JP2005211918A - Molding die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding die which has a movable core and secures air-tightness in a cavity by simple constitution. <P>SOLUTION: The molding die is provided with a fixed die 1, a movable die 2 and the movable core 3, wherein a sealing member 8 is disposed on a mating surface 3c of the movable core 3 where the movable core 3 abuts on the movable die 2. The sealing member 8 has both end parts 8a, 8a exposed to a surface where the movable core 3 abuts on the fixed die 1 and forms the pieces dividing the sealing ring in the peripheral direction. A sealing ring 7 is disposed on the mating surfaces 1c, 1d of the fixed die 1 where the fixed die 1 abuts on the movable die 2 and the movable core 3, respectively. When the fixed die 1, the movable die 2 and the movable core 3 are abutted on the their respective mating surfaces, the both end parts 8a, 8a of the sealing member 8 overlap the sealing ring 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mold, and more particularly to a mold used in a state where the inside of a cavity is decompressed.

  The vacuum casting method is a casting method in which a gas (air, water vapor, etc.) in a cavity of a mold is exhausted to decompress the inside of the cavity and introduce molten metal into the cavity. Thereby, entrainment of gas and water remaining in the cavity can be prevented, and the quality of the casting can be improved. The higher the degree of vacuum in the cavity, the better the quality of the casting. However, in order to increase the degree of vacuum, the airtightness of the cavity part is required. There are various methods for securing the airtightness depending on the part of the mold, but it is most common to apply a sealing material such as an O-ring on the mating surface (parting surface) of the mold.

Here, if the structure of the mold is a simple two-sheet mold (see FIG. 5), if the O-ring is applied to the mating surfaces of the pair of molds, the airtightness in the cavity is sufficiently maintained. Become. However, when the shape of the product becomes complicated, a moving core that moves in a direction substantially perpendicular to the moving direction of the moving type is required in addition to the moving type and the fixed type. However, when the moving core has a mating surface between the movable type and the fixed type, it is necessary to ensure airtightness on all the mating surfaces. As means for ensuring the airtightness of the moving core portion, for example, there is a technique disclosed in Japanese Patent Application Laid-Open No. 7-047457 (Patent Document 1). The technique disclosed in Patent Document 1 provides a seal ring that is movable separately from the moving core, and moves the seal ring relative to the moving core, thereby ensuring airtightness in the moving core portion. It is what I did. In the present specification, the “molding die” is a general term for molding a mold even when a cavity is filled with a raw material.
JP-A-7-047457

  However, in the technique disclosed in Patent Document 1, it is necessary to separately provide a mechanism for ensuring airtightness in the moving core portion, and the structure becomes complicated compared to the conventional mold structure. For this reason, there is a problem that a significant design change is required.

  The present invention has been made in view of such circumstances, and provides a mold that can ensure airtightness in a cavity with a simpler configuration in a mold having a moving core. Is an issue.

  In order to solve the above-described problems of the present invention, a mold according to the present invention includes a first mold, a second mold that forms a cavity in contact with the first mold, and an insertion formed in the mold. A moving core that is inserted into the hole and advances and retreats with respect to the cavity, and has a mating surface for both the first mold and the second mold, and the first mold and the second mold A first seal member disposed on a first mating surface with which the mold abuts, a second seal member disposed on a second mating surface with which the first mold and the moving core abut, and the second A third seal member disposed on a third mating surface where the mold and the movable mold come into contact, and the first mold, the second mold, and the movable core are When the first mating surface, the second mating surface, and the third mating surface are in contact with each other, Outer edge of the seal member and the second sealing member and the third sealing member is characterized in that it is arranged to form a closed curve. In the present specification, the “curve” includes a part of which is linear.

  Further, in the molding die of the present invention, the first mating surface and the third mating surface are continuous surfaces that respectively contact the first molding die and the moving core of the second molding die, The first seal member and the third seal member are arranged continuously over the first mating surface and the third mating surface of the second mold. Here, the first seal member and the third seal member can be a single seal member formed integrally. That is, in one seal member, the portion disposed on the first mating surface of the second mold is regarded as the first seal member, and the portion disposed on the third mating surface of the second mold is defined as the third seal member. Can be considered.

  More specifically, when the first mold and the moving core abut on the second mating surface, the surface of the first mold that abuts on the second mold and the moving core A first flat surface that is continuous with a surface that contacts the second mold is formed, and a region that contacts the first mold and the movement in the second plane of the second mold that contacts the first plane The seal member may be continuously arranged over the region in contact with the core. Here, in the second plane of the second mold, the region that contacts the first mold can be regarded as the first mating surface, and the region that contacts the moving core is regarded as the third mating surface. be able to. Further, in the sealing member disposed on the second plane of the second mold, the portion disposed on the first mating surface of the second plane can be regarded as the first sealing member described above, and the third mating is performed. The portion arranged on the surface can be regarded as the above-described third seal member. That is, the first seal member, the second seal member, and the third seal member may be formed as three seal members formed separately, but as described above, one seal member formed integrally. It may be considered as a separate area. In particular, a mode in which one seal ring constituted by the first seal member and the third seal member is arranged on the second plane of the second mold can be exemplified.

  On the other hand, in the molding die of the present invention, the second mating surface and the third mating surface are continuous surfaces that respectively contact the first molding die and the second molding die of the moving core, The second seal member and the third seal member are arranged continuously over the second mating surface and the third mating surface of the moving core. Here, the second seal member and the third seal member can be a single seal member formed integrally. That is, in one seal member, the portion disposed on the second mating surface of the moving core is regarded as the second seal member, and the portion disposed on the third mating surface of the moving core is regarded as the third seal member. Can do.

  Furthermore, the first seal member, the second seal member, and the third seal member include at least two seals when the first molding die, the second molding die, and the moving core are in contact with each other at their mating surfaces. It can be arranged so that a seal ring is constituted by a member. That is, the first seal member, the second seal member, and the third seal member can be regarded as a fragment in which the seal ring is divided in the circumferential direction, and the first mold, the second mold, and the moving core are It can be considered that the divided end portions of one seal member are connected to the divided end portions of the other seal members when they contact each other at the mating surfaces.

  Here, the first seal member, the second seal member, and the third seal member constitute one complete seal ring by at least two of the seal members, and the remaining one seal member Is a fragment in which the seal ring is divided in the circumferential direction, and the seal ring is divided when the first mold, the second mold, and the moving core abut each other at their mating surfaces. The two ends of the cut piece may be arranged so as to overlap with different parts of the one complete seal ring, respectively. For example, the first seal member and the third seal member constitute a complete seal ring, and the second seal member constitutes a fragment of the seal ring whose both ends overlap the complete seal ring. It can be illustrated.

  In addition, the shaping | molding die of this invention shall be used when casting a magnesium alloy (including magnesium) and an aluminum alloy (including aluminum) by die casting, for example. In addition, it can be used for resin molding such as resin injection molding. Moreover, the material used for the mold is not particularly limited, but sufficient heat resistance and strength are required depending on the object to be handled. When performing casting or resin injection molding, a mold can be used as a mold.

  According to the present invention, in a molding die having a moving core, a sealing member (first sealing member) is arranged on a mating surface (first mating surface) between the first molding die and the second molding die constituting the cavity. As well as ensuring airtightness between the first mold and the second mold, the mating surface (second mating surface) between the first mold and the moving core and the alignment between the second mold and the moving core Seal members (second seal member and third seal member) are disposed on the surfaces (third mating surfaces), respectively, and are disposed on the first mating surface, the second mating surface, and the third mating surface, respectively. The first seal member, the second seal member, and the third seal member are configured such that, when the first mold, the second mold, and the moving core are in contact with each other on their mating surfaces, their outer edge portions are closed curves. So that it is not only between the first mold and the second mold. , Airtightness between the mobile core and the first mold and the second mold also can be sufficiently secured. In other words, the seal member provided separately is overlapped when the moving core and the mold come into contact with each other, and the outer edge portion forms a closed curve surrounding the cavity, so that outside air can enter the cavity. Conversely, the atmosphere in the cavity does not leak outside. Usually, in the case of a pair of molds without a moving core, the mating surfaces can be sealed if a sealing member whose outer edge portion forms a closed curve so as to surround the cavity is disposed on the mating surface. Similarly, in the present invention, the sealing members are arranged on all the mating surfaces, and when the mold and the moving core come into contact with each mating surface, the outer edges of these sealing members surround the cavities. If the closed curve is formed, it is possible to reliably perform sealing on all the mating surfaces as in the case of a mold having no moving core. As described above, according to the present invention, in a mold having a moving core, a seal member is simply arranged on a mating surface without providing a special sealing mechanism for the moving core as in the prior art. With the configuration, airtightness at the mating surfaces can be ensured. Therefore, the inside of a cavity can fully be pressure-reduced and a product with better quality can be manufactured more easily.

  Furthermore, the first mating surface and the third mating surface are continuous surfaces that abut each of the first molding die and the moving core of the second molding die. By arrange | positioning, a 1st seal member and a 3rd seal member can be comprised as an integral seal member. Therefore, when the first molding die, the second molding die, and the moving core come into contact with each other at the respective mating surfaces, this integral sealing member (comprised of the first sealing member and the third sealing member). By sufficiently overlapping the second seal member and the second seal member, it is possible to ensure airtightness at all the mating surfaces. That is, compared with the case where the first seal member, the second seal member, and the third seal member are separate members, the portion where the seal members are sufficiently overlapped is reduced, so that it is easier to ensure the airtightness in the cavity. It will be. In particular, when the first mating surface and the third mating surface are two different regions in the plane facing the first mold and the moving core of the second mold, the first seal member and the third mating surface are in the plane. Since only one seal member regarded as three seal members may be arranged, the arrangement of the seal members becomes simpler. That is, when the first mating surface and the third mating surface are surfaces that are continuous so as to form an angle, a bent portion is formed between the first mating surface and the second mating surface. Therefore, the seal member also needs to be arranged across the bent portion. However, if the configuration is as described above, one seal member may be arranged continuously in a simple plane, and the seal member is arranged at the bent portion. There is no difficulty to do.

  Further, as the seal member, when the first mold, the second mold, and the moving core are brought into contact with each other on the respective mating surfaces, a seal ring shall be constituted by at least two seal members. Thus, since the seal ring conventionally used as a seal member can be used in the present invention by changing its form, the present invention can be realized more easily. In this case, the at least one seal member is a fragment obtained by dividing the seal ring in the circumferential direction, and the end portions of this fragment are overlapped with other seal members to realize a form in which these seal members form a closed curve. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the present embodiment, a casting mold used for die casting is illustrated as a mold. Drawing 1 is a mimetic diagram showing the outline in the first embodiment of the forming die of the present invention. Fig.1 (a) shows sectional drawing of the shaping | molding die 10 of this invention. As shown in FIG. 1A, the molding die 10 is composed of a movable die 2 as a first molding die and a fixed die 1 as a second molding die. Are brought into contact with each other at the mating surface, whereby the cavity 4 is formed. Casting can be performed by filling the cavity 4 with molten metal. When casting, a machine sleeve (not shown) is connected to the mold sleeve 5 of the movable mold 2, and the molten metal is filled into the cavity 4 through the mold sleeve 5 from a hot water supply port (not shown) formed in the machine sleeve. Is done. Further, the molding die 10 of the present embodiment is a vacuum casting mold in which the atmosphere in the cavity 4 is decompressed to perform casting, and has a gas vent hole (not shown) for decompressing the inside of the cavity 4. ing.

  Moreover, FIG.1 (b) is the top view which looked at the movable mold | type 2 from the arrow a direction in the AA line of Fig.1 (a). As shown in FIG. 1 (b), an insertion hole 2a is formed in the movable die 2, and the slide core 3a of the moving core 3 slides in the insertion hole 2a and can move forward and backward with respect to the cavity 4. Are arranged as follows. Furthermore, the movable core 3 has a flange 3 b that abuts against the end 2 b of the movable mold 2, and this slide 3 b abuts against the end 2 b of the movable mold 2 so that the slide core 3 a is in the cavity 4. Positioned with.

  FIG. 1C is an external view of the mold 10, and the fixed mold 1 is brought into contact with the movable mold 2 and the movable core 3 in the state of FIG. This shows the state. Moreover, FIG.1 (d) is the top view which looked at the shaping | molding die 10 of FIG.1 (c) from b direction. As shown in FIG. 1 (c), the fixed die 1 is provided with a region 1 b that mainly contacts the movable die 2 and a region 1 a that mainly contacts the movable core 3. That is, the flange portion 3 b of the moving core 3 is in contact with the movable mold 2 and is also in contact with the fixed mold 1.

  As described above, the mold 10 according to the present embodiment is a mold mainly used in the vacuum casting method, and the casting is performed while the cavity 4 is decompressed. Therefore, it is necessary to ensure the airtightness in the cavity 4. There is. As described above, when the movable core 3 has a mating surface between both the fixed mold 1 and the movable mold 2, not only between the fixed mold 1 and the movable mold 2, but also between the fixed mold 1 and the movable mold 2. It is also necessary to seal between the child 3, the movable mold 2 and the movable core 3. Therefore, a sealing mechanism for ensuring airtightness in the cavity 4 will be described.

  First, with respect to ensuring airtightness between the moving core 3 and the movable mold 2, as shown in FIGS. 1B and 1D, a seal is provided between the moving core 3 and the movable mold 2. This is done by arranging the member 8. More specifically, the moving core 3 is formed with a mating surface 3c (first mating surface) that comes into contact with the movable die 2 (first molding die), and a seal member 8 (first mating surface) is formed on the mating surface 3c. Two seal members) are arranged. As shown in FIGS. 1B and 1D, the seal member 8 is a fragment obtained by dividing the seal ring in the circumferential direction. The seal member 8 is formed on the surface 3 d that contacts the movable mold 2 of the movable core 3. Both ends 8a, 8a are arranged in a U shape so that they are exposed. For this reason, as shown in FIG. 1B, since both end portions 8a and 8a of the seal member 8 do not overlap with other seal members only by bringing the movable core 3 and the movable mold 2 into contact with each other, they move completely. The space between the core 3 and the movable mold 2 cannot be sealed.

  Next, regarding airtightness securing between the movable mold 2 and the fixed mold 1, as shown in FIGS. 1C and 1D, a sealing member is provided between the fixed mold 1 and the movable mold 2. This is done by arranging 7. More specifically, the fixed die 1 is formed with a mating surface (first mating surface) 1c that comes into contact with the movable die 2, and a seal member (first seal member) 7 is disposed on the mating surface 1c. ing. The mating surface 1 c of the fixed mold 1 is formed in a region 1 b that mainly contacts the movable mold 2 of the fixed mold 1. On the other hand, with respect to ensuring airtightness between the moving core 3 and the fixed mold 1, as shown in FIGS. 1C and 1D, a seal is provided between the moving core 3 and the fixed mold 1. This is done by arranging the member 7. More specifically, the fixed mold 1 is formed with a mating surface (third mating surface) 1d that contacts the moving core 3, and a seal member (third seal member) 7 is disposed on the mating surface 1d. Has been. The mating surface 1 d of the fixed mold 1 is formed in a region 1 a that mainly contacts the moving core 3 of the fixed mold 1. Here, the region 1 a and the region 1 b of the fixed mold 1 form a continuous plane facing the movable mold 2 and the movable core 3. Further, a seal member (first seal member) that secures airtightness between the fixed mold 1 and the movable mold 2 and a seal member (third seal) that secures airtightness between the movable core 3 and the fixed mold 1. The seal member is a part of the seal member 7, and the seal member 7 is continuously arranged over the region 1 a and the region 1 b of the fixed mold 1.

  That is, when the movable die 2 and the movable core 3 abut on the second mating surface 3c, the surface that abuts the fixed die 1 of the movable die 2 and the surface that abuts the fixed die 1 of the movable core 3 are continuous. The first flat surface is formed, and in the second flat surface (first mating surface and third mating surface) of the fixed mold 1 that abuts the first plane, the region 1b that abuts the movable mold 2 and the moving core 3 One seal member 7 is continuously arranged over the area 1a in contact therewith. Here, the seal member 7 disposed on the second plane of the fixed mold 1 is a complete seal ring 7.

  The airtightness between the fixed mold 1 and the movable mold 2 is ensured by a part (first seal member) of the seal ring 7 formed in the region 1b in contact with the movable mold 2 of the fixed mold 1. Become. In addition, a part of the seal ring 7 (second seal member) formed in the region 1 a in contact with the moving core 3 of the fixed mold 1 ensures airtightness between the fixed mold 1 and the moving core 3. Will be.

  Here, the seal ring 7 is disposed so as to surround the cavity 4 and the slide core 3 a of the moving core 3 on the mating surface 1 c of the fixed mold 1, and comes into contact with the movable mold 2 of the fixed mold 1. From the viewpoint of only the mating surface (first mating surface) 1c in the region 1b, the seal ring can be regarded as a fragment (first seal member) divided in the circumferential direction. Further, the seal ring 7 is a fragment (third seal member) obtained by dividing the seal ring in the circumferential direction as far as the mating surface (third mating surface) 1d of the region 1a in contact with the moving core 3 of the fixed mold 1 is concerned. Can be considered.

  Then, as shown in FIGS. 1C and 1D, when the fixed mold 1, the movable mold 2, and the movable core 3 are brought into contact with each other on the respective mating surfaces, the sealing member 8 is fixed. Both end portions 8a and 8a exposed toward the mold 1 are overlapped with the seal ring 7 disposed in the fixed mold 1, and a closed curve surrounding the cavity 4 is formed by the seal ring 7 and the seal member 8. It has come to be. That is, the seal ring 7 forms a closed curve by itself, and the seal member 8, which is a fragment obtained by dividing the seal ring in the circumferential direction, connects the seal ring 7 and both end portions 8a and 8a, thereby A closed curve is formed together with a part of the ring 7. In this way, when the fixed mold 1 and the movable mold 2 are combined, the fixed mold 1 and the movable mold 2 can be simultaneously moved between the fixed mold 1 and the movable core 3 and between the movable mold 2 and the movable core 3. It becomes possible to seal.

  Next, the operation in the case of performing the reduced pressure casting method using the mold 10 of the present embodiment will be described. First, as shown in FIG. 2A, a moving core 3 in which a sealing member 8 that is a fragment obtained by dividing a seal ring in the circumferential direction is disposed on a mating surface 3c is connected to a driving device such as a hydraulic cylinder (not shown). Is moved forward with respect to the movable mold 2. Here, the mating surface 3c of the moving core 3 comes into contact with the movable die 2, and the seal member 8 disposed on the mating surface 3c also comes into contact with the movable die 2 (see FIG. 2B). Thereby, between the movable mold | type 2 and the movable core 3, airtightness is ensured although it is incomplete.

  Next, in a state where the movable core 3 is in contact with the movable mold 2 on the mating surface 3c, the movable mold 2 is advanced toward the fixed mold 1 as shown in FIG. At this time, a seal ring 7 is disposed on the planes (1c, 1d) facing the movable mold 2 and the movable core 3 of the fixed mold 1, and the seal ring 7 allows the fixed mold 1 and the movable mold 2 to be connected. Airtightness will be ensured. Furthermore, airtightness between the fixed mold 1 and the moving core 3 is also ensured. Further, when the fixed mold 1, the movable mold 2, and the movable core 3 come into contact with each other, both end portions 8 a and 8 a of the seal member 8 overlap the seal ring 7. The seal between the mold 2 is complete.

  The first embodiment of the present embodiment has been described above, but the present invention is not limited to such a form. That is, it can also be set as the shaping | molding die 20 concerning 2nd embodiment as shown in FIG. The molding die 20 according to the second embodiment has basically the same configuration as the molding die 10 according to the first embodiment, and those having the same configuration / action are denoted by the same reference numerals. I will explain. FIG. 4A shows a cross-sectional view of the mold 20 of the present embodiment, and FIG. 4B shows the movable mold 2 and the A-A line in FIG. FIG. 3 is a plan view of the moving core 3 as viewed. FIG. 4C is an external view of the mold 20 when the movable mold 2 and the movable core 3 in the state of FIG. 4B are in contact with the fixed mold 1. FIG. 4D is an external view of the molding die 20 shown in FIG.

  In the mold 20 shown in FIG. 4, the seal member that seals between the fixed mold 1 and the movable mold 2 is the seal member 22 that is disposed on the surface of the movable mold 2 that contacts the fixed mold 1. In addition, the molding shown in FIG. 1 is that the seal member that seals between the moving core 3 and the fixed mold 1 is the seal member 21 that is disposed on the surface that contacts the fixed mold 1 of the moving core 3. Different from mold 10. That is, the surface 2c that contacts the fixed mold 1 of the movable mold 2 is the first mating surface on which the seal member 22 as the first seal member is disposed, and the surface 3d that contacts the fixed mold 1 of the movable core 3 is The third mating surface on which the seal member 21 as the third seal member is disposed.

  Here, a seal member (second seal member) is disposed on the surface 3c (second mating surface) of the moving core 3 that contacts the movable die 2 in the same manner as the molding die of FIG. Is integral with the seal member 21 disposed on the third mating surface 3d of the moving core 3. That is, the mating surface (second mating surface) 3c that comes into contact with the movable die 2 of the moving core 3 and the mating surface (third mating surface) 3d that comes into contact with the fixed die 1 are continuous surfaces. As shown in (b) and (d), one seal member 21 is disposed continuously over the continuous second mating surface 3c and the third mating surface 3d.

  In the present embodiment, the second mating surface 3c and the third mating surface 3d intersect each other vertically, and are continuous in a form having a bent portion therebetween. The seal member 21 forms a complete seal ring 21 that is continuously arranged across the bent portion.

  On the other hand, the seal member 22 disposed on the first mating surface 2c of the movable die 2 is a fragment obtained by dividing the seal ring in the circumferential direction, and is a surface that contacts the movable core 3 of the movable die 2. In 2b, as shown in FIGS. 4B and 4D, both end portions 22a and 22a are exposed. Furthermore, both end portions 22 a and 22 a of the seal member 22 are disposed so as to overlap the seal ring 21 when the seal ring 21 disposed on the moving core 3 contacts the movable mold 2. Therefore, when the movable die 2 and the movable core 3 are brought into contact with each other on the mating surface, the seal member 22 forms a closed curve together with a part of the seal ring 21.

  According to the configuration described above, the seal ring 21 disposed on the movable core 3 is moved forward by moving the movable core 3 relative to the movable mold 2 and bringing the movable core 3 into contact with the movable mold 2. And both end portions 22 a and 22 a of the seal member 22 overlap, and the closed curve that surrounds the cavity 4 is formed by the seal member 22 and the seal ring 21. Thereby, when the movable core 3 is brought into contact with the movable mold 2, a seal between the movable mold 2 and the movable core 3 is completely ensured. Then, the seal members 22 and 21 are arranged over the first mating surface 2c facing the fixed mold 1 of the movable mold 2 and the third mating surface 3d facing the fixed mold 1 of the movable core 3. Then, the fixed mold 1 is brought into contact with the first mating surface 2c and the third mating surface 3d, so that the seal between the movable mold 2 and the fixed mold 1 and between the movable core 3 and the fixed mold 1 is obtained. Can be secured.

  Although the present embodiment has been described above, the present invention is not limited thereto. In the two embodiments described so far, of the three seal members of the first seal member, the second seal member, and the third seal member disposed on the mating surfaces of the movable type, the fixed type, and the movable core, respectively. The two seal members are merely considered as different regions of a complete seal ring, but other forms can be envisaged. For example, the first seal member, the second seal member, and the third seal member are all configured as fragments obtained by dividing the seal ring in the circumferential direction, and the movable type, the fixed type, and the movable core are respectively combined. An example can be illustrated in which both end portions of these sealing members are arranged so as to overlap when brought into contact with each other on the surface.

  In the present embodiment, the description of the movable mold and the fixed mold is used. However, in the present invention, the first mold may be either the movable mold or the fixed mold. What is performed may be either a movable type or a fixed type. It is sufficient if at least one of the molds moves relative to the other, and both molds may move and approach each other.

  In order to examine the effect of the present invention, the following experiment was conducted. First, a mold 30 (comparative example) having no moving core as shown in FIG. 5 was manufactured. Fig.5 (a) is sectional drawing of the shaping | molding die 30 concerning a comparative example. As shown in FIG. 5A, the molding die 30 has a fixed die 1 and a movable die 2, and the fixed die 1 and the movable die 2 form a cavity 4. FIG. 5B is a plan view of the movable mold 2 viewed from the direction c along the line CC in FIG. As shown in FIG. 5 (b), a seal ring 31 is disposed on the surface (mating surface) of the mold 30 that faces the fixed mold 1 of the movable mold 2 so as to surround the cavity 4. As described above, the molding die 30 has the same configuration as the molding die 10 according to the present invention shown in FIG. 1 except that it does not have a moving core and the arrangement of the sealing members is different. . The material of the fixed mold 1 and the movable mold 2 is a die casting steel (SKD61), and the material of the seal ring 31 is fluororubber.

  Next, in the mold 30 as described above, after forming the cavity 4 as shown in FIG. 5A, the atmosphere in the cavity 4 is sucked by a suction device (not shown) to depressurize the cavity 4. It was. The suction device used is R5A-0040 manufactured by Nippon Bush Co., Ltd. And when the inside of the cavity 4 was fully depressurized, the suction inside the cavity 4 was stopped. The time change of the pressure in the cavity 4 at that time is shown in FIG.

  On the other hand, a mold 10 (Example) according to the present invention as shown in FIG. 1 was produced. The materials of the fixed mold 1 and the movable mold 2 are the same as those of the comparative example, and the materials of the seal ring 7 and the seal member 8 are the same as those of the seal ring 31 of the comparative example. Then, as shown in FIG. 1, the fixed mold 1, the movable mold 2, and the movable core 3 are brought into contact with each other to form the cavity 4, and then the atmosphere in the cavity 4 is sucked by a suction device (not shown). The inside was depressurized. The suction device used is R5A-0040 manufactured by Nippon Bush Co., Ltd. The time change of the pressure in the cavity 4 at that time is shown in FIG.

  As can be seen by comparing FIGS. 6A and 6B, according to the mold 10 according to the example, the pressure in the cavity 4 is changed from that of the mold 30 according to the comparative example having no moving core. Similarly, it can be lowered (1.3 to 2.6 kPa). Further, it can be seen that even after the suction in the cavity 4 is stopped, the pressure in the cavity 4 hardly changes as in the comparative example, and the inside of the cavity 4 can be sufficiently sealed. The amount of leakage leaked from the cavity 4 after the suction in the cavity 4 was stopped was 106 kPa / sec in both the mold 30 and the mold 10.

  As described above, in the mold according to the present invention, even if it has a moving core, the airtightness in the cavity is sufficient with a simple configuration as in the case of a mold having no moving core. Can be secured.

Schematic which shows the shaping | molding die concerning embodiment of this invention. The figure explaining operation | movement of the shaping | molding die concerning embodiment of this invention. The figure explaining operation | movement of the shaping | molding die concerning embodiment of this invention. Schematic which shows the shaping | molding die concerning embodiment of this invention. The schematic diagram showing a mold according to a comparative example. The graph which shows the experimental result which concerns on the Example of this invention.

Explanation of symbols

1 Fixed mold (second mold)
1c 1st mating surface 1d 3rd mating surface 2 Movement type (1st shaping | molding die)
3 moving core 3c second mating surface 4 cavity 5 type sleeve 7 seal ring (first seal member, third seal member)
8 Seal member (second seal member)
10, 20 Mold 21 Seal ring (second seal member, third seal member)
22 Seal member (first seal member)

Claims (6)

A first mold,
A second mold that forms a cavity in contact with the first mold;
The first molding die or the second molding die is inserted into an insertion hole and advances and retreats with respect to the cavity, and a mating surface is provided for both the first molding die and the second molding die. Having a moving core,
A first seal member disposed on a first mating surface where the first mold and the second mold come into contact;
A second seal member disposed on a second mating surface with which the first mold and the moving core abut;
A third seal member disposed on a third mating surface on which the second mold and the movable mold abut,
When the first mold, the second mold, and the moving core are in contact with the first mating surface, the second mating surface, and the third mating surface, respectively, the first seal member And a molding die characterized in that the outer edge portions of the second seal member and the third seal member are arranged to form a closed curve. The first mating surface and the third mating surface are continuous surfaces that respectively contact the first molding die and the moving core of the second molding die, and the first sealing member and the third mating surface 2. The mold according to claim 1, wherein the sealing member is continuously arranged over the first mating surface and the third mating surface of the second molding die. When the first mold and the moving core abut on the second mating surface, the surface of the first mold that abuts on the second mold and the second mold of the moving core A first plane that is continuous with the abutting surface is formed, and a region that abuts the first molding die and a region that abuts the moving core in the second plane of the second molding die that abuts the first plane And one sealing member is disposed continuously, and in the second plane of the second molding die, the region that contacts the first molding die is the first mating surface, and the moving core and The contact area is the third mating surface, and in the seal member disposed on the second plane of the second mold, the portion of the second plane disposed on the first mating surface is the first mating surface. One seal member and the part arranged on the third mating surface is the front Mold according to claim 2, characterized in that it is a third sealing member. The second mating surface and the third mating surface are continuous surfaces that are in contact with the first mold and the second mold of the moving core, respectively, and the second seal member and the third mating surface. The mold according to claim 1, wherein the sealing member is continuously arranged across the second mating surface and the third mating surface of the moving core. The first seal member, the second seal member, and the third seal member, when the first molding die, the second molding die, and the moving core abut each other at their mating surfaces, The molding die according to any one of claims 1 to 4, wherein the molding die is arranged so as to constitute a seal ring by at least two seal members. The first seal member, the second seal member, and the third seal member constitute one complete seal ring by at least two of them, and the remaining one seal member is a seal ring. Is a fragment that is divided in the circumferential direction, and the seal ring is divided when the first mold, the second mold, and the moving core abut each other at their mating surfaces. 6. The mold according to claim 1, wherein both end portions of the mold are arranged so as to overlap different portions of the one complete seal ring, respectively.

Images