JP2012214656A - Molding die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding die capable of smoothly executing air vent in a cavity irrespective of a shape of a formed body, and manufacturing the formed body with excellent transferability.SOLUTION: The molding die 10 is used for forming liquid raw material which is solidified when it is cooled. The molding die includes a first die 20 and a second die 30. By butting the first and second dies to each other on a butting face P, a cavity 40 for forming and a gate 41 to be communicated with the cavity 40 are formed therein. The gate 41 is arranged at a lowest part of the cavity 40, and air vents 70, 71 extending parallel to the butting face P are provided at the position opposite to the gate 41 across the cavity 40, and at the position other than the butting face P.

Description

  The present invention relates to a mold used for molding a liquid raw material that solidifies by cooling.

  The present applicant has previously proposed a soap manufacturing apparatus including a mold having a cavity of a predetermined shape and a supply path of molten soap that leads to the cavity (see, for example, Patent Document 1). According to this mold, it is possible to effectively prevent the molten soap from staying or remaining in the supply path of the mold when filling of the molten soap into the mold is completed.

  In the soap manufacturing method using this mold, as shown in FIG. 10, molten soap is supplied into the cavity 203 from the lower part of the mold 200 formed by assembling the split molds 201 and 202, and directed upward. The molten soap is then filled. The filled molten soap pushes the air in the cavity upward. The pushed-up air is discharged to the outside through an air vent V formed on the split type butting surface P. In this case, if air escape through the air vent V is insufficient, an air pool may occur in the upper portion T of the cavity 203, and the shape of the molded product cannot follow the shape of the cavity due to the air pool. In some cases, it is not possible to obtain a molded product having an appearance excellent in transferability. In particular, when the draft of the molded product at the upper portion T of the cavity 203 is small, air trapping tends to occur more easily. Further, unlike the molten resin, the melted soap has a low viscosity, so there is a problem that the melted soap easily clogs the air vent V.

  By the way, as a technique related to the air vent in the molding die, a technique for easily removing tar adhering to the wall surface of the gas vent hole is proposed in Patent Document 2. In the mold described in the same document, the gas vent insert is incorporated into one of the movable mold and the fixed mold so that the gas vent gap portion faces the cavity, and the mold of the mold incorporating the gas vent insert is incorporated. The opening of the gas vent hole is directly opened on the side surface parallel to the moving direction through the gas vent insert.

JP 2006-089650 A Japanese Patent Application Laid-Open No. 07-040396

  However, the technique described in Patent Document 2 is based on the premise that deposits adhere to the wall surface of the gas vent hole, and is intended to easily remove the deposits. It is not a solution. Moreover, in the shaping | molding die described in the said literature, depending on the position which arrange | positions a gas vent gap part, an air pool may generate | occur | produce and it may be unable to make the external appearance of a molded object excellent.

  Therefore, the subject of this invention is providing the shaping | molding die which can eliminate the fault which the prior art mentioned above has.

The present invention is a mold used for molding a liquid raw material solidified by cooling,
A first die and a second die that are abutted on the abutting surface are formed, and these are abutted on the abutting surface to form a molding cavity and a gate that communicates with the cavity inside. Has been
By providing a molding die in which the gate is disposed at the lowermost part of the cavity and an air vent extending in parallel with the abutting surface is provided at a position opposite to the gate across the cavity and at a position other than the abutting surface. The above-mentioned problem is solved.

  According to the mold of the present invention, the air in the cavity can be successfully removed regardless of the shape of the target molded body, and the molded body can be manufactured with good transferability.

FIG. 1 is a schematic view showing an example of a molded body produced using the molding die of the present invention. FIG. 2 is a longitudinal sectional view of an embodiment of the molding die according to the present invention as seen from a direction parallel to the butting surface in a state where the mold is opened. FIG. 3 is a longitudinal sectional view of an embodiment of the molding die of the present invention as seen from a direction parallel to the butt surface in a state where the die is closed. FIG. 4 is a perspective view showing a main part of a vent block forming a part of the movable mold 20. FIG. 5 is a perspective view showing a main part of a vent block forming a part of the fixed mold 30. FIG. 6 is a view showing a state in which the vent block is looked up from inside the cavity in the closed mold shown in FIG. 3. FIG. 7 is a view showing a draft angle of the die-sculpting portion. FIG. 8 is a diagram showing the positional relationship between the lowest part of the engraved part and the air vent. 9 (a) and 9 (b) are an enlarged schematic view and a sectional view of the main part showing another embodiment of the mold of the present invention, and FIG. 9 (c) is a diagram showing the positional relationship between the vertical hole and the vent pin. It is. FIG. 10 is a longitudinal sectional view showing a conventional mold.

  Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. FIG. 1 shows a perspective view of an example of a molded body molded by the molding die of the present invention. The molded body 100 shown in the figure has a flat, generally cylindrical shape having an upper surface 100A and a lower surface (not shown) that are parallel to each other. The molded body 100 has a maximum diameter at a position of a substantially central portion 100C in the height direction. The diameter gradually decreases from the substantially central portion 100C toward the upper surface 100A and the lower surface (not shown). The molded body 100 can be, for example, soap. When the molded object 100 is soap, the mixture formed by mixing each component as the raw material is heated and dissolved at a predetermined temperature, and the resulting soap is solidified in a mold described below. Therefore, it is preferably manufactured.

  As shown in FIGS. 2 and 3, the mold 10 has a movable mold 20 as a first mold and a fixed mold 30 as a second mold. The movable mold 20 is configured by assembling a plurality of blocks. The fixed mold 30 is the same, and is configured by assembling a plurality of blocks. The movable mold 20 and the fixed mold 30 are configured such that a molding cavity 40 and a gate 41 communicating with the cavity 40 are formed inside when the movable mold 20 and the fixed mold 30 are abutted on the abutting surface P.

  The movable mold 20 configured by assembling a plurality of blocks includes a main block 22 that is directly fixed to the movable platen 21. The main block 22 is integrally formed, and a mold release blow insert 23 is incorporated and arranged in the center of the main block 22. The movable die 20 further includes a runner block 24 that is directly fixed to the main block 22A side located on the gate 41 side, a vent block 25 that is directly fixed to the main block 22B side opposite to the gate 41, and a movable block. A mold release blow insert 23 communicating with a conduit 21 a formed in the platen 21 is provided. By assembling these blocks, the movable die 20 is formed with a die-sculpted portion 26 that is recessed from the butted surface P. The mold release blow insert 23 is provided with a hole that communicates with the conduit 21a and opens on the surface of the die engraved portion 26. By blowing air from the outside of the mold through this hole, the release of the molded body is promoted (the same applies to the release blow insert 33 described later).

  On the other hand, the fixed mold 30 includes a main block 32 that is directly fixed to the fixed platen 31. The main block 32 is formed integrally with the main block 32A side located on the gate 41 side and the main block 32B side located on the opposite side to the gate 41 side. It is built in and arranged in the center. The fixed mold 30 further includes a vent block 35 that is directly fixed to the main block 32B side, and a mold release blow insert 33 that communicates with a conduit 31a formed in the fixed platen 31. The mold release blow insert 33 is provided with a hole that communicates with the conduit 31a and opens on the surface of the mold carved portion 36. By assembling these blocks, the fixed die 30 is formed with a die-carved portion 36 that is recessed from the abutting surface P. The fixed mold 30 includes a sprue bush 34 in addition to these blocks.

  As shown in FIG. 3, in a state where the movable mold 20 and the fixed mold 30 are abutted, the gate 41 is opened at the lowermost part of the cavity 40. The gate 41 communicates with a runner 42 that extends in the vertical direction of the mold 10. The runner 42 communicates with a sprue 43 extending in the lateral direction of the mold 10. Liquid raw material (not shown) such as molten soap is filled into the cavity 40 from the lower part of the cavity 40 upward through the sprue 43, the runner 42 and the gate 41.

  FIG. 4 is a perspective view of a vent block 25 that forms a part of the movable mold 20. The vent block 25 has a first surface 51 and a second surface 52 located on the opposite side of the first surface 51. The first surface 51 and the second surface 52 are parallel to each other. The first surface 51 is a surface that faces the main block 22B side when the vent block 25 is assembled to the movable mold 20. The second surface 52 forms the butting surface P of the movable mold 20 and is a surface facing the fixed mold 30. As described above, since the second surface 52 is parallel to the first surface 51, the first surface 51 is parallel to the butting surface P.

  A shallow first groove 53 extending in the vertical direction of the mold 10 is formed on the first surface 51 of the vent block 25. The first surface 51 is also formed with a second groove 54 that extends in the vertical direction of the mold 10. The same number of second grooves 54 as the first grooves 53 are formed. The second groove portion 54 is deeper than the first groove portion 53. The first groove 53 is open to the cavity 40 at one end in the extending direction. The other end of the first groove portion 53 communicates with the second groove portion 54. On the other hand, one end of the second groove portion 54 communicates with the first groove portion 53, and the other end opens to the outside of the mold 10. In FIG. 4, the three first groove portions 53 have the same width, but need not have the same width. Further, they may be joined together to form one or two long-width grooves. The same applies to the three second groove portions 54, which are all the same width in FIG. 4, but need not be the same width. Further, they may be joined together to form one or two long-width grooves. As described above, the first surface 51 of the vent block 25 is formed with three grooves that extend in the vertical direction of the mold 10 and change in depth along the way.

  The second surface 52 of the vent block 25 is also configured in the same manner as the first surface, and includes a shallow first groove portion (not shown) and a deeper second groove portion 55 than the first groove portion. Is formed. Each first groove portion and each second groove portion 55 communicate with each other, and thereby, on the second surface 52, three groove portions extending in the vertical direction of the mold 10 and changing in depth along the way are formed. The One end of each of these three groove portions opens into the cavity 40, and the other end opens to the outside of the mold 10.

  FIG. 5 is a perspective view of a vent block 35 that forms a part of the fixed mold 30. The vent block 35 has a first surface 61 and a second surface 62 located on the opposite side of the first surface 61. The first surface 61 and the second surface 62 are parallel to each other. The first surface 61 is a surface that faces the main block 32B side when the vent block 35 is assembled to the fixed mold 30. The second surface 62 forms a butting surface P of the fixed mold 30 and is a surface facing the movable mold 20. As described above, since the second surface 62 is parallel to the first surface 61, the first surface 61 is parallel to the abutting surface P.

  A shallow first groove 63 extending in the vertical direction of the mold 10 is formed on the first surface 61 of the vent block 35. The first surface 61 is also formed with a second groove 64 that extends in the vertical direction of the mold 10. The same number of second grooves 64 as the first grooves 63 are formed. The second groove part 64 is deeper than the first groove part 63. One end of the first groove 63 in the extending direction opens into the cavity 40. The other end of the first groove 63 communicates with the second groove 64. On the other hand, the second groove portion 64 has one end communicating with the first groove portion 63 and the other end opened to the outside of the mold 10. In FIG. 5, the three first groove portions 63 have the same width, but need not have the same width. Further, they may be joined together to form one or two long-width grooves. The same applies to the three second groove portions 64, and all of them have the same width in FIG. Further, they may be joined together to form one or two long-width grooves. As described above, the first surface 61 of the vent block 35 is formed with three grooves that extend in the vertical direction of the mold 10 and change in depth along the way. Unlike the 1st surface 61, the 2nd surface 62 of the vent block 35 is a plane, and the groove part is not formed.

  FIG. 6 shows a state in which the vent blocks 25 and 35 are looked up from inside the cavity 40 in the mold 10 in the closed state shown in FIG. 3. In the movable mold 20, the main block 22 </ b> B side and the vent block 25 are assembled, so that a slit shape derived from the first groove portion 53 and the second groove portion 54 (see FIG. 4) on the contact surface thereof. A movable air vent 70 is formed. Three movable air vents 70 are formed, one end of which opens to the cavity 40 and the other end opens to the outside of the mold 10. That is, the movable air vent 70 communicates the cavity 40 and the outside of the mold 10 in the mold 10.

  Still referring to FIG. 6, in the fixed mold 30, the main block 32 </ b> B side and the vent block 35 are assembled, so that the first groove portion 63 and the second groove portion 64 (see FIG. 5) on their contact surfaces. ) Derived slit-shaped fixed-side air vent 71 is formed. Three fixed-side air vents 71 are formed, one end of which opens to the cavity 40 and the other end opens to the outside of the mold 10. That is, the fixed-side air vent 71 communicates the cavity 40 and the outside of the forming die 10 in the forming die 10 in the same manner as the movable air vent 70 described above.

  Further, as shown in FIG. 6, the movable die 20 and the fixed die 30 are abutted on the abutting surface P so that the second surface 52 of the vent block 25 of the movable die 20 and the vent block of the fixed die 30 are obtained. The central air vent 72 having a slit shape derived from the first groove portion and the second groove portion 55 (see FIG. 4) formed on the second surface 52 of the vent block 25 in contact with the second surface 62 of the vent block 25. Is formed. The central air vent 72 communicates the cavity 40 and the outside of the molding die 10 in the molding die 10 in the same manner as the movable air vent 70 and the stationary air vent 71 described above.

  As apparent from FIG. 6 and FIG. 3 described above, in the molding die 10 of the present embodiment, the gate 41 is disposed at the lowermost portion of the cavity 40, and the position on the opposite side of the gate 41 across the cavity 40. In addition, a movable-side air vent 70 and a fixed-side air vent 71 extending in parallel with the abutting surface P are provided at positions other than the abutting surface P. In addition to these movable air vents 70 and 71, a central air vent 72 is also provided at the position of the butting surface P. The cavity open ends 70a and 71a in the movable side air vent 70 and the fixed side air vent 71 are positioned lower than the cavity open end 72a in the central air vent 72 (see FIG. 3).

  By forming the molding die 10 in this way, when the liquid raw material is molded using the molding die 10, the liquid surface of the liquid raw material filled in the cavity 40 through the gate 41 gradually rises accordingly. Air in the cavity 40 is pushed out of the mold through each air vent. When the inside of the cavity 40 is nearly full, an air pool is likely to be generated in the upper portion of the cavity 40. In the mold 10 of this embodiment, not only the central air vent 72 but also the movable air vent 70 and the fixed air vent 71 are provided. Therefore, the air venting is successfully performed by the action of both the air vents 70 and 71, and the occurrence of air pockets can be effectively prevented. As a result, a molded body having a shape in which the shape of the cavity 40 is accurately transferred can be manufactured. Further, the air vents 70, 71, 72 are not easily clogged.

  The air reservoir described above is in a state in which at least one of the engraving portion 26 of the movable die 20 and the engraving portion 36 of the fixed die 30 is viewed in parallel with the abutment surface P of FIG. As shown in FIG. 5, this tends to occur when the draft angle θ at a position opposite to the gate 41 across the cavity 40 is 12 degrees or less, particularly 8 degrees or less. However, according to the molding die 10 of the present embodiment having the movable air vent 70 and the fixed air vent 71 described above, the occurrence of air pockets can be effectively prevented even if such a shaped engraved portion is formed. can do.

  From the viewpoint of more effectively preventing the occurrence of air accumulation due to the filling of the liquid raw material into the cavity 40, the forming position of at least one of the air vent 70 and the air vent 71 is parallel to the butting surface P of the mold 10. 8, as shown in FIG. 8, it is located at the same position as the bottommost portions 26 a, 36 a with respect to the bottommost portions 26 a, 36 a of the die-sculpted portion, or from the bottommost portions 26 a, 36 a It is preferably within 1/2 of D1 and D2. If the movable side air vent 70 and the fixed side air vent 71 are formed at such positions, the air that has not been able to escape from the cavity 40 in the final filling state of the liquid raw material is more easily pushed out from the air vent 70 and the air vent 71. It becomes difficult to generate air pockets.

  The clearances of the air vent 70 and the air vent 71 are preferably 10 to 100 μm, particularly 30 to 70 μm, from the viewpoint of preventing the occurrence of air accumulation and preventing the air vents 70 and 71 from clogging. The same applies to the clearance of the central air vent 72. The clearances of these air vents 70, 71, 72 may be the same or different.

  As shown in FIGS. 2 and 3, the movable air vent 70 communicates with a conduit 22 a formed in the main block 22 of the movable mold 20. Similarly, the fixed-side air vent 71 communicates with a conduit 32 a formed in the main block 32 of the fixed mold 30. Each conduit 22a, 32a is in communication with a high pressure air source (not shown). By sending air from the high-pressure air source to the respective conduits 22a and 32a, the movable air vent 70 and the fixed air vent 71 can be blown through the conduits 22a and 32a. By this air blow, the unintentionally accumulated molten soap or the solidified product in these air vents 70 and 71 can be discharged out of the mold. Thereby, clogging of the air vents 70 and 71 can be effectively prevented. It is effective to perform the air blow when the mold 10 is opened.

  9A to 9C show another embodiment of the mold according to the present invention. In the molding die 10 shown in the figure, a vertical hole 44 that is open on the top surfaces of the movable die 20 and the fixed die 30 and hangs down to the cavity 40 is formed. The lower end of the vertical hole 44 opens and communicates with the cavity 40. The opening at the lower end of the vertical hole 44 is located at a position 44a farthest from the abutting surface P of the periphery of the opening when the mold 10 is viewed in parallel with the abutting surface P. It is formed so as to be located at the same position as 36a or closer to the butting surface P than the lowest part. In FIG. 9, only the fixed mold 30 side is shown, but the movable mold 20 may have the same configuration. The cross section of the vertical hole 44 is circular. A cylindrical vent pin 45 having a diameter substantially the same as the diameter of the vertical hole 44 can be inserted into the vertical hole 44.

  As shown in FIG. 9C, the vent pin 45 has two chamfered portions 45a and 45b on its side surface. The chamfered portions 45a and 45b are portions where the vent pin 45 is chamfered in a planar shape along the axis thereof. Therefore, the chamfered portions 45 a and 45 b are flat and extend in the axial direction of the vent pin 45. The two chamfered portions 45a and 45b are parallel to each other.

  The vent pin 45 is inserted into the vertical hole 44 so that the chamfered portions 45 a and 45 b are parallel to the butted surface P. In a state in which the vent pin 45 is inserted into the vertical hole 44 with such directionality, two air vents 46a and 46b are provided between the chamfered portions 45a and 45b and the wall surface of the vertical hole 44 as shown in FIG. Is formed. The air vents 46a and 46b extend in parallel with the butted surfaces. As in the previous embodiment, the air vents 46a and 46b are formed at a position where the bottom 10a is formed with reference to the bottom 36a of the die-sculpted portion when the molding die 10 is viewed in parallel with the butting surface P. It is preferable that it is in the same position as or within the half of the die-cutting depth from the lowest part 36a.

  In the mold 10 of this embodiment, a central air vent 47 extending in parallel with the abutting surface P may be formed at the position of the abutting surface P.

  According to the mold 10 of the present embodiment, the same effects as the mold of the embodiment described above are exhibited. Moreover, according to the shaping | molding die 10 of this embodiment, the advantageous effect which is not show | played by the shaping | molding die of previous embodiment that the processing man-hour when manufacturing the shaping | molding die 10 can be reduced is also show | played.

  The material of the vent block and the vent pin used in each of the above embodiments is stainless steel, a metal surface coated with a ceramic film such as chromium nitride by the PVD method, and a metal surface coated with nickel or chromium by the plating method. And the like. Since these materials have high corrosion resistance, they are effective when the liquid raw material used as a raw material for molding is, for example, corrosive. Examples of the liquid raw material having such corrosive properties include a molten soap described later.

  Examples of the liquid raw material molded by the mold of the present invention include various thermoplastic resin melts and soaps. In particular, molten soap has a lower viscosity than a thermoplastic resin melt and tends to clog air vents, but such clogging is less likely to occur by using the mold of the present invention.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the above-described embodiment, the air vent is formed on both the movable mold and the fixed mold. However, depending on the shape of the engraved portion, the air vent may be formed only on one of the movable mold and the fixed mold. .

  Moreover, in the said embodiment, although the movable mold | type 20 was used as a 1st type | mold in a shaping | molding die, and the fixed mold | type 30 was used as a 2nd type | mold, it replaces with this as a 1st type | mold and a 2nd type | mold. In either case, a movable type may be used.

  2 and 3, the three movable-side air vents 70 are formed. However, the number is not limited to this, and one or two according to the shape of the molded body. Or four or more may be sufficient. The same applies to the fixed-side air vent 71 and the central air vent 72.

DESCRIPTION OF SYMBOLS 10 Mold 20 Movable mold 30 Fixed mold 40 Cavity 41 Gate 70 Movable air vent 71 Fixed air vent 72 Central air vent

Claims (8)

A mold used for molding a liquid raw material that solidifies by cooling,
A first die and a second die that are abutted on the abutting surface are formed, and these are abutted on the abutting surface to form a molding cavity and a gate that communicates with the cavity inside. Has been
A molding die in which a gate is disposed at the lowermost part of the cavity, and an air vent extending parallel to the abutting surface is provided at a position opposite to the gate with the cavity interposed therebetween and at a position other than the abutting surface.   2. The mold according to claim 1, wherein the formation position of the air vent is within ½ of the mold carving depth with reference to the bottom of the mold carved portion in a state where the mold is viewed in parallel with the butted surface.   The mold according to claim 1 or 2, wherein the air vent communicates with a high pressure air source for air blowing the air vent.   The mold according to claim 1, wherein the air vent has a clearance of 10 to 100 μm.   The mold according to any one of claims 1 to 4, further comprising an air vent extending in parallel with the abutting surface at a position of the abutting surface.   At least one of the first mold and the second mold has a draft angle θ of 12 degrees or less at a position opposite to the gate across the cavity with the mold viewed in parallel with the abutting surface. The mold according to any one of claims 1 to 5, which has a shape of   The mold according to claim 6, wherein the position of the cavity opening end in the air vent provided at a position other than the abutting surface is lower than the position of the cavity opening end in the air vent provided at the position of the abutting surface.   The mold according to any one of claims 1 to 7, wherein the liquid raw material is a molten soap, and is used for forming a solid soap by cooling the molten soap.

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