JP5689644B2 - Method for producing component-integrated synthetic resin product and mold for the method - Google Patents

Description

  The present invention relates to a method for manufacturing a component-integrated synthetic resin product in which a component in which a component is previously placed is filled with a synthetic resin to integrally form the component and the synthetic resin, and a mold used in the method.

  2. Description of the Related Art Conventionally, a component-integrated synthetic resin product obtained by integrally forming a synthetic resin and a component molded from metal, ceramics, glass, or the like other than the synthetic resin has been used in various fields.

  As a method for producing such a synthetic resin product, after clamping, the parts are sandwiched between a pair of clamp cylinders that are simultaneously operated by the same fluid pressure source from both sides in the cavity of the mold, and the parts are positioned. And a method of filling the outer periphery of the component with a synthetic resin has been proposed (for example, see Patent Document 1).

  Also, using a horizontal molding machine, the positioning block is supported by a spring for buffering the glass and supported by a spring clamp incorporated in the male mold, and a suction pipe is screwed into the positioning block. A method has been proposed in which a component is positioned in a cavity by suction force from a vacuum pump through a suction pipe, and a male mold and a female mold are clamped and filled with resin (patent) Reference 2).

JP 2002-225091 A JP-A-5-208420

  However, in the case of the method as described in Patent Document 1, since the parts are fixed only after the cylinder is operated after clamping, the parts are not fixed when the parts are installed in the mold. It has not been possible to prevent the parts from being displaced from a predetermined position, and it has not been possible to prevent the parts from being displaced until the cylinder is operated and the parts are lifted and clamped after clamping. In addition, since it is supported with equal force from both sides of the part, that is, in the vertical direction, the part is located in the middle of the vertical direction of a pair of cylinders, and the part does not necessarily hit the upper mold (movable type) due to molding errors in the part. I couldn't get in touch. Therefore, there is a problem that the component cannot be positioned at a desired position with respect to the upper mold.

  In the case of the method described in Patent Document 2, it is necessary to use a positioning block having an area larger than that of the glass in order to cope with an error in the vertical and horizontal sizes of the glass. That is, the peripheral end portion of the positioning block needs to be a portion facing and not in contact with the glass. Then, the positioning block is pushed outward from the mold by the resin filling pressure, and a gap is formed between the glass and the female mold, and the molten resin flows into the gap. Further, the glass and the positioning block are further pushed in the male mold direction by the pressure of the resin that has flowed in, and a gap is further formed between the glass and the female mold, and the molten resin flows into the gap. Therefore, the glass and the female mold cannot be brought into close contact with each other, and positioning to the female mold cannot be performed.

  In addition, since it is a spring for buffering against glass, it does not have the function of pressing the glass against the female mold. Therefore, when the glass is thinner than the predetermined thickness, it is separated from the female mold and the molten resin flows into the gap. It will end up. Further, the glass and the positioning block are further pushed in the male mold direction by the pressure of the resin that has flowed in, and a gap is further formed between the glass and the female mold, and the molten resin flows into the gap. Therefore, the glass and the female mold cannot be brought into close contact with each other, and positioning to the female mold cannot be performed.

  Especially when used as a vertical molding machine, it is difficult to install parts on the movable upper mold before clamping, because it is difficult to install because it is against gravity. Therefore, the male mold becomes the lower fixed mold. As a result, the glass and the upper mold, which is a female mold, cannot be brought into close contact with each other, and the positioning to the female mold (movable mold) cannot be performed.

  Even if the spring has a function of pressing the glass against the female mold, in this case, the glass is pressed with the female mold, so that the mold and the glass are easily rubbed and the glass surface may be damaged. It was. Further, there are problems that the number of parts of the mold is large, the structure is complicated, the manufacture is not easy, and the cost becomes high.

  Furthermore, in the case of the methods as described in Patent Documents 1 and 2, even when it is desired to form the upper surface of the component and the synthetic resin on the outer periphery of the component flush with each other, the component and the upper die are separated at the time of clamping. As a result, there was a step between the surface of the upper mold part and the synthetic resin portion, and it was not possible to make them flush.

  The reason for positioning the component with respect to the upper die instead of the lower die is as follows. That is, in a vertical molding machine, the extrusion pin of the molded product is usually provided on the lower mold of the fixed mold, and when the molded product has an uneven portion formed of synthetic resin, the mold is opened. At this time, since the concavo-convex part sticks to the mold, when the concavo-convex part protrudes upward, the molded product sticks to the upper mold when the mold is opened and cannot be released by the ejecting pin. Therefore, by forming the concavo-convex part downward, the molded product can stick to the lower mold when the mold is opened and can be released by the ejecting pin, so that the concavo-convex part of the molded product is formed. When it is desired to insert a part in accordance with the opposite side, the part must be positioned on the upper mold.

  Therefore, the present invention is a mold with a simple configuration when manufacturing a part-integrated synthetic resin product using a vertical molding machine, and the positional deviation of the part installed in the lower mold that is a fixed mold before clamping An object of the present invention is to position the component at a predetermined position of the upper mold without shifting the right and left positions after clamping and without causing any damage to the component without causing damage to the component. It is another object of the present invention to form the surface of the component facing the upper mold and the synthetic resin portion so as to be flush with each other without a step.

  The present invention as a means for solving the problems as described above includes a fixed lower mold and an upper mold movable up and down, and the lower mold and the upper mold each include the lower mold or the upper mold. A suction pipe penetrating the upper mold is provided, each of the suction pipes having one end opened to the cavity part and the other end connected to a suction pump, and the part of the cavity part is installed at the time of mold clamping Using a vertical molding machine equipped with a mold formed thicker than the thickness of the part to be installed, after installing the part in the lower mold, the suction pump connected to the suction pipe of the lower mold is operated. The parts are sucked through the lower mold suction pipe, fixed and positioned on the lower mold, and after clamping, the operation of the suction pump connected to the lower mold suction pipe is stopped, and the parts The suction to the lower mold and the contact with the upper suction pipe. The component-integrated synthetic resin is characterized in that after the suction pump is operated and the component is sucked through the upper mold suction pipe to be fixed and positioned on the upper mold, the cavity is filled with molten resin It is a manufacturing method of a product.

  Further, in the above method, the component-integrated synthetic resin product manufacturing method is characterized in that suction of the component to the lower mold is stopped and at the same time the component is sucked to the upper mold.

  In the method described above, the component-integrated synthetic resin product manufacturing method is characterized in that after the suction of the component to the upper mold is started, the suction of the component to the lower mold is stopped.

  Further, in the above method, the shape of the portion corresponding to the component setting portion of the upper mold is made the same shape as the upper surface of the component, and the portion corresponding to the component setting portion of the upper mold and the molten resin are filled. The transition part of the location corresponding to the space part to be formed is formed on the same plane without providing a step, and is a method for manufacturing a part-integrated synthetic resin product.

  Furthermore, a fixed lower mold and an upper mold movable up and down are provided, and the lower mold and the upper mold are each provided with a suction pipe penetrating the lower mold or the upper mold, Each one end opened to the cavity part and the other end was connected to the suction pump, and when the mold was clamped, the thickness of the part installation part where the part of the cavity part was installed was thicker than the thickness of the part to be installed This is a die for integrally molding a part characterized by the following.

  Furthermore, the present invention is a vertical molding machine for manufacturing a component-integrated synthetic resin product provided with the above-described component-integrated molding die.

  According to the present invention as described above, when a part-integrated synthetic resin product is manufactured using a vertical molding machine, it is a mold having a simple configuration and is installed in a lower mold which is a fixed mold before clamping. It is possible to position the component at a predetermined position of the upper mold by preventing the positional displacement of the component and without causing the left and right positions to be shifted after the mold is clamped and in close contact with the upper mold without damaging the component. In addition, the surface of the component on the side facing the upper mold and the synthetic resin portion can be formed to be flush with each other without a step.

Cross-sectional view of parts installed in one embodiment of the present invention Cross-sectional view of an embodiment of the present invention Cross-sectional view showing a plurality of embodiments of the present invention Manufacturing process diagram of one embodiment of the present invention

  Embodiments of the present invention will be described below with reference to the drawings. The present invention includes a “fixed lower mold and an upper mold movable up and down, and the lower mold and the upper mold are each provided with a suction pipe penetrating the lower mold or the upper mold, Each suction pipe has one end opened to the cavity part and the other end connected to a suction pump. When the mold is clamped, the thickness of the part installation part where the part of the cavity part is installed is thicker than the thickness of the part to be installed Using a vertical molding machine equipped with a molded mold, after installing the parts in the lower mold, the suction pump connected to the lower mold suction pipe is operated to operate the parts via the lower mold suction pipe And then fixing and positioning to the lower mold, after clamping, stop the operation of the suction pump connected to the lower mold suction pipe, stop the suction of the parts to the lower mold, The suction pump connected to the upper suction pipe is operated to suck the upper mold. Fixed to the upper mold to suck the component via tubing, after positioning, it is a manufacturing method "of the parts integrally molded synthetic resin product, which comprises filling the molten resin into the cavity portion.

  The molding machine used in the present invention is a vertical injection molding machine. As shown in FIG. 1, the mold 1 includes a lower mold 2 that is a fixed mold and an upper mold 3 that is a movable mold. Yes.

  The lower mold 2 is provided with a recess 21 that forms the cavity 41 when the mold is clamped, and a suction tube 25 that opens into the recess 21. Further, the lower mold 2 is provided with a release pin hole 26 for releasing a molded product so as to open into the recess 21, and a protrusion pin 27 is provided in the pin hole 26. In addition, the upper die 3 is provided with a recess 31 that forms a cavity portion 41 when the mold is clamped, and a suction tube 35 that opens to the recess 31.

  The recess 21 and the recess 31 form a cavity 41 during mold clamping. At the time of mold clamping, a part installation part 44 in which the part 7 is installed is formed in the central part of the cavity part 41, and the outer part of the part installation part 44, that is, the outer part of the cavity part 41 is filled with the molten resin 42. Is formed. The space portion 42 is formed over the entire circumference of the component 7 to be installed, and synthetic resin is formed on the entire circumference of the component 7, but the space portion 42 is formed on a part of the entire circumference of the component 7 to be installed. It is also possible to form the synthetic resin on a part of the entire circumference of the component 7.

  In addition, as shown in FIG.3 (b), when forming the uneven | corrugated | grooved part of the synthetic resin of a molded article to the lower side, it forms in the planar shape without providing the recessed part 31 in the upper mold | type 3. It is good. In this case, the cavity portion 41, the component installation portion 44, and the space portion 42 are formed by the planar portion of the upper die 3 and the concave portion 21 of the lower die 2. Also, as shown in FIG. 3D, a recess 31 is provided, but only the part 7 is inserted into the recess 31 and is made to have the same shape as the upper part of the part 7 so as not to be filled with synthetic resin. Also good.

  The shape of the part corresponding to the part installation part 44 of the lower mold 2 and the upper mold 3 is made to be the same shape as that of the part corresponding to the shape of the part 7, and the openings 82 and 83 of the suction pipes 25 and 35 are formed. It is preferable that the component 7 can be brought into close contact with the component setting portions 44 of the lower mold 2 and the upper mold 3 to ensure the positioning of the component and prevent the displacement.

  Further, the thickness of the component installation portion 44 is formed to be thicker than the thickness of the component 7. That is, the component installation portion 44 is formed with a thickness that allows the component 7 installed on the lower mold 2 to be separated from the upper mold 3 during mold clamping. This separation distance corresponds to the product error of the part and is a space for not damaging the part 7 at the time of clamping, and is not particularly limited as long as the molten resin does not enter, but usually 0.01 to 0.03 mm It should be about.

  When it is desired to form the synthetic resin formed on the upper surface 72 of the component 7 and the outer periphery of the component 7, as shown in FIGS. 3 (a) to 3 (c), the upper portion may be provided with or without the recess 31. The shape of the part corresponding to the part installation part 44 of the mold 3 is the same shape as the upper surface 72 of the part 7, and the transition part between the part corresponding to the part installation part 44 of the upper mold 3 and the part corresponding to the space part 42. Is formed flush with no step.

  The suction pipe 25 provided in the lower mold 2 penetrates the lower mold 2, opens one end to the concave portion 21, that is, the component installation portion 44 of the cavity portion 41, and the other end to the outer surface of the lower mold 2, that is, the bottom surface or the side surface. Opened and connected to a suction pump 52 installed outside the lower mold 2 via a connecting pipe 57 and a valve 58. The suction pipe 35 provided in the upper mold 3 passes through the upper mold 3, one end is opened in the recess 31, that is, the component installation portion 44 of the cavity portion 41, and the other end is opened in the outer surface of the upper mold 3, that is, the upper surface or side surface. The suction pump 53 installed outside the upper mold 3 is connected via a connection pipe 57 and a valve 59.

  The suction pipes 25 and 35 may be branched inside the lower mold 2 or the upper mold 3, respectively, so that a plurality of openings to the component installation section 44 of the cavity section 41 are provided. With such a configuration, even when the component 7 to be installed is relatively large and heavy, the component 7 can be reliably sucked.

  The suction pipes 25 and 35 may be connected to separate suction pumps 52 and 53, respectively, but the suction pumps 25 and 35 may be shared and connected to the suction pipes 25 and 35 via a switching valve. The suction pipes 25 and 35 may be configured by through holes provided in the lower mold 2 and the upper mold 3, respectively, or may be configured by inserting tubular members into the through holes.

  Next, the manufacturing method of the component integral molding synthetic resin product 10 using the said metal mold | die 1 is demonstrated with reference to FIG. In addition, the kind of synthetic resin used for this invention is not specifically limited. Further, the material of the part is not particularly limited, and a known material usually used for a part-integrated synthetic resin product, for example, metal, ceramics, glass, or the like can be used.

  First, as shown in FIG. 4A, the component 7 is installed at a predetermined position in the recess 21 of the lower mold 2, that is, at the component installation portion 44. At this time, it is preferable to place the component 7 using an installation jig because accurate positioning can be performed. After the component 7 is installed in the lower mold 2, the suction pump 52 is operated to suck the component 7 through the suction pipe 25 and fix it to the lower mold 2 to be positioned. If the jig is used, the jig is removed.

  In addition, it is preferable to perform an appropriate well-known surface treatment on the joint surface of the component 7 with the synthetic resin according to various combinations of the type of synthetic resin and the material of the component.

  Next, the upper mold 3 is lowered and the mold 1 is closed. At this time, as shown in FIG. 4B, the upper surface 72 of the component 7 is separated from the upper mold 3. After the mold clamping, the suction pump 52 is stopped, and the suction of the component 7 is stopped. Even if the suction is stopped in this state, the component 7 does not move left and right and up and down. Then, as shown in FIG. 4 (c), the suction pump 53 is operated to suck the component 7 through the suction pipe 35 and move it in the direction of the upper mold 3, and the upper surface 72 of the component 7 is moved to the upper mold 3. The parts 7 are fixed to the upper mold 3 by being brought into close contact with each other and positioned. At this time, the lower surface 73 of the component 7 and the lower mold 3 are separated from each other.

  It is preferable to operate the suction pump 53 at the same time as the operation of the suction pump 52 is stopped. Further, the suction pump 52 is operated after the suction pump 53 is operated to start sucking the component 7 and then stopped. That is, after the suction to the upper mold 3 is started, the suction to the lower mold 2 is stopped. It is good. In addition, operating or stopping the suction pump includes not only operating or stopping the suction pump itself but also operating or stopping the suction operation of the operating suction pump by opening and closing a valve.

  Next, as shown in FIG. 4D, the molten resin 6 is filled into the space 42 of the cavity 41. During this time, the suction pump 53 continues to operate and sucks the component 7, and is fixed to the upper mold 3 and positioned. Then, after the filling of the molten resin is completed and the molten resin is cured and fixed and integrated with the part, the operation of the suction pump 53 is stopped, and the upper mold 3 is moved upward as shown in FIG. The mold is opened by moving it, the protruding pin 27 of the lower mold 2 is moved upward, the molded product is pierced and released, and the synthetic resin portion 12 solidified on the outer periphery of the component 7 is formed. The resin product 10 is taken out.

  The component-integrated synthetic resin product 10 formed in this way is such that the component 7 is fixed at a predetermined position and corresponds to the component installation portion 44 as shown in FIGS. 3 (a) to 3 (c). When the mold 1 formed flush with the step portion and the transition portion corresponding to the space portion 42 without using a step is used, the synthetic resin portion formed on the outer periphery of the component 7 and the component 7 is used. No step is formed on the surface 12, the surface is formed flush, no gap is formed between the component 7 and the synthetic resin portion 12, and no burrs are formed on the component 7.

DESCRIPTION OF SYMBOLS 1 Mold 10 Part integral molding synthetic resin product 12 Synthetic resin part 2 Lower mold | type 25 Suction pipe 3 Upper mold | type 35 Suction pipe 41 Cavity part 42 Space part 44 Parts installation part 52 Suction pump 53 Suction pump 57 Connection pipe 58 Valve 59 Valve 6 Molten resin 7 Parts 82 Opening 83 Opening

Claims (4)

  The lower mold and the upper mold are each provided with a suction pipe penetrating the lower mold or the upper mold, and the suction pipes are respectively provided with a fixed lower mold and an upper mold movable up and down. One end is opened to the cavity part, the other end is connected to a suction pump, and when the mold is clamped, the thickness of the part installation part where the part of the cavity part is installed is thicker than the thickness of the part to be installed. Using a vertical molding machine equipped with, after installing the parts in the lower mold, the suction pump connected to the lower mold suction pipe is operated to suck the parts through the lower mold suction pipe and After fixing and positioning to the lower mold and clamping, the operation of the suction pump connected to the lower mold suction pipe is stopped to stop the suction of the parts to the lower mold and the suction of the upper mold Via the upper suction tube by operating the suction pump connected to the tube Fixed to the upper mold to suck the serial parts, after positioning, manufacturing method of parts molded synthetic resin product, which comprises filling the molten resin into the cavity portion.   2. The method of manufacturing a component-integrated synthetic resin product according to claim 1, wherein the suction of the component to the lower mold is stopped and the component is sucked to the upper mold simultaneously.   2. The method of manufacturing a component-integrated synthetic resin product according to claim 1, wherein the suction of the component to the lower die is stopped after the suction of the component to the upper die is started.   The shape of the part corresponding to the part installation part of the upper mold is the same shape as the upper surface of the part, and corresponds to the part corresponding to the part installation part of the upper mold and a space part filled with molten resin. The method of manufacturing a part-integrated synthetic resin product according to any one of claims 1 to 3, wherein the transition portion of the part to be formed is formed flush with no step.

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