JP2008221575A - Method and apparatus for producing surface-treated hollow molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a hollow molding with its inner surface treated, even when its size is relatively large, without being affected by temperature by injection molding, mold clamping force, thermal contraction, etc. <P>SOLUTION: With the use of a fixed mold (3) and a slide mold (4), a body part (H2) and a lid body (F1) are molded substantially at the same time by primary injection molding. The body part (H2) is taken out of the slide mold (4) by a handling apparatus (HM), set in a film forming apparatus (MM) installed separately, and form a film on the inner surface of the body part (H2). The formed film body part (HU1) is set in the slide mold (4) and butted with the lid body (F1) left in the fixed mold (3) to be integrated by secondarily injecting a molten resin to a butt part. The primary injection molding and the secondary injection molding are implemented substantially at the same time, and a film forming process is implemented in parallel with the injection molding. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a hollow molded article whose inner surface is partially surface-treated, and a manufacturing apparatus used for carrying out this manufacturing method. More specifically, the present invention relates to a fixed mold and a slide mold. A primary injection molding process for molding a pair of semi-molded products so as to have a joint, a surface treatment process for surface-treating the surface of one of the semi-molded products obtained in the primary injection molding process, and the surface treatment process Manufacturing method for obtaining a hollow molded product whose inner surface is surface-treated from a secondary injection molding process in which one half-molded product treated in step 1 is aligned with the other half-molded product and clamped and joined at a joint. And a manufacturing apparatus used for carrying out the manufacturing method.

  Examples of the hollow molded product having a thin film on the order of several μm on a part of the inner surface of the hollow body include a front lamp, a tail lamp and the like installed in a vehicle. Such a lamp includes a concave main body portion to which a light bulb is attached and a lens portion that is integrally attached to an opening of the main body portion. The main body is molded by, for example, injection molding, and unnecessary portions such as the outer surface are masked and suspended using a dedicated hanger in a vacuum tank dedicated for film formation, and then a thin film is formed by a film formation method as described later. Is formed. Then, the main body part on which the thin film is formed and the lens part separately molded are set in the respective molds, and the opening part of the main body part and the edge of the lens part are aligned and abutted, and the molten resin is bonded to the abutted joint part. Are molded and integrated to form a hollow molded product having a thin film on a part of the inner surface.

  A film forming method for forming a thin film on the inner surface of the main body or the surface of the substrate is well known in the art. For example, an argon gas atmosphere of about several Pa to several tens of Pa is formed with the substrate to be formed facing the target. Among them, a sputtering method in which a negative voltage of several kV is applied to a target and then discharged to form a thin film, a vacuum film forming method in which a substrate and an evaporation source are housed in a vacuum vessel, and a number on the substrate An ion plating method and the like in which a negative voltage of kV is applied and vacuum film formation is performed under an argon gas pressure of several Pa are known, and a chemical film formation method is also known.

Japanese Patent No. 3677033 Japanese Patent No. 3688289 JP 2004-338328 A

  Patent Document 1 discloses a method of forming a hollow molded product having a thin film on the inner surface by an injection molding process and a film forming process. That is, after performing a primary molding in which a pair of semi-hollow molded articles are molded so as to have a joint around the opening by a pair of cavities configured by a fixed mold and a slide mold, Open the mold so that the semi-hollow molded product remains on the slide mold and the other semi-hollow molded product remains on the fixed mold, and the semi-hollow molded product remaining on the slide mold is opened on the fixed mold. The slide mold is slid so as to be in close contact with the film-forming recess provided in the film, and a thin film is formed on the inner surface of the semi-hollow molded article by the film-forming chamber provided in the film-forming recess. Then, the slide mold is slid to a position where the joints of the pair of semi-hollow molded products are aligned, and then the mold is clamped. Molding method of hollow molded product with thin film It is shown. Patent Literature 2 and Patent Literature 3 also show a molding method of a hollow molded product having a thin film on the inner surface by a method similar to the molding method described in Patent Literature 1.

  The forming method described in Patent Document 1 does not require a step of removing the primary molded product from the mold and carrying it into the vacuum tank for film formation. Film formation defects due to contamination of the film formation surface caused by adhering to the molded product can be prevented. Furthermore, from the injection process of injection-molding a pair of semi-hollow molded products, through a film-forming process of forming a thin film, a pair of semi-hollow molded products are joined by secondary injection molding, and hollow molding having a thin film on the inner surface It is possible to automate each process until obtaining a product.

  However, the mold shown in Patent Document 1 has many problems because a film forming chamber for forming a film is provided in a fixed mold for performing primary injection molding. For example, since the mold for injection molding and the film formation chamber for film formation are provided in the same mold, the film formation chamber is affected by the temperature due to injection molding and generates distortion. The film forming chamber is also distorted by the influence of stress due to the clamping force for injection molding. As a result, there is a problem that it is difficult to ensure the hermeticity for obtaining a vacuum necessary for film formation. Thus, since it is difficult to ensure the degree of vacuum necessary for film formation, it is difficult to perform film formation on other molded products at the same time while performing injection molding. In addition, since the adjustment of the position of the mold for appropriately performing the injection molding and the adjustment of the position of the film forming chamber for appropriately performing the film formation are provided with the film forming chamber in the fixed mold, There is also a maintenance problem that the degree of freedom of adjustment cannot be performed independently. Furthermore, since the film forming chamber is incorporated in a fixed mold for injection molding, it is difficult to place the primary molding cavity at the center of the mold clamping force of the mold, and the mold clamping force that is used during injection molding The load applied to the injection molding machine is biased and affects the life of the injection molding machine. There is also a problem that the entire mold becomes large. As for the size of the mold, the size of the mold can be reduced by providing a two-stage parting surface and changing the mold clamping position during the primary molding and the mold clamping position during the film forming process. Although it can be suppressed somewhat, it is not preferable because another problem that mold clamping adjustment becomes difficult occurs. In addition, since the deposition chamber is built into the fixed mold for injection molding, it is necessary for the injection molding technology specialist and the deposition technology specialist to work together to produce the mold. Not only is it difficult to manufacture molds, it also increases costs.

  Furthermore, in the molding method disclosed in Patent Document 1, a series of steps from the primary molding of the semi-molded product formed on the inner surface to the deposition and the secondary molding are performed. Since it is held in the recess for the primary molding of the slide mold all the time, there is a particular problem when molding a relatively large hollow product. That is, since the resin material thermally shrinks at a shrinkage rate of 0.2 to 0.5% due to a temperature drop, when a series of processes including a film forming process takes a relatively long time and the cooling of the semi-molded product proceeds, If the semi-molded product is large, the amount of shrinkage becomes large, and the semi-molded product cannot be held in the mold. The above problems can also occur when the inner surface is coated with a semi-molded product covered with a cover in the mold, and when the inner surface is partially covered with a cover and polished or roughened. Arise.

  The present invention aims to provide a method for producing a hollow molded article whose inner surface is surface-treated and a production apparatus used for carrying out the method, which have solved the above-mentioned conventional drawbacks or problems. Specifically, the temperature and mold clamping required for performing appropriate injection molding and surface treatment without affecting the components of the surface treatment apparatus such as the film forming chamber due to the temperature and mold clamping force of the injection molding. Fine adjustments such as force can be performed independently, and even relatively large hollow molded products can be molded and surface-treated without being affected by thermal shrinkage, and the mold structure is simple and low-cost. An object of the present invention is to provide a method for manufacturing a hollow molded article whose inner surface is surface-treated, which can be manufactured and which has high production efficiency, and a manufacturing apparatus used for carrying out this manufacturing method.

In order to achieve the above object, the present invention provides a surface treatment apparatus for treating the inner surface of a hollow molded article, which is separated from an injection molding machine for injection molding and is disposed in the vicinity, and similarly, a semi-molded article in the vicinity. A handling device for handling the device is arranged. One of the two half-molded products that are injection-molded by primary molding is once taken out of the mold by the handling device, inserted into or attached to the surface treatment device, processed, and the surface-treated half-molded product. Is again inserted into the insert recess having a predetermined depth and size provided in one mold separately from the recess for primary molding by the handling device, and then half-molded inserted into the insert recess The slide mold is slid and clamped so that the product and another semi-molded product remaining on the other mold face each other, and then injected around the joint of the two semi-molded products. It is configured to be manufactured by molding.
According to another invention, the primary injection molding and the secondary injection molding are performed substantially simultaneously with the same mold, and the surface treatment is performed outside the mold in parallel with the first and second injection molding. Configured.

  That is, in order to achieve the above object, the invention according to claim 1 uses two primary molding cavities configured by clamping a slide mold to a fixed mold, A primary injection molding step of forming a pair of half-molded products having a split structure so as to have an abutting portion; and one of the pair of half-molded products is the fixed mold or the slide mold. Opening the mold while leaving it in one of the molds, taking out the other half-molded product from the mold with a handling device, and preparing it for mounting on a surface treatment apparatus provided outside the mold A surface treatment step of surface-treating the inner surface of the other semi-molded product by the surface treatment device, and the other hollow semi-molded product having an inner surface treated by the handling device. Take out from the above An insert step of inserting and attaching the abutting portion to the parting surface side in a recess for insert provided in a fixed die or the slide die, and the slide die with respect to the fixed die Slide the other half-molded product inserted into the insert recess and the one half-molded product remaining in the fixed mold or slide mold to face the slide mold. A secondary injection molding process in which the mold is clamped to a fixed mold, the pair of semi-molded products are brought into contact with each other at the abutting portion, and a molten resin is injected around the abutting portion and joined. Is done. According to a second aspect of the present invention, in the manufacturing method according to the first aspect, the primary injection molding step and the secondary injection molding step are performed substantially simultaneously with the same mold, and the surface treatment step is performed. Is performed outside the mold in parallel with the first and second injection molding steps, and the invention according to claim 3 is the manufacturing method according to claim 1 or 2, wherein the surface treatment step is performed. A thin film is formed on the inner surface of the other molded product by a film forming apparatus.

  Invention of Claim 4 is an injection molding machine used for implementation of the manufacturing method of any one of Claims 1-3, Comprising: This injection molding machine is a fixed metal mold | die, and this fixed It consists of a slide mold that is slid to at least two molding positions with respect to the mold and is clamped at each molding position, and the parting surface side of the fixed mold is hollow. At least one first concave portion for molding one half-molded product having a shape divided by two, and at least two second concave portions for molding the other half-molded product; At least one first core corresponding to the first recess and at least one second core corresponding to the second recess are provided on the parting surface side of the slide mold, Furthermore, on the parting surface of the slide mold, At least one insert recess having a predetermined depth and size, into which the first molded product whose inner surface is treated outside the mold is inserted and supported, is provided, and the fixed mold and the slide mold are provided. In any one of the two or more molding positions, at least one cavity for molding the first semi-molded product by the first recess and the first core, regardless of the molding position. At least one cavity for forming the second semi-molded product by the recess and the second core, and at least an insert cavity formed by facing the insert recess and the second recess. Each one is configured.

  Invention of Claim 5 is an injection molding machine used for implementation of the manufacturing method of any one of Claims 1-3, Comprising: This injection molding machine is a fixed metal mold | die, and this fixed It consists of a slide mold that is slid to the first and second molding positions with respect to the mold and is clamped at each molding position, and on the parting surface side of the fixed mold, The first and second recesses for one half-molded product for molding one half-molded product divided into two hollow molded products, and the other molding for molding the other half-molded product The first and second recesses for the product are provided, and the parting surface side of the slide mold is for one half-molded product corresponding to the first and second recesses for one half-molded product. A first core, first and second cores for the other molded product corresponding to the first and second recesses for the other semi-molded product, and others First of a predetermined depth and size in which the first molded product whose inner surface is treated outside the mold and corresponding to the first and second recesses for the semi-molded product is inserted and supported. It is comprised so that two recessed parts for inserts may be provided. The invention according to claim 6 is the manufacturing apparatus according to claim 4 or 5, wherein the manufacturing apparatus is an injection molding machine and a surface treatment apparatus provided separately from the injection molding machine, as well as the above. A handling device that is provided separately from an injection molding machine and delivers a semi-molded article between the injection molding machine and a surface treatment device, the devices being configured to be controlled in relation to each other, 7. The manufacturing apparatus according to claim 4, wherein the surface treatment apparatus is a film forming apparatus, and the film forming apparatus is provided with a film forming element. In addition, in the case of a bowl-shaped saucer on which a semi-molded product to be deposited is mounted, when the deposition chamber and the opening of the saucer are brought into contact with each other, an airtight deposition space is formed therein. Both of the required parts of the film formation chamber Configured as a masking plate of a predetermined shape is provided on.

  As described above, according to the present invention, since the surface treatment apparatus or the film forming apparatus is provided separately from the fixed mold and the slide mold, various effects can be obtained. That is, in the invention according to claim 3 or 7, for example, in the invention according to claim 3 or 7, the film forming chamber is not affected by the temperature of the mold due to the injection molding, and is distorted by the stress due to the clamping force. Without fear, it is possible to secure a sealing property for obtaining a vacuum. Therefore, the surface treatment process can be performed in parallel with the injection molding. In addition, since it is not necessary to provide a component of the surface treatment apparatus inside the mold, the entire mold can be made small, and the cavity for primary injection molding can be formed at a substantially central portion of the mold clamping force. Can be arranged. Accordingly, it is possible to reduce the load unevenness applied to the injection molding machine during mold clamping, and to extend the life of the injection molding machine. In addition, injection molding specialists and surface treatment or film deposition specialists can independently design and manufacture injection molds and film deposition equipment, thus keeping production costs low. It becomes possible. Furthermore, since the mold clamping adjustment for injection molding and the adjustment of the surface treatment apparatus can be performed independently, the degree of freedom in maintenance becomes high and cleaning becomes easy.

  Further, the fixed mold or the slide mold has a predetermined depth and size in which a semi-molded product surface-treated during the secondary injection molding is inserted and supported separately from the concave portion for the primary injection molding. Because the insert recesses are provided, if the insert recesses are designed with dimensions that take into account the shrinkage due to thermal shrinkage of the primary injection-molded semi-molded product, the hollow molded product has a large size and a large overall shrinkage. However, the effect that it can manufacture easily, without being influenced by shrinkage | contraction is also acquired.

  Also, the primary injection molding process and the secondary injection molding process are performed substantially simultaneously with the same mold, and the surface treatment process is performed outside the mold in parallel with the first and second injection molding processes. According to the above, the surface-treated semi-molded product to be inserted in the insert process is not the semi-molded product taken out in the treatment preparation process immediately before, but the semi-molded product taken out in the process preparation process in a series of previous processes. Since it is a semi-molded product that has been surface-treated with respect to the molded product, the process can be shifted directly from the treatment preparation step to the insert step without waiting for the surface treatment step. Therefore, the molding and the surface treatment can be performed efficiently, and the manufacturing efficiency of the hollow molded product is increased. Further, if the required time required for the surface treatment process and the required time required for other processes are known, it is possible to obtain an effect that the optimum number of apparatuses that can efficiently perform molding and surface treatment can be determined. For example, when it is found that the time required for the surface treatment process is N times as long as the time required for all processes other than the surface treatment process, if N surface treatment apparatuses are provided for one injection molding machine, Both the injection molding machine and the film forming apparatus can be operated continuously and efficiently.

  Hereinafter, in order to facilitate understanding of the embodiment of the present invention, a bowl-shaped main body H having a thin film such as a reflection film on the inner surface, and a thin lens-like shape that seals the opening of the main body H The lid F is molded by primary injection molding, and a thin film is formed on the inner surface of the main body H with a film forming apparatus, and then the secondary injection molding in which the opening of the main body H is sealed with the lid F. The example which manufactures the hollow molded product which has a thin film on the inner surface of the main-body part H is demonstrated.

  A manufacturing apparatus according to an embodiment of the present invention relates to an injection molding machine SM, a film forming apparatus MM disposed in the vicinity of the injection molding machine SM, and the injection molding machine SM and the film forming apparatus MM. The handling device HM is arranged. The injection molding machine SM is shown in FIG. 1, the film forming apparatus MM is shown separately in FIG. 3, and the handling apparatus HM is shown separately in FIG. It is configured to work.

  The injection molding machine SM according to the present embodiment has a general or basic structure that is conventionally known. That is, as shown in FIG. 1, a fixed platen 1, a movable platen 2 that is opened and closed with respect to this fixed platen, a fixed mold 3 that is attached to the fixed platen 1, and a vertical slide on the movable platen 2 It consists of a slide mold 4 that can be attached, and first and second injection units 6 and 7 that are provided so as to cross the fixed platen 1. The drive device for sliding the slide mold 4 in the vertical direction in FIG. 1 is composed of a conventionally known piston cylinder unit 9 in this embodiment. More specifically, a bracket 8 is attached to the upper portion of the movable platen 2, and a piston / cylinder unit 9 is provided on an arm extending horizontally from the upper end of the bracket 8 toward the parting surface P ′. . The rod 10 of the piston cylinder unit 9 extends downward and is attached to the top of the slide mold 4. Accordingly, when the working fluid is supplied to and discharged from the piston cylinder unit 9, the slide mold 4 is slidably driven in the vertical direction with respect to the movable plate 2, in other words, with respect to the fixed mold 3, and the first and second moldings are performed. Can slide to position. The two first and second molding positions are positions shifted by the interval because the cores or recesses provided in the stationary mold 3 and the slide mold 4 are arranged at the same interval as will be described later. It becomes.

  A hole 1a is formed in the fixed platen 1 at a substantially central portion so as to cross the fixed platen 1, and nozzles of the first and second injection units 6 and 7 are inserted from the back side of the fixed platen 1 through the hole 1a. ing. These nozzles are in contact with sprue holes provided in the fixed mold 3. The first and second injection units 6 and 7 are configured as conventionally known, and when the screw is driven to rotate, the resin material is melted and kneaded in the cylinder and accumulated in the measuring chamber, and when the screw is driven in the axial direction. The accumulated molten resin is injected and filled into cavities formed in a mold, which will be described later, through respective nozzles and sprues.

  FIG. 2 is an enlarged cross-sectional view showing details of the parting surfaces P and P ′ of the fixed mold 3 and the slide mold 4 when the slide mold 4 is opened. As shown in FIG. On the parting surface P side of the mold 3, two first and second concave portions 3a and 3a ′ having the same shape are provided at the center portion, and the same shape is formed on both sides of the upper and lower sides. Two first and second recesses 3b and 3b ′ for forming a lid are provided. The first and second recesses 3a and 3a ′ for forming the main body are substantially the same in width or diameter as the third and fourth recesses 3b and 3b ′ for forming the lid, but the depth is a predetermined amount. Just getting deeper. And these four recessed parts 3b, 3a, 3a ', 3b are arrange | positioned at equal intervals. The main body H is formed by the first and second recesses 3a and 3a ′ for forming the main body, and the cover body F is alternately formed by the first and second recesses 3b and 3b ′ for forming the cover. . As will be described in detail in the section of operation, the fixed mold 3 configured in this way is provided with a sprue, a runner, etc., and the recesses 3b, 3a, 3a ′, 3b described above are provided through the respective gates. Or it opens to the parting surface P.

  As shown in FIG. 2, in the substantially central portion on the parting surface P ′ side of the slide mold 4, corresponding to the first and second concave portions 3 a and 3 a ′ for forming the main body portion, A main body forming core 4a smaller than the concave portions 3a and 3a ′ by a predetermined amount is provided. An annular small core 4t is provided around the core 4a at a predetermined interval. The small core 4t forms a bonding space in the opening of the main body H. Two lid formations smaller than the first and second recesses 3b and 3b ′ for forming the lid of the fixed mold 3 are provided on both upper and lower sides of the small core 4t thus configured. First and second cores 4b and 4b 'are provided, and two first and second insert recesses 4c and 4c' into which the cooled and contracted main body H is inserted or attached are located on both sides thereof. Is provided. The recess 4c, the core 4b, the core 4a, the core 4b ', and the recess 4c' are arranged at equal intervals. These intervals are equal to the intervals between the aforementioned recesses 3 b, 3 a, 3 a ′ 3 b ′ disposed in the fixed mold 3.

  A film forming apparatus or a film forming method is conventionally known. For example, a surface to be formed is opposed to a target, and a negative voltage of several kV is applied to the target in an argon gas atmosphere of about several Pa to several tens Pa. Then, a sputtering method in which a thin film is formed by discharging, a vacuum film formation method in which the surface to be deposited in a vacuum vessel and an evaporation source are housed, and a negative voltage of several kV is applied to the surface, An ion plating method for performing vacuum film formation under the pressure of Pa argon gas is known, and a chemical film formation method is also known. In the present invention, various conventional well-known methods can be applied. FIG. 3 schematically shows a film forming apparatus MM used for carrying out the sputtering method.

  The film forming apparatus MM includes a bowl-shaped receiving tray 22 to which a primary molded body H is mounted and supported, and a film-forming chamber 21 provided to face the bowl-shaped receiving tray 22. It is configured. A film forming element is provided in the film forming chamber 21. The bowl-shaped tray 22 is fixed to the support base 20, and the film formation chamber 21 is driven in the vertical direction so that the piston-cylinder unit 23 contacts and separates from the bowl-shaped tray 22. The piston cylinder unit 23 includes a cylinder 23 ′ and a piston 24 as is well known in the art, and the cylinder 23 ′ is attached to a bracket 25 fixed to the support base 20. A masking plate 21a is attached around the opening of the film forming chamber 21 thus configured. With this masking plate 21a, the opening end of the main body H is masked, and only necessary portions are formed. The substrate electrode, which is a film forming element, is provided near the opening of the film forming chamber 21, and the target 26 and the electrode for heating it are provided in the back, and a power supply line is attached to each electrode. . Further, a gas introduction pipe 29 ′ for introducing an inert gas such as argon gas is opened in the film forming chamber 21, and a vacuum suction pipe 28 ′ is also opened. A power supply line 27 ′, a vacuum suction pipe 28 ′, a gas introduction pipe 29 ′, and the like connected to these electrodes are a power source device 27 that supplies direct current or high frequency power, a vacuum source 28 that includes an exhaust pump required for film formation, Each is connected to an inert gas supply source 29 for producing an inert gas such as an inert gas tank or carbon dioxide gas.

  The film forming apparatus MM operates as follows. In other words, the primary molded main body H is inserted or attached to the bowl-shaped receiving tray 22 with its inner surface facing up. Then, the piston cylinder unit 23 is driven to bring the film forming chamber 21 into close contact with the bowl-shaped receiving tray 22. Then, the inside of the film forming chamber 21 is sealed or airtight. At this time, the masking plate 21a comes into contact with the opening or the abutting portion of the main body H inserted in the bowl-shaped tray 22 and is sealed by the masking plate 21a. Thereby, a thin film is not formed in the abutting part in the film forming process performed thereafter. Next, the vacuum source 28 and the inert gas supply source 29 are driven to make the inside of the film forming chamber 21 an argon gas atmosphere of about several Pa to several tens Pa. The target 26 is discharged by supplying a negative voltage, and the heating electrode is supplied with direct current or high frequency power from the power supply device 27. Then, a thin film is formed on the inner surface of the main body H as is conventionally known.

  Although various types of systems can be applied to the handling device HM, FIG. 4 schematically shows the handling device HM provided with a gripper 45 that grips the main body H at the tip of the arm. The handling device HM includes a robot main body 42 provided on a support base 41, a first arm 43 protruding from the main body 42, and a first arm 43 attached to the first arm 43 via a universal joint 47. The second arm 44 and the gripper 45 that grips the main body H attached to the distal end of the second arm 44 via a similar joint 46. Since the gripper 45 is attached to the robot main body 42 via the first and second arms 43 and 44, it can be expanded, contracted, rotated and turned. Such a handling apparatus HM is disposed in the vicinity of these apparatuses in association with the injection molding machine SM and the film forming apparatus MM as described above.

  Next, a thin film is formed on the inner surface using the manufacturing apparatus according to the embodiment of the present invention, which is composed of an injection molding machine SM, and a film forming apparatus MM and a handling apparatus HM arranged in the vicinity thereof. A method for forming a hollow molded article will be described with reference to FIGS. 5 to 8 are diagrams schematically showing molding and film forming processes. In the molding process and the film forming process, the fixed mold 3 and the slide mold 4 are opened and closed, and one of the film forming apparatuses is shown. The operation state etc. of the bowl-shaped saucer 22 which is a part, and the film-forming chamber 21 are represented. According to the present embodiment, when the manufacturing cycle is established, the first and second injection moldings are performed substantially simultaneously, and the film forming process is performed in parallel therewith. When only the main body H1 is subjected to primary injection molding and deposited on the inner surface of the first main body H1, the second main body H2 and the first lid F1 are substantially simultaneously 1 An example of the next injection molding will be described.

  First, as shown in FIG. 5A, the slide mold 4 is driven to the upper first molding position to clamp the fixed mold 3. Then, the first recess 3a for molding the main body of the fixed mold 3 and the core 4a and the small core 4t for molding the main body of the slide mold 4 constitute a cavity Ch for molding the main body. In addition, the second injection unit 7 communicates with the cavity Ch for forming the main body.

  Molten resin is injected from the second injection unit 7. Thereby, the 1st main-body part H1 is shape | molded. FIG. 5A shows a state where such primary molding has been completed. Waiting for cooling and solidification, the slide mold 4 is opened by a predetermined amount. This open state is shown in FIG. At this time, in the film forming apparatus MM, the piston cylinder unit 23 is driven so that the film forming chamber 21 is separated from the bowl-shaped receiving tray 22 and is opened as shown in FIG. In this state, the first main body H1 is taken out from the first concave portion 3a for forming the main body of the fixed mold 3 by the handling device HM and inserted into the bowl-shaped tray 22 of the film forming apparatus MM. Installing. The state in which the first main body H1 is inserted into the bowl-shaped tray 22 is shown in FIG. On the other hand, as shown in FIG. 5D, the slide mold 4 is slid to the second molding position below in the opened state.

  The slide mold 4 is fastened to the fixed mold 3 at the second molding position. A state where the mold is clamped is shown in FIG. When the mold is clamped, the second recess 3a ′ for molding the main body of the fixed mold 3 and the core 4a and the small core 4t for molding the main body of the slide mold 4 constitute a cavity Ch ′ for molding the main body. The At the same time, the second concave portion 3b ′ for molding the lid of the fixed mold 3 and the second core 4b ′ for molding the lid of the slide mold 4 constitute a cavity Cf ′ for molding the lid. . Further, the second injection unit 7 communicates with the main body molding cavity Ch ', and the first injection unit 6 communicates with the lid molding cavity Cf'.

  In the film forming apparatus MM, the film forming chamber 21 is driven downward by the piston cylinder unit 23 to be brought into close contact with the bowl-shaped receiving tray 22. Thereby, a sealed space is formed between the first main body H1 and the film forming chamber 21. This state is shown in FIG. And the thin film U1 is formed in the inner surface of the 1st main-body part H1 with the sputtering method mentioned above. The state where the thin film U1 is formed is shown in FIG.

  When the film is formed on the inner surface of the first main body H1 by the film forming apparatus MM, the injection molding machine SM performs the primary injection from the second injection unit 7 into the cavity Ch ′ in parallel. The main body H2 is formed. At substantially the same time, a transparent resin is primarily injected from the first injection unit 6 into the cavity Cf 'to form the first lid F1. FIG. 6A shows a state in which the second main body H2 and the first lid F1 are formed at the same time in this manner. Waiting for cooling and solidification, the slide mold 4 is opened as shown in FIG. At this time, the second main body H2 and the first lid F1 are respectively formed in the second concave portion 3a ′ for molding the main body portion of the fixed mold 3 and the second concave portion 3b ′ for molding the lid. Open and leave. In parallel, in the film forming apparatus MM, the film forming chamber 21 is opened, and the first main body HU1 formed by the handling apparatus HM is taken out. FIG. 6C shows a state immediately before the film-formed first main body HU1 is taken out, and FIG. 6D shows a state after the take-out. The formed first main body HU1 is inserted or mounted in the second insert recess 4c 'provided in the slide mold 4 by the handling device HM. This state is shown in FIG.

  The slide mold 4 is slid to the upper first molding position. Then, the first main body HU1 inserted into the second insert recess 4c ′ is left in the second recess 3b ′ for forming the lid of the fixed mold 3. Opposite to F1. This facing state is shown in FIG. At this time, in the film forming apparatus MM, as shown in FIG. 7A, the second main body H2 taken out from the fixed mold 3 by the handling apparatus HM is inserted into the bowl-shaped receiving tray 22. Next, as shown in FIG. 7A, the slide mold 4 is clamped at the first molding position. Then, the formed first main body HU1 and the first lid F1 are abutted at the abutting portion. In parallel with the film forming apparatus MM, as shown in FIG. 7B, the film forming chamber 21 is in close contact with the bowl-shaped receiving tray 22 and between the second main body H <b> 2 and the film forming chamber 21. Thus, a sealed space is formed, and the film can be formed.

  Next, the molten resin is secondarily injected from the second injection unit 7. Although not shown in detail in the drawing, the molten resin is filled in a bonding space S1 formed by butting. Thereby, the formed first main body HU1 and the first lid F1 are joined at the abutting portion, and a hollow molded product HUF1 having a thin film on the inner surface is obtained. At the same time, the molten resin injected from the second injection unit 7 is filled in the cavity Ch. By this primary injection molding, the third main body H3 is molded. Further, for example, a transparent molten resin is injected from the first injection unit 6 into the cavity Cf. Thereby, the 2nd cover body F2 is shape | molded substantially simultaneously. This state is shown in FIG. On the other hand, in the film forming apparatus MM, as shown in FIG. 7C, the thin film U2 is formed on the inner surface of the second main body H2 as described above. That is, the primary molding and secondary molding by the first and second injection units 6 and 7 and the film forming operation by the film forming apparatus MM are performed substantially simultaneously.

  Next, the slide mold 4 is opened in a state where the second lid F2 and the third main body H3 remain on the stationary mold 3. In connection with this mold opening operation, an ejector pin (not shown) protrudes, and as shown in FIG. 7D, a first hollow molded product HUF1 having a thin film on the inner surface is taken out. In the film forming apparatus MM, as shown in FIG. 7D, the film forming chamber 21 is opened, and the second main body HU2 on which the film has been formed is taken out. The film forming apparatus after being taken out is shown in FIG.

  The film-formed second main body HU2 is taken out of the film-forming apparatus MM and inserted into the first insert recess 4c provided in the slide mold 4. Then, the slide mold 4 is slid to the second molding position below so that the formed second main body HU2 and the second lid F2 face each other. The slide state is shown in FIG. Next, the third body portion H3 subjected to the primary molding is taken out from the fixed mold 3 and inserted into the bowl-shaped receiving tray 22 of the film forming apparatus MM. The state in which the third main body H3 is taken out and the first concave portion 3a for molding the main body of the fixed mold 3 is emptied is shown in FIG. 8A, and the third main body H3 is the film forming apparatus. FIG. 8B shows a state where the MM bowl-shaped receiving tray 22 is mounted.

  In the injection molding machine SM, the slide mold 4 is clamped in the state shown in FIG. Then, the second film-formed main body HU2 attached to the slide mold 4 and the second lid F2 are brought into contact with each other. At the same time, the second recess 3a 'for molding the main body of the fixed mold 3 and the core 4a for molding the main body of the slide mold 4 constitute a fourth body molding cavity Ch'. Further, the second cavity 3 C ′ for forming the lid is formed by the second recess 3 b ′ for molding the lid of the fixed mold 3 and the second core 4 b ′ for molding the lid of the slide mold 4. Composed.

  Molten resin is injected from the second injection unit 7. The molten resin is filled in a space S2 for joining the second film-formed main body HU2 and the second lid F2, and the main body HU2 and the lid F2 are integrated. At the same time, the cavity Ch 'is filled and the fourth main body H4 is formed. Further, for example, a transparent molten resin is also injected from the first injection unit 6. As a result, the cavity Cf ′ for molding the third lid is also filled, and the third lid F3 is molded. The state in which the main body HU2 and the lid F2 are joined and the fourth main body H4 and the third lid F3 are thus formed is shown in FIG. In the film forming apparatus MM, as shown in FIG. 8C, the inner surface of the third main body H3 is formed in parallel.

  After the fourth main body H4 and the third lid F3 are cooled and solidified, the slide mold 4 is opened while leaving the fourth main body H4 and the third lid F3 toward the fixed mold 3. When the slide mold 4 is opened, the ejector pins protrude and are integrated to take out the molded product HUF2. This state is shown in FIG. In the film forming apparatus MM, as shown in FIG. 8D, the film forming chamber 21 is opened to take out the third main body HU3 on which the film has been formed. And it mounts | wears with the recessed part 4c 'for 2nd inserts of the fixed metal mold | die 3. FIG. When mounted, the state shown in FIG. Hereinafter, (D) to (D) of FIG. 6 are repeated to primarily form the main body and the lid, and the main body and the lid are joined by secondary molding. At the same time, (d) of FIG. ) To (d) of FIG. 8 are repeated to form a film on the inner surface of the main body to produce a hollow molded article having a thin film on the inner surface of the main body.

  The present invention is not limited to the above embodiment and can be implemented in various forms. For example, a hollow molded product manufactured according to the present embodiment includes a bowl-shaped main body having a thin film such as a reflective film on the inner surface, and a thin lens-shaped lid that seals the opening of the main body. Obviously, the present invention is not limited to a front lamp, a tail lamp or the like. It is also clear that the main body and the lid can be molded from the same resin. Furthermore, the inner surface can be coated with a surface treatment apparatus such as an electrostatic coating apparatus, or can be polished with a polishing apparatus. In addition, for example, the main body portion is flat and the lid is bowl-shaped, and the same can be carried out. Further, the arrangement of the masking plate is not limited to the illustrated embodiment, and the necessary portions are masked to the surface. Obviously, it can be implemented as a process.

  Moreover, the metal mold | die of the manufacturing apparatus based on this invention can be implemented with another form. For example, in the above-described embodiment, the insert concave portion in which the film-formed main body portion is mounted is provided on the slide mold, but the same can be implemented even if provided on the fixed mold. When implemented in this way, the recess for forming the cavity for molding the lid is provided on the slide mold. Moreover, even if it is a metal mold | die provided with only one recessed part for inserts, it can implement. FIG. 9A shows an example of such a mold. The present embodiment also includes a fixed mold 52 and a slide mold 51. In the embodiment described above, the slide mold 4 is attached to the movable platen 2 so as to slide linearly in the vertical direction. On the other hand, according to the present embodiment, the slide mold 51 is attached to the movable plate so that the surface thereof is in contact with the movable plate and can rotate. Such a fixed mold 52 is provided with a concave portion 52a for forming the main body at substantially the center, and two concave portions 52b and 52b ′ having the same shape for forming the lid are provided on both sides thereof. . The slide mold 51 is provided with a core 51a for forming a main body and a small core 51d around the core 51a, and a core 51b for forming a lid and a recess 51c for insert next to the slide mold 51. ing.

  Therefore, when the slide mold 51 is clamped with respect to the fixed mold 52 from the mold open state shown in FIG. 9A, as shown in FIG. A cavity tee is formed. That is, the cavity tee Cx for molding the main body portion by primary injection molding, the cavity tee Cy for similarly molding the lid, and the film-formed main body portion and the concave portion inserted into the recess 51c for insert. A cavity tee Cz for joining the lid remaining on 52b by secondary molding is configured. According to the present embodiment, the slide mold 51 is provided so as to be rotatable about the axis R perpendicular to the parting surface in the state where the mold is opened. When it is rotated 180 degrees to the center and clamped, three cavity tees are formed as shown in FIG. That is, a cavity tee Cx for molding the main body by primary injection molding, a cavity tee Cy 'for similarly molding the lid, and a cavity tee Cz' for secondary molding are configured. It is possible to manufacture a hollow product having a thin film on the inner surface of the main body as described above using the fixed mold 52, the slide mold 51, the film forming apparatus MM, and the handling apparatus HM. it is obvious.

It is a side view which shows the outline of the injection molding machine which concerns on embodiment of this invention in a partial cross section. It is a sectional side view which expands and shows the metal mold | die of the injection molding machine which concerns on embodiment of this invention. It is a front view which shows typically the film-forming apparatus which concerns on embodiment of this invention. 1 is a front view schematically showing a handling device according to an embodiment of the present invention. It is a figure which shows each step of the effect | action of the manufacturing apparatus which concerns on embodiment of this invention, The (a)-(d) is sectional drawing which shows each step of the effect | action of the metal mold | die of an injection molding machine, (a), (B) is sectional drawing which shows each step | level of an effect | action of the film-forming apparatus. It is a figure which shows each other step of the effect | action of the manufacturing apparatus which concerns on embodiment of this invention, The (a)-(d) is sectional drawing which shows each step of the effect | action of the metal mold | die of an injection molding machine, (a ) To (d) are cross-sectional views showing each stage of the action of the film forming apparatus. It is a figure which shows each other step of the effect | action of the manufacturing apparatus which concerns on embodiment of this invention, (a)-(D) is sectional drawing which shows each step of the effect | action of the metal mold | die of an injection molding machine, (a)-(d) is sectional drawing which shows each step | level of an effect | action of the film-forming apparatus. It is a figure which shows each other step of the effect | action of the manufacturing apparatus which concerns on embodiment of this invention, The (a)-(d) is sectional drawing which shows each step of the effect | action of the metal mold | die of an injection molding machine, (a ) To (d) are cross-sectional views showing each stage of the action of the film forming apparatus. It is a figure which shows the metal mold | die of the injection molding machine which concerns on other embodiment of this invention, (a) is the state which opened the slide metal mold | die, (i) is for primary molding by closing a slide metal mold | die. In the state in which the cavity for the secondary molding and the cavity for the secondary molding are formed, the slide mold is rotated 180 degrees to close the cavity for the primary molding and the cavity for the secondary molding. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Fixed metal mold 4 Movable metal mold 6 1st injection unit 7 2nd injection unit 3a 1st recessed part for main-body part shaping | molding 3a '2nd recessed part 3b for main-body-part shaping | molding 3b 1st for lid-body shaping | molding Concave part 3b ′ Second concave part for forming the lid body 4 Core for forming the main body 4c First concave part for insert 4c ′ Second concave part for insert 21 Film formation chamber
21a Masking plate 22 Receptacle SM Injection molding machine MM Deposition device HM Handling device

Claims (7)

Using a pair of primary molding cavities configured by clamping a slide mold to a fixed mold, a pair of half-molded products having a split structure is molded to have a butt portion. A primary injection molding process;
One of the pair of semi-molded products is left open in either the fixed mold or the slide mold, and the other half-molded product is opened by a handling device. A process preparation step for removing from the mold and mounting on a surface treatment apparatus provided outside the mold;
A surface treatment step of surface-treating the inner surface of the other semi-molded product by the surface treatment device;
The other hollow semi-molded product whose inner surface has been treated is taken out of the surface treatment device by the handling device, and is inserted into the insert recess provided in the fixed die or the slide die. Insert process to insert and install in a state facing the parting surface side,
The slide mold is slid with respect to the fixed mold, the other half-molded product inserted into the insert recess, and the one half mold remaining in the fixed mold or slide mold The slide mold is clamped with respect to the fixed mold, the pair of semi-molded products are brought into contact with each other at the abutting portion, and molten resin is injected around the abutting portion. And a secondary injection molding step for joining, and a method for producing a hollow molded article whose inner surface is surface-treated. 2. The manufacturing method according to claim 1, wherein the primary injection molding step and the secondary injection molding step are performed substantially simultaneously with the same mold, and the surface treatment step is the first and second injection molding steps. A method for producing a hollow molded article whose inner surface is surface-treated, which is performed outside the mold in parallel with the mold. The manufacturing method according to claim 1 or 2, wherein in the surface treatment step, a thin film is formed on the inner surface of the other molded product by a film forming apparatus, and the inner surface is surface-treated. It is an injection molding machine used for implementation of the manufacturing method according to any one of claims 1 to 3, wherein the injection molding machine includes at least two fixed molds and at least two fixed molds. It consists of a slide mold that is slid to the molding position and is clamped at each molding position.
On the parting surface side of the fixed mold, at least one first concave portion for molding one half-molded product having a shape obtained by dividing two hollow molded products, and the other half-molded product is molded. At least two second recesses for
At least one first core corresponding to the first recess and at least one second core corresponding to the second recess are provided on the parting surface side of the slide mold, Further, the parting surface of the slide mold has at least one insert recess having a predetermined depth and size into which the first molded product whose inner surface is treated outside the mold is inserted and supported. Provided,
The first semi-molded product is molded by the first recess and the first core, regardless of the molding position of the two or more molding positions of the fixed mold and the slide mold. At least one cavity for forming the second semi-molded product by the second recess and the second core, and the recess for insert and the second recess are opposed to each other. An apparatus for producing a hollow molded article having a surface-treated inner surface, wherein at least one insert cavity is formed. It is an injection molding machine used for implementation of the manufacturing method according to any one of claims 1 to 3, wherein the injection molding machine includes a fixed mold and a first, It consists of a slide mold that is slid to the molding position 2 and clamped at each molding position.
On the parting surface side of the fixed mold, the first and second concave portions for one half-molded product for molding one half-molded product having a shape obtained by dividing two hollow molded products, and the other The first and second recesses for the other molded product for molding the semi-molded product,
On the parting surface side of the slide mold, a first core for one half-molded product corresponding to the first and second recesses for one half-molded product and the one for the other half-molded product Surface treatment of the inner surface outside the mold corresponding to the first and second cores for the other molded product corresponding to the first and second recesses and the first and second recesses for the other semi-molded product A hollow molded article having a thin film on its inner surface, wherein first and second insert recesses having a predetermined depth and size into which the first molded article is inserted and supported are provided. Manufacturing equipment. 6. The manufacturing apparatus according to claim 4, wherein the manufacturing apparatus is provided separately from an injection molding machine, a surface treatment apparatus provided separately from the injection molding machine, and similarly from the injection molding machine. A handling device for delivering a semi-molded product between the injection molding machine and the surface treatment device, and these devices are controlled in relation to each other, and the inner surface of the molded product with the surface treated. Manufacturing equipment. 7. The manufacturing apparatus according to claim 4, wherein the surface treatment apparatus is a film forming apparatus, and the film forming apparatus includes a film forming chamber in which a film forming element is provided, and a film forming half. In the case of a bowl-shaped tray on which a molded product is mounted, when the film forming chamber and the opening of the tray are brought into contact with each other, an airtight film forming space is formed therein, and the film forming is performed. An apparatus for producing a hollow molded article having a thin film on the inner surface, wherein a masking plate having a predetermined shape is provided at a required portion of the chamber.

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