JP5528781B2 - Injection mold and method of manufacturing composite product - Google Patents

Description

  The present invention relates to an injection mold and a manufacturing method for obtaining a composite product in which a decorative layer is formed on the surface of a metal body and a resin portion is formed on the back surface.

Molded products in which a metal material and a resin are integrated are used in various fields such as automobiles, household appliances, mobile phones, and personal computers. As a method of manufacturing a composite product of a metal and a resin by bonding a resin to a metal material, a method using injection molding with a resin or a method in which an adhesive layer is applied to the surface of a metal and a resin layer is bonded is adopted. It has been.
In addition, the surface of the metal material is decorated by painting, sublimation transfer, laser printing, hot stamping, silk printing, or the like.

  When decorating the resin part at the same time as injection molding, as shown in FIG. 19A, for example, a transfer sheet 12 is arranged as a decorating sheet on the second mold 2 forming the cavity, and the second mold 2 After suctioning along the cavity surface by the suction part provided in the first mold 1, the first mold 1 is clamped and the resin is injected as shown in FIG. At this time, a part of the transfer sheet 12 is separated from the cavity surface of the second mold 2 as shown in FIG. However, the transfer sheet 12 is stretched by the heat and pressure of the molten resin injected thereafter, and follows the cavity surface of the second mold 2. In this case, when the first mold 1 and the second mold 2 are clamped, a cavity is formed between them. Therefore, as described above, even when the transfer sheet 12 is not in close contact with the second mold 2 at the time of clamping, there is a possibility that the transfer sheet 12 is rubbed and damaged when the first mold 1 is clamped. Few. For this reason, no particular problem arises even if the cavity of the second mold 2 has a deep-drawn shape to some extent.

However, as shown in FIG. 20, when the metal material 20 having the same shape as the cavity is inserted and the resin portion 30 is formed on the back surface while decorating the surface of the metal material 20, the transfer sheet 12 is clamped. In this case, the metal material 20 comes into close contact. Furthermore, since the metal material 20 and the transfer sheet 12 and the cavity surface of the second mold 2 are almost completely in close contact with each other, the transfer sheet 12 is deformed to a substantially product shape at the time of clamping. Therefore, the transfer sheet 12 is strongly rubbed by the second mold 2 and the metal material 20 at a portion having a large curvature in the metal material 20, such as a crack in the decorative layer or a damage to the base film of the transfer sheet 12. Inconvenience was easy to occur.
Further, at the time of mold clamping, although the first mold 1 and the second mold 2 are heated to some extent, the metal material 20 is usually in a cold state. Therefore, it cannot be said that the transfer sheet 12 in contact with the metal material 20 is easily softened. Therefore, the transfer sheet 12 was more easily damaged during mold clamping.

  Then, this invention aims at obtaining the manufacturing method of the metal mold | die for injection molding which can perform favorably with the decoration of the surface of a metal material, and shaping | molding of the resin part of a back surface.

A first characteristic configuration of an injection mold according to the present invention is a composite product in which a decorative layer is formed on the surface of a metal body having a convex portion and a resin portion is formed on the back surface of the metal body. An injection mold used for manufacturing,
A first mold in which the metal body is disposed;
A second mold that clamps with the first mold to form a cavity for resin injection between the first mold and the metal body;
Before clamping the first mold and the second mold, the decorative sheet is disposed at a position away from the mold surface of the second mold, and the decorative sheet is pressed against the convex portion of the metal body. On the other hand, there is a decorative sheet holding mechanism that is brought into contact with the convex portion.

  When producing a composite product in which a decorative layer is formed on the surface of a metal body having a convex portion and a resin portion is formed on the back surface of the metal body as in this configuration, an injection mold Since the decorative sheet is disposed at a position away from the mold surface of the second mold by the decorative sheet holding mechanism, the decorative sheet is brought into contact with the surface of the metal body without contacting the second mold before clamping. It can be along the convex part of the metal body. That is, when the decorative sheet is pressed against the convex portion of the metal body, the decorative sheet can be extended without being obstructed by the second mold, and can follow the convex portion of the metal body. In this way, the decorative sheet holding mechanism is used to place the decorative sheet on the convex portion of the metal body before clamping, and then the mold clamping is completed, so that the cavity of the second mold is deep drawn. Even when the mold is clamped, a good composite product can be produced without tearing the decorative sheet.

  The second characteristic configuration of the injection mold according to the present invention lies in that a suction part is provided in the first mold and sucks the decorative sheet.

  When the decorative sheet is pressed against the convex part of the metal body, the decorative sheet is held along the central part of the convex part of the metal body, but the decorative sheet located on the periphery of the decorative sheet is lifted May be separated from the body surface. If it becomes so, the decoration sheet located in the periphery of a metal body will be along with the surface of a metal body in the case of mold clamping, and it may be forcibly stretched and sheet | seat tear may generate | occur | produce. Therefore, as in this configuration, a suction part that sucks the decorative sheet is provided in the first mold. If it carries out like this, when making a decoration sheet go along the convex-shaped part of the metal body arrange | positioned at a 1st type | mold, a decoration sheet can be attracted | sucked to the 1st type | mold side. Therefore, by sucking the decorative sheet at the suction part before mold clamping, the decorative sheet can be surely placed along the entire surface of the metal body, and the decorative sheet can be broken at the periphery of the convex part of the metal body. Can be prevented.

  According to a third characteristic configuration of the injection mold according to the present invention, the decorative sheet holding mechanism is provided on the mold surface of the second mold and elastically biased toward the mold surface. A clamp and a second clamp that is elastically biased in a direction protruding from the mold surface and sandwiches the decorative sheet with the first clamp.

  Thus, a decorating sheet can be arrange | positioned in the position spaced apart from the mold surface of a 2nd type | mold by pinching a decorating sheet with a 1st clamp and a 2nd clamp. As a result, when the mold is clamped, even if the first mold is brought close to the second mold side, the first mold contacts the decorative sheet, and the decorative sheet is pushed out to the second mold side. The sheet does not contact the second mold. In other words, since the decorative sheet is pressed against the second mold with the decorative sheet sufficiently aligned with the first mold, the friction of the decorative sheet with respect to the first mold or the second mold is minimized. It is done. Therefore, it is possible to clamp the decorative sheet in a state in which the decorative sheet is kept healthy, and it is possible to manufacture a composite product having excellent quality.

  According to a fourth characteristic configuration of the injection mold according to the present invention, the decorative sheet holding mechanism is set so that an elastic biasing force of the second clamp is larger than an elastic biasing force of the first clamp. There is a point.

In this way, by setting the elastic biasing force of the second clamp larger than the elastic biasing force of the first clamp, the second clamp is maintained in a state of protruding from the mold surface of the second mold. That is, the decorative sheet is separated from the second mold, and the pressing operation of the decorative sheet against the first mold becomes easy.
Furthermore, if it is this structure, the clamping force which clamps a decoration sheet is mainly determined by the elastic urging | biasing force of a 1st clamp. That is, when the first mold is pressed against the decorative sheet, the urging force of the first clamp is set to such an extent that the decorative sheet can surely adhere to the first mold. After that, when the first mold comes into contact with the first clamp, the first clamp and the second clamp move to the second mold side in a state where the decorative sheet is properly sandwiched, and the mold clamping is completed. .
Thus, by appropriately setting the urging force of the first clamp and the urging force of the second clamp, the pressing of the decorative sheet against the first mold and the subsequent mold clamping are extremely smoothly and reliably performed. It can be carried out.

  The fifth characteristic configuration of the injection mold according to the present invention is that the first mold supports the back surface of the metal body before mold clamping, retreats after mold clamping, and is separated from the back surface of the metal body. The metal support portion for forming the cavity surface is provided.

  When the metal body which comprises a composite article is thin plate shape, a metal body may deform | transform at the time of mold clamping. Therefore, as in this configuration, a metal body support portion is provided, the mold is clamped in a state where the back surface of the metal body is supported by the metal body support portion, and the metal body support portion is retracted after the mold is clamped. To form a cavity surface. By doing so, deformation of the metal body during mold clamping is suppressed, and a resin portion can be formed on the entire back surface of the metal body.

  A sixth characteristic configuration of the injection mold according to the present invention is that the decorative sheet holding mechanism includes a sheet sliding portion that allows movement of the decorative sheet with a constant tension.

  In this configuration, when the decorative sheet is pressed against the convex portion of the metal body before clamping, if the fixed tension is applied to the sheet sliding portion of the decorative sheet holding mechanism, the decorative sheet is allowed to move. The That is, in consideration of the pressing force of the decorative sheet on the first mold and the possibility of the decorative sheet being damaged by the pressing, the decorative sheet is the first when a certain pressing force acts on the decorative sheet. Set to slide with the clamp. Thereby, pressing of the decorating sheet to a 1st type | mold can be performed reliably, preventing the failure | damage of a decorating sheet.

The first characteristic means of the method for producing a composite product according to the present invention includes a step of arranging a metal body having a convex portion on the first mold,
A decorative sheet is disposed at a position spaced from the mold surface of the second mold, and the decorative sheet is placed in contact with the convex portion of the metal body while pressing the decorative sheet against the convex portion of the metal body, and
Clamping the first mold and the second mold to form a cavity for resin injection between the first mold and the metal body;
And a step of injecting resin into the cavity and filling the back surface side of the metal body with resin.

  By this characteristic means, the decorative sheet is first placed on the convex portion of the metal body before the first mold and the second mold are clamped, and then the mold clamping is completed. Since the decorative sheet is arranged at a position spaced from the mold surface of the second mold, when the decorative sheet is pressed against the convex portion of the metal body, the elongation of the decorative sheet is not hindered by the second mold, and the metal body The decorative sheet is surely stretched along the convex portion of. Thus, the decorative sheet is placed along the convex part of the metal body before mold clamping, and then the mold clamping is completed, so that the decorative sheet can be used during mold clamping even if the second mold cavity is deep drawn. It was possible to produce a composite product in which the metal surface was decorated without tearing.

  The 2nd characteristic means of the manufacturing method of the composite article which concerns on this invention exists in the point which was made to attract | suck the said decorating sheet with the suction part provided in the said 1st type | mold in the said decorating sheet arrangement | positioning process.

  When the decorative sheet is pressed against the convex part of the metal body, the decorative sheet is held along the central part of the convex part of the metal body, but the decorative sheet located on the periphery of the decorative sheet is lifted May be separated from the body surface. If it becomes so, the decoration sheet located in the periphery of a metal body will be along with the surface of a metal body in the case of mold clamping, and will be forcibly stretched, As a result, sheet | seat tear may generate | occur | produce. Therefore, as in the feature means, in the decorative sheet arrangement step, the decorative sheet is sucked by the suction part provided in the first mold. If it carries out like this, the decorating sheet located in the periphery of the convex part of the metal body arrange | positioned at a 1st type | mold will be attracted | sucked by the suction part to the 1st type | mold side, and a decorating sheet will be surely followed by the whole surface of a metal body. Can be made. Therefore, the decoration sheet can be prevented from being broken at the periphery of the convex portion of the metal body.

The third characteristic means of the method for producing a composite article according to the present invention is, instead of the decorative sheet arranging step and the step of forming the resin injection cavity,
The decorative sheet is disposed at a position separated from the mold surface of the second mold, and the decorative sheet is placed on the convex portion of the metal body during the clamping of the first mold and the second mold. While pressing, it is made to contact along the said convex-shaped part, and it is in the point provided with the process of forming the cavity for resin injection | pouring between the said 1st type | mold and the said metal body by subsequent mold clamping.

  With this feature, the decorative sheet is placed along the convex part of the metal body in the middle of mold clamping just by performing normal mold clamping, and when the mold clamping is completed, a cavity for resin injection is formed. Can do. Therefore, it is not necessary to perform the decorating sheet arrangement process and the resin injection cavity forming process separately, the manufacturing process is simplified, and the production of the composite product can be speeded up.

It is a figure which shows the structure of the metal mold | die which concerns on 1st Embodiment. It is a figure which shows the state which clamped the decorating sheet which concerns on 1st Embodiment. It is a figure which shows the state which pressed the 1st type | mold on the decorating sheet. It is a figure which shows the state which the mold clamping was completed. It is a figure which shows the state of the resin injection | pouring which concerns on 1st Embodiment. It is a figure which shows the state after the mold opening which concerns on 1st Embodiment. It is a figure which shows the state which took out the composite goods which concern on 1st Embodiment. It is a figure which shows the state which clamped the decorating sheet which concerns on 2nd Embodiment. It is a figure which shows the state which pressed the 1st type | mold on the decorating sheet. It is a figure which shows the state which the mold clamping which concerns on 2nd Embodiment was completed. It is a figure which shows the state which clamped the decorating sheet which concerns on 3rd Embodiment. It is a figure which shows the state which pressed the 1st type | mold on the decorating sheet. It is a figure which shows the state which the mold clamping which concerns on 3rd Embodiment was completed. It is a figure which shows the state which clamped the decorating sheet which concerns on 4th Embodiment. It is a figure which shows the state which pressed the 1st type | mold on the decorating sheet. It is a figure which shows the state which the mold clamping which concerns on 4th Embodiment was completed. It is a figure which shows the detail of the decorating sheet holding mechanism which concerns on another embodiment. It is a figure which shows the operation | movement procedure of the metal mold | die which concerns on another embodiment. It is sectional drawing which shows the conventional in-mold shaping | molding method. It is sectional drawing which shows the conventional in-mold shaping | molding method.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
1-7 is a figure which shows the formation process of the composite article by the metal mold | die which concerns on this invention altogether.
The resin molded product according to the present invention includes a metal body 20 having a convex portion 20a, a decorative layer formed on the surface of the metal body 20, and a resin portion 30 formed on the back surface of the metal body 20. It is manufactured through the following manufacturing process.

[Metal body]
The metal body 20 is a metal press plate etc. which have the convex-shaped part 20a, for example. A surface treatment such as application of an adhesive is performed in advance on the surface of the metal body 20 so that the decoration layer is easily formed, or a sheet on which the decoration layer is easily bonded is attached in advance. In addition, an adhesive layer is applied in advance as a coating or a sheet so that the injected resin is easily fixed on the back surface of the metal body 20, or a layer having high adhesiveness is formed by chemical treatment. For the surface treatment of the metal body 20 and the coating material for the front and back surfaces, a material that is suitable for each combination of the metal body 20 and the decorative layer formed on the front surface and the resin that is injected onto the back surface and forms the resin portion is selected. There is a need. In some cases, the product may warp due to adhesion between the metal body 20 and the resin. In this case, the resin is not intentionally fixed to the metal body at the time of injection, and may be fixed by an adhesive or the like in a subsequent process.

[First type]
The first mold 1 is formed with a cavity surface 1A on which the metal body 20 is disposed. The cavity surface 1A has a shape corresponding to the shape of the back surface of the metal body 20, and is provided with a gate 11 for injecting resin into a cavity V to be formed later.

[Slide type]
Inside the cavity surface 1 </ b> A of the first mold 1, a slide mold 3 is provided that can move relative to the first mold 1 in the mold clamping direction. Before the mold clamping, the slide mold 3 supports the metal body 20 by contacting the tip surface 3A with the back surface of the metal body 20, and when retracted after the mold clamping, the tip surface 3A is separated from the back surface of the metal body 20, and the tip surface 3A is the cavity surface 1A. Form a part of That is, the tip surface 3A functions as a metal body support portion. When the slide mold 3 is held at a position along the cavity surface 1A during the resin injection, the resin portion 30 is formed on the entire back surface of the metal body 20 by the injected molten resin. When the front end portion 3a of the slide mold 3 protrudes into the cavity V and the front end surface 3A presses the back surface of the metal body 20, the resin portion 30 is formed only at the peripheral edge of the back surface of the metal body 20 by the injected molten resin. The

[Second type]
A cavity surface 2A having a shape along the surface of the metal body 20 is formed in the second mold 2, and the metal body 20 and the cavity surface 1A are clamped by clamping the first mold 1 and the slide mold 3. A cavity space V corresponding to the resin portion 30 is formed therebetween. Moreover, the 2nd type | mold 2 is comprised so that the transfer sheet 12 may be arrange | positioned as a decorating sheet along 2 A of cavity surfaces in the case of mold clamping. When the arrangement of the metal body 20 on the cavity surface 1 </ b> A of the first mold 1 is completed, the transfer sheet 12 is disposed between the metal body 20 and the second mold 2. The transfer sheet 12 includes a decorative layer (transfer layer) 12a and a base sheet 12b, and the decorative layer (transfer layer) 12a decorates the surface of the metal body. The transfer sheet 12 may be, for example, a roll-shaped long film that is unfolded at the position, a sheet that is cut according to the outer shape of the metal body 20, or larger than the metal body 20. Arbitrary shapes (for example, a rectangular branch leaf sheet) may be sufficient. Moreover, you may make it decorate the surface of the metal body 20 with this insert sheet using the insert sheet with which the decorating layer and the base sheet were united as a decorating sheet.

  As a decorative sheet holding mechanism, the mold surface 2a of the second mold 2 has a first clamp 4 elastically biased toward the mold surface 2a and a second clamp elastically biased in a direction protruding from the one surface 2a. 5 is provided. Specifically, as shown in FIG. 1, the first clamp 4 has an operating rod 6 penetrating the inside of the second mold 2 attached to the movable plate 7 of the space portion 2 </ b> B provided inside the second mold 2. Yes. The space 2B is provided with a fixed plate 8 at a position closer to the mold surface 2a than the movable plate 7, and the fixed plate 8 is connected to the movable plate 7 via an elastic member 9 such as a spring. The elastic member 9 biases the movable plate 7 in a direction away from the mold surface 2a. As a result, the first clamp 4 is elastically biased toward the one surface 2a. The second clamp 5 is attached to the recess 2C of the mold surface 2a via an elastic member 10 such as a spring. The elastic member 10 is biased in a direction protruding from the mold surface 2a of the second mold 2, and the second clamp 5 is normally held at a position protruding from the mold surface 2a.

  Here, the elastic biasing force of the elastic member 10 that biases the second clamp 5 in the direction protruding from the mold surface 2a is the elastic force of the elastic member 9 that biases the first clamp 4 in the direction protruding from the mold surface 2a. It is set to be greater than the power. By doing so, when the first clamp 4 and the second clamp 5 abut and hold the transfer sheet 12, the transfer sheet 12 can be separated from the mold surface 2a by a predetermined distance. The predetermined distance for separating the transfer sheet 12 from the mold surface 2a is preferably a distance at which the transfer sheet 12 and the mold surface 2a of the second mold 2 do not contact each other during mold clamping. Further, at the time of mold clamping, the holding surface of the transfer sheet 12 of the second clamp 5 is pressed by the first clamp 4 and finally retracts to a position along the mold surface 2a.

  When the operating plate 7 receives a pressing force from an eject rod, an air cylinder or the like and moves in a direction approaching the second mold surface 2a against the elastic member 9, the operating rod 6 also moves in the same direction, and the first The clamp 4 is separated from the second clamp 5. That is, the first clamp 4 is separated from the second clamp 5 and is at a position where the transfer sheet 12 is allowed to move. On the other hand, when the operating plate 7 does not receive the pressing force of the eject rod, the air cylinder, etc., the operating plate 7 receives the elastic biasing force of the elastic member 9 and moves away from the second mold surface 2a. The operating rod 6 also moves in the same direction, and the first clamp 4 abuts on the second clamp 5. That is, the first clamp 4 comes into contact with the second clamp 5 and is in a position to hold the transfer sheet 12 in between.

[Gate]
The first mold 1 is provided with a gate 11 for injecting molten resin. The gate 11 is formed on the cavity surface 1A so as to face the back surface of the metal body 20 disposed on the cavity surface 1A. In a state where the mold is clamped, the molten resin is injected from the gate 11 into the cavity V formed between the metal body 20 and the cavity surface 1A.

[Resin molding process]
As shown in FIG. 1, the metal body 20 is arranged at a predetermined position of the first mold 1 by using a manipulator or the like not shown, and between the second mold 2 and the metal body 20 arranged in the first mold 1. The transfer sheet 12 is disposed on the surface. At this time, the slide mold 3 protrudes from the cavity surface 1 </ b> A of the first mold 1 and supports the back surface of the metal body 20. The metal body 20 disposed on the cavity surface 1A of the first mold 1 is sucked and held by a suction hole (not shown) provided in the first mold 1 or the slide mold 3.

  As shown in FIG. 2, after the transfer sheet 12 is sandwiched and held by the first clamp 4 and the second clamp 5, the transfer sheet 12 is heated with a heater as necessary, and the first mold 1 is replaced with the second mold. Close the 2 and start clamping. At this time, the transfer sheet 12 is held in a state separated from the mold surface 2a of the second mold 2 by a predetermined distance.

  As shown in FIG. 3, during clamping, the transfer sheet 12 is brought into contact with and pressed against the convex portion 20 a on the surface of the metal body 20, and the transfer sheet 12 gradually contacts the convex portion 20 a on the surface of the metal body 20. Follow along. By holding the transfer sheet 12 in a state separated from the mold surface 2a of the second mold 2 by a predetermined distance, it is possible to place the transfer sheet 12 along the surface of the metal body before clamping, so that the transfer sheet 12 can be When tightening, it was possible to suppress the problem of being stretched and broken at a stretch.

  As shown in FIG. 4, when the clamping of the first mold 1 and the second mold 2 is completed, the transfer sheet 12 is disposed along the surface of the metal body 20, and the back surface of the metal body 20 and the first mold A cavity V is formed between 1.

  Next, as shown in FIG. 5, molten resin is injected into the formed cavity V from the gate 11 provided in the first mold 1. At this time, the back surface of the metal body 20 is pressed toward the second mold 2 by the molten resin injected into the cavity V. Further, since the molten resin to be injected is a thermosetting resin or a thermoplastic resin and has a high temperature, the back surface of the metal body 20 is heated at the time of resin injection. Furthermore, when the back surface of the metal body 20 is heated to a high temperature, heat is conducted to the surface of the metal body 20 and the temperature is increased. Thus, the resin portion 30 is formed on the back surface of the metal body 20 by the injected molten resin, and heat and pressure also act on the surface of the metal body 20, so that the transfer sheet 12 is adhered to the surface of the metal body 20. The Rukoto.

  As shown in FIG. 6, when the mold clamping is released after the resin is cured, the second clamp 5 is protruded. After that, as shown in FIG. 7, the composite product P is pushed out by an extrusion bar (not shown) provided in the first mold 1 or the slide mold 3 to take out the composite product P, and the first clamp 4 is moved to the mold surface. The sheet is moved from 2a in the protruding direction, and the transfer sheet 12 is resumed.

  As for the obtained composite article P, the surface of the metal body 20 is decorated by the decoration layer (transfer layer) 12a, and the resin part 30 is shape | molded on the back surface. Thus, with the mold according to the present invention, the resin part 30 is molded on the back surface of the metal body 20, and the surface of the metal body 20 can be decorated simultaneously with the molding of the resin part 30.

[Second Embodiment]
In this embodiment, only a configuration different from the configuration of the first embodiment will be described, and the description of the same configuration will be omitted. 8 is a diagram showing the positioning and holding of the transfer sheet 12, FIG. 9 is a diagram showing the middle of mold clamping, and FIG. 10 is a diagram showing after the mold clamping.

  In the embodiment, as shown in FIG. 8, the first mold 1 includes a suction portion 13 that sucks the transfer sheet 12 around a portion of the cavity surface 1 </ b> A that holds the metal body 20. In the first mold 1, an O-ring 14 is disposed in a portion where the first clamp 4 is recessed when the mold is clamped.

[Resin molding process]
As shown in FIG. 8, after the transfer sheet 12 is sandwiched and held by the first clamp 4 and the second clamp 5, the transfer sheet 12 is heated with a heater as necessary, and the first mold 1 is changed to the second mold. Close the 2 and start clamping. When the metal body 20 is thick and the temperature from the resin is not sufficiently transmitted to the surface of the metal body 20, the metal body 20 may be preheated on a manipulator or in a mold.

  As shown in FIG. 9, during clamping, the transfer sheet 12 is brought into contact with and pressed against the convex portion 20 a on the surface of the metal body 20, and the transfer sheet 12 is gradually pressed against the convex portion 20 a on the surface of the metal body 20. Follow along. Further, the transfer sheet 12 is sucked from the suction portion 13 in a state where the first clamp 4 is in contact with the O-ring 14 of the first mold 1, thereby facilitating the transfer sheet 12 along the surface of the metal body 20.

  As shown in FIG. 10, when the clamping of the first mold 1 and the second mold 2 is completed, the transfer sheet 12 is disposed along the surface of the metal body 20, and the back surface of the metal body 20 and the cavity surface 1A. A cavity V is formed between the two. Thereafter, injection molding using a resin is performed in the same manner as in the first embodiment, and a composite product P is obtained.

[Third Embodiment]
A third embodiment of the present invention is shown in FIGS. In this embodiment, as shown in FIG. 11, a slide mold 3 that is movable relative to the first mold 1 along the mold clamping direction of the first mold 1 is provided inside the first mold 1. The metal body 20 is disposed on the surface. The transfer sheet 12 is held by a clamp 15 along the mold surface 1a of the first mold, and this clamp 15 functions as a decorative sheet holding mechanism.

[Resin molding process]
As shown in FIG. 11, the slide mold 3 is held at a position retracted from the mold surface 1 a of the first mold 1, and the metal body 20 is disposed on the tip surface 3 </ b> A of the slide mold 3. A transfer sheet 12 is disposed on the mold surface 1a of the first mold.

  Next, if necessary, after heating the transfer sheet 12 with a heater or the like, as shown in FIG. 12, the slide mold 3 is advanced along the mold clamping direction of the first mold 1, and the surface of the metal body 20 is moved. The transfer sheet 12 is brought into contact with the surface of the metal body 20 before clamping.

  Next, as shown in FIG. 13, the second mold 2 is brought close to the first mold and the mold is clamped, and a cavity V is formed between the back surface of the metal body 20 and the front end surface 3 </ b> A of the slide mold 3. Thereafter, injection molding using a resin is performed to obtain a composite product P.

[Fourth Embodiment]
A fourth embodiment of the present invention is shown in FIGS. In this embodiment, as shown in FIG. 14, the transfer sheet 12 is held by the clamp 15 so as to be along the mold surface 1a of the first mold 1, and this clamp 15 functions as a decorative sheet holding mechanism. Further, the first mold 1 is provided with a suction portion 13 for sucking the transfer sheet 12.

[Resin molding process]
As shown in FIG. 14, the metal body 20 is disposed on the cavity surface 1 </ b> A of the first mold 1. A transfer sheet 12 is disposed on the mold surface 1 a of the first mold 1.

  Next, if necessary, after the transfer sheet 12 is heated with a heater or the like, the transfer sheet 12 is sucked toward the first mold 1 by the suction unit 13 as shown in FIG. The transfer sheet 12 is placed along the surface of the body 20.

  Next, as shown in FIG. 16, the second mold 2 is brought close to the first mold 1 and the mold is clamped to form a cavity V between the back surface of the metal body 20 and the cavity surface 1A. Thereafter, injection molding using a resin is performed to obtain a composite product P.

[Another embodiment]
(1) As shown in FIG. 17, a member for reducing friction such as Teflon (registered trademark) or a coated ring is disposed on the surface holding the transfer sheet 12 of the first clamp 4 and the second clamp 5, or You may comprise the sheet | seat sliding parts 4a and 5a which give the process which reduces friction and accept | permit the movement of the transfer sheet 12 with fixed tension. In this way, when the transfer sheet 12 is pressed against the convex portion 20a of the metal body 20 before mold clamping, the movement of the transfer sheet 12 can be allowed by the sheet sliding portions 4a and 5a of the decorative sheet holding mechanism. Thus, by moving the transfer sheet 12 when the transfer sheet 12 is pressed against the convex portion 20a of the metal body 20, the transfer sheet 12 can be moved along the convex portion 20a of the metal body 20 without forcibly stretching it. It has become possible. In addition, when there is one clamp as in the third embodiment or the fourth embodiment, a sheet sliding portion is provided only on the surface of the clamp 15 that holds the transfer sheet 12, or a position facing the clamp 15 and the clamp 15 Both of the mold surfaces 1a of the first mold 1 are provided with seat sliding portions.

(2) In the first embodiment, even when the resin part 30 is molded on the entire back surface of the metal body 20, the injection mold having the slide mold 3 in the first mold 1 is shown. When is not deformed, the slide mold 3 may not be provided in the first mold 1. However, if the first mold 1 includes the slide mold 3, the resin portion 30 on the back surface of the metal body 20 can be selected depending on the position of the slide mold 3, and various composite products P can be easily manufactured.

(3) When the resin portion 30 is not formed on the entire back surface of the metal body 20, but only the peripheral portion is formed, for example, as shown in FIG. 18, the tip portion 3a of the slide mold 3 is formed. Is protruded into the cavity V, and the tip surface 3A is pressed against the back surface of the metal body 20 when the mold is clamped. When the molten resin is injected in a state where the tip portion 3a of the slide mold 3 protrudes into the cavity V, the molten resin is not injected into the portion where the tip surface 3A presses the back surface of the metal body 20. Therefore, the resin part 30 is molded only at the peripheral edge of the metal body 20. However, when the heat amount of the molten resin at the time of injection and the amount of heat that can be decorated on the surface of the metal body 20 is insufficient due to the slide mold 3, the metal body 20 may be preheated as described above.

(4) In the embodiment shown in (3), the slide mold 3 is movable relative to the first mold 1 in the mold clamping direction so that the tip portion 3a protrudes into the cavity V. You may comprise the front-end | tip part 3a of the slide type | mold 3 which protrudes inside the cavity V as a part of 1st type | mold 1. As shown in FIG. That is, the tip part 3a of the slide mold 3 shown in FIG. 18 is configured as a protruding part of the first mold 1, and the tip surface of the protruding part presses the back surface of the metal body 20 when the mold is clamped. . If the molten resin does not flow between the back surface of the metal body 20 and the tip surface 3A when the back surface of the metal body 20 is pressed by the slide mold 3 or the tip surface 3A of the protrusion, the tip surface 3A You may press the back surface of the metal body 20 only by the peripheral part.

  The present invention relates to a decorative layer on the surface of a metal body in a composite product containing a metal used in various fields such as automobiles, household appliances, mobile phones, personal computers, regardless of interior and exterior products. Can be widely used for the manufacture of composite products in which the resin part is formed on the back surface.

1 1st type 2 2nd type 3 Slide type (metal body support part)
4 First clamp 4a Sliding part 5 Second clamp 5a Sliding parts 9, 10 Elastic member 11 Gate 12 Transfer sheet (decorative sheet)
13 Suction Part 15 Clamp 20 Metal Body 20a Convex Part 30 Resin Part V Cavity P Composite Product

Claims (9)

In addition to forming a decorative layer on the surface of a metal body having a convex part, an injection mold used for manufacturing a composite product in which a resin part is formed on the back surface of the metal body,
A first mold in which the metal body is disposed;
A second mold that clamps with the first mold to form a cavity for resin injection between the first mold and the metal body;
Before clamping the second type and the first type, along with placing a decorative sheet having the decorative layer at a position spaced from the mold surface of the second type, the decorative of the decorative sheet A mold for injection molding comprising: a decorative sheet holding mechanism for bringing the decorative sheet into contact with the convex portion while pressing a layer against the convex portion of the metal body.   The injection mold according to claim 1, further comprising a suction part that is provided in the first mold and sucks the decorative sheet.   The decorative sheet holding mechanism is both provided on the mold surface of the second mold, elastically biased toward the mold surface, and elastically biased in a direction protruding from the mold surface, The injection mold according to claim 1 or 2, further comprising a second clamp for sandwiching a decorative sheet with the first clamp.   The injection mold according to claim 3, wherein the decorative sheet holding mechanism is set so that an elastic biasing force of the second clamp is larger than an elastic biasing force of the first clamp.   The first mold is provided with a metal body support portion that supports the back surface of the metal body before mold clamping, retreats after mold clamping, and separates from the back surface of the metal body to form a cavity surface. 5. The injection mold according to any one of 4 above.   The injection mold according to any one of claims 1 to 5, wherein the decorative sheet holding mechanism includes a sheet sliding portion that allows movement of the decorative sheet with a constant tension. A method for producing a composite product in which a decorative layer is formed on the surface of a metal body having a convex portion, and a resin portion is formed on the back surface of the metal body,
Arranging a metal body having a convex portion in the first mold;
The decorative sheet having the decorative layer is disposed at a position separated from the mold surface of the second mold, and the decorative sheet is pressed while pressing the decorative layer of the decorative sheet against the convex portion of the metal body. A decorative sheet arranging step for contacting along the convex part;
Clamping the first mold and the second mold to form a cavity for resin injection between the first mold and the metal body;
And a step of injecting a resin into the cavity and filling the back side of the metal body with the resin.   The method for manufacturing a composite product according to claim 7, wherein in the decoration sheet arranging step, the decoration sheet is sucked by a suction portion provided in the first mold. Instead of the decorative sheet placement step and the step of forming the resin injection cavity,
The decorative sheet having the decorative layer is disposed at a position separated from the mold surface of the second mold, and the decorative layer of the decorative sheet is in the middle of clamping the first mold and the second mold. Is pressed against the convex portion of the metal body, the decorative sheet is brought into contact with the convex portion, and the mold is then clamped for resin injection between the first mold and the metal body. The method for producing a composite product according to claim 7 or 8, further comprising a step of forming a cavity.

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