JP2014088009A - Insert and method of producing insert - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique which enables easy formation of an insulating layer, independent of the shape of a cavity surface, in an insulating mold and alleviates complication of maintenance of an insulating mold.SOLUTION: An insert is to be arranged in a mold and comprises an insert body and an insulating layer arranged in at least a part of the insert body and constituting a part of a cavity surface. The insulating layer is preferably embedded in a concave part formed in the insert body. The insert is obtained by a production method including an insulation layer formation step of forming an insulating layer on a block body made of an insert material constituting the insert to obtain a composite body consisting of the block body and the insulating layer and a removal step of removing a part of the block body and a part of the insulating layer.

Description

  The present invention relates to a nest in which a heat insulating layer is formed, and a method for manufacturing the nest.

  Thermoplastic resins are lighter than other materials such as metal, and are easy to be molded into a desired shape by an injection molding method, etc., so electrical and electronic parts used in automobiles, office equipment, food and It is used in various fields such as beverage containers.

  When a mold is filled with a thermoplastic resin in a molten state to obtain a resin molded body having a desired shape as in the injection molding method, a pattern or shape imparted to the resin molded body is formed on the cavity surface of the mold. Is formed.

  In order to improve the transferability of the shape and pattern of the cavity surface to the resin molding, the thermoplastic resin is improved, a specific additive is added to the thermoplastic resin, or the mold temperature is increased. The method is known.

  In particular, the method for increasing the mold temperature is effective in that no material improvement is required. However, when the mold temperature is raised, the time required for cooling and solidifying the plasticized thermoplastic resin becomes longer, and generally the molding efficiency is lowered.

  Therefore, there is a disclosure in Patent Document 1 or the like regarding a mold in which an inner wall surface of a mold is covered with a heat insulating layer having a low thermal conductivity, that is, a heat insulating mold.

  The heat insulating mold described in the above-mentioned Patent Document 1 is also suitable for cases where it is necessary to increase the mold temperature (for example, improvement of moldability) in addition to the above improvement of transferability.

Japanese Patent Application Laid-Open No. 09-155876

  By the way, the heat insulation layer in a heat insulation metal mold | die may produce problems, such as a damage and peeling, at the time of use. In such a case, even if a part where damage or peeling occurs is a part, the entire movable mold and / or fixed mold in the heat insulating mold must be taken out and repaired. Maintenance is likely to be complicated. Further, in a heat insulating mold, the heat insulating layer is formed so as to constitute a cavity surface of various shapes, and may be formed so as to constitute a complex cavity surface or a cavity surface requiring high dimensional accuracy. . In general, in a heat insulating mold, the heat insulating layer is formed by a method such as thermal spraying of a material constituting the heat insulating layer or application and heating of a precursor of the above material, but depending on the shape of the cavity surface, the heat insulating layer may be formed. It may be difficult to do.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to make it possible to easily form a heat insulating layer regardless of the shape of the cavity surface in the heat insulating mold. It is to provide a technique for reducing the complexity of maintenance.

  The inventors of the present invention have made extensive studies to solve the above problems. As a result, the present inventors have found that the above problems can be solved by a nesting provided with at least a part of the nesting body and including a heat insulating layer that constitutes a part of the cavity surface, and completed the present invention. More specifically, the present invention provides the following.

  (1) A nesting disposed in a mold, the nesting comprising a nesting body and a heat insulating layer provided on at least a part of the nesting body and constituting a part of a cavity surface.

  (2) The said heat insulation layer is a nest | insert as described in (1) embed | buried under the recessed part provided in the said nest | insert main body.

  (3) The nesting according to (2), wherein the surface of the nesting body exists on the same surface as the surface around the entire periphery of the surface of the heat insulating layer.

  (4) The nesting according to (3), wherein the width of the surface of the nesting body existing around the entire circumference of the surface of the heat insulating layer is 0.1 mm or more.

  (5) The nesting according to any one of (2) to (4), wherein the recess has an inclined surface formed from an opening edge of the recess toward the center of the bottom of the recess.

  (6) The concave portion includes a vertical surface extending from the opening edge toward the bottom side of the concave portion perpendicular to a surface formed by the opening edge of the concave portion, and the opening edge as an upper end of the vertical surface. The nesting according to any one of (2) to (4), which has an inclined surface formed from the lower end of the vertical surface toward the center of the bottom of the recess.

  (7) The method for manufacturing a nest according to (1), wherein a heat insulating layer is formed on a block body made of a nested material constituting the nest, and the composite body includes the block body and the heat insulating layer. And a removing step of removing a part of the block body or a part of the block body and a part of the heat insulating layer from the composite.

  (8) The nesting is the nesting according to any one of (2) to (6), and the heat insulating layer forming step is made of a nesting material constituting the nesting, and on a block body having a recess on the surface. The manufacturing method according to (7), which is a step of forming a heat insulating layer, filling at least the concave portion with the heat insulating layer, and obtaining a composite including the block body and the heat insulating layer.

  According to the present invention, in the heat insulating mold, the heat insulating layer can be easily formed regardless of the shape of the cavity surface, and the troublesomeness in the maintenance of the heat insulating mold can be reduced.

FIG. 1 is a diagram schematically showing the insert 1 of the first embodiment, (a) is a perspective view, (b) is a sectional view showing a MM section of (a), and (c) is a sectional view. It is sectional drawing which shows the NN cross section of (a). FIG. 2 is a cross-sectional view showing a usage state of the insert 1 of the first embodiment. FIG. 3 is a perspective view showing a molded body 5 which is an example of a molded body molded by the mold 10 in which the insert 1 of the first embodiment is arranged. FIG. 4 is a cross-sectional view schematically showing an example of a method for manufacturing the insert 1 according to the first embodiment. FIG. 5 is a view schematically showing the insert 1A of the second embodiment, (a) is a perspective view, (b) is a cross-sectional view showing an OO cross section of (a), and (c) is a cross-sectional view. It is sectional drawing which shows PP cross section of (a). FIG. 6 is an enlarged view showing dimensions around the heat insulating layer 3 in the insert 1A of the second embodiment shown in FIG. FIG. 7 is a view schematically showing the insert 1B of the third embodiment, (a) is a perspective view, (b) is a cross-sectional view showing a QQ cross section of (a), and (c) is a cross-sectional view. It is sectional drawing which shows the RR cross section of (a). FIG. 8 is a cross-sectional view showing a usage state of the insert 1B of the third embodiment. FIG. 9 is a cross-sectional view schematically showing an example of a method for manufacturing the insert 1B of the third embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following embodiment.

≪First embodiment≫
<Nested>
FIG. 1 is a diagram schematically showing the insert 1 of the first embodiment, (a) is a perspective view, (b) is a sectional view showing a MM section of (a), and (c) is a sectional view. It is sectional drawing which shows the NN cross section of (a).

  As shown in FIG. 1, the nesting 1 of the present embodiment includes a nesting body 2 and a heat insulating layer 3. As will be described later, the heat insulating layer 3 constitutes a part of the cavity surface in the mold in which the insert 1 is disposed. The insert 1 has a hole on the side surface of the insert body 2 through which the protruding pin passes. The cavity refers to the entire space filled with the resin inside the mold.

  At the time of molding the resin molded body, the mold cavity is filled with molten resin. The heat which the molten resin which contacts the surface of the heat insulation layer 3 becomes difficult to be discharged | emitted out of a metal mold | die by the heat insulation effect. As a result, the fluidity of the molten resin is easily maintained at the portion in contact with the surface of the heat insulating layer 3, and weld adhesion is improved.

  As shown in FIGS. 1B and 1C, the heat insulating layer 3 is embedded in a recess provided in the nested body 2. Thereby, compared with the case where only the heat insulation layer is simply laminated on the surface of the nesting body, the heat insulation layer 3 is less exposed to the outside of the nesting 1 and, in particular, there is no corner portion made of the heat insulation layer 3, When the insert 1 is attached to the mold or removed from the mold, the heat insulating layer 3 is less likely to come into contact with other members, and problems such as lack of the heat insulating layer 3 are easily suppressed. In addition, the contact area between the nesting body 2 and the heat insulating layer 3 is increased compared to the case where the heat insulating layer is simply laminated on the surface of the nesting body, and the heat insulating layer 3 improves the adhesion to the nesting body 2. Even after the molding and release are repeated many times, problems such as peeling are less likely to occur.

  As shown in FIGS. 1B and 1C, the surface β of the nesting body 2 exists on the same surface as the surface α around the entire surface α of the heat insulating layer 3. Thereby, since the heat insulation layer 3 is protected by the surface (beta) of the nest | insert main body 2, generation | occurrence | production of problems, such as a lack of the heat insulation layer 3, becomes still easier to be suppressed.

  The width d of the surface β of the nested body 2 existing on the same surface as the surface α of the heat insulating layer 3 is preferably 0.1 mm or more. When the width d is 0.1 mm or more, the protective effect of the heat insulating layer 3 by the surface β of the nesting body 2 is further improved. On the other hand, if the width d is too large, the region where the heat insulating layer 3 is present becomes small on the cavity surface composed of the surface α and the surface β, so that the heat insulating effect is difficult to improve and uniform. d is preferably 0.5 mm or less.

  As shown in FIGS. 1B and 1C, the concave portion provided in the nesting body 2 is a region having a concave outer shape formed by the inclined surface γ and the bottom surface δ. Here, the concave shape may be a depression, and the shape inside the depression is not particularly limited. Accordingly, the concave shape includes a shape recessed in a bowl shape and a shape recessed in a V shape in addition to the shape recessed in a trapezoidal shape as illustrated. The surface α of the heat insulating layer 3 constitutes a part of the cavity surface, and when the heat insulating layer 3 is formed, the shape of the surface α of the heat insulating layer 3 is a part of the shape to be imparted to a desired molded body. It is preferable to keep it.

  In the recess provided in the nesting body 2, the inclined surface γ is an inclined surface formed from the opening edge of the recess toward the center of the bottom surface δ corresponding to the bottom of the recess. The opening edge coincides with the boundary between the surface α and the surface β. Further, the bottom surface δ is parallel to the plane formed by the opening edge.

  The outer angle θ formed by the inclined surface γ and the bottom surface δ is preferably 45 ° or less. When the outer angle θ is 45 ° or less, it becomes easy to form the heat insulating layer 3 by a thermal spraying method.

  The thickness of the heat insulation layer 3 is not particularly limited, and is appropriately determined in consideration of the heat insulation effect of the material constituting the heat insulation layer 3 and the like. Moreover, the thickness of the heat insulation layer 3 may not be constant.

  Although the heat conductivity calculated | required by the heat insulation layer 3 changes with uses etc., it is especially preferable that it is 2 W / m * K or less.

  Although the material which comprises the heat insulation layer 3 is not specifically limited, What is necessary is just to have heat resistance of the grade which has a low heat conductivity and does not produce a malfunction even if it contacts a high temperature resin composition.

  Examples of the material that satisfies the heat resistance and thermal conductivity required for the heat insulating layer 3 include resins having high heat resistance such as polyimide resin and low thermal conductivity, and porous ceramics such as porous zirconia. Hereinafter, these materials will be described.

  Specific examples of the polyimide resin include pyromellitic acid (PMDA) -based polyimide, biphenyltetracarboxylic acid-based polyimide, polyamideimide using trimellitic acid, bismaleimide-based resin (bismaleimide / triazine-based, etc.), benzophenone tetracarboxylic acid Based polyimide, acetylene-terminated polyimide, thermoplastic polyimide, and the like. In addition, it is especially preferable that it is a heat insulation layer comprised from a polyimide resin. Preferable materials other than polyimide resin include, for example, tetrafluoroethylene resin. Further, the heat insulating layer may contain a resin other than polyimide resin and tetrafluoroethylene resin, additives, and the like as long as the effects of the present invention are not impaired.

  The zirconia contained in the porous zirconia is not particularly limited, and may be any of stabilized zirconia, partially stabilized zirconia, and unstabilized zirconia. Stabilized zirconia is one in which cubic zirconia is stabilized even at room temperature, and is excellent in mechanical properties such as strength and toughness and wear resistance. Partially stabilized zirconia refers to a state in which tetragonal zirconia partially remains even at room temperature, and when subjected to external stress, a martensitic transformation from tetragonal to monoclinic crystal occurs, and is particularly advanced by the action of tensile stress. Suppresses crack growth and has high fracture toughness. Unstabilized zirconia refers to zirconia that is not stabilized by a stabilizer. In addition, you may use combining at least 2 or more types selected from stabilized zirconia, partially stabilized zirconia, and unstabilized zirconia.

  A conventionally well-known general thing can be employ | adopted as a stabilizer contained in stabilized zirconia and partially stabilized zirconia. For example, yttria, ceria, magnesia and the like can be mentioned. The amount of the stabilizer used is not particularly limited, and the amount used can be appropriately set according to the application, the material used, and the like.

  In addition, porous ceramics other than porous zirconia can be used, but porous zirconia has higher durability than other porous ceramics. For this reason, if the metal mold | die which formed the heat insulation layer 3 comprised from porous zirconia is used, since malfunctions, such as a deformation | transformation of the heat insulation layer 3, do not arise easily, there are many numbers of the molded objects which can be shape | molded continuously, Productivity is greatly increased.

  The raw material for forming the heat insulation layer 3 may further contain conventionally known additives in addition to the above-mentioned zirconia and stabilizer, as long as the effects of the present invention are not impaired.

  FIG. 2 is a cross-sectional view showing a usage state of the insert 1 of the first embodiment. The insert 1 is used by being placed in a mold 10. The mold 10 includes a movable mold 20 and a fixed mold 30. The movable mold 20 includes a movable mold body 21, and a nesting 1, a nesting 22, and a nesting 23 attached to the movable mold body 21. The cavity 4 is formed by assembling the mold 10 from the movable mold 20 and the fixed mold 30. The cavity surface of the cavity 4 is constituted by the insert 1, the insert 22, the insert 23, and the fixed mold 30. The insert 1 appropriately has a hole (not shown) through which the protruding pin passes.

  A molded body can be molded by filling the cavity 4 formed in the mold 10 with a molten resin and solidifying it. FIG. 3 is a perspective view showing a molded body 5 which is an example of a molded body molded by the mold 10 in which the insert 1 of the first embodiment is arranged.

The molded body 5 has a box shape without an upper surface, and includes a side surface and a bottom surface. Although the size of the molded body 5 is not particularly limited, the insert 1 can be suitably used particularly for molding the molded body 5 having a small size. As the compact 5 having such a small size, for example, the volume of the entire space occupied by the compact (width x depth x height of the compact 5 including the volume of the cavity) is from 0.1 mm ³ order. Examples thereof include a molded body having an order of 100 mm ³ (for example, 0.1 mm ³ or more and less than 1000 mm ³ ). In such a molded body, examples of the thickness of the side surface and the bottom surface include a thickness of the order of 0.01 mm to 1 mm (for example, a thickness of 0.01 mm or more and less than 10 mm).

  In addition, the molded object obtained using the nest | insert 1 is not limited to the molded object 5, By changing the shape of the nest | insert 1 suitably, the molded object of various shapes can be shape | molded. By using the insert 1, for example, a small-sized molded body such as a board-to-board connector (B to B connector) can be easily molded.

<Nested manufacturing method>
FIG. 4 is a cross-sectional view schematically showing an example of a method for manufacturing the insert 1 according to the first embodiment. The manufacturing method includes a heat insulating layer forming step and a removing step.

  The heat insulation layer forming step is a step of changing the states of FIGS. 4A1 and 4A2 to the states of FIGS. 4B1 and 4B2 respectively. In the heat insulating layer forming step, the heat insulating layer 3 is formed on the block body 6 having a concave portion on the surface, which is made of a nesting material constituting the insert 1, and at least the concave portion is filled with the heat insulating layer 3. In this step, a composite 7 including the heat insulating layer 3 is obtained. As a recessed part provided in the surface of the block body 6, what has the same shape as the recessed part provided in the nest | insert main body 2 is mentioned, for example. In addition, as a nesting material, the die steel materials etc. which are normally used for manufacture of a nesting are mentioned, for example, The block body 6 can be manufactured with a conventionally well-known casting method etc.

  The formation method of the heat insulation layer 3 is not specifically limited, A suitable method can be suitably employ | adopted according to the kind etc. of the material which comprises the heat insulation layer 3. FIG. Hereinafter, a method for forming the heat insulating layer 3 will be described with specific examples.

  When the material constituting the heat insulating layer 3 is a resin having a high heat resistance such as a polyimide resin and a low thermal conductivity, a solution of a polymer precursor such as a polyimide precursor capable of forming a polymer heat insulating layer is used as a block body. 6, a method of forming a heat insulating layer 3 such as a polyimide film by heating to evaporate the solvent and further heating to polymerize, a monomer of a heat resistant polymer, For example, with respect to a method of vapor deposition polymerization of pyromellitic anhydride and 4,4-diaminodiphenyl ether, or a planar mold, an appropriate adhesion method or a pressure-sensitive adhesive tape-like polymer heat insulating film is used. The method of sticking a polymer heat insulation film on the wall surface of the recessed part provided in the surface and forming the heat insulation layer 3 is mentioned. It is also possible to form a polyimide film and further form a chromium (Cr) film or a titanium nitride (TiN) film as a metal-based hard film on the surface thereof.

  Moreover, when the material which comprises the heat insulation layer 3 is porous ceramics, such as porous zirconia, it is preferable to employ | adopt a thermal spraying method. By adopting the thermal spraying method, the thermal conductivity of porous zirconia or the like is easily adjusted to a desired range. Moreover, problems such as a significant decrease in the mechanical strength of the heat insulating layer 3 due to excessive formation of bubbles inside porous zirconia or the like do not occur. Thus, by forming the heat insulation layer 3 by thermal spraying, the structure of the heat insulation layer 3 becomes suitable for the use of the present invention.

  Formation of the heat insulation layer 3 by thermal spraying can be performed as follows, for example. First, the raw material is melted to form a liquid. This liquid is accelerated to collide with the wall surface of the recess provided on the surface of the block body 6. Finally, the material that collides and adheres is solidified. By doing in this way, the very thin heat insulation layer 3 is formed. The thickness of the heat insulation layer 3 can be adjusted by making the melted raw material collide and solidify on the very thin heat insulation layer 3. As a method for solidifying the raw material, a conventionally known cooling means may be used, or the raw material may be solidified simply by leaving it to stand. The thermal spraying method is not particularly limited, and a preferable method can be appropriately selected from conventionally known methods such as arc spraying, plasma spraying, and flame spraying.

  When the heat insulating layer 3 is formed by thermal spraying, if a porous ceramic such as porous zirconia is sprayed directly on the block body 6 made of a mold steel material or the like, the linear expansion coefficient is reduced between the block body 6 and the porous ceramic. Since the difference is large, the heat insulating layer 3 may be peeled off from the nest 1 when the obtained nest 1 is used. In order to prevent this, in order to improve the adhesion between the block body 6 and the porous ceramic, a material (Ni-Al) whose linear expansion coefficient is intermediate between the block body 6 and the porous ceramic prior to thermal spraying. An undercoat layer may be formed. Here, in order to improve the adhesion between the block body 6 and the undercoat layer, a blast treatment may be performed on the concave portion provided on the surface of the block body 6. Specifically, for example, it can be processed by the method described in JP-A No. 2003-193216.

  In addition, when forming the heat insulation layer 3 by a thermal spraying method, since formation becomes easy, in the block body 6 shown in FIG. 4, the inclined surface and bottom face which the recessed part provided in the surface of the block body 6 has Is preferably 45 ° or less.

  The removing step is a step of changing the states of FIGS. 4B1 and 4B2 to the states of FIGS. 4C1 and 4C2, respectively. As shown in FIG. 4, in the removal step, a part of the block body 6 is removed in the width direction and depth direction of the block body 6, and the heat insulation layer 3 is removed in the thickness direction, width direction, and depth direction of the heat insulation layer 3. Remove some. In this step, the block body 6 and the heat insulating layer 3 are removed until reaching the position indicated by the dotted line in FIG. 4 (b1) and FIG. 4 (b2). The shape indicated by the dotted line is the same as the outer shape of the nest 1 shown in FIGS. 4 (c1) and 4 (c2). In particular, the heat insulation layer 3 is removed in the thickness direction until the position of the upper surface of the block body 6 is reached.

  The method of removing the block body 6 and the heat insulating layer 3 is not particularly limited, but gradually, by a method of manually polishing, or a method of polishing by lapping (mechanical polishing) if the surface to be polished is flat. It is preferable to remove it so as to remove it. For example, a diamond grindstone can be used for the manual polishing method. For mechanical polishing, for example, diamond abrasive grains or diamond paste in which diamond abrasive grains are dispersed in a dispersion medium can be used.

<Effect>
The nesting and the manufacturing method of the nesting of this embodiment have the following effects.
When using a nest with a heat insulation layer formed, the heat insulation layer may be missing when the heat insulation layer comes into contact with other members when the nest is attached to or removed from the nest. May occur. In addition, a force is applied to the heat insulating layer when a molded body made of a resin contracted at the time of molding is ejected, and there is a possibility that the heat insulating layer peels off as molding and mold release are repeated.
In the nesting of this embodiment, as shown in FIGS. 1B and 1C, the heat insulating layer 3 is embedded in a recess provided in the nesting body 2, and further, the entire periphery of the surface α of the heat insulating layer 3. The surface β of the nesting body 2 exists on the same plane as the surface α. Thereby, the heat insulation layer 3 does not easily cause a problem that the heat insulation layer 3 is chipped or peeled off. Thus, by using the insert 1, in the heat insulating mold in which the insert 1 is disposed, the heat insulating layer is easily configured, and as described above, the heat insulating layer 3 is not easily chipped or peeled off. Mold maintenance is less complicated.

  In the molded body 5 shown in FIG. 3, when the thickness of the bottom surface is thinner than the thickness of the side surface and / or the area of the bottom surface is wider than the area of the side surface, when the insert 1 is not used, the molten resin flows on the bottom surface. It becomes difficult and filling is delayed. However, when the insert 1 is used, since the bottom surface of the molded body 5 is formed in contact with the heat insulating layer 3, the fluidity of the molten resin is easily maintained on the bottom surface, and the weld adhesion is improved. Is improved.

When the size of the insert 1 is small, if the heat insulating layer 3 is formed by the thermal spraying method after the shape of the insert main body 2 is formed, the thermal spraying area is small, so overheating due to thermal spraying may occur and the insert main body 2 may be deformed. There is. When the scanning speed of spraying is increased so as not to overheat, the sprayed surface becomes rough and the surface state of the heat insulating layer 3 is unlikely to be good. In the nested manufacturing method according to the present embodiment, first, spraying is performed on the block body 6 having a larger size, so that it is difficult to overheat even if the scanning speed of spraying is normal. Further, since spraying can be performed at a normal scanning speed, the sprayed surface is unlikely to become rough. By processing into a desired shape after thermal spraying, the insert 1 having the heat insulating layer 3 with a good surface state can be easily obtained. The lower limit of the area of the sprayed surface is preferably 100 mm ² and the lower limit of the volume of the insert 1 is preferably 5000 mm ³ . When the volume of the insert 1 is 5000 mm ³ or more, overheating at the time of thermal spraying hardly occurs, and deformation of the insert body 2 can be effectively suppressed.

  Further, when the size of the insert 1 is small, when the heat insulating layer 3 is formed by the thermal spraying method after the shape of the insert main body 2 is formed, the recesses provided in the insert main body 2 are underlined before the heat insulating layer 3 is formed. If a blast process is performed on the recess to form the coat layer, the position of the thin portion surrounding the recess may be displaced, and the recess may be deformed. In the nested manufacturing method of the present embodiment, first, the blast process is performed on the block body 6 having a larger size, so that deformation of the concave portion can be easily prevented. In order to effectively prevent the deformation of the concave portion due to the blast treatment, it is preferable to leave a room of 0.5 mm or more around the spraying range.

<< Second Embodiment >>
<Nested>
FIG. 5 is a view schematically showing the insert 1A of the second embodiment, (a) is a perspective view, (b) is a cross-sectional view showing an OO cross section of (a), and (c) is a cross-sectional view. It is sectional drawing which shows PP cross section of (a). In the second embodiment, differences from the first embodiment will be mainly described. In the second embodiment, the same or equivalent configuration as in the first embodiment will be described with the same reference numerals. Moreover, in 2nd embodiment, the description which overlaps with 1st embodiment is abbreviate | omitted suitably.

  As shown in FIG. 5, the nesting 1 </ b> A of this embodiment includes a nesting body 2 </ b> A and a heat insulating layer 3. That is, the insert 1A of the present embodiment is different from the insert 1 of the first embodiment in that the recess provided in the insert body 2A has not only the inclined surface γ and the bottom surface δ but also the vertical surface ε. The insert 1A has a hole on the side surface of the insert body 2A through which the protruding pin passes.

  As shown in FIGS. 5B and 5C, the concave portion provided in the nesting body 2A is a region having a concave outer shape formed by the inclined surface γ, the bottom surface δ, and the vertical surface ε. In the recess provided in the nesting body 2A, the vertical surface ε is a vertical surface extending from the opening edge toward the bottom of the recess perpendicular to the surface formed by the opening edge of the recess. In addition, in the recess provided in the nesting body 2A, the inclined surface γ is an inclined surface formed from the lower end of the vertical surface ε toward the bottom center of the recess when the opening edge is the upper end of the vertical surface ε. It is.

FIG. 6 is an enlarged view showing dimensions around the heat insulating layer 3 in the insert 1A of the second embodiment shown in FIG. Since it becomes easy to form the heat insulating layer 3 by the thermal spraying method, in FIG. 6, the dimension W in the width direction of the surface α of the heat insulating layer 3 and the dimension d ₁ in the height direction of the vertical plane ε W / 2 ≧ d ₁ is preferably satisfied, and the projection dimension d _{2 of} the inclined surface γ in the height direction and the projection dimension w _{1 of} the inclined surface γ in the bottom surface δ direction are d _2. It is preferable that ≦ w ₁ is satisfied.

  The nesting 1A of the second embodiment can be used in the same manner as the nesting 1 of the first embodiment. That is, FIG. 2 is a cross-sectional view showing a usage state of the nesting 1A when the nesting 1 is replaced with the nesting 1A. Here, the insert 1 </ b> A is attached to the movable mold body 21 in the same manner as the insert 1 in FIG. 2. By using the nesting 1A, a molded body similar to that when the nesting 1 is used can be molded, and an example of the molded body 5 shown in FIG.

<Nested manufacturing method>
The insert 1A of the second embodiment is, for example, a recess provided in the insert body 2 as a recess provided on the surface of the block body 6 in the manufacturing method of the insert 1 of the first embodiment described with reference to FIG. It can manufacture by using what has the same shape as the recessed part provided in 2 A of nested bodies instead of what has the same shape.

<Effect>
The nesting and the manufacturing method of the nesting of this embodiment have the following effects.
5 (b) and 5 (c), not only the inclined surface γ but also the vertical surface ε is formed in the recess provided in the nesting body 2A, so that the heat insulating layer 3 is thin. There are fewer parts as compared with the case of FIG. 1 (b) and FIG. 1 (c). Therefore, when the nesting 1 </ b> A is used, a higher heat insulating effect can be ensured in the portion that contacts the surface of the heat insulating layer 3. In particular, as shown in FIG. 5C, when the width of the heat insulating layer 3 is narrow, by having the vertical plane ε, more area occupied by the heat insulating layer can be secured and the heat insulating effect can be further improved. So it is effective.

In addition, when the vertical surface ε is formed together with the inclined surface γ in the recess provided in the nesting body 2A, the thickness direction of the heat insulating layer 3 in the removing step when the nesting 1A is manufactured according to the manufacturing method shown in FIG. Even if the removal of the heat insulating layer 3 is continued after the removal to the position of the upper surface of the block body 6 is continued, the width of the heat insulating layer 3 is kept constant for a while. Therefore, even if the heat insulating layer 3 is removed excessively, there is no possibility that the width and area of the range in which the heat insulating layer 3 is formed are immediately changed. Further, at the stage of designing the mold, the width of the heat insulating layer 3 can be determined, and even if the heat insulating layer 3 is removed excessively, a range where the heat insulating layer is not formed (a range where heat insulation cannot be performed) is expanded. There is no fear.
Other effects are the same as those achieved by the nesting and the manufacturing method of the nesting of the first embodiment.

≪Third embodiment≫
<Nested>
FIG. 7 is a view schematically showing the insert 1B of the third embodiment, (a) is a perspective view, (b) is a cross-sectional view showing a QQ cross section of (a), and (c) is a cross-sectional view. It is sectional drawing which shows the RR cross section of (a). In the third embodiment, differences from the first embodiment will be mainly described. In the third embodiment, the same or equivalent components as those in the first embodiment will be described with the same reference numerals. Moreover, in 3rd embodiment, the description which overlaps with 1st embodiment is abbreviate | omitted suitably.

  As shown in FIG. 7, the nesting 1 </ b> B of this embodiment includes a nesting body 2 </ b> B and a heat insulating layer 3. That is, the insert 1B of this embodiment is different from the insert 1 of the first embodiment in that the heat insulating layer 3 is provided on the entire upper surface of the insert body 2B and there is no hole through which the protruding pin passes.

  FIG. 8 is a cross-sectional view showing a usage state of the insert 1B of the third embodiment. The insert 1B is used by being placed in the mold 10B. The mold 10B includes a movable mold 20B and a fixed mold 30B. The fixed mold 30B includes a fixed mold main body 31B, and a nest 1B, a nest 22 and a nest 23 attached to the fixed mold main body 31B. The cavity 4 is formed by assembling the mold 10B from the movable mold 20B and the fixed mold 30B. The cavity surface of the cavity 4 is constituted by a nest 1B, a nest 22, a nest 23, and a movable mold 20B. The movable mold 20B appropriately has a hole (not shown) through which a protruding pin passes so that the cavity 4 can be filled with molten resin and solidified to be taken out.

  A molded body can be molded by filling the cavity 4 formed in the mold 10B with molten resin and solidifying the cavity. By using the insert 1B, it is possible to form a molded body similar to that when the insert 1 is used, and an example thereof is a molded body 5 shown in FIG.

<Nested manufacturing method>
FIG. 9 is a cross-sectional view schematically showing an example of a method for manufacturing the insert 1B of the third embodiment. The manufacturing method includes a heat insulating layer forming step and a removing step.

  The heat insulating layer forming step is a step of changing the states of FIGS. 9A1 and 9A2 to the states of FIGS. 9B1 and 9B2, respectively. A heat insulation layer formation process is a process of forming the heat insulation layer 3 on the block body 6B which consists of a nesting material which comprises the nest | insert 1B, and obtaining the composite body 7B containing the block body 6B and the heat insulation layer 3. FIG. In addition, as a nesting material, the thing similar to what was illustrated by 1st embodiment is mentioned, The block body 6B can be manufactured by a conventionally well-known casting method etc.

  As a formation method of the heat insulation layer 3, the thing similar to having illustrated by 1st embodiment is mentioned.

  The removal step is a step of changing the states of FIG. 9B1 and FIG. 9B2 to the states of FIG. 9C1 and FIG. 9C2, respectively. As shown in FIG. 9, in the removal step, a part of the block body 6B is removed in the width direction and the depth direction of the block body 6B, and the heat insulation layer 3 is removed in the thickness direction, the width direction, and the depth direction of the heat insulation layer 3. Remove some. In this step, the removal of the block body 6B and the heat insulating layer 3 is performed until the position indicated by the dotted line in FIGS. 9B1 and 9B2 is reached. The shape indicated by the dotted line is the same as the outer shape of the nest 1B shown in FIGS. 9 (c1) and 9 (c2).

  Examples of the method for removing the block body 6B and the heat insulating layer 3 include the same methods as those exemplified in the first embodiment.

<Effect>
The nesting and the manufacturing method of the nesting of this embodiment have the following effects.
By using the insert 1B, the heat insulating layer can be easily formed in the heat insulating mold in which the insert 1B is arranged. For example, since the shape of the cavity surface is complicated, even if it is difficult to form a heat insulating layer with the movable mold or the fixed mold being integrated, the insert 1B is manufactured separately and the insert By forming the heat insulation layer 3 in 1B, the heat insulation layer which comprises a part of desired cavity surface in a heat insulation metal mold | die can be comprised easily. In addition, even if the heat insulation layer 3 is chipped or peeled off, only the insert 1B needs to be replaced, so that the maintenance of the heat insulation mold is unlikely to be complicated.

  Similarly to the case described in the first embodiment, in the molded body 5 shown in FIG. 3, when the thickness of the bottom surface is thinner than the thickness of the side surface and / or the area of the bottom surface is wider than the area of the side surface, the insert 1B When is used, the fluidity of the molten resin is easily maintained at the bottom surface of the molded body 5, and weld adhesion is improved.

  The effects of the method for manufacturing a nest according to this embodiment are the same as those described in the first embodiment. That is, first, since the thermal spraying is performed on the block body 6B having a larger size, it is difficult to overheat even if the scanning speed of the thermal spraying is normal. Further, since spraying can be performed at a normal scanning speed, the sprayed surface is unlikely to become rough. By processing into a desired shape after thermal spraying, it is possible to easily obtain the insert 1B having the heat insulating layer 3 having a good surface state.

  The preferred embodiments of the nesting and the manufacturing method of the nesting of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and can be implemented in various forms.

  For example, in the first embodiment, as shown in FIGS. 1B and 1C, the surface β of the nesting body 2 exists on the same surface as the surface α around the entire surface α of the heat insulating layer 3. The surface β may be absent. Even in such a configuration, the effect of the thermal insulation layer being embedded in the recess provided in the nesting body is exhibited, so that problems such as breakage and peeling of the thermal insulation layer are unlikely to occur.

  In the first or second embodiment, the nesting 1 or the nesting 1A is used in the movable mold 20, but may be used in a fixed mold. In the third embodiment, the insert 1B is used in the fixed mold 30B, but may be used in a possible mold. Thus, the insert of the present invention may be arranged on the movable mold side or on the solid mold side.

  In the first or second embodiment, the position of the hole through which the protruding pin passes is the side surface of the nesting body 2 or the nesting body 2A, but these positions are examples and are not particularly limited as long as the molded body can be taken out, It is appropriately selected in consideration of the appearance, strength, etc. of the molded body. For example, instead of the side surface of the nesting body 2 or the nesting body 2A, a hole is formed on the side surface of the rectangular parallelepiped region where the heat insulating layer 3 is formed. It may be formed as a through hole. Further, in the third embodiment, the insert 1B does not have a hole through which the protruding pin passes. However, like the insert 1 and the insert 1A, the insert 1B is formed on the side surface and penetrates the heat insulating layer 3 and the insert body 2B vertically. However, it may be formed as a hole through which the protruding pin passes.

DESCRIPTION OF SYMBOLS 1, 1A, 1B Nesting 2, 2A, 2B Nesting main body 3 Heat insulation layer 4 Cavity 5 Molding body 6, 6B Block body 7, 7B Composite body 10, 10B Mold 20, 20B Movable mold 21 Movable mold body 22, 23 Nest 30, 30B Fixed mold 31B Fixed mold body

Claims (8)

Nests placed in the mold,
A nesting comprising a nesting body and a heat insulating layer provided on at least a part of the nesting body and constituting a part of a cavity surface.   The nesting according to claim 1, wherein the heat insulating layer is embedded in a recess provided in the nesting body.   The nesting according to claim 2, wherein the surface of the nesting body exists on the same surface as the surface around the entire periphery of the surface of the heat insulating layer.   The nesting according to claim 3, wherein a width of the surface of the nesting main body existing around the entire surface of the heat insulating layer is 0.1 mm or more.   The nesting according to any one of claims 2 to 4, wherein the recess has an inclined surface formed from an opening edge of the recess toward the center of the bottom of the recess.   The concave portion has a vertical surface extending from the opening edge toward the bottom side of the concave portion perpendicular to a surface formed by the opening edge of the concave portion, and the opening edge as an upper end of the vertical surface. The nest | insert in any one of Claims 2-4 which has an inclined surface formed toward the bottom center of the said recessed part from the lower end of the said perpendicular | vertical surface. It is a manufacturing method of the nest | insert of Claim 1, Comprising:
A heat insulating layer forming step of forming a heat insulating layer on a block body made of a nesting material constituting the insert, and obtaining a composite including the block body and the heat insulating layer;
A removal step of removing a part of the block body or a part of the block body and a part of the heat insulating layer from the composite. The nesting is the nesting according to any one of claims 2 to 6,
The heat insulating layer forming step is made of a nesting material constituting the nesting, forming a heat insulating layer on a block body having a recess on the surface, filling at least the recess with the heat insulating layer, and the block body and the The manufacturing method according to claim 7, which is a step of obtaining a composite including a heat insulating layer.

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