composite material that can grasp the temperature of a joint portion between a metal member and a resin member.

[0009] Means for solving problems

[0010] (1) A molding die for a composite material disclosed herein is a molding die for molding a composite material, wherein the composite material comprises a metal member and a resin member joined to the metal member, wherein: The molding die of the composite material has: A mold body is formed with a first space for inserting the metal component and a second space, i.e., a cavity for molding the resin component; a first temperature sensor; and The second temperature sensor, When the metal member is inserted into the first space, the surface exposed to the second space is a bonding surface. When the metal member is not inserted into the first space, the surface that coincides with the position of the joint surface is a virtual surface. The first temperature sensor faces the first space that exists within the projection range of the imaginary plane in the normal direction of the imaginary plane. The second temperature sensor faces the second space that exists within the projection range of the imaginary plane.

[0011] (2) A method for producing a composite material disclosed herein is a method for producing a composite material using the molding die described in (1) above, wherein the composite material has a metal member and a resin member joined to the metal member. The method for manufacturing the composite material comprises: In a first step, a first temperature sensor is used to measure the temperature of a metal member inserted into a first space of the molding die; and In a second step, after the first step, the temperature of the metal member inserted into the first space of the molding die is measured by a first temperature sensor, and the temperature of the molten resin injected into the second space of the molding die is measured by a second temperature sensor.

[0012] Effects of the Invention

[0013] The present disclosure can accurately grasp the change in temperature within the molding die. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a longitudinal cross-sectional view of the composite material.

[0015] Figure 2 It is a longitudinal sectional view of the molding die.

[0016] Figure 3 It is a cross-sectional view of the molding die.

[0017] Figure 4 It is a perspective view for explaining the projection range of the joining surface of the metal members.

[0018] Figure 5 It is a longitudinal sectional view of a molding die showing a molding portion of a joint portion of a composite material.

[0019] Figure 6 yes Figure 5 VI-VI line cross-sectional view.

[0020] Fig. 7A It is a cross-sectional explanatory diagram showing the molding steps of the composite material.

[0021] Figure 7B It is a cross-sectional explanatory diagram showing the molding steps of the composite material.

[0022] Figure 7C It is a cross-sectional explanatory diagram showing the molding steps of the composite material.

[0023] Figure 8 It is a graph showing the temperature changes of the metal member and the resin member.

[0024] Fig. 9 It is a figure explaining the transfer mark of the protrusion of a molding die. DETAILED DESCRIPTION

[0025] <Overview of Embodiments of the Invention Disclosed>

[0026] Hereinafter, embodiments of the present invention will be described by listing them in outline.

[0027] (1) A molding die for a composite material disclosed herein is a molding die for molding a composite material, wherein the composite material comprises a metal member and a resin member joined to the metal member, wherein: The molding die of the composite material has: A mold body is formed with a first space for inserting the metal component and a second space, i.e., a cavity for molding the resin component; a first temperature sensor; and The second temperature sensor, When the metal member is inserted into the first space, the surface exposed to the second space is a bonding surface. When the metal member is not inserted into the first space, the surface that coincides with the position of the joint surface is a virtual surface. The first temperature sensor faces the first space that exists within the projection range of the imaginary plane in the normal direction of the imaginary plane. The second temperature sensor faces the second space that exists within the projection range of the imaginary plane.

[0028] The molding die of the above structure can measure the temperature of the metal component and the temperature of the resin component at the joint between the metal component and the resin component. Therefore, the molding die of the above structure can grasp the temperature of the joint, such as the temperature of the joint surface located at the boundary between the metal component and the resin component (heat transfer from the resin component to the metal component, etc.). The temperature of the joint affects the joint strength between the resin component and the metal component, so for example, the information representing the change of the temperature can be used to estimate the joint strength between the metal component and the resin component, or the temperature of the mold body can be controlled while observing the temperature in order to obtain the desired joint strength. In addition, the quantitative temperature information obtained can be associated with the joint strength, which can help design the molding conditions of the composite material.

[0029] (2) In the molding die of (1) above, regarding the molding die of (2), an inner surface of the mold body facing the imaginary surface in the second space has a plurality of concavoconvex portions, and the concavoconvex portions are at least one of convex portions and concave portions.

[0030] Through such a structure, the molding die of (2) forms multiple transfer marks on the resin component after molding. The multiple transfer marks are multiple concave or convex parts obtained by transferring multiple convex or concave parts. The heated and molten resin is injected into the mold. The injected molten resin is cooled in the mold and solidified to become a resin component. When the resin component is cooled after solidification, it shrinks significantly, especially outside the joint between the metal component. With this shrinkage, the relative position and shape of the multiple transfer marks change. The change in the relative position and shape of the concave and convex parts of the mold caused by cooling is so small as to be negligible relative to the change in the relative position and shape of the multiple transfer marks of the resin component. Therefore, the relative position, shape and displacement of the multiple transfer marks of the resin component relative to the concave and convex parts of the mold are related to the change in length and volume caused by the contraction of the resin component caused by cooling after solidification. In addition, the change in length and volume caused by the contraction of the resin component is related to the residual stress (internal stress) generated in the resin component. This residual stress affects the bonding strength between the metal component and the resin component. Therefore, by understanding the changes in length and volume caused by the shrinkage of the resin member, it is possible to estimate, for example, the bonding strength between the metal member and the resin member, and this can also contribute to the design of molding conditions for the composite material.

[0031] (3) In the molding die of (1) or (2) above, regarding the molding die of (3), the inner surface of the mold body along a direction intersecting the imaginary plane in the second space has a plurality of concavoconvex portions.

[0032] According to this structure, the molding die of (3) forms transfer marks on the resin component molded in the same manner as in (2) above. By understanding the relative positions, relative positions, and displacements of the shapes of the plurality of transfer marks relative to the concave and convex parts of the mold, it is possible to understand the changes in length and volume caused by the contraction of the resin component. By understanding the changes in length and volume caused by the contraction of the resin component, it is possible to estimate the bonding strength between the metal component and the resin component, and it is also possible to contribute to the design of molding conditions for composite materials.

[0033] (4) The method for producing a composite material disclosed herein is a method for producing a composite material using a molding die as claimed in any one of claims 1 to 3, wherein the composite material comprises a metal member as claimed in any one of (1) to (3) above and a resin member joined to the metal member, wherein: The method for manufacturing the composite material comprises: In a first step, a first temperature sensor is used to measure the temperature of a metal member inserted into a first space of the molding die; and In a second step, after the first step, the temperature of the metal member inserted into the first space of the molding die is measured by a first temperature sensor, and the temperature of the molten resin injected into the second space of the molding die is measured by a second temperature sensor.

[0034] In the above manufacturing method, before and after the resin component is injected into the second space, the temperature of the metal component can be measured by the first temperature sensor, and the temperature of the injected molten resin and the solidified resin component can be measured by the second temperature sensor. By understanding the change in the temperature of the metal component and the change in the temperature of the resin component, the change in the molten resin or the heat transferred from the resin component to the metal component can be estimated. The change in the temperature of the metal component and the change in the temperature of the resin component can be associated with the change in length and volume caused by the contraction of the resin component and the bonding strength with the metal component.

[0035] (5) In the manufacturing method of (4) above, in the manufacturing method of (5), in the first step, the second temperature sensor measures the temperature before the molten resin is injected into the second space.

[0036] The manufacturing method of (5) can grasp the change in temperature of the molten resin before and after injection into the second space.

[0037] <Details of Embodiments of the Present Disclosure>

[0038] Hereinafter, embodiments of the present disclosure will be described in detail.

[0039] Figure 1 It is a longitudinal cross-sectional view of the composite material.

[0040] The composite material 1 of this embodiment includes a metal component 2 and a resin component 3. The metal component 2 is, for example, aluminum or an aluminum alloy. However, the metal component 2 may be any metal such as iron, stainless steel, magnesium, etc. that can be inserted into a mold by injection molding. The metal component 2 of this embodiment is in the shape of an elongated strip, and the metal component 2 is made of a plate material. The shape of the metal component 2 can be changed to an appropriate shape.

[0041] The resin member 3 is, for example, engineering plastics such as PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), and PA (polyamide). However, the resin member 3 may be any resin that can be injection molded. The resin member 3 is in the shape of an elongated strip and is made of a plate. The shape of the resin member can be changed to an appropriate shape.

[0042] The metal component 2 is a roughly rectangular parallelepiped. The longest side of the sides of the metal component 2 is the width. The shortest side of the sides of the metal component 2 is the height. The side of the sides of the metal component 2 that is not the width and the height is the depth. The direction in which the width extends is the length direction. The direction in which the height extends is the height direction. The direction in which the depth extends is the depth direction.

[0043] One end of the metal member 2 in the longitudinal direction is joined to one end of the resin member 3 in the longitudinal direction in an overlapping state to form an integrated whole. Figure 1 The composite material 1 is manufactured by injection molding the resin member 3 and the metal member 2 as an integral part of a molded product formed by solidifying the injected molten resin 3' using a molding die 9 described below, with the metal member 2 as an insert.

[0044] Figure 2 It is a longitudinal sectional view of the molding die. Figure 3 It is a cross-sectional view of the molding die.

[0045] The molding die 9 includes a die main body 10 , temperature sensors 31 and 32 , and a pressure sensor 33 .

[0046] The mold body 10 has a lower mold 11, an upper mold 12, and mold members 13 and 14. The lower mold 11 has a recessed portion 11a. After the mold members 13 and 14 are accommodated in the recessed portion 11a of the lower mold 11, the recessed portion 11a of the lower mold 11 is blocked by the upper mold 12, thereby forming an internal space 20 in the mold body 10. The internal space 20 is composed of a first space 21 and a second space 22. The metal member 2 is accommodated in the first space 21. After the mold members 13, 14, and the metal member 2 are accommodated in the recessed portion 11a of the lower mold 11, the recessed portion 11a of the lower mold 11 is blocked by the upper mold 12, thereby forming a second space 22 as a cavity in the mold body 10. The molten resin 3' (refer to Fig. 7A ) is injected into the second space 22. The molten resin 3' solidifies in the second space 22 to form the resin member 3. The molten resin 3' solidifies in the second space 22 and is integrated with the metal member 2. The integrated resin member 3 and the metal member 2 are a composite material 1. The lower mold 11 or the upper mold 12 has an injection path 15 for injecting the molten resin 3' into the second space 22 (see Figure 3 ).

[0047] The ejector pin (ejection tool) 16 is assembled to the lower mold 11 . The ejector pin (ejection tool) 16 demolds the composite material 1 from the lower mold 11 .

[0048] exist Figure 2 and Figure 3In FIG. 1 , the portion surrounded by the double-dashed line represents the surface of the metal component 2 inserted into the first space 21 exposed to the second space 22, in other words, the projection range R of the metal component 2 in the upper and lower directions (i.e., the normal direction of the bonding surface 2a) relative to the bonding surface 2a of the resin component 3. If described in more detail, Figure 4 As shown, the projection range R is a three-dimensional area of ​​a roughly prism or roughly rectangular parallelepiped shape consisting of a range (space) R2 obtained by projecting the joint surface 2a of the metal component 2 (the portion indicated by the dotted line shadow) upward (on one side of the normal direction A) and a range (space) R1 obtained by projecting downward (on the other side of the normal direction A). The projection range R can also be said to be a three-dimensional area of ​​a roughly prism or roughly rectangular parallelepiped shape. Figure 1 The space area of ​​the joint 5 shown is formed. Figure 2~Figure 4 and the following Figure 5 In FIG. 7 , in order to avoid overlapping of lines and to easily indicate the projection range R, the projection range R is indicated to be slightly larger than its actual size.

[0049] Figure 5 It is a longitudinal sectional view of a molding die showing a molding portion of a joint portion of a composite material.

[0050] like Figure 5 As shown, the molding die 9 of the present embodiment includes a first temperature sensor 31 and a second temperature sensor 32 .

[0051] When the metal member 2 is inserted into the first space 21 of the lower mold 11, the surface exposed in the second space 22 is the bonding surface 2a. When the metal member 2 is not inserted into the first space 21, the surface that coincides with the position of the bonding surface 2a is the virtual surface 2a. Therefore, the projection range R of the virtual surface 2a coincides with the projection range R of the bonding surface 2a.

[0052] The first temperature sensor 31 is provided in the lower mold 11. The first temperature sensor 31 faces the first space 21 existing in the projection range R of the imaginary surface 2a. More specifically, the first temperature sensor 31 is provided on the inner surface 21a of the mold body 10 that contacts the surface on the opposite side of the imaginary surface 2a of the metal member 2 (the surface forming the first space 21; specifically, the bottom surface of the recessed portion 11a of the lower mold 11). The first temperature sensor 31 faces the first space 21 existing in the projection range R of the imaginary surface 2a in the normal direction of the imaginary surface 2a.

[0053] Therefore, the first temperature sensor 31 measures the temperature of the metal member 2. The temperature measured by the first temperature sensor 31 is substantially the temperature of the metal member 2.

[0054] In addition, the first temperature sensor 31 may be disposed at other positions as long as it faces the first space 21 existing in the projection range R of the imaginary plane 2a. For example, the first temperature sensor 31 may be disposed on the inner surface 21b of the mold body 10 that forms the first space 21 along a direction intersecting the imaginary plane 2a.

[0055] The second temperature sensor 32 is provided on the upper mold 12. The second temperature sensor 32 faces the second space 22 existing in the projection range R of the imaginary plane 2a. More specifically, the second temperature sensor 32 is provided on the inner surface 22a (the surface forming the second space 22; specifically, the lower surface of the upper mold 12) of the mold body 10 that is opposite to the imaginary plane 2a and forms the second space 22. The second temperature sensor 32 faces the second space 22 existing in the projection range R of the imaginary plane 2a.

[0056] Therefore, the second temperature sensor 32 measures the temperature of the second space 22 of the cavity before the molten resin 3' is injected, the temperature of the molten resin 3' when the molten resin 3' is injected, and the temperature of the resin member 3 after the molten resin 3' is solidified. The temperature measured by the second temperature sensor 32 is substantially any one of the temperature of the second space 22, the temperature of the molten resin 3', and the temperature of the resin member 3.

[0057] In addition, the second temperature sensor 32 may be disposed at other positions as long as it faces the second space 22 existing in the projection range R of the imaginary plane 2a. For example, the second temperature sensor 32 may be disposed on the inner surface 22b of the mold body 10 that forms the second space 22 along a direction intersecting the imaginary plane 2a.

[0058] like Figure 5 As shown, the molding die 9 has a pressure sensor 33. Although the pressure sensor 33 deviates from the projection range R of the imaginary plane 2a, it is set in the vicinity of the projection range R. Specifically, the pressure sensor 33 is set on the inner surface 22a (the lower surface of the upper mold 12) of the mold body 10 that forms the second space 22. The pressure sensor 33 measures the pressure of the molten resin 3' injected into the second space 22. The pressure is proportional to the filling density of the molten resin 3' in the second space 22. The pressure sensor 33 may also face the second space 22 existing in the projection range of the imaginary plane 2a, similarly to the second temperature sensor 32.

[0059] Figure 6 yes Figure 5 VI-VI line cross-sectional view.

[0060] A plurality of concave and convex portions 41 are formed on the inner surface 22a of the mold body 10 opposite to the joining surface 2a of the metal member 2, specifically, on the lower surface of the upper mold 12 located above the imaginary surface 2a. The concave and convex portions 41 of the mold of the present embodiment are convex portions 41. The mold of the present embodiment has four convex portions 41. Each convex portion 41 protrudes from the lower surface of the upper mold 12 in the shape of a cylinder. The positions and shapes of the four convex portions 41 are known in advance. The relative positional relationship and shape of the four convex portions 41 are specified. In the mold body 10 of the present embodiment, the four convex portions 41 are arranged at positions corresponding to the four corners of a square (which is referred to as a square shape). Each convex portion 41 forms a concave portion as a transfer mark on the resin member 3 molded by the second space 22.

[0061] The configuration of the four convex portions 41 may also be a position corresponding to the four corners of a rectangle other than a square (rectangle), a position corresponding to the four corners of a rhombus (rhombus), or a position corresponding to the four corners of a parallelogram (parallelogram). The number of convex portions 41 is two or more. Preferably, the number of convex portions 41 is three or more. The configuration of the plurality of convex portions 41 may also be a position corresponding to the three corners of a triangle (triangular shape), a position corresponding to the five corners of a pentagon (pentagonal shape), or a position corresponding to the corners of a polygon (polygonal shape) depending on the number. It is also possible to form a plurality of recesses on the inner surface 22a of the mold body 10 instead of the plurality of convex portions 41. In this case, each recess forms a convex portion as a transfer mark on the resin member 3 molded by the second space 22.

[0062] like Figure 5 As shown, the adhesive 43 is provided on the joint surface 2a of the metal member 2 arranged in the first space 21. The resin member 3 molded in the second space 22 is bonded to the metal member 2 by the adhesive 43.

[0063] Figure 7A to Figure 7C It is a cross-sectional explanatory diagram showing the molding steps of the composite material.

[0064] Reference Figure 7A to Figure 7C The steps of molding the composite material 1 will be described.

[0065] The first state is Fig. 7A The first state is a state where two mold members 13 and 14 are arranged in the recessed portion 11 a of the lower mold 11 , the metal member 2 is inserted into the first space 21 , and the molten resin 3 ′ is injected into the second space 22 .

[0066] The second state is Figure 7BAs shown. The second state is a state in which the molten resin 3' is injected into the second space 22. In the second state, pressure is applied to the internal space 20, and the molten resin 3' flows along the engraved portion of the first space 21 (cavity) of the mold body 10. Then, by cooling, the molten resin 3' solidifies to become the resin component 3. When the molten resin 3' solidifies, the metal component 2 and the resin component 3 are integrated to form the composite material 1. During the process so far, the first temperature sensor 31 measures the temperature of the metal component 2, the second temperature sensor 32 measures the temperature of the cavity, i.e., the second space 22, before the molten resin 3' is injected, the temperature of the molten resin 3' when the molten resin 3' is injected, and the temperature of the resin component 3 after the molten resin 3' is solidified, and the pressure sensor 33 measures the pressure of the molten resin 3' injected into the second space 22.

[0067] The third state is Figure 7C After the composite material 1 is formed, the upper mold 12 of the mold body 10 is removed from the lower mold 11 , and the formed composite material 1 is removed from the concave portion 11 a of the lower mold 11 together with the two mold members 13 , 14 through the ejector pin 16 .

[0068] When the composite material 1 is molded through the above process, the resin component 3 shrinks by being cooled in the cooling process. A part of the resin component 3 is bonded to the bonding surface 2a of the metal component 2. The shrinkage of the resin component 3 is small near the bonding surface 2a, and the more away from the bonding surface 2a, the greater. Therefore, a part of the resin component 3 near the bonding surface 2a is restricted in shrinkage and is prone to generate internal stress (residual stress). The residual stress affects the bonding strength between the metal component 2 and the resin component 3 on the bonding surface 2a. Therefore, understanding the extent of the shrinkage of the resin component 3 is helpful for estimating and managing the bonding strength.

[0069] Figure 8 It is a graph showing the temperature changes of the metal member and the resin member.

[0070] The temperature of the metal member 2 measured by the first temperature sensor 31 and the temperature of the resin member 3 measured by the second temperature sensor 32 are, for example, Figure 8 In the state just before the molten resin 3' is injected into the second space 22, the measured value of the first temperature sensor 31 and the measured value of the second temperature sensor 32 are both substantially consistent with or close to the temperature T0 of the mold body 10. The temperature of the mold body 10 is controlled to be constant by a control device not shown.

[0071] When the molten resin 3' is injected into the second space 22, the measured value of the second temperature sensor 32 rises sharply to the temperature Tr of the molten resin 3' by contacting the molten resin 3'. The heat of the molten resin 3' is gradually transferred to the metal component 2, and the temperature of the metal component 2 rises. As the temperature of the metal component 2 rises, the measured value of the first temperature sensor 31 gradually rises. The molten resin 3' takes away heat from the molding die 9 and the metal component 2, and the measured value of the second temperature sensor 32 gradually decreases. After the measured value of the first temperature sensor 31 reaches the peak value Tm, the measured value of the first temperature sensor 31 and the measured value of the second temperature sensor 32 converge to the same temperature, and both gradually decrease.

[0072] As described above, the molding die 9 of the present embodiment measures the temperature of the metal member 2 by the first temperature sensor 31 and measures the temperature of the resin member 3 (molten resin 3') by the second temperature sensor 32, thereby being able to grasp the change in temperature at the joint portion 5 of the composite material 1. In particular, the molding die 9 of the present embodiment is able to grasp the temperature near the joint surface 2a located at the boundary between the metal member 2 and the resin member 3, for example, the transfer of heat from the resin member 3 to the metal member 2 through the joint surface 2a.

[0073] The temperature change of the joint 5 affects the bonding strength between the metal component 2 and the resin component 3. For example, when the temperature at the joint 5 is too low or too high, the bonding strength of the joint 5 may be reduced. By using the molding die 9 of the present embodiment, the change in temperature of the joint 5 during the manufacture of the composite material 1 can be grasped, and the change in temperature can be associated with the bonding strength between the metal component 2 and the resin component 3, or the molding temperature can be optimized based on the associated data, or the bonding strength can be estimated based on the change in temperature, or the temperature of the mold body 10 can be controlled while observing the change in temperature. Therefore, by using the molding die 9 of the present embodiment, the data of the temperature change of the joint 5 can be used to obtain the appropriate bonding strength. In addition, by monitoring the change in temperature of the joint 5, the deviation in the quality of the composite material 1 can be suppressed.

[0074] Fig. 9 It is a figure explaining the transfer mark of the protrusion of a molding die.

[0075] The four recessed portions 3a are formed as the protruding portions 41 (see Figure 6 ) is formed on the surface of the resin member 3 in the composite material 1 after molding. After injection molding, the resin member 3 of the composite material 1 shrinks by cooling. If the resin member 3 does not shrink, the arrangement of the four concave portions 3a and the convex portions 41 transferred to the resin member 3 (in Fig. 9The four recesses 3a (indicated by double dotted lines) are similarly arranged in a square shape. As the resin member 3 shrinks, the relative positions of the four recesses 3a change. For example, the distances L1 to L4 between adjacent recesses 3a, the distances L5 and L6 between the recesses 3a located on the diagonal lines, the angle θ between the two diagonals, etc. change. The shape of the recess 3a also changes relative to the shape of the protrusion 41. Therefore, by measuring these values ​​L1 to L6, θ or analyzing the changes in the positions of the recesses 3a and the shapes of the recesses 3a, the changes in the shrinkage of the resin member 3 (the amount of shrinkage, the direction of shrinkage, etc.) can be understood. In addition, the changes in the shrinkage of the resin member 3 can also be understood by parameters other than the distances and angles of the four recesses 3a mentioned above.

[0076] In addition, the change in the shrinkage of the resin member 3 is also related to the filling density of the molten resin 3' relative to the second space 22 of the mold body 10. The higher the filling density of the molten resin 3', the smaller the shrinkage of the resin member 3. By utilizing the fact that the filling density of the molten resin 3' is proportional to the pressure in the second space 22, the change in pressure obtained from the measurement value of the pressure sensor 33 can be used to estimate the filling density of the molten resin 3'. Therefore, the change in pressure obtained from the measurement value of the pressure sensor 33 can be used to grasp the change in the shrinkage of the resin member 3.

[0077] In addition, as described above, in a part of the resin member 3 near the joint surface 2a of the metal member 2, since the shape of the resin member 3 is constrained, the shrinkage of the resin member 3 becomes smaller, but since the constraint brought by the joint surface 2a in another part of the resin member 3 becomes weaker as it is farther away from the joint surface 2a, the shrinkage of the other part of the resin member 3 becomes larger. Therefore, a part of the resin member 3 near the joint surface 2a is stretched by the joint surface 2a, and residual stress such as tensile stress is easily generated. This residual stress is related to the change in the shrinkage of the resin member 3, and also affects the bonding strength between the metal member 2 and the resin member 3.

[0078] Therefore, in the injection molding using the molding die 9 of the present embodiment, the change in the shrinkage of the resin member 3 can be grasped using the relative positional relationship between the four recesses 3a formed in the resin member 3, the shape of the recesses 3a, the measured value of the pressure sensor 33, etc., and the bonding strength between the metal member 2 and the resin member 3 can be estimated based on the change in the shrinkage. In addition, by controlling the filling speed and filling amount of the molten resin 3' while observing the pressure of the molten resin 3', it is possible to obtain an appropriate bonding strength for the composite material 1 as a molded product, thereby suppressing quality deviations.

[0079] The measured values ​​of the temperature sensors 31 and 32, the measured value of the pressure sensor 33, and the characteristic quantities (for example, integral value, maximum value, minimum value, slope of the graph, etc.) calculated using these measured values ​​are integrated, and the relationship between these data and the bonding strength of the composite material 1 obtained by tensile testing after molding is analyzed, or the bonding mechanism is analyzed based on these data. This is related to the situation that the analysis results are reflected in the development of a model basis for the manufacturing design of the composite material 1.

[0080] [other]

[0081] The embodiments disclosed this time are to be considered in all respects as illustrative and non-restrictive. The scope of the present invention is indicated by the claims, and all modifications within the meaning and scope equivalent to the claims are included.

[0082] For example, the joint surface 2a of the metal component 2 may not be a flat surface, but may be a curved surface or a bent surface. In either case, the temperature sensors 31 and 32 are arranged in a manner facing the first space 21 or the second space 22 of the projection range R in the normal direction of the joint surface 2a or the imaginary surface equivalent to the joint surface 2a.

[0083] Description of Reference Numerals

[0084] 1: Composite materials

[0085] 2: Metal components

[0086] 2a: Joint surface

[0087] 3: Resin components

[0088] 9: Molding mold

[0089] 10: Mold body

[0090] 20: Internal Space

[0091] 21: First Space

[0092] 22: Second Space

[0093] 31: First temperature sensor

[0094] 32: Second temperature sensor

[0095] 41: convex part

[0096] A: Normal direction

[0097] R: Projection range

Claims

1. A composite material molding die, which is a molding die for molding a composite material, wherein the composite material has a metal component and a resin component joined to the metal component, wherein: The molding die of the composite material has: A mold body is formed with an internal space, the internal space including a first space for inserting the metal component and a second space, i.e., a cavity for molding the resin component; a first temperature sensor; and The second temperature sensor, When the metal member is inserted into the first space, the surface exposed to the second space is a bonding surface. When the metal member is not inserted into the first space, the surface that coincides with the position of the joint surface is a virtual surface. The first temperature sensor faces the first space that exists within the projection range of the imaginary plane in the normal direction of the imaginary plane. The second temperature sensor faces the second space that exists within the projection range of the imaginary plane.

2. The composite material forming die according to claim 1, wherein: The inner surface of the mold body facing the imaginary surface in the second space has a plurality of concavo-convex portions, and the concavo-convex portion is at least one of a convex portion and a concave portion.

3. The composite material forming die according to claim 1, wherein: The inner surface of the mold body along a direction intersecting the imaginary plane in the second space has a plurality of concavo-convex portions.

4. A method for producing a composite material, comprising using the molding die according to any one of claims 1 to 3, wherein the composite material comprises a metal member and a resin member joined to the metal member, wherein: The method for manufacturing the composite material comprises: In a first step, a first temperature sensor is used to measure the temperature of a metal member inserted into a first space of the molding die; and In a second step, after the first step, the temperature of the metal member inserted into the first space of the molding die is measured by a first temperature sensor, and the temperature of the molten resin injected into the second space of the molding die is measured by a second temperature sensor.

5. The method for producing a composite material according to claim 4, wherein: In the first step, the temperature of the molten resin before being injected into the second space is measured by the second temperature sensor.

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