JP5336264B2 - Blow molding die and blow molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new blow mold which can separate burrs surely, and a blow molding method. <P>SOLUTION: The mold includes a resin filling space 3k which is positioned apart from forming positions of one and the other of cavity surfaces 3e, 4e, and is formed in the mold 3 or the mold 3 and the other mold 4, and filled with a part of a resin which forms burrs in mold clamping, a nipping and holding means 6 nipping and holding the resin which is a part of the burrs filled in the resin filling space 3k, and a holding means 7 arranged at the other mold 4 and holding a molding W molded by the cavity surfaces 3e, 4e of the mold 3 and the other mold 4. The molding W is held via the holding means 7 at the other mold 4 side, and the mold 3 and the other mold 4 are constituted so as to be mold-opened in a state that the resin which is a part of the burrs is nipped and held via the nipping and holding means 6 at the mold 3 side. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a blow molding die and a blow molding method used when blow molding a hollow molded product, and particularly used to automatically remove burrs generated in the hollow molded product during the blow molding process. The present invention relates to a blow molding die and a blow molding method.

  When blow-molding a hollow molded product, a molten resin is extruded to form a cylindrical parison, and the parison is sandwiched between one mold and the other mold (clamped), and the parison The parison is expanded by pressurizing compressed air inside, and is closely attached to a molding surface forming a space (cavity) closed by the one and the other molds. Then, after the resin is lowered to a predetermined temperature and hardened, the one mold and the other mold are separated (opened), and the hollow molded product is demolded. At this time, since burrs are generated on the outer periphery of the parting line of the hollow molded product that has been removed from the mold, conventionally, an operation for removing the burrs has been required by an operator.

  However, the work of removing the burr is complicated and a technique for automatically removing the burr has been proposed because of the necessity of shortening the manufacturing time (see Patent Document 1). This technique is provided with a pinch-off portion, a groove portion adjacent to the pinch-off portion in the form of an outer moat, and a burr pinching portion that holds and holds a burr on the mating surface of the other die. A burr protrusion member that advances and retreats while being guided in a plurality of guide holes is provided, and the burr protrusion member is driven in the direction of the groove to automatically remove the burr.

JP 2007-276125 A

  However, in the blow molding die disclosed in Patent Document 1, the parison is clamped between one die and the other die, and the burr that protrudes across the groove portion is pinched off and The burrs are held between the burrs and the contact surface of one mold, and after the held burrs are cooled and solidified, the burrs projecting members are advanced to the burrs. In other words, the burrs are punched out by the tip of the burr protruding member before the burrs are torn off, and the burrs may not be separated from the molded product.

  Therefore, the present invention has been proposed in order to solve the above-described problems of the conventional blow molding die, and forms burrs generated on the outer periphery of a parting line of a molded product formed by blow molding. It is an object of the present invention to provide a novel blow molding die and blow molding method that can be reliably separated from a product.

  The present invention has been proposed in order to solve the above-described problems. The first invention (the invention according to claim 1) relates to a blow mold, and one cavity surface is formed. A mold for blow molding comprising one mold and the other mold on which the other cavity surface is formed, the position being separated from the formation position of the one and the other cavity surface, Resin filling that is formed on the one mold or the one mold and the other mold and is filled with a part of the resin that becomes a burr when the one mold and the other mold are clamped A space, a holding means for holding a resin which is a part of a burr filled in the resin filling space, and a holding means which is arranged in the one mold or the other mold, and arranged in the other mold And a molded product formed by the cavity surfaces of the one and the other molds. Holding means for holding, and holding the molded product on the other mold side via the holding means, and part of the burr on the one mold side via the clamping means. It is characterized in that the one and the other molds are opened while the resin is sandwiched.

  In the first invention, when the one mold and the other mold are clamped with the parison interposed therebetween, the resin forming the parison is a combination of the one mold and the other mold. It is formed as a burr on the surface, and a part of the resin that becomes the burr is also filled in the resin filling space of the one mold (or the one mold and the other mold). After filling of the resin into the resin filling space is completed, a part of the burr that is the resin is placed in the resin filling space by the clamping means arranged in the one mold (or the other mold). It is pinched. On the other hand, when the mold clamping is finished and the molded product is molded by the cavity surfaces of the one and the other molds by injecting compressed air into the inside of the parison and expanding the parison, the other mold The molded product is held via the holding means arranged in the box. After such a state is completed in one mold and the other mold, when the one mold and the other mold are moved in a direction in which they are relatively separated (mould open), the other mold is moved. The molded product held by the holding means arranged in the mold and the burr partially held in the resin-filled space by the clamping means are separated from each other, whereby the entire burr formed on the outer periphery of the molded product is Removed from the molded article. Therefore, according to the blow molding die according to the first invention, not only can the burr be automatically removed in the molding process of the molded product, but also the combination of the one mold and the other mold can be performed. It is possible to reliably separate the burrs formed on the surface from the molded product. The holding means constituting the present invention may be any means as long as it is disposed on the other mold and holds the molded product formed by the cavity surfaces of the one and other molds. It may be directly gripped, or it may be a case by means described in claim 6.

  According to a second invention (invention of claim 2), in the first invention, the resin-filled space is a slide groove formed in the one mold and having a clamping surface at the end. The clamping means is disposed in the slide groove, and advances in the clamping surface direction while being guided by the slide groove to clamp a part of the burr in which the resin is cured in cooperation with the clamping surface, The movable mold includes a movable mold that moves backward in a direction away from the clamping surface after the one mold and the other mold are separated from each other.

  In the second aspect of the invention, the resin filling space is a slide groove formed in the one mold and having a holding surface at the end, and the holding means is disposed in the slide groove, and the slide It includes a movable mold that advances in the direction of the clamping surface while being guided by the groove and clamps a part of the burr in which the resin is cured in cooperation with the clamping surface. And the other mold are clamped, so that a part of the resin filled in the slide groove of the one mold moves the movable mold arranged in the one mold to the clamping surface side. And a part of burr which is the said resin is clamped by a movable mold | type and a clamping surface. Therefore, the burr formed on the mating surface of the one mold and the other mold can be more reliably separated from the molded product, and can be simply configured.

  According to a third invention (invention described in claim 3), in the second invention, the movable die is formed with a movable clamping surface that opposes the clamping surface, and the clamping surface and the movable side are formed. Concave or convex portions are formed on both or any one of the clamping surfaces.

  In the third aspect of the invention, since one or both of the clamping surface and the moving side clamping surface are formed with a concave or convex portion, one mold is separated from the other mold. When the mold is opened, a part of the burr sandwiched between the movable clamping surface and the clamping surface formed in the movable mold comes out from between the movable clamping surface and the clamping surface. Thus, it is possible to effectively prevent a situation in which the molded product is moved together with the molded product held by the holding means (the burr and the molded product are not separated).

  According to a fourth invention (invention according to claim 4), in any one of the second and third inventions, a plurality of movable molds and slide grooves are arranged or formed with respect to the one mold. It is characterized by being made.

  In the fourth invention, a plurality of the movable molds and the slide grooves are arranged or formed with respect to the one mold, so that burrs can be more reliably removed from the molded product. In the fourth aspect of the invention, in addition to the movable mold and the slide groove that constitute the invention of claim 5, the movable mold and the movable mold are respectively provided above and below the cavity surface formed on the one mold. The slide groove may be arranged or formed, and may be provided at one position, for example, on the left or right side above the cavity surface, or on the right or left side below the cavity surface. It may be one place or formed. Furthermore, depending on the shape of the molded product, movable molds and slide grooves are arranged or formed on both the left and right sides above the cavity surface, and a single movable mold and slide groove are arranged or formed at the center below the cavity surface. It may be.

  According to a fifth invention (invention according to claim 5), in any one of the second, third, and fourth inventions, the movable mold and the slide groove are formed in the cavity with respect to the one mold. It is arranged or formed on both the left and right sides above the surface, and is arranged or formed on both the left and right sides below the cavity surface.

  In the fifth aspect of the present invention, the movable mold and the slide groove are arranged or formed on the left and right sides above the cavity surface with respect to the one mold, and are arranged on the left and right sides below the cavity surface. Since it is formed, even if the shape of the molded product is complicated, it is possible to reliably remove burrs from the molded product.

  According to a sixth invention (invention of claim 6), in the first, second, third, fourth or fifth invention, the cavity surface of the other mold is the cavity. A portion for molding a portion to be removed after the molded product is removed by cutting after being molded by the surface, and the holding means for holding the molded product includes the portion to be removed of the other mold. A protrusion that can protrude and immerse inside the cavity surface of the part to be molded, and has a length in a direction orthogonal to the approach / separation direction of the one mold and the other mold And a driving means for projecting and immersing the projecting portion inside the cavity surface of the other mold.

  According to the sixth aspect of the present invention, the mold can be protruded / immersed inside the cavity surface of the part to be removed of the other mold, and the one mold and the other mold can be approached / separated from each other. The molded product is held by a protruding portion having a length in a direction orthogonal to the direction, and the operation of the protruding portion is to clamp the one and the other molds in a state of protruding in advance. The first method in the case and the second and third methods in the case of protruding after the mold is clamped are included. First, the operation of the first method will be described. The protrusion is protruded in advance to the inside of the cavity surface of the other mold, and then the one and other molds are clamped and then sealed. In this method, compressed air is pressed into the inside of the parison. By such an operation, a concave portion formed by a part of the parison is formed around the protruding portion. Therefore, when opening the one mold and the other mold, the molded product is positioned at the position without being removed from the other mold by the protruding portion protruding in the recess of the portion to be removed. As a result, only the burrs filled in the resin filling space are removed from the molded product while being held by the holding means. Then, after such a burr removing process (mold opening process between one mold and the other mold) is completed, the projecting portion is immersed from the inside of the cavity surface of the other mold by driving the driving means. The molded product including the portion to be removed is removed from the other mold. Next, the operation of the second method will be described. The one and the other molds are clamped, and then the compressed air is press-fitted inside the sealed parison to form the one and the other cavity surfaces. In this method, after the product is molded, the projecting portion is projected to enter the parison. Further, the operation of the third method will be described. The one and the other molds are clamped, and then the projecting portion is made to enter the inside of the sealed parison, and then the compressed air is introduced into the inside of the parison. This is a method of molding a molded product with one and the other cavity surface by press-fitting. In these second and third methods, the protruding portion is stabbed into the cut planned portion by the protrusion of the protruding portion described above. Thereafter, when the one and the other molds are separated from each other (opened), the molded product is held on the other mold side by the projecting portion and the one mold (with the burr sandwiched therebetween) is used. Therefore, only the burrs are removed. In addition, after such a burr removal process (mold opening process between one mold and the other mold) is completed, when the projecting portion is immersed from the inside of the cavity surface of the other mold by driving the driving means. The molded product including the portion to be removed is removed from the other mold. Therefore, according to the mold for blow molding according to the sixth aspect of the invention, the molded product can be reliably held when the one mold and the other mold are opened, and the molded product The burr can be removed automatically and reliably.

  A seventh invention (invention according to claim 7) relates to a blow molding method, wherein any one of the blow molding dies according to claims 1, 2, 3, 4, 5, or 6 is used. The step of disposing a melted parison between one mold and the other mold separated from each other, the one mold and the other mold are clamped, and the one mold or the one mold Filling the resin filling space or slide groove formed in the mold and the other mold with a part of the resin serving as a burr, and pressing the compressed air into the inside of the parison to form a molded product, and A step of clamping by a clamping means arranged in a resin filling space or a slide groove, or a movable die is moved to the clamping surface side, and a part of a burr filled in the slide groove is moved to the movable die and the clamping surface. And the holding means disposed in the other mold. A step of holding the molded article and is characterized by comprising and a step of opening type is separated one mold and the other mold above.

  In the seventh aspect of the invention, when the one mold and the other mold are clamped with the parison interposed therebetween, the resin forming the parison is combined with the one mold and the other mold. It is formed as a burr on the surface, and a part of the burr is also filled in the resin filling space or the slide groove of the one mold or the one mold and the other mold (in the resin filling space or the slide groove). The resin filled in is also part of the burr). After the resin filling into the resin filling space or the slide groove is finished, the holding means arranged in the one mold is operated, or the moving mold is moved to the holding surface side, the resin is obtained. A part of the burr is pinched by the pinching means or the moving type. On the other hand, when the mold clamping is finished and the molded product is molded by the cavity surfaces of the one and the other molds by injecting compressed air into the inside of the parison and expanding the parison, the other mold The molded product is held via the holding means arranged in the box. After such a state is completed in one mold and the other mold, when the one mold and the other mold are moved in a relatively separated direction, they are arranged in the other mold. The molded product held by the holding means and the burr partially held by the holding means or the movable mold are separated from each other, whereby the entire burr formed on the outer periphery of the molded product is removed from the molded product. Therefore, according to the blow molding method of the seventh invention, burrs can be removed automatically and reliably in the molding process of the molded product. The holding means constituting the present invention may be any means as long as it is disposed on the other mold and holds the molded product formed by the cavity surfaces of the one and other molds. It may be directly gripped or it may be the case by means described in claim 6.

  In the first invention (the invention described in claim 1), not only can the burr be automatically removed in the molding process of the molded product, but also formed on the mating surface of the one mold and the other mold. Since it is possible to reliably separate the burrs from the molded product, there is no need to provide a process for removing the burrs remaining on the molded product after the molding process and eliminate the need to remove burrs from the molded product. Reduction and manufacturing cost can be reduced.

  In the second invention (the invention described in claim 2), it is possible to more reliably separate the burr formed on the mating surface between the one mold and the other mold from the molded product. Therefore, there is no need to remove burrs from the molded product after the molding process, and it is not necessary to remove burrs from the molded product, and it can be configured simply, reducing labor costs and manufacturing costs. Can be achieved.

  In the third invention (the invention according to claim 3), since the concave surface or the convex portion is formed on both or one of the clamping surface and the moving side clamping surface, the movable type is formed. A part of the burr sandwiched between the moving side holding surface and the holding surface is pulled out from between the moving side holding surface and the holding surface, and moves together with the molded product held by the holding means. Can be effectively prevented, and the burr formed on the mating surface of the one mold and the other mold can be reliably separated from the molded article. Is possible. Therefore, it is not necessary to provide a process for removing burrs remaining on the molded product after the molding process, and it is not necessary to remove burrs from the molded product, so that it is possible to reduce labor costs and manufacturing costs.

  In the fourth invention (the invention described in claim 4), a plurality of the movable molds and the slide grooves are arranged or formed with respect to the one mold, so that the burrs are more reliably prevented from the molded product. Can be removed. Therefore, it is not necessary to provide a process for removing burrs remaining on the molded product after the molding process, and it is not necessary to remove burrs from the molded product, so that it is possible to reduce labor costs and manufacturing costs.

  In the fifth invention (the invention according to claim 5), the movable mold and the slide groove are arranged or formed on the left and right sides above the cavity surface with respect to the one mold, and the cavity Since it is arranged or formed on both the left and right sides below the surface, it is possible to reliably remove burrs from the molded product even when the shape of the molded product is complicated. Therefore, it is not necessary to provide a process for removing burrs remaining on the molded product after the molding process, and it is not necessary to remove burrs from the molded product, so that it is possible to reduce labor costs and manufacturing costs.

  In the sixth invention (the invention described in claim 6), the holding means for holding the molded product is provided with the above-described protrusion, so that one mold and the other mold are opened. At this time, the molded product can be securely held, and burrs can be automatically and reliably removed from the molded product. Therefore, it is not necessary to provide a process for removing burrs remaining on the molded product after the molding process, and it is not necessary to remove burrs from the molded product, so that it is possible to reduce labor costs and manufacturing costs.

  In the seventh invention (the invention described in claim 7), not only can the burr be automatically removed in the molding process of the molded product, but also on the mating surface of the one mold and the other mold. Since it is possible to reliably separate the formed burrs from the molded product, there is no need to provide a process for removing burrs remaining on the molded product after the molding process, and there is no need to remove burrs from the molded product. Costs and manufacturing costs can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the state which inserted the parison in the metal mold | die of one and the other while showing the metal mold | die for blow molding which concerns on the 1st Embodiment of this invention, (a) is (b) A cross-sectional view, (b) is a longitudinal cross-sectional view of (a). It is a schematic diagram which shows the process of the blow molding which concerns on the 1st Embodiment of this invention, Comprising: (a) is the state which clamped one and the other metal mold | die, (b) is based on the movable mold | type of a burr | flash clamping part. Each state where a part of the burr is sandwiched is shown. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the process of the blow molding which concerns on the 1st Embodiment of this invention, Comprising: (a) is the state where the compressed air was press-fitted in a parison, and the molded article was shape | molded, (b) is one and The state where the other mold is opened is shown. It is a schematic diagram which shows the process of the blow molding which concerns on the 1st Embodiment of this invention, Comprising: (a) is the state which retracted the holding rod (protrusion part) of a molded article holding part, (b) is the other side. The state where the molded product is removed from the mold and the burr is removed from one mold is shown. It is a perspective view which shows the molded product with a burr | mold shape | molded by the metal mold | die for blow molding which concerns on the 1st Embodiment of this invention, and the blow molding method. (A) is a perspective view showing the molded product separated from the molded product with burr, and (b) is a perspective view showing the burr separated from the molded product with burr. It is a schematic diagram which shows the process of the blow molding which concerns on the 2nd Embodiment of this invention, Comprising: (a) is the state which clamped one and the other metal mold | die, (b) is by the clamping arm of a burr | flash clamping part. Each state where a part of the burr is sandwiched is shown. It is a schematic diagram which shows the process of the blow molding which concerns on the 2nd Embodiment of this invention, Comprising: (a) is the state which opened the mold of one and the other, (b) is the holding rod of a molded article holding | maintenance part. The state where the (projection) is retracted is shown. It is a schematic diagram which shows the process of the blow molding which concerns on the 3rd Embodiment of this invention, Comprising: (a) is the state which clamped one and the other metal mold | die, (b) is one and the other metal mold | die. Each of the molds opened is shown.

  Hereinafter, first to third embodiments for carrying out the blow molding die and blow molding method of the present invention will be described in detail with reference to the drawings.

  First, the blow molding die 1 according to the first embodiment includes one mold 3 and the other mold 4 for molding a molded product W by blow molding, and as shown in FIG. The mating surface 3a formed on the front surface of the mold 3 and the mating surface 4a formed on the front surface of the other mold 4 opposite to the mating surface 3a of the one mold 3 are moved so as to be in close contact with each other. It is supported by a sliding guide member (not shown) as possible. Of these, one mold 3 is formed with a recessed surface 3d that is recessed through an inclined surface 3c on the back surface 3b side of the mating surface 3a around the mating surface 3a. The space between 3b is formed in a substantially rectangular parallelepiped. A cavity surface 3e is formed inside the mating surface 3a. A cavity (space) in the cavity surface 3e and a cavity (space) in a cavity surface 4e formed in the other mold 4 described later. As a result, the outer shape of the vertically long molded product W having the octagonal cross section shown in FIG.

  Further, each of the molds 3 on the upper end surface 3g side and the lower end surface 3h side shown in FIG. 1 (b) has two locations on the left side surface 3i side and the right side surface 3j side shown in FIG. 1 (a). Slide grooves (resin-filling spaces constituting the present invention) 3k are respectively formed in a total of four locations, and these slide grooves 3k include a part of the recessed surface 3d and a part of the left side surface 3i and the right side surface 3j. Are respectively opened, and standing nipping surfaces (standing surfaces) 3m are formed at the ends (see FIG. 1A). In these slide grooves 3k, four sets of burr clamping parts (clamping means constituting the present invention) 6 that clamp a part of the bulging burr part Bc (see FIG. 2) of the thick burr part Bb described later are provided. Each is arranged. These burr clamping portions 6 are each provided with a movable die 11 on the tip side, and these movable dies 11 are respectively guided by the slide groove 3k and can be freely moved toward and away from the clamping surface 3m. In addition, the moving side holding surface 11a facing the holding surface 3m has a mountain shape that is hooked so that the bulging burr part Bc held by the moving side holding surface 11a and the holding surface 3m does not come out. Concavities and convexities (reference numerals are omitted) are respectively formed. These movable dies 11 are connected to rods 12a that can be moved forward and backward by the compressed air of the air cylinder 12, and the movable dies 11 move forward and backward in the slide groove 3k by the operation of the air cylinder 12. At the end position, the bulging burr portion Bc is pressed against the clamping surface 3m by the moving side clamping surface 11a of the movable die 11 (see FIG. 2B).

  Next, the other mold 4 is formed with a recessed surface 4d which is recessed through an inclined surface 4c on the back surface 4b side of the mating surface 4a around the mating surface 4a, and the recessed surface 4d and the back surface 4b. Is formed in a substantially rectangular parallelepiped. A cavity surface 4e is formed inside the mating surface 4a. A cavity (space) in the cavity surface 4e and a cavity (space) in the cavity surface 3e formed in the one mold 3 are provided. As a result, the outer shape of the vertically long molded product W having the octagonal cross section shown in FIG. As shown in FIG. 6 (a), the molded product W is composed of a molded product main body Wa and a planned removal portion Wb, and the planned removal portion Wb is a two-point difference in the process after blow molding. The cutting part Wc indicated by the line is cut and removed. This to-be-removed portion Wb is formed by the removed portion cavity 4f in the shaded portion shown in FIG. 1A among the cavities formed by the cavity surface 3e.

  Further, in the area of the removal portion cavity 4f of the other mold 4, there is a left side surface shown in FIG. 1 (a) on each of the upper end surface 4g side and the lower end surface 4h side shown in FIG. 1 (b). Four sets of molded product holding portions (holding means constituting the present invention) 7 are arranged in four places in total, two places on the 4i side and the right side surface 4j side. These molded product holding portions 7 are respectively formed with guide holes 4k for guiding holding rods (protruding portions constituting the present invention) 13 described later. A holding rod 13 for holding the molded product W is inserted into the guide hole 4k so as to be able to advance and retreat in the removal portion cavity 4f. These holding rods 13 are integrally formed with rods (reference numerals are omitted) that can be moved forward and backward by compressed air of an air cylinder (driving means constituting the present invention) 14. When the compressed air is pressed into a parison P, which will be described later, while protruding into the cavity 4f (see FIG. 3A), the holding bar 13 restrains the movement of the molded product W, and the holding bar 13 is In the state of being immersed from the removal portion cavity 4f, the molded article W is free to move.

  Next, a blow molding method for molding the molded product W using the blow molding die 1 according to the first embodiment will be described with reference to the drawings.

  First, the parison P is arrange | positioned to the said metal mold | die 1 for blow molding by a parison arrangement | positioning process. In this parison arrangement step, the one mold 3 and the other mold 4 are waiting in a retracted position where the mold is opened in advance as shown in FIG. In addition, each of the movable molds 11 of the four sets of burr clamping portions 6 arranged on the one mold 3 stands by at a retreat position in which each moving-side clamping surface 11a is separated from the clamping surface 3m. Each holding bar 13 of the four sets of molded product holding portions 7 arranged in the other mold 4 stands by at the forward end position protruding into the removal portion cavity 4f. An extrusion device (not shown) is arranged above one mold 3 and the other mold 4 shown in FIG. 1 (b), and the parison P extruded from the extrusion device is one of the molds. It hangs down between the mold 3 and the other mold 4. The parison P is extruded by the molten resin formed into a cylindrical shape by the extrusion device, and the lower ends thereof are suspended below the lower end surfaces 3h and 4h of the one and the other molds 3 and 4. Placed in a state. After this parison arrangement process, the one mold 3 and the other mold 4 are clamped by the next mold clamping process.

  In this mold clamping process, from the standby position of the mold shown in FIG. 1 where the parison P is arranged in the parison arrangement process, as shown in FIG. 2A, the one mold 3 and the other mold 4 Are advanced by a driving means (not shown), and the molds are clamped by bringing them close to each other. By this clamping, the central portion of the parison P is pressed toward the center by the cavity surfaces 3e and 4e of the one and the other molds 3 and 4, and the parting line forming portion of the parison P is The other molds 3 and 4 are sandwiched between the mating surfaces 3a and 4a, the inclined surfaces 3c and 4c, and the recessed surfaces 3d and 4d. In the state shown in FIG. 2 (a) in which one mold 3 and the other mold 4 are closest, the parison P of the portion pressed by the cavity surfaces 3e and 4e is the same as the cavity surface 3e. 4e and a part of the holding bar 13.

  On the other hand, the parison P of the portion sandwiched between the mating surfaces 3a and 4a is pressurized to maintain the mating surfaces 3a and 4a in close contact with each other through the sandwiched parison P. A thin burr portion Ba having a small thickness is formed. Further, the parison P in the portion sandwiched between the inclined surfaces 3c, 4c and the recessed surfaces 3d, 4d flows into the space formed by the recessed surfaces 3d, 4d, and the resin forming the parison P flows (filling). Therefore, a thick burr portion Bb having a large thickness is formed, and a part of this thick burr portion Bb is in each of the slide grooves 3k arranged at the four positions of the one mold 3. Thus, since the air flows into the space between each of the clamping surfaces 3m and the movable side clamping surface 11a of each movable mold 11, a bulging burr portion Bc that bulges locally is formed. After the mold clamping process, the bulging burrs Bc are respectively clamped by the next burr section clamping process.

  In this burr portion clamping step, in the mold clamping step, the movable mold 11 (see FIG. 2A) of the burr clamping portion 6 in which the bulging burr portion Bc flows into the front surface is advanced. As the movable die 11 advances, the bulging burrs Bc are respectively formed between the movable side clamping surface 11a of the movable die 11 and the clamping surface 3m of the one mold 3 as shown in FIG. 2 (b). Since the movable die 11 is pressed by the air cylinder 12 so as to maintain the state where the bulging burrs Bc are clamped, the respective bulging burrs Bc are firmly clamped. The After this burr portion clamping step, the central portion of the parison P is formed into a molded product W by the next molding step.

  In this molding step, in the parison P of the central portion pressed against the center side of the one and the other molds 3 and 4 in the mold clamping step (see FIG. 2B), for example, one mold Compressed air is press-fitted through an air nozzle (not shown) arranged at 3. When the compressed air is injected into the parison P, the parison P expands and is brought into close contact with the cavity surfaces 3e and 4e of the one and the other molds 3 and 4 as shown in FIG. The part of the molded product W is molded by being in close contact with the outer peripheral surface of the holding rod 13 constituting the molded product holding unit 7. Due to this molding, a recess Wf is formed in the portion Wb to be removed of the molded product W (see FIG. 6A), and molding is performed in the mold opening process described later by the holding rod 13 arranged in the recess Wf. Product W is held. After the molded product W is thus molded, the vicinity of the cavity surfaces 3e, 4e of the one and the other molds 3, 4 is cooled by a cooling device (not shown). By this cooling, the molded product W and the burrs B are cooled to form a molded body (see FIG. 5) solidified from the molten state. After this molding step, the one mold 3 and the other mold 4 are separated from each other and opened in the next mold opening step.

  In this mold opening process, the one mold 3 and the other mold 4 are illustrated as shown in FIG. 3B in order to separate the molded product W and the burr B molded in the molding process. It is separated by the driving means that does not. Here, the molded product W molded by the molding process shown in FIG. 3A is placed on the cavity surface 4e of the other mold 4 by the respective holding rods 13 arranged in the recesses Wf of the molded product W. The burr B is held between the movement-side clamping surface 11a of the movable mold 11 and the clamping surface 3m of the one mold 3 while being held and restricted in movement. ing. Therefore, when the one mold 3 and the other mold 4 are separated from this state, the burr B has a separation boundary Bd that is parting of the molded product W as shown in FIG. Separated from the line Wd (see FIG. 6). In addition, since the mountain-shaped unevenness | corrugation (a code | symbol is abbreviate | omitted) is formed in the movement side clamping surface 11a of the said movement type | mold 11 which opposes the clamping surface 3m of said one metal mold | die 3, respectively, The exit burr portion Bc is firmly clamped and is prevented from coming out when the one mold 3 and the other mold 4 are separated from each other. Further, in addition to the mountain-shaped irregularities formed on the moving-side holding surface 11a, a similar mountain-shaped unevenness is formed on the holding surface 3m facing the moving-side holding surface 11a, thereby holding the bulging The burr part Bc is clamped more firmly.

  In the mold opening process in this embodiment, since the entire burr B is pulled by the four bulging burr parts Bc that are sandwiched, the separation boundary part Bd of the burr B is separated from the parting line Wd of the molded product W. It can be reliably separated. As a result, it is possible to prevent the burr from being reliably separated by being punched out before the burr is torn off, like a conventional burr protruding member that is pushed in contact. It should be noted that the hardness of the molded product W and the burr B in the mold opening process should be kept slightly soft without completely curing the molded product W and the burr B during cooling of the molding process. Thus, the burrs B can be more reliably separated from the molded product W. Further, the number of the bulging burrs Bc formed on the burr B is determined by the size and shape of the molded product to be molded. By increasing the number as much as possible, the burr B can be more reliably separated from the molded product W. can do. After the mold opening process, the burr B is removed from the one mold 3 and the molded product W is removed from the other mold 4 in the next mold releasing process.

  In this demolding step, as shown in FIG. 4A, as a preparation for demolding, the holding rods 13 constituting the molded product holding section 7 are respectively removed from the cavity surface 4e of the other mold 4 as shown in FIG. At the same time, the moving side holding surface 11 a of the moving mold 11 constituting the burr holding portion 6 is separated from the holding surface 3 m of the one mold 3. Among these, the molded product W held by the holding bar 13 can be freely detached from the cavity surface 4e by immersing the holding bar 13 from the cavity surface 4e of the other mold 4 respectively. become. Further, by separating the moving side holding surface 11a of the movable mold 11 from the holding surface 3m of the one mold 3, the burr B of the burr B held between the holding surface 3m and the moving side holding surface 11a is separated. The bulging burr part Bc is released and can be freely detached. Then, the molded product W is pressed from the upper front side of the other mold 4 by a molded product pressing means (not shown) for removing the molded product W, as shown in FIG. The product W is removed from the other mold 4. Further, by pressing the burr B from the upper front side of the one mold 3 by a burr pressing means (not shown) for removing the burr B, as shown in FIG. The mold 3 is removed from one mold 3.

  Next, a blow molding die 21 according to a second embodiment will be described with reference to FIGS. The blow molding die 21 is composed of one die 23 and the other die 24 shown in FIG. 7 (a), and the blow molding die 1 according to the first embodiment described above. On the other hand, the mating surfaces 3a and 4a, the inclined surfaces 3c and 4c, and the cavities 3e and 4e and the molded product holding part 7 related to the molding of the molded product W are the same as the molded product holding unit 7, and thus the same reference numerals are given to the details. Detailed explanation is omitted.

  As shown in FIG. 7A, the one mold 23 is formed with a sandwiching surface 23d that is recessed through the inclined surface 3c on the back surface 23b side of the mating surface 3a around the mating surface 3a. The space between the sandwiching surface 23d and the back surface 23b is substantially rectangular. The other mold 24 is formed with a recessed surface 24d that is recessed through the inclined surface 4c on the back surface 24b side of the mating surface 4a, and the recessed surface 24d and the back surface 24b. The space between is formed in a rectangular parallelepiped. Further, on each of the left side 24i side and the right side 24j side of the other mold 24, clamping arms 33b of a bracket 33 to be described later are provided at a total of four locations, not shown, on the upper end surface side and the lower end surface side. Receiving receiving grooves 24m are respectively formed. Each of the receiving grooves 24m is opened at a part of the recessed surface 24d and a part of the left side surface 24i and the right side surface 24j. A part of the thick burr portion Bb of the burr B is sandwiched between the left side surface 23i side and the right side surface 23j side of the one mold 23 at four positions corresponding to the receiving grooves 24m. Four sets of burr clamping portions (clamping means constituting the present invention) 26 are arranged respectively. Note that the space formed between the clamping surface 23d of the one mold 23 and the recessed surface 24d of the other mold 24 shown in FIG. 7A is a resin-filled space constituting the present invention. .

  As shown in FIG. 7A, these burr clamping portions 26 are air cylinders 32 respectively fixed to the left side surface 23i and the right side surface 23j of the one mold 23, and the air cylinders 32 can be moved forward and backward. And a pneumatic rotating mechanism 31 that is connected to each rod 32a and is advanced and retracted with respect to the receiving groove 24m side of the other mold 24, respectively. These pneumatic rotation mechanisms 31 are each provided with a rotation mechanism portion (not shown) that is disposed in the main body 31a and is rotatable by compressed air, and these rotation mechanism portions are brackets formed in an L shape. The 33 rotation arms 33a are fixed to be rotatable. Further, a moving side holding surface 33c is formed inside the holding arm 33b orthogonal to the rotating arm 33a, and the moving side holding surface 33c is held between the moving side holding surface 33c and the holding surface 23d. In addition, chevron-shaped irregularities (reference numerals are omitted) are formed so that the thick burr portions Bb of the burrs B are not pulled out.

  Each bracket 33 has a holding position shown in FIG. 7A in which each holding arm 33b is opened outside a receiving groove 24m formed in the other mold 24, and the holding arm 33b The rotating mechanism of the pneumatic rotating mechanism 31 is closed between the receiving groove 24m and the holding position shown in FIG. 7B in which the moving-side holding surface 33c is substantially parallel to the holding surface 23d. Each part is rotated. Therefore, the thick burr portion Bb of the burr B formed between the sandwiching surface 23d and the depression surface 24d shown in FIG. The operation of the rotation mechanism 31 rotates the holding arm 33b to the position shown in FIG. 7B, and the operation of the air cylinder 32 presses the moving-side holding surface 33c of the holding arm 33b against the thick burr portion Bb. Thus, the thick burr portion Bb is sandwiched between the sandwiching surface 23d and the moving-side sandwiching surface 33c.

  Next, a blow molding method for molding the molded product W with the blow molding die 21 according to the second embodiment described above will be described with reference to the drawings. The blow molding method is similar in operation to the molding and holding of the molded product W with respect to the blow molding method according to the first embodiment described above. Is omitted.

  First, the parison P is arrange | positioned to the said metal mold | die 21 for blow molding by a parison arrangement | positioning process (refer FIG. 1). In this parison arrangement process, the brackets 33 of the four sets of burr clamping portions 26 arranged on the one mold 23 are waiting at the forward end position of the other mold 24 on the receiving groove 24m side. At the same time, the holding arm 33b of the bracket 33 stands by at a standby position (see FIG. 7A) opened outside the receiving groove 24m. Further, the holding rods 13 of the four sets of molded product holding portions 7 arranged on the other mold 24 stand by at the forward end position protruding into the removal portion cavity 4f (see FIG. 1A). ing. And the parison P extruded from the extrusion apparatus which is not illustrated is hung between one metal mold | die 23 and the other metal mold | die 24, and the lower end is lower than the lower end surface of the said one and other metal mold | die 23,24. It is arranged in a state where it hangs down. After this parison arrangement process, the one mold 23 and the other mold 24 are clamped by the next mold clamping process.

  In this mold clamping step, as shown in FIG. 7A, the one mold 23 and the other mold 24 are advanced by driving means (not shown), and the mold is clamped by being brought closest to each other. By this clamping, the central portion of the parison P is pressed toward the center by the cavity surfaces 3e and 4e of the one and the other molds 23, 24, and the parting line forming portion of the parison P is The other molds 23 and 24 are sandwiched by the mating surfaces 3a and 4a, the inclined surfaces 3c and 4c, the sandwiching surface 23d, and the depressed surface 24d. In the parison P of the parting line forming portion, a thin burr portion Ba having a small thickness is formed by the mating surfaces 3a and 4a, and a thick thickness is formed by the inclined surfaces 3c and 4c, the sandwiching surface 23d, and the depressed surface 24d. A thick burr portion Bb is formed. After the mold clamping step, the thick burr portions Bb are respectively clamped by the next burr portion clamping step.

  In this burr portion clamping step, the clamping arm 33b of each bracket 33 that has been waiting outside the receiving groove 24m in the mold clamping step is rotated counterclockwise by driving of the pneumatic rotation mechanism 31. Let By rotating these clamping arms 33b counterclockwise, the moving side clamping surface 33c of the clamping arm 33b comes into contact with the thick burr portion Bb of the burr B, as shown in FIG. Thus, the thick burr portion Bb is clamped between the movable clamping surface 33c and the clamping surface 23d, and the clamping arm 33b is driven away from the receiving groove 24m side by driving the air cylinder 32. Accordingly, each thick burr portion Bb is firmly held because it is pressed by the moving side holding surface 33c of the holding arm 33b. After this burr portion clamping step, the central portion of the parison P is formed into a molded product W by the next molding step.

  In this molding process, in the mold clamping process, compressed air is press-fitted into the parison P disposed on the center side of the one and the other molds 23 and 24 through an air nozzle (not shown). The parison P is expanded by the press-fitting of the compressed air, and as shown in FIG. 7 (b), a part of the molded product W is molded, and at the part Wb to be removed of the molded product W (see FIG. 6 (a)). A concave portion Wf is formed, and a portion of the molded product W is held by the holding rod 13 disposed in the concave portion Wf. After the molded product W is thus molded, the vicinity of the cavity surfaces 3e and 4e of the one and the other molds 23 and 24 is cooled by a cooling device (not shown). After this molding step, the one mold 23 and the other mold 24 are separated from each other and opened in the next mold opening process.

  In this mold opening process, the one mold 23 and the other mold 24 are illustrated as shown in FIG. 8A in order to separate the molded product W and the burr B molded in the molding process. It is separated by the driving means that does not. Here, the molded product W molded by the molding process is held on the cavity surface 4e of the other mold 24 by the respective holding rods 13, and the movement is restricted. The parts Bb are sandwiched between the moving-side clamping surface 33c of the clamping arm 33b and the clamping surface 23d of the one mold 23, respectively. Therefore, when the one mold 23 and the other mold 24 are separated from this state, the burr B has a separation boundary Bd that is parting of the molded product W as shown in FIG. Separated from the line Wd (see FIG. 6). Since the movement-side holding surface 33c of the holding arm 33b is formed with chevron-like irregularities (reference numerals are omitted), the sandwiched thick burr portion Bb is firmly held, and the one gold plate When the mold 23 and the other mold 24 are separated from each other, it is prevented from coming out. After the mold opening process, the burr B is removed from the one mold 23 and the molded product W is removed from the other mold 24 by the next mold releasing process.

  In this demolding step, as preparation for demolding, as shown in FIG. 8 (b), the holding bar 13 is respectively immersed from the cavity surface 4 e of the other mold 24, and the holding arm 33 is also inserted. Is moved clockwise to separate the moving side holding surface 33c of the holding arm 33b from the thick burr portion Bb of the burr B, respectively. As a result of these preparations, the molded product W held by the holding bar 13 can be freely detached from the cavity surface 4e, and the burr held between the holding surface 23d and the moving side holding surface 33c. The thick burr portion Bb of B is released and can be freely detached. Then, by pressing the molded product W from the upper front side of the other mold 24 by a molded product pressing means (not shown) for removing the molded product W, the molded product W is removed from the other mold 24. Demolded. Further, the burr B is removed from the one mold 23 by pressing the burr B from the upper front side of the one mold 23 by a burr pressing means (not shown) for removing the burr B. .

  Next, a blow molding die 41 according to a third embodiment will be described with reference to FIG. The blow molding die 41 is composed of one die 43 and the other die 44, and is a molded product W with respect to the blow molding die 1 according to the first embodiment described above. Since the mating surfaces 3a and 4a, the inclined surfaces 3c and 4c, and the cavities 3e and 4e and the molded product holding part 7 are the same, the same reference numerals are given and detailed description is omitted.

  As shown in FIG. 9A, the one mold 43 is formed with a sandwiching surface 43d that is recessed through the inclined surface 3c on the back surface 43b side of the mating surface 3a around the mating surface 3a. The space between the sandwiching surface 43d and the back surface 43b is substantially rectangular. Further, the other mold 44 is formed with a recessed surface 44d which is recessed through an inclined surface 4c on the back surface 44b side of the mating surface 4a around the mating surface 4a, and the recessed surface 44d and the back surface 44b. The space between is formed in a rectangular parallelepiped. In addition, on each of the left side 44i side and the right side 44j side of the other mold 44, there are receiving grooves for receiving a movable die 51, which will be described later, in a total of four locations, two on the upper end surface side and the lower end surface side, not shown. 44m and 44n are formed. Among these, one receiving groove 44m has a part of the recessed surface 44d and a part of the left side surface 44i and the right side surface 44j opened. The other one receiving groove 44n communicates with the receiving groove 44m, and a part of the left side surface 44i and the right side surface 44j are opened. Further, at the four positions corresponding to these receiving grooves 44m and 44n, on the left side 44i side and the right side 44j side of the other mold 44, a part of the thick burr portion Bb of the burr B is provided. Four sets of burr clamping portions (clamping means constituting the present invention) 46 to be clamped are respectively arranged. The space formed between the clamping surface 43d of the one mold 43 shown in FIG. 9 (a), the recessed surface 44d of the other mold 44, and the moving side clamping surface 51a of the movable mold 51 is as follows. It is the resin filling space which comprises this invention.

  As shown in FIG. 9A, these burr clamping portions 46 include an air cylinder 52 fixed to the left side 44i side and the right side 44j side of the other mold 44, and the air cylinder 52 The movable die 51 is connected to the rod 52a which can be moved forward and backward, and is moved forward and backward with respect to the holding surface 43d side of the one mold 43, respectively. In these movable molds 51, a movable side holding surface 51 a is formed on the front side in the forward direction in substantially the same plane as the depressed surface 44 d at the retracted end position of the movable mold 51, and the rear side is in the reverse direction. The other mold 44 is formed on a stepped surface (reference numeral is omitted) that can be inserted into the receiving grooves 44m and 44n. Further, on the moving-side holding surface 51a of the movable mold 51, a chevron-like unevenness that is hooked so that the thick burr portion Bb of the burr B held by the moving-side holding surface 51a and the holding surface 43d does not come out ( The symbols are omitted).

  The movable die 51 moves forward and backward in and out of the receiving grooves 44m and 44n of the other die 44 by the operation of the air cylinder 52, and moves the bulging burr portion Bc of the burr B at the forward end position. The moving side clamping surface 51a of the mold 51 is pressed against the clamping surface 43d of the one mold 43 to be clamped (see FIG. 9A). Therefore, the thick burr portion Bb of the burr B formed between the clamping surface 43d and the recessed surface 44d by clamping the one and the other molds 43 and 44 is moved by the operation of the air cylinder 52. When 51 is moved forward and the moving side holding surface 51a is pressed against the thick burr portion Bb, the thick burr portion Bb is held between the holding surface 43d and the moving side holding surface 51a.

  Next, a blow molding method for molding the molded product W using the blow molding die 41 according to the third embodiment described above will be described with reference to the drawings. The blow molding method is similar in operation to the molding and holding of the molded product W with respect to the blow molding method according to the first embodiment described above. Is omitted.

  First, the parison P is arranged on the blow molding die 41 by the parison arrangement process (see FIG. 1). In this parison arrangement process, the movable molds 51 of the four sets of burr clamping portions 46 arranged in the one mold 43 wait at the retracted end positions in the receiving grooves 44m and 44n (see FIG. 9A). ing. Further, the holding rods 13 of the four sets of molded product holding portions 7 arranged on the other mold 24 stand by at the forward end position protruding into the removal portion cavity 4f (see FIG. 1A). ing. And the parison P extruded from the extrusion apparatus which is not illustrated is hung between one metal mold | die 43 and the other metal mold | die 44, and the lower end is below the lower end surface of the said one and other metal mold | die 43,44. It is arranged in a state where it hangs down. After this parison arrangement process, the one mold 43 and the other mold 44 are clamped by the next mold clamping process.

  In this mold clamping step, as shown in FIG. 9A, the one mold 43 and the other mold 44 are advanced by a driving means (not shown), and the mold is clamped by being brought closest to each other. By this clamping, the central portion of the parison P is pressed toward the center by the cavity surfaces 3e and 4e of the one and the other molds 43 and 44, and the parting line forming portion of the parison P is The other molds 43 and 44 are sandwiched by the mating surfaces 3a and 4a, the inclined surfaces 3c and 4c, the sandwiching surface 43d, and the depressed surface 44d. In the parison P of the parting line forming portion, a thin burr portion Ba having a small thickness is formed by the mating surfaces 3a and 4a, and a thick thickness is formed by the inclined surfaces 3c and 4c, the sandwiching surface 43d, and the depressed surface 44d. A thick burr portion Bb is formed. After the mold clamping step, the thick burr portions Bb are respectively clamped by the next burr portion clamping step.

  In this burr portion clamping step, each movable die 51 waiting at the retracted end position in the receiving grooves 44m, 44n of the other die 44 in the mold clamping step is advanced by driving the air cylinder 52. Let By advancing these movable dies 51, each thick burr | flash part Bb is pressurized by the movement side clamping surface 51a of this movement type | mold 51, and it is firmly between this movement side clamping surface 51a and the said clamping surface 43d. Sandwiched between. After this burr portion clamping step, the central portion of the parison P is formed into a molded product W by the next molding step.

  In this molding process, in the mold clamping process, compressed air is press-fitted into the parison P arranged on the center side of the one and the other molds 43 and 44 through an air nozzle (not shown). The parison P is expanded by the press-fitting of the compressed air, and a part of the molded product W is molded (see FIG. 3A), and a recess is formed in the planned removal portion Wb of the molded product W (see FIG. 6A). Wf is formed, and the portion of the molded product W is held by the holding bar 13 disposed in the recess Wf. After the part of the molded product W is molded in this way, the vicinity of the cavity surfaces 3e and 4e of the one and the other molds 43 and 44 is cooled by a cooling device (not shown). After this molding step, the one mold 43 and the other mold 44 are separated from each other and opened in the next mold opening process.

  In this mold opening process, the one mold 43 and the other mold 44 are separated by a driving means (not shown) so as to separate the molded product W and the burr B molded in the molding process. Here, the molded product W at the stage of the molding process is held by the cavity surface 4e of the other mold 44 by the respective holding rods 13 and is restrained from moving, and the burr B has a thick burr portion. Bb is clamped between the movable clamping surface 51a of the movable mold 51 and the clamping surface 43d of the one mold 43 (see FIG. 9A). Therefore, when the one mold 43 and the other mold 44 are separated from this state, and the movable mold 51 is advanced by driving the air cylinder 52, the burr B has a separation boundary Bd. It is separated from the parting line Wd of the molded product W (see FIG. 6). If the forward movement of the movable mold 51 is stopped in the course of the separation operation and the one mold 43 and the other mold 44 are further separated from each other, as shown in FIG. The part Bb is separated from the moving side holding surface 51 a of the moving mold 51, and only the burr B is moved together with the one mold 43. Since the movement-side clamping surface 51a of the movable mold 51 is formed with chevron-shaped irregularities (not shown), the sandwiched thick burr portion Bb is firmly clamped, and the one gold plate When the mold 43 and the other mold 44 are separated from each other, it is prevented from coming out. After the mold opening process, the burr B is removed from the one mold 43 and the molded product W is removed from the other mold 44 by the next mold releasing process.

  In this demolding step, as preparation for demolding, the holding rods 13 are respectively immersed from the cavity surface 4e of the other mold 44 (see FIG. 4A), and the movable mold 51 is The other mold 44 is retracted to the retracted end position in the receiving grooves 44m, 44n. With these preparations, the molded product W held by the holding bar 13 can be freely detached from the cavity surface 4e. Then, by pressing the molded product W from the upper front side of the other mold 44 by a molded product pressing means (not shown) for removing the molded product W, the molded product W is removed from the other mold 44. Demolded. Further, the burr B is removed from the one mold 43 by pressing the burr B from the upper front side of the one mold 43 by a burr pressing means (not shown) for removing the burr B. .

  The present invention is not limited to the above-described embodiment. For example, the slide groove formed in one mold in the first embodiment is a cavity surface formed in the one mold. The movable mold and the slide groove may be arranged or formed at one place above and below the bottom. Further, it may be arranged or formed at one place, for example, on the left or right side above the cavity surface, or at one place, for example, on the right or left side below the cavity surface. Further, depending on the shape of the molded product, the movable mold and the slide groove are respectively arranged or formed on the left and right sides above the cavity surface, and the movable mold and the slide groove are disposed or formed at one central position below the cavity surface. It may be what you did.

  In addition, the above-described molded product holding part projects the holding bar (protruding part constituting the present invention) in advance to the inside of the cavity surface of the other mold, and then clamps one and the other molds, Subsequently, the compressed air is pressed into the sealed parison to explain the method of molding the molded product by one and the other cavity surface. However, according to the configuration described above, the method is not limited to this. In addition, it can be formed by the following second and third methods. Among these, in the second method, the above-mentioned one and other molds are clamped, and then a molded product is molded by one and the other cavity surfaces by press-fitting compressed air into the sealed parison. Later, the protruding portion is protruded into the parison. Further, in the third method, the one and the other molds are clamped, and then the protruding portion is inserted into the sealed parison, and then compressed air is pressed into the inside of the parison. Is a method of molding a molded product by one and the other cavity surface. And by the protrusion of the said protrusion part, this protrusion part is stabbed inside the said cutting scheduled part. Thereafter, when the one and the other molds are separated from each other (opened), the molded product is held on the other mold side by the projecting portion and the one mold (with the burr sandwiched therebetween) is used. Therefore, only the burrs are removed.

DESCRIPTION OF SYMBOLS 1 Mold for blow molding 3 One mold 3a Mating surface 3d Recessed surface 3e Cavity surface 3k Slide groove 3m Holding surface 4 The other metal mold 4a Mating surface 4d Recessed surface 4e Cavity surface 6 Burr holding portion 7 Molded product holding portion 11 Moving type 11a Moving side clamping surface 13 Holding rod B Burr P Parison W Molded product

Claims (7)

A mold for blow molding comprising one mold having one cavity surface and the other mold having the other cavity surface,
A position separated from the formation position of the one and the other cavity surface, formed on the one mold or the one mold and the other mold, and the one mold and the other mold are A resin-filled space filled with a part of the resin that becomes a burr when the mold is clamped;
A sandwiching means that is disposed in the one mold or the other mold and sandwiches a resin that is a part of a burr filled in the resin filling space;
A holding means arranged in the other mold and holding a molded product formed by the cavity surfaces of the one and the other mold;
With
While holding the molded product on the other mold side through the holding means, and holding the resin as a part of the burr on the one mold side through the holding means, the one and the other A mold for blow molding, wherein the mold is configured to open the mold. The resin-filled space is a slide groove formed in the one mold and having a clamping surface at the end,
The clamping means is disposed in the slide groove, and advances in the clamping surface direction while being guided by the slide groove, and clamps a part of the burr in which the resin is cured in cooperation with the clamping surface. The blow mold according to claim 1, further comprising a movable mold that moves backward in a direction away from the clamping surface after the one mold is separated from the other mold.   The movable die is formed with a moving-side holding surface that opposes the holding surface, and both or one of the holding surface and the moving-side holding surface is formed with a concave or convex portion. The blow mold according to claim 2.   4. The blow mold according to claim 2, wherein a plurality of the movable mold and the slide groove are arranged or formed with respect to the one mold. 5.   The movable mold and the slide groove are arranged or formed on the left and right sides above the cavity surface with respect to the one mold, and are arranged or formed on both the left and right sides below the cavity surface. The blow mold according to claim 2, 3 or 4. The cavity surface of the other mold comprises a portion for molding a portion to be removed from which a part of the molded product is removed by cutting after being molded by the cavity surface,
The holding means for holding the molded product is capable of projecting and immersing inside the cavity surface of the part for molding the part to be removed of the other mold, and the one mold and the other mold A protrusion having a length in a direction orthogonal to the approaching / separating direction of the metal, and driving means for projecting / immersing the protrusion inside the cavity surface of the other mold. 6. The blow mold according to claim 1, 2, 3, 4 or 5. The process of arrange | positioning the melted parison between one metal mold | die and the other metal mold | die which were mutually spaced apart using the blow mold in any one of the said Claim 1, 2, 3, 4, 5 or 6 When,
One of the molds and the other mold are clamped, and one of the resins serving as burrs in the resin mold space or slide groove formed in the one mold or the one mold and the other mold. Filling the part and press-fitting compressed air into the inside of the parison to form a molded product,
The step of clamping by the clamping means arranged in the resin filling space or the slide groove, or the movable die is moved to the clamping surface side, and a part of the burr filled in the slide groove is moved to the movable die and the clamping surface. And sandwiching between
A step of holding the molded product by the holding means arranged in the other mold,
Separating the one mold from the other mold and opening the mold;
A blow molding method comprising: