JPS6357233B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a composite molded product of a metal plate and a resin, and particularly to a composite molded product of a metal plate and a resin, which is formed by integrally molding a resin protrusion on a metal plate having a through hole. Composite molded products made of metal plates and resin (hereinafter simply referred to as composite molded products) have recently come to be used for mounting parts of audio or video equipment, but these composite molded products are Therefore, high precision is required for the perpendicularity of the resin protrusions with respect to the metal plate and the parallelism between the resin protrusions. FIG. 1 shows the structure of a conventionally used composite molded product, which includes a metal plate 2 having a through hole 1, a resin collar 31 molded on both sides of the metal plate 2 through the through hole 1, 32 and a resin protrusion 4 that is integrated with the resin collar 31. FIG. 2 shows the configuration of a mold for forming such a composite molded product, in which a metal plate 2 having a through hole 1 is fixed at 100, a resin collar 31 and a resin protrusion integrally formed therewith. 4 and a first mold in which a runner part 51 for resin inflow is provided, 200 a resin collar part 32 located on the other surface of the metal plate 2, and a runner part 5 that connects these resin collar parts 32.
2 and a second mold in which a sprue 71 is connected to these through the gate 6, and 300 is a second mold in which a runner part 53 and a sprue 72 are provided, which connect the sprue 71 of the second mold 200. The metal plate 2 having the through hole 1 is fixed in the first mold 100, the second mold 200 and the third mold 300 are overlapped, and the resin is applied through the sprues 72 and 71. By press-fitting, a composite molded product is created that has resin collars 31 and 32 integrated on both sides of the metal plate 2 via the resin in the through hole 1 of the metal plate 2, and is provided with a resin protrusion 4. be done. Composite molded products formed in this way are subject to large thermal stress due to the difference in coefficient of thermal expansion between the metal and resin that make up the product, resulting in warpage of the metal plate or inclination of resin protrusions such as bosses and ribs. etc., and a composite molded product with good precision could not be obtained. In order to avoid this problem, conventional methods have been to reduce the amount of resin by reducing the number of resin protrusions molded on the metal plate, and in particular to reduce the amount of resin by reducing the number of runners that connect the resin protrusions. A method of reducing this is used. However, if the amount of resin used is reduced, for example, due to accuracy problems, it becomes necessary to mold the parts separately, which increases the number of steps. The advantages of the molded product are lost. In addition, since the runner part is the part that becomes the flow path for the molten resin during molding,
Reducing the amount of resin in this portion means reducing the cross-sectional area of the flow path or increasing the number of gates. However, if the former is adopted, flow resistance increases and formability deteriorates, so
There are problems in that the number of defective products increases and the number of resin protrusions formed on the metal plate surface needs to be reduced.If the latter is adopted, gate processing will be required, so it will be difficult to use the metal plate. The problem is that the number of mold manufacturing steps increases. These points become particularly problematic when the height of the resin protrusion is high and precise perpendicularity is required. For example, diameter 3~8mm, height 15~
In the case of a resin protrusion with a circular cross section of 40 mm, the inclination angle of the resin protrusion with respect to the perpendicular from the metal plate surface is exactly right (hereinafter referred to as inclination accuracy. δ and h shown in Fig. 1 are measured. (given by δ/h) is approximately 1/200 to 1/100, and it has been difficult to obtain higher accuracy. In addition, in order to improve the accuracy immediately after molding, resin collars 31 and 32 are made larger as shown in Figure 3-a, or metal parts are used as shown in Figures 4-a and 4-b. Four through holes 11 are provided at equal intervals in four directions from the resin protrusion 4 of the plate 2, and the rib 33 and resin collar 34 are integrated with the metal plate 2 through the through holes 11. There is one that holds a resin protrusion 4. Note that in FIGS. 3 and 4, the same parts as in FIG. 1 are given the same reference numerals, and the same parts in the various figures of this specification are given the same reference numerals. In the composite molded product having the shape shown in Fig. 3-a, since it is fixed to the metal plate 2 with a force 80 as shown in Fig. 3-b, the resin collar portions 31 and 32 are When a force that causes such deformation is applied, and the resin collar parts 31 and 32 are used for a long period of time, the resin collar parts 31 and 32
is deformed into the shape shown in Fig. 3-c, resulting in poor accuracy. In particular, in this composite molded product, as shown in FIG. 5, the plurality of resin protrusions 4 are molded using runner parts 51 that serve as resin passages, so the runner parts 51 remain even after molding, and the runner parts 51 have nozzles. Residual stress 82 as shown in FIG. 5-a is generated, and after long-term use, the resin protrusion 4 is deformed, for example, inclining toward the runner portion 51 as shown in FIG. 5-b. On the other hand, the composite molded product shown in FIG.
As shown in FIG. 6, the inclination accuracy is poor compared to the composite molded product shown in the figure. Figure 6 shows the relationship between the resin temperature (°C) and inclination accuracy (δ/h) during molding when polyacetal is used as the resin and the shape of the resin protrusion is the same. respectively, the third
4 shows the case of the composite molded product shown in FIG. Further, from the viewpoint of resin inflow and cooling, residual stress tends to be uneven, so dimensional changes that occur during long-term use are often inferior to those of the shape shown in FIG. 3. In addition, as shown in FIG. 7, there is a model in which the resin collar on the side of the resin protrusion 4 is omitted and the through hole 1 of the metal plate 2 is enlarged within the size of the resin protrusion 4; The inclination accuracy of composite molded products is also the third
It is equivalent to or inferior to that shown in FIG. The present invention aims to improve the drawbacks of these conventional techniques and provide a composite molded product of a metal plate and resin with good dimensional accuracy. A composite molded product of a metal plate and resin, which has a resin protrusion protruding from a plane, and the resin protrusion is locked to the metal plate by the resin in the through hole that is integrated with the resin protrusion. In the above, the through hole is composed of a central through hole provided directly below the resin protrusion, and an auxiliary through hole located in a peripheral area of the central through hole, and the through hole is provided on the side where the resin protrusion is provided. a resin collar that contacts the metal plate and covers at least a portion of the central through hole and the auxiliary through hole, and that contacts the metal plate on the side where the resin protrusion is not provided and covers only the central through hole; It is characterized by having. That is, the present invention has confirmed through experiments that the inclination accuracy of the resin protrusion is controlled by residual stress, and the resin protrusion is provided as a means for preventing deformation of the resin protrusion due to residual stress. A resin collar part that covers at least part of the central through hole and the auxiliary through hole on the side, and a resin collar part that covers the central through hole on the side where the resin protrusion is not provided are provided to reduce the shrinkage force of the resin in the through hole. Therefore, the resin protrusion is fixed to the metal plate. The thickness of the metal plate used here, the dimensions, shape, and arrangement of the through holes, and the dimensions, shape, and arrangement of the resin collar are selected depending on the required inclination accuracy.
In particular, for the metal plate, use a steel plate with a thickness of 2 mm or more, and for the through hole, make a through hole with a diameter of 3 mm or more whose center is on the circumference of a circle with a radius of 10 mm or more centered on the center of the resin protrusion. High tilt accuracy can be obtained when When a through hole is provided directly below the resin protrusion, the diameter of the through hole is 3 mm or more, and the projected area of the through hole directly below the resin protrusion and the resin collar on the plane defined by the metal plate surface. The ratio is 1/
High inclination accuracy can be obtained when the thickness is 15 or less, and in either case, good inclination accuracy is obtained when the thickness of the resin collar portion is 1.5 mm or more. Examples will be described below. Figures 8-a and 8-b show the top surface of one embodiment and the X ₁ -Y ₁ -Z ₁ cross section of Figure 8-a, respectively. There are three through holes 111, 112 and 113 having the same diameter and whose centers are arranged at equal intervals on the circumference of a circle having the same center as the resin collar parts 35 and 36. The size is such that these through holes 111, 112 and 113 can be covered. Figures 9-a and 9-b show the top surface of another embodiment and the X ₁ '-Y ₁ '- of Figure 9-a, respectively.
This shows a Z ₁ ' cross section, and the difference from the embodiment shown in FIG. This point covers part of the through hole. In this case, the circumference of the circle coaxial with the resin protrusion where the center of the through hole is located does not protrude beyond the resin collar 35, that is, the diameter of the circle is the diameter of the circle defining the resin collar 35. It is within. Figures 10-a and 10-b are the top surfaces of other embodiments and X ₂ -Y ₂ - of Figure 10-a, respectively.
This shows a cross section of _Z3 , and the difference from the embodiment shown in FIG.
It is a point with a value of 4. In this case, the diameter of the central through hole 114 directly below the resin protrusion 4 is the same as that of the other through holes 11.
1, 112, and 113, and the term "directly below the resin protrusion 4" means that the center of the resin protrusion 4 and the center through hole 114 are aligned. In this way, the central through hole 1 is placed directly below the resin protrusion 4.
By providing 14, the connection between the metal plate 2 and the resin collar portions 35 and 36 can be made stronger. Figure 11-a, Figure 11-b, Figure 11-c,
Figures 12-a, 12-b, and 12-c are top views and cross-sections (X ₃ -Y ₃ -Z ₃ cross section in Figure 11-a, 12-
This _figure shows _the cross _- section (
and 114, respectively. 361, 362, 6 and 3 in each figure
Reference numeral 64 indicates these resin collars. In these embodiments, the number of through holes located on the circumference is three, but the number of through holes may be three or more, and the reason why the number of through holes is three or more is as follows. In other words, when there is only one through hole, as described in the explanation of the conventional example, deformation as shown in Figure 3-c occurs after long-term use, reducing the effectiveness of the resin collar and reducing accuracy. Deteriorate. Also,
When there are two through holes, for example, two through holes 111 and 11 as shown in FIG. 13-a and FIG. 13-b (FIG. 13-a is a top view of FIG. 13-b)
2, the direction in which the through holes 111 and 112 are connected is good after long-term use, but
In a direction perpendicular to this, deformation occurs due to residual stress as shown in Figure 13-b, resulting in poor accuracy. Taking these points into consideration, at least three through holes are required to prevent the resin collar from deforming. In addition, the runner part that becomes the resin flow path during molding remains in the molded product, and the accuracy deteriorates due to residual stress in this part.
Deformation occurs as shown in the conventional examples shown in FIGS. a and 5-b, and when there are two through holes, deformation occurs as shown in FIGS. 14 and 15. FIG. 14 shows that two through holes 111 and 112 are connected to the runner part 5.
Fig. 14-a shows the top surface, and Fig. 14-b shows the cross-section. In this case, the resin collar portion 5 on the side with the runner portion 51 and the resin collar portion 36 without the runner portion undergo different deformations. FIG. 15 shows two through holes 111,
112 is located in the direction of the runner part 51, FIG. 15-a is a top view, FIG. 15-b is a cross-sectional view, and FIG.
Figure -c shows the side view, in this case the 15th
As shown in figure -c, the resin collar portion is deformed and its effectiveness is reduced. Therefore, if three or more through holes are provided, the resin part in the through hole can prevent the resin collar from warping no matter which direction the runner part is placed, and the inclination accuracy of the resin protrusion can be improved. Become. Table 1 shows the results after molding of the composite molded product of this example.
The boss collapse rate (inclination accuracy when the cross section of the resin protrusion is circular) (%) is shown in comparison with conventional composite molded products after a week has passed. The resin used is polyacetal. In addition, in any case, the diameter is 8
mm, with a 40mm long boss and a 3mm diameter through hole.

[Table] In the composite molded product of the present invention shown in Fig. 8, which is integrally molded on a steel plate with a diameter of 1.5 mm, the diameter of the resin collar is 20 mm.
mm, the diameter of the circle in which the center of the through hole is located is 15 mm
The conventional composite molded product shown in Figure 3 uses a resin collar with a diameter of 20 mm, and the conventional composite molded product shown in Figure 4 uses a rib fixed on the circumference of a circle with a diameter of 16 mm. The one in which the center of the hole was located was used.
In addition, molding conditions A, B, C, and D are mold temperature 60℃,
The cylinder temperature was kept constant at 190°C, and the injection pressures were set to 800, 1000, 1200, and 1400 Kg/ ^cm2 , respectively. As is clear from this table, although the composite molded product shown in Figure 4 supported by ribs has multiple through holes, it is more likely to cause boss collapse than the one with a single through hole shown in Figure 3. It shows. Furthermore, the composite molded product shown in Figure 8 is extremely different from the composite molded product shown in Figure 4 in terms of the boss collapse rate, and the inclination accuracy is good immediately after molding and after being left for a long time.
Moreover, since the shape is simpler than that of the composite molded product shown in FIG. 4, non-uniformity of residual stress due to flow and cooling is eliminated, and the inclination accuracy is improved. Furthermore, in addition to the through-hole whose center is located on the circumference of a circle, a separate central through-hole is installed directly below the resin protrusion, and the stress is more evenly distributed by the resin in the central through-hole. Therefore, variations in the distance between the resin protrusions can be further reduced. However, whether or not this central through hole is provided, there is almost no difference in the inclination accuracy of the resin protrusion. In addition, when a separate central through hole is provided directly below the resin protrusion, the ratio α of the projected area of the central through hole directly below the resin protrusion and the resin flange in the metal plate surface direction will affect the tilt accuracy δ/h. Therefore, good inclination accuracy can be maintained by using a steel plate of 2 mm or more as the metal plate, making each through hole have a diameter of 3 mm or more, and α of 1/15 or less. Figure 16 shows the relationship between α and δ/h. It was calculated using a 2 mm steel plate as the metal plate, a through hole diameter of 3 mm, and a resin collar thickness of 1.5 mm. This shows that δ/h becomes smaller when it becomes 1/15 or less. Also, Figure 11,
There is almost no difference in the effect even when the resin collar on the resin protrusion side is integrated and each through hole is made independent on the opposite side as shown in Figure 2. Figure 17 shows the experimental results regarding the relationship between the thickness of the metal plate and the inclination accuracy of the resin protrusion.The horizontal and vertical axes are the thickness of the metal plate (mm),
δ/n is set, and C, D and E are respectively immediately after molding, after being left at 90℃ for 500 hours, and at 90℃,
The value is shown after being left for 1000 hours. This figure shows that when a steel plate with a thickness of 2 mm or more is used as the metal plate, the inclination accuracy of the resin protrusion is much better than when the thickness is less than 2 mm, and there is almost no difference due to thickness. Therefore, it is desirable to use a steel plate with a thickness of 2 mm or more as the metal plate in order to improve the tilt accuracy. Note that the variation in the thickness of the metal plate in this experiment was ±0.2 mm, and each measurement point was the average value of 10 molded products. Note that the thickness of the metal plate is also affected by the warpage of the metal plate when the runner portion is disposed on one side of the metal plate. Figure 18-a shows the relationship between the warpage rate and the thickness of the metal plate when the warpage rate is a/l x 100 using a and l in Figure 18-b. The thickness (mm) and warpage rate (%) of the metal plate are shown respectively. This figure shows the thickness of the metal plate 2.0
This shows that when the thickness exceeds mm, the warpage becomes extremely small, and there is almost no difference due to thickness. In view of the inclination accuracy of these resin protrusions and the warpage of the metal plate, it is desirable that the thickness of the metal plate be 2 mm or more. Figure 19 shows the results of an experiment confirming the relationship between the diameter of the through-hole and the residual stress ^. ) are taken, and F and G indicate the case where the thickness of the metal plate is 1 mm and 2 mm, respectively. This figure shows that when the through hole has a diameter of 3 mm or more, the residual stress is lower than when the diameter is less than 3 mm.
This shows that there is almost no difference due to diameter. In this case, the greater the residual stress, the greater the deformation that occurs during long-term use, and the more likely cracks will occur. Therefore, the diameter of the through hole is preferably 3 mm or more. Figure 20 shows the relationship between the diameter of the circle and the residual stress when the center of the through hole is placed on the circumference of a circle coaxial with the resin protrusion, and the horizontal axis and
The diameter of the circle in which each through hole is installed on the vertical axis (mm),
The residual stress (Kg/cm ² ) is constant, the thickness of the metal plate is 2 mm, and the diameter of the through hole is 3 mm. This figure shows that when the diameter of the through-holes is 3 mm or more, residual stress can be generated by placing the through-holes in the metal plate at equal intervals on the circumference of a circle with a diameter of 10 mm or more from the center of the resin protrusion. This indicates that the number of through holes is smaller than that when the diameter is less than 10 mm, and it is desirable to install the through hole on the circumference of a circle with a diameter of 10 mm or more. Here, the reason why the diameters of the through holes installed on the circumference are made equal and the intervals are made equal will be explained. In other words, if the diameters of the through holes are unequal, the residual stress per unit area is the same, so a large force will be generated in the part of the through hole with a large diameter, resulting in an imbalance in the residual stress between the through holes. This may cause significant deformation when used for a long period of time.
Furthermore, if the intervals between the through holes are not equal, an imbalance in residual stress will similarly occur. That is, when the diameters of the through holes are made equal and the intervals between the through holes are made equal, the residual stress is most balanced and deformation is reduced. However, when a central through hole is provided directly below the resin protrusion, it is not necessarily necessary that the diameter of this central through hole be equal to the diameters of the other through holes. This is because the center through hole directly below the resin protrusion has the same center as the resin protrusion, so it becomes the center of the circumference of the circle where the centers of the other through holes are located.
This is because residual stress between the through holes does not become unbalanced. Further, the stress generated in the central through hole directly below the resin protrusion acts only in the direction of fixing the resin protrusion to the metal plate, and does not have a component in the direction of causing inclination. Further, when the central through hole is provided directly below the resin protrusion, there are the following advantages. Since there is a difference in thermal expansion coefficient between resin and metal,
1-a shows a cross section, and FIG. 21-b shows a longitudinal section), the through-hole 111 and the through-hole 111
A slight gap 91 is created between the inner resin 9 and the inner resin 9. However, due to shrinkage of the resin collar, the through hole 1
The resin 9 in the through hole 111 comes into contact with the wall of the through hole 111 and is under stress. Therefore, when an external force acts on the resin protrusion, the combined force of the applied stress and the above-mentioned stress acts on the resin 9 in the through hole 111, and since it is in contact with the metal plate,
Large stress concentrations occur at the contact area. However, as shown in FIG. 22, the resin 9 in the central through hole 114 installed directly below the resin protrusion has holes in the central through hole 114 and surrounding through holes 111, 1 in the resin collar.
With respect to the direction shown by the arrow connecting 12 and 113,
Since equal stress 83 is acting from each direction,
It is in a state where it does not touch the wall of the central through hole 114. Therefore, even when an external force is applied, a high strength greater than the mere cross-sectional area of the fixed portion can be obtained. This is a phenomenon that occurs when the peripheral through holes 111, 112, and 113 have the same diameter and are spaced at equal intervals, and unless these conditions are met, this will not necessarily occur. It should be noted that such a gap seems to occur even when only one central through hole is installed directly under the resin protrusion and no other through holes are installed, but in general, the gap shown in Figure 23 is Since the runner part 51 is installed in the resin flange part 31 as shown in FIG. There is. On the contrary,
In the case of the present invention, even if there is a runner part, the surrounding through-holes serve as a buffer, and the
The degree of influence on the resin in the through hole directly below the resin protrusion is reduced. Figure 24 shows the experimental results of the relationship between the thickness of the resin collar and the inclination accuracy of the resin protrusion.
The vertical axis shows the thickness of the resin collar (mm),
This is a case where δ/h is set and the diameter of the resin collar is 10 mm. This figure shows that when the thickness is 1.5 mm or more, the inclination accuracy is much better than when the thickness is less than 1.5 mm. Therefore, it is desirable that the thickness of the resin collar be 1.5 mm or more. Figures 25-a and 25-b show a top surface and a cross section of another embodiment, respectively, and show a resin collar portion and a resin protrusion portion 4 that are in contact with one surface of the metal plate.
1 have the same cross-sectional dimensions, that is, the resin collar and the resin protrusion on one surface are the same, and the same effect can be obtained in this case as well. FIG. 26 shows still another embodiment, with a central through hole 114 directly below the resin protrusion and through holes 1 located on the circumference.
11... are continuous, and FIG. 27 shows a case where both through holes 111, 112..., 114 are connected by a straight groove-shaped through hole 115. Composite molded products using plates are effective when used in areas subject to rotational torque. Figure 28 shows the central through hole 11 directly below the resin protrusion.
This graph shows the relationship between the radius of curvature of the joint between 4 and the straight groove-shaped through hole 115 and the time for cracking to occur when continuously heated at 90°C. It shows that the cracking generation time (h) is set and the radius of curvature is desirably 1 mm or more. Figures 29-a and 29-b show still another embodiment, in which the resin protrusion 42 is rectangular. The resins used in the present invention include polyacetal, polypropylene, acrylonitrile/butadiene rubber/styrene copolymer (ABS resin), polystyrene, acrylonitrile/acrylic rubber/styrene copolymer (AAS resin), and acrylonitrile/ethylene propylene rubber/styrene copolymer. Thermosetting of polymers (AES resin), thermoplastic resins such as nylon 6, nylon 66, nylon 12, polysulfon, polyether sulfon, polyphenylene sulfide, polyphenylene oxide, epoxy resin, unsaturated polyester resin, etc. Polymer resins and mixtures of these resins with inorganic fillers or organic fillers are used, but the present invention is not limited to these. Figure 30 a, b, c, d, e, and f show the results when polyacetal, 30% glass fiber polyacetal, nylon 6, 20% glass fiber polybutylene terephthalate, ABC resin, and polypropylene blended with calcium carbonate are used as resins, respectively. The warpage rate ε (%) of the metal plate is shown in relation to the molding conditions, and the case where the metal plate deforms toward the resin protrusion is indicated as +, and the opposite case is indicated as -. The horizontal axis shows cylinder temperature (℃) and injection pressure (MPa and kg).
f/cm ² ) Mold temperature (°C) and injection time (s) are plotted, and the warpage rate ε (%) is plotted on the vertical axis.
The results of this experiment showed that a steel plate of a certain shape had two through-holes directly below the resin protrusions and three through-holes located on the circumference concentric with these.
The warp rate was measured after forming the resin layer on the brim at t ₁ and t _2. In the figure, , , and indicate the cases where t ₁ /t ₂ = 2.3, 1.5, 1.1, and 0.67, respectively. The measurements were made under the following conditions except for the molding conditions on the respective horizontal axes. (a) and (b) θ _c (cylinder temperature): 200℃ P (injection pressure): 98MPa (1000Kgf/cm ² ) θ _d (mold temperature): 60℃ t _i (injection time): 8s (c) θ _c : 190℃ P: 98MPa (1000Kgf/cm ² ) θ _d : 70℃ t _i : 8s (d) θ _c : 255℃ P: 98MPa (1000Kgf/cm ² ) θ _d : 90℃ t _i : 8s ( e) θ _c : 240℃ P: 98MPa (1000Kgf/cm ² ) θ _d : 40℃ t _i : 8s (f) θ _c : 220℃ P: 98MPa (1000Kgf/cm ² ) θ _d : 40℃ t _i : 8s The upper limit of temperature is determined by the deterioration of the resin, the upper limit of injection pressure and injection time is determined by the occurrence of burrs, and the lower limit of temperature, injection pressure and injection time is determined by the limit that can completely fill the mold with resin. This measurement result shows that polyacetal, nylon 6, ABS resin, and polypropylene containing calcium carbonate are superior in terms of warpage rate, but nylon 6 easily absorbs water, and polypropylene deteriorates due to contact with metals. ABS resin does not have good weather resistance. On the other hand, polyacetal shows good results in these respects, is less deformed, and has good moldability, making it the most suitable for composite molded products. Compared to conventional composite molded products, the composite molded product of the present invention has better inclination accuracy of the resin protrusion, less deformation of the molded product, and less unbalanced residual stress, so it can last for a long time. Dimensional changes are small when used, and strength is increased when external forces are applied. Therefore, from the viewpoint of durability, it can be used for a long period of time with good precision and without cracks. Also, unlike conventional composite molded products,
Since the resin flange has little warpage, no trouble will occur even if it is applied to a component that drives other drive components near the surface of a composite molded product. Therefore,
It can also be applied to precision parts that were not previously applicable. In other words, in the past, protrusions that required precision were fixed by caulking a metal rod to a metal plate, which required a manufacturing process in which each protrusion was caulked one by one.However, in the case of the present invention, resin Since all the protrusions can be molded in a single injection molding process, the manufacturing process can be significantly streamlined and the cost of the product can be reduced. As described above, the composite molded product of the metal plate and resin of the present invention makes it possible to provide this type of composite molded product with good dimensional accuracy, and has great industrial effects.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the configuration of a conventional composite molded product and a state with poor tilt accuracy. Figure 2 is a cross-sectional view showing the configuration of a mold for molding the composite molded product. Figure 3-a is a cross-sectional view of the conventional composite molded product. A cross-sectional view of another example of the molded product, Figure 3-b is a cross-sectional view showing the direction of the force applied to the resin collar shown in Figure 3-a, and Figure 3-c is shown in Figure 3-a. A sectional view schematically showing the deformed state of the resin collar portion, FIGS.
Figure 3-b is a cross-sectional view showing the direction in which the resin collar portion of the composite molded product having the shape shown in Figure 3-a is deformed due to residual stress due to the presence of the runner portion, and a cross-sectional view schematically showing the deformed state. 6 is a characteristic diagram showing the relationship between resin temperature and δ/h in the composite molded products shown in FIGS. 3 and 4, FIG. 7 is a sectional view showing another example of the conventional composite molded product, and FIG. -Figure a and 8th-
Figure b is a top view and a sectional view of one embodiment of the composite molded article of the present invention, Figures 9-a and 9-b are a top view and a sectional view of another embodiment, respectively, and Figure 10-a. FIG. 10-b is a top view and a sectional view showing still another embodiment, and FIG. 11-a is a top view and a cross-sectional view showing still another embodiment.
Figures 11-b and 11-c are top views, cross-sectional views, bottom views, 12-a, 12-b, and 12-c of other embodiments, respectively.
Figure c is a top view, cross-sectional view, and bottom view of other embodiments, respectively, and Figure 13 schematically shows the deformed state of the resin collar in the case of two through holes shown for comparison with the present invention. 13-a and 13-b are a top view, a cross-sectional view, and a first
Figure 4-a and Figure 14-b each show a through hole 2 having a runner portion for comparison with the present invention.
A top view and a sectional view schematically showing the deformed state of the resin collar in the case of 15-a and 15-b.
15-c are a top view, a cross-sectional view, and a side view schematically showing the deformed state of the resin collar in the case of two through holes having the same runner portion, respectively;
FIG. 16 is a characteristic diagram showing the relationship between the ratio of the projected area in the metal plate surface direction of the through hole directly below the resin protrusion of the composite molded product of the present invention and the resin collar portion, and the inclination accuracy of the resin protrusion, and FIG. 17 18-a is a special bar diagram showing the relationship between the thickness of the metal plate and the inclination accuracy of the resin protrusion of the composite molded product of the present invention, and FIG. 18-a is a characteristic diagram showing the relationship between the thickness of the metal plate and the warpage rate. , Figure 18-b is a cross-sectional view showing the definition of warpage rate, Figure 19 is a characteristic diagram showing the relationship between through holes and residual stress, and Figure 20 is a diagram showing the relationship between the diameter of the circle where the through hole is installed and the residual stress. Characteristic diagrams showing the relationship with stress, Figures 21-a and 21-
Figure b is a schematic diagram showing the relationship between the through hole and the resin in the through hole, Figure 21-a is a cross-sectional view, Figure 21-b is a longitudinal cross-sectional view, and Figure 22 is the center directly below the resin protrusion. FIG. 23 is a cross-sectional view schematically showing the direction of residual stress generated in the resin collar when it has through holes and through holes arranged on the circumference, and FIG. 23 is a conventional composite molded product having a runner part. 24 is a cross-sectional view schematically showing the relationship between the through hole and the resin in the through hole, and FIG. 24 is a characteristic diagram showing the relationship between the thickness of the resin collar and the inclination accuracy of the resin protrusion of the composite molded product of the present invention. , 25-a and 25-b are a top view and a sectional view of another embodiment, respectively, FIGS. 26 and 27 are a plan view of a through hole of another embodiment, and 28. The figure is a characteristic diagram showing the relationship between the radius of curvature of the straight groove joint part of the through hole and the crack generation time in continuous heating in the embodiment shown in Fig. 27, and Figs. 29-a and 29-b are respectively according to the present invention. A top view and a sectional view of another example of the composite molded product, and FIG. 30 are characteristic diagrams showing the relationship between molding conditions and warpage rate of the resin used in the composite molded product of the present invention. 111, 112, 113...through hole, 114...
... central through hole, 115 ... (straight groove-shaped) through hole, 2 ... metal plate, 35, 36 ... resin collar part,
4...Resin protrusion, 51...Runner part, 9...
Resin (in the through hole).

Claims (1)

[Scope of Claims] 1. A metal plate having a through hole and a resin protrusion protruding from the plane of the metal plate, wherein the resin is absorbed by the resin in the through hole that is integrated with the resin protrusion. In a composite molded product of a metal plate and resin that locks a protrusion to the metal plate, the through hole is located at a central through hole provided directly below the resin protrusion and at a peripheral portion of the central through hole. an auxiliary through hole, which contacts the metal plate on the side where the resin protrusion is provided and covers at least a portion of the central through hole and the auxiliary through hole, and the side where the resin protrusion is not provided; A composite molded product of a metal plate and resin, characterized in that it has a resin collar that contacts the metal plate and covers only the central through hole. 2. In the composite molded product, the resin collar is a plate-shaped body defined by a plane parallel to a plane defining both surfaces of the metal plate.
Composite molded product of metal plate and resin as described in section. 3. The metal according to claim 1, wherein in the composite molded product, the ratio of the projected areas of the central through hole and the resin collar portion to a plane defined by the surface of the metal plate is 1/15 or less. Composite molded product of plate and resin. 4. The composite molded product of a metal plate and resin according to claim 1, wherein in the composite molded product, the resin collar portion and the protrusion portion are made of polyacetal. 5. The composite molded product of a metal plate and resin according to claim 1, wherein in the composite molded product, the resin collar portion that contacts one surface of the metal plate is the same as the resin protrusion. .