JP2011230445A - Die and temperature-sensitive magnetic material for die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die which can more correctly control a forming temperature while suppressing the complication of the internal structure of the die.SOLUTION: The die 1 includes: an upper die 10; and a lower die 20 arranged to be confronted with the upper die 10. The lower face 10a of the upper die 10 and the upper face 20a of the lower die 20 are disposed with temperature-sensitive magnetic material layers 12, 22 including temperature-sensitive magnetic material with Curie temperature, respectively.

Description

  The present invention relates to a mold and a thermosensitive magnetic material for a mold, and particularly to a thermosensitive magnetic material for a mold having a Curie temperature and a mold using the thermosensitive magnetic material for the mold.

  Conventionally, a mold using a temperature-sensitive magnetic material for a mold having a Curie temperature is known (see, for example, Patent Document 1).

  Patent Document 1 discloses a molding die including a fixed nesting portion and a movable nesting portion each having a groove portion formed therein, and an electromagnetic induction heating coil disposed in the groove portion inside each of the fixed nesting portion and the movable nesting portion. Is disclosed. In the molding die described in Patent Document 1, an electromagnetic induction heating coil is disposed in each groove portion in a state of being wound around a Ni—Cu alloy (temperature-sensitive magnetic material) having a Curie temperature. When a high-frequency current is passed through the electromagnetic induction heating coil, the template (molding part) around the electromagnetic induction heating coil is heated to the Curie temperature together with the Ni—Cu alloy. On the other hand, since the Ni—Cu alloy is not heated above the Curie temperature, the template (molding die) around the electromagnetic induction heating coil is not heated above the Curie temperature and is maintained near the Curie temperature. Has been.

JP-A-5-96576

  However, in the molding die disclosed in Patent Document 1, in order to dispose the Ni—Cu alloy having a Curie temperature (temperature-sensitive magnetic material) and the electromagnetic induction heating coil inside the molding die, It is necessary to provide a groove portion in each of the movable nesting portions. For this reason, there is a problem that the internal structure of the molding die becomes complicated. In addition, a Ni—Cu alloy (temperature-sensitive magnetism) is formed inside each of the fixed nesting part and the movable nesting part (the rear side of the front part of the fixed nesting part and the movable nesting part) separated from the region (front surface) in contact with the molding region side. Therefore, it is difficult to accurately control the temperature of the front surfaces of the fixed nesting portion and the movable nesting portion. For this reason, there is also a problem that it is difficult to control the molding temperature more accurately.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to control the molding temperature more accurately while suppressing the complexity of the internal structure of the mold. It is an object of the present invention to provide a mold that can be used and a temperature-sensitive magnetic material for the mold used in the mold.

Means for Solving the Problems and Effects of the Invention

  A mold according to a first aspect of the present invention includes a first mold part and a second mold part disposed so as to face the first mold part, and at least one of the first mold part and the second mold part. A temperature control unit including a temperature-sensitive magnetic material having a Curie temperature is disposed on at least a part of the surface on the molding region side.

  In the mold according to the first aspect of the present invention, as described above, a temperature-sensitive magnetic material having a Curie temperature is formed on at least a part of the surface of at least one of the first mold part and the second mold part. By disposing the temperature control unit including, there is no need to form a groove for disposing the temperature-sensitive magnetic material inside each of the first mold part and the second mold part, so the internal structure of the mold is complicated Can be suppressed. Further, by disposing a temperature control unit including a temperature-sensitive magnetic material having a Curie temperature on at least a part of the surface of at least one of the first mold part and the second mold part, the first mold part and Unlike the case where the temperature-sensitive magnetic material is disposed inside each of the second mold parts, the temperature of at least a part of the surface of at least one molding region side of the first mold part and the second mold part is more accurately sensed. It can be kept near the Curie temperature of the thermomagnetic material. Thereby, the molding temperature can be controlled more accurately.

  In the mold according to the first aspect, preferably, the first mold part and the second mold part are made of a metal material having no Curie temperature, and the temperature control unit is at least one of the first mold part and the second mold part. It is a temperature control layer containing a temperature-sensitive magnetic material formed on at least a part of the surface on the one molding region side. If comprised in this way, even if it is a case where a 1st type | mold part and a 2nd type | mold part consist of a metal material which does not have a Curie temperature, the surface by the side of at least one shaping | molding area | region of a 1st type | mold part and a 2nd type | mold part The molding temperature can be more accurately controlled near the Curie temperature of the temperature-sensitive magnetic material by the temperature control layer including the temperature-sensitive magnetic material formed on at least a part of the temperature-sensitive magnetic material.

  In this case, the temperature control layer including the temperature-sensitive magnetic material is preferably formed by thermal spraying. If comprised in this way, the temperature control layer containing a temperature-sensitive magnetic material can be easily formed with the substantially uniform thickness on the surface of a 1st type | mold part and a 2nd type | mold part. Further, the adhesion between the temperature control layer and at least one of the first mold part and the second mold part can be improved by the amount formed by thermal spraying.

  In the mold according to the first aspect, the temperature-sensitive magnetic material is preferably made of a Ni—Fe alloy. With such a configuration, various temperature-sensitive magnetic materials having different Curie temperatures can be obtained by changing the Ni content, so that the molding region can be formed at a molding temperature suitable for a raw material such as a resin poured into the mold. It is possible to obtain a temperature-sensitive magnetic material capable of controlling the temperature.

  In this case, the temperature-sensitive magnetic material is preferably made of a Ni—Fe alloy containing Cr. If comprised in this way, the temperature sensitive magnetic material from which Curie temperature differs can be obtained by changing the content rate of Cr and the content rate of Ni. Moreover, the corrosion resistance of a temperature-sensitive magnetic material can be improved by containing Cr.

  In the mold in which the temperature-sensitive magnetic material is made of a Ni—Fe alloy containing Cr, preferably, the first mold part and the second mold part are made of a metal material having no Curie temperature, and the Ni—Fe alloy containing Cr. The composition of the thermosensitive magnetic material is such that the value of the thermal expansion coefficient of the thermosensitive magnetic material is close to the value of the thermal expansion coefficient of the first mold part and the second mold part in which the temperature control unit is disposed. It has been adjusted. If comprised in this way, a temperature control part, a 1st type | mold part, and a 2nd type | mold part can be thermally deformed only substantially the same deformation amount in the same temperature environment. As a result, the temperature control unit changes the amount of deformation due to thermal deformation of the temperature control unit and the amount of deformation due to thermal deformation of the first mold part and the second mold part, resulting in the temperature control unit being the first mold part and the second mold part. It can suppress that it peels from.

  In the mold according to the first aspect, preferably, the temperature control unit is disposed in a region corresponding to the molding region among the surface of the first mold portion on the molding region side and the surface of the second mold portion on the molding region side. ing. If comprised in this way, compared with the case where a temperature control part is formed only in a part of surface of the at least one shaping | molding area | region side of a 1st type | mold part and a 2nd type | mold part, a shaping | molding temperature is temperature more correctly. It can be controlled near the Curie temperature of the temperature-sensitive magnetic material of the control unit.

  In the mold according to the first aspect, preferably, the temperature-sensitive magnetic material includes a first temperature-sensitive magnetic material having a first Curie temperature and a second temperature-sensitive temperature having a second Curie temperature higher than the first Curie temperature. The temperature control unit includes a first temperature control unit including the first temperature-sensitive magnetic material, and a second temperature disposed in a different region from the first temperature control unit. And a control unit. If comprised in this way, while the 1st temperature control part vicinity of a shaping | molding area | region can be hold | maintained to 1st Curie temperature, the 2nd Curie temperature vicinity of the 2nd temperature control part of a shaping | molding area | region different from a 1st temperature control part may be hold | maintained. Can be held in. Thereby, the several area | region in a shaping | molding area | region can be controlled to a mutually different temperature.

  In this case, it is preferable that the raw material is poured into the molding region, and the second temperature control unit is disposed in the region where the raw material hardly flows. If comprised in this way, the area | region where a raw material will not flow easily can be kept at a temperature higher than the other area | region in a shaping | molding area | region by the 2nd temperature control part which has 2nd Curie temperature larger than 1st Curie temperature. Thereby, since it can suppress that a raw material stagnates in the area | region where a raw material does not flow easily, a shaping | molding function can be improved.

  In the mold in which the second temperature control unit is disposed in the region where the raw material hardly flows, preferably, a first opening and a second opening for pouring the raw material into the molding region are formed, and the second temperature control unit Is disposed in a region where the raw material poured from the first opening and the raw material poured from the second opening merge. If comprised in this way, in the area | region where a raw material does not flow easily because the raw material poured from the 1st opening part and the raw material poured from the 2nd opening part merge, it is 2nd Curie higher than 1st Curie temperature. By disposing the second temperature control unit having a temperature, the temperature of the region in which the raw material hardly flows can be maintained higher than the other regions in the molding region. Thereby, since it can suppress that a raw material stagnates in the area | region where a raw material does not flow easily, a shaping | molding function can be improved.

  In the mold in which the second temperature control unit is arranged in a region where the raw material hardly flows, preferably, an opening for pouring the raw material into the molding region is formed, and a portion other than a portion connected to the opening of the molding region is formed. The region is configured to be a closed region, and the second temperature control unit is disposed in the terminal region of the closed region opposite to the portion connected to the opening. If comprised in this way, the temperature of the area | region where a raw material does not flow easily like the termination area | region of the closed area | region on the opposite side to the part connected with an opening part by the 2nd temperature control part will be the other area | region in a shaping | molding area | region. Since the retention of the raw material in the region where the raw material is difficult to flow is suppressed, the molding function can be enhanced.

  In the mold according to the first aspect, preferably, at least one of the first mold part and the second mold part is made of a temperature-sensitive magnetic material. With this configuration, it is not necessary to separately form a temperature-sensitive magnetic material layer on the surface of at least one of the first mold part and the second mold part, so that the mold manufacturing process can be simplified. .

  In the mold according to the first aspect, preferably, an induction heating coil that is disposed in the vicinity of the temperature control unit in the molding region when the temperature-sensitive magnetic material constituting the temperature control unit is heated and heats the temperature control unit by induction heating is provided. Further prepare. If comprised in this way, at least one part of the surface by the side of the at least one shaping | molding area | region side of a 1st type | mold part and a 2nd type | mold part easily by the heating by the induction heating coil arrange | positioned in the temperature control part vicinity of a shaping | molding area | region. Can be kept near the Curie temperature of the temperature-sensitive magnetic material.

  A temperature-sensitive magnetic material for a mold according to a second aspect of the present invention is used in a mold including a first mold part and a second mold part disposed so as to face the first mold part, and has a Curie temperature. A temperature-sensitive magnetic material for a mold, which is disposed on at least a part of the surface of at least one of the first mold part and the second mold part on the molding region side.

  In the thermosensitive magnetic material for molds according to the second aspect of the present invention, as described above, the thermosensitive magnetic material for molds is formed on the side of at least one of the first mold part and the second mold part of the mold. A member for induction heating such as an IH coil is formed in the molding region in order to generate heat in the temperature-sensitive magnetic material for the mold disposed in the mold by being arranged on at least a part of the surface of the mold. Since there is no need to form a groove for placing the thermosensitive magnetic material for the mold in each of the first mold part and the second mold part, the internal structure of the mold is complicated. Can be suppressed. In addition, the temperature-sensitive magnetic material for the mold is configured to be disposed on at least a part of the surface of at least one of the first mold part and the second mold part on the mold region side. Unlike the case where the temperature-sensitive magnetic material for the mold is disposed inside the part and the second mold part, the temperature of at least a part of the surface on the molding region side of at least one of the first mold part and the second mold part is set. More accurately, it can be kept near the Curie temperature of the temperature-sensitive magnetic material for molds. Thereby, the molding temperature can be controlled more accurately.

It is sectional drawing which showed the metal mold | die by 1st Embodiment of this invention. It is sectional drawing which showed the state which has arrange | positioned the IH coil (induction heating coil) in the formation area of the metal mold | die by 1st Embodiment of this invention. It is the figure which showed the formation method of the high temperature magnetic material layer and low temperature magnetic material layer by 1st Embodiment of this invention. It is sectional drawing which showed the metal mold | die by 2nd Embodiment of this invention. It is sectional drawing which showed the metal mold | die by 3rd Embodiment of this invention. It is the perspective view which showed the test material of Curie temperature measurement performed in order to confirm the effect of this invention. It is a graph of the amplitude magnetic permeability with respect to the temperature in the Curie temperature measurement performed in order to confirm the effect of this invention. It is the table | surface which showed the experimental result of Curie temperature measurement performed in order to confirm the effect of this invention, thermal expansion coefficient measurement, tensile strength measurement, and elongation measurement. It is the figure which showed the experimental result of the corrosion resistance measurement performed in order to confirm the effect of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, with reference to FIG. 1 and FIG. 2, the structure of the metal mold | die 1 by 1st Embodiment of this invention is demonstrated.

  The mold 1 according to the first embodiment of the present invention is used for molding a resin into a predetermined product by injection molding. As shown in FIG. 1, the mold 1 includes an upper mold 10 disposed on the upper side and a lower mold 20 disposed on the lower side so as to face the upper mold 10. The upper mold 10 is an example of the “first mold part” in the present invention, and the lower mold 20 is an example of the “second mold part” in the present invention.

  In addition, at the end portion on one side (X1 side) of the mold 1 and the end portion on the other side (X2 side) opposite to the X1 side, molten resin (thermoplastic resin) will be described later. Injection ports 30 and 31 for injection into A are provided. The injection ports 30 and 31 are examples of the “first opening” and the “second opening” in the present invention, respectively. Resin is an example of the “raw material” of the present invention.

  In addition, a recess 10b that is recessed upward is formed near the center of the lower surface 10a of the upper mold 10, and in the state of facing the recess 10b near the center of the upper surface 20a of the lower mold 20. A convex portion 20b that protrudes upward is formed.

The upper mold 10 and the lower mold 20 are both made of general carbon steel having a thermal expansion coefficient of about 11 × 10 ⁻⁶ / ° C. or more and about 12 × 10 ⁻⁶ / ° C. or less, and has a Curie temperature. Absent. That is, the upper mold 10 and the lower mold 20 do not have a property of changing from a ferromagnetic material to a paramagnetic material at a predetermined temperature.

  Here, in the first embodiment, a temperature control layer composed of the high temperature magnetic material layer 11 and the low temperature magnetic material layer 12 is formed on substantially the entire surface on the lower surface 10a of the upper mold 10 on the molding area A side to be described later. Yes. In addition, a temperature control layer including a high temperature magnetic material layer 21 and a low temperature magnetic material layer 22 is formed on substantially the entire surface of the upper surface 20a of the lower mold 20 on the molding region A side. The high temperature magnetic material layer 11 and the low temperature magnetic material layer 12 are each formed by spraying onto the lower surface 10a of the upper mold 10 by thermal spraying, and the high temperature magnetic material layer 21 and the low temperature magnetic material layer 22 are respectively It is formed by spraying onto the upper surface 20a of the lower mold 20 by thermal spraying. The high temperature magnetic material layers 11 and 21 and the low temperature magnetic material layers 12 and 22 are formed to have a substantially uniform thickness (about 1 mm). The high temperature magnetic material layers 11 and 21 are examples of the “second temperature control unit”, “temperature control unit”, and “temperature control layer” of the present invention, and the low temperature magnetic material layers 12 and 22 of the present invention It is an example of “first temperature control unit”, “temperature control unit”, and “temperature control layer”. The lower surface 10a and the upper surface 20a are examples of the “surface” of the present invention.

  Further, the lower surface 11a of the high temperature magnetic material layer 11 and the upper surface 21a of the high temperature magnetic material layer 21 are formed so as to face each other with a predetermined interval. Further, the lower surface 12a of the low-temperature magnetic material layer 12 and the upper surface 22a of the low-temperature magnetic material layer 22 are formed so as to face each other at a predetermined interval. A molding region A into which molten resin is poured is constituted by these predetermined intervals. Here, the resin poured into the molding region A is configured to be cured by being cooled to form a resin product (not shown) molded into a shape corresponding to the mold 1. . In addition, the area | region located in the approximate center of the X direction pinched | interposed by the recessed part 10b and the convex part 20b among the shaping | molding area | regions A is an area | region where the resin which flowed in from the injection ports 30 and 31, respectively merges, and the molten resin flows This corresponds to the difficult stay region B.

  In the first embodiment, the high-temperature magnetic material layer 11 is disposed in a substantially central region in the X direction of the recess 10b corresponding to the stay region B in the molding region A, and the low-temperature magnetic material layer 12 is It is arranged in a region other than the stay region B in the molding region A. Similarly, the high temperature magnetic material layer 21 is disposed in a substantially central region in the X direction of the convex portion 20b corresponding to the stay region B in the molding region A, and the low temperature magnetic material layer 22 is disposed in the molding region A. It is arranged in an area other than the stay area B.

  The high temperature magnetic material layers 11 and 21 are made of a 51Ni-11Cr-Fe alloy (an alloy composed of 51 mass% Ni, 11 mass% Cr, inevitable impurities and Fe) having a Curie temperature of about 205 ° C. Become. On the other hand, the low-temperature magnetic material layers 12 and 22 are made of a 39Ni-9Cr-Fe alloy (an alloy composed of 39% by mass of Ni, 9% by mass of Cr, inevitable impurities and Fe) having a Curie temperature of about 145 ° C. Become. The 51Ni-11Cr—Fe alloy is an example of the “second temperature sensitive magnetic material” in the present invention, and the 39Ni-9Cr—Fe alloy is an example of the “first temperature sensitive magnetic material” in the present invention. Further, about 205 ° C. is an example of the “second Curie temperature” of the present invention, and about 145 ° C. is an example of the “first Curie temperature” of the present invention.

  Further, the high temperature magnetic material layers 11 and 21 and the low temperature magnetic material layers 12 and 22 arranged in the molding region A of the mold 1 are configured to be induction heated by the magnetic field generated from the IH coil 40. . As shown in FIG. 2, the IH coil 40 has a structure in which the high temperature magnetic material layers 11 and 21 and the low temperature magnetic material layers 12 and 22 are heated when the high temperature magnetic material layers 11 and 21 and the low temperature magnetic material layers 12 and 22 are heated. It is comprised so that it may arrange | position to the shaping | molding area | region A in the state contact | abutted (contacted) to. The IH coil 40 is an example of the “induction heating coil” in the present invention.

  Further, the high temperature magnetic material layers 11 and 21 and the low temperature magnetic material layers 12 and 22 are respectively separated from a ferromagnetic material (low temperature side) to a paramagnetic material (high temperature side) with a Curie temperature (about 205 ° C. and about 145 ° C.) as a boundary. ). As a result, when the vicinity of the surface corresponding to the molding region A of the mold 1 is induction-heated, in the region where the low temperature magnetic material layers 12 and 22 are disposed, the Curie temperature of the low temperature magnetic material layers 12 and 22 is about 145. When the temperature is higher than or equal to ° C., the 39Ni-9Cr—Fe alloy of the low temperature magnetic material layers 12 and 22 changes from a ferromagnetic material to a paramagnetic material. As a result, the low temperature magnetic material layers 12 and 22 changed to paramagnetic materials hardly react to the magnetic field of the IH coil 40, so that the temperature hardly rises above the Curie temperature (about 145 ° C.). Thereby, the portions of the upper mold 10 and the lower mold 20 in the vicinity of the surfaces (the lower surface 12a and the upper surface 22a) in contact with the forming region A where the low temperature magnetic material layers 12 and 22 are formed and the low temperature magnetic material layers 12 and 22 are approximately It is configured to be maintained at a temperature in the vicinity of 145 ° C.

  Similarly, when the vicinity of the surface corresponding to the molding region A of the mold 1 is induction-heated, in the region where the high temperature magnetic material layers 11 and 21 are disposed, the Curie temperature of the high temperature magnetic material layers 11 and 21 is about 205 ° C. If it becomes above, the 51Ni-11Cr-Fe alloy of the high temperature magnetic material layers 11 and 21 will change from a ferromagnetic material to a paramagnetic material. As a result, the high temperature magnetic material layers 11 and 21 that have been changed to paramagnetic materials hardly react to the magnetic field of the IH coil 40, and therefore the temperature hardly rises above the Curie temperature (about 205 ° C.). Thus, the portions of the upper mold 10 and the lower mold 20 in the vicinity of the surfaces (the lower surface 11a and the upper surface 21a) in contact with the molding region A where the high temperature magnetic material layers 11 and 21 are formed and the high temperature magnetic material layers 11 and 21 are approximately It is configured to be maintained at a temperature in the vicinity of 205 ° C.

The 51Ni-11Cr—Fe alloy of the high temperature magnetic material layers 11 and 21 and the 39Ni-9Cr—Fe alloy of the low temperature magnetic material layers 12 and 22 are both about 10.3 × 10 ⁻⁶ / ° C. or more and about 12 The composition of Ni and Cr is adjusted to have a coefficient of thermal expansion of 0.7 × 10 ⁻⁶ / ° C. or less. The thermal expansion coefficient having a value of about 10.3 × 10 ⁻⁶ / ° C. or more and about 12.7 × 10 ⁻⁶ / ° C. or less is the heat of the upper mold 10 and the lower mold 20 made of general carbon steel. It is in the vicinity of an expansion coefficient (about 11 × 10 ⁻⁶ / ° C. or more and about 12 × 10 ⁻⁶ / ° C. or less).

  The high temperature magnetic material layers 11 and 21 and the low temperature magnetic material layers 12 and 22 are composed of 30% by mass to 55% by mass Ni, 3% by mass to 15% by mass Cr, unavoidable impurities and Fe. Any Ni—Fe alloy containing Cr may be used. Further, the high temperature magnetic material layers 11 and 21 and the low temperature magnetic material layers 12 and 22 may be Ni—Fe alloys composed of 30 mass% or more and 50 mass% or less of Ni, unavoidable impurities, and Fe. At this time, the Curie temperature of the high temperature magnetic material layers 11 and 21 needs to be set higher than the Curie temperature of the low temperature magnetic material layers 12 and 22 in the range of about 10 ° C. to about 80 ° C.

  Next, with reference to FIG. 1 and FIG. 2, the method to shape | mold a resin product using the metal mold | die 1 by 1st Embodiment of this invention is demonstrated.

  First, the upper mold 10 and the lower mold 20 are temporarily separated from each other, and the IH coil 40 is disposed in the molding region A of the mold 1. Then, the IH coil 40 is brought close to (contact) with the high temperature magnetic material layers 11 and 21 and the low temperature magnetic material layers 12 and 22, and then an alternating current is passed through the IH coil 40 so that a constant time interval is obtained. A magnetic field that changes at about 30 kHz is generated around the IH coil 40. As a result, in response to a magnetic field that changes at regular time intervals, an induced current flows through the high temperature magnetic material layers 11 and 21 and the low temperature magnetic material layers 12 and 22, and the high temperature magnetic material layers 11 and 21 and the low temperature magnetic material Layers 12 and 22 generate heat. Thereby, the surface (lower surface 11a and 12a and upper surface 21a and 22a) vicinity of the shaping | molding area | region A of the metal mold | die 1 is heated.

  Here, in the first embodiment, when the forming region A is heated to about 145 ° C., the 39Ni-9Cr—Fe alloy of the low-temperature magnetic material layers 12 and 22 is not heated above the Curie temperature (about 145 ° C.). Therefore, the temperature of the region other than the staying region B in the forming region A in which the low temperature magnetic material layers 12 and 22 are disposed is maintained at about 145 ° C. On the other hand, since the Curie temperature of the 51Ni-11Cr—Fe alloy of the high temperature magnetic material layers 11 and 21 is higher than about 145 ° C. (about 205 ° C.), the temperature of the staying region B where the high temperature magnetic material layers 11 and 21 are disposed. Is further heated to above about 145 ° C.

  When the stay region B is heated to about 205 ° C., the high temperature magnetic material layers 11 and 21 are not heated to the Curie temperature (about 205 ° C.) or higher, so that the stay in which the high temperature magnetic material layers 11 and 21 are disposed. The temperature of the region B is maintained around 205 ° C. As a result, the temperature in the vicinity of the surface (the lower surface 11a and the upper surface 21a in contact with the molding region A) of the region where the high temperature magnetic material layers 11 and 21 are disposed is maintained at about 205 ° C., and the low temperature magnetic material layer 12 and The temperature in the vicinity of the surface (the lower surface 12a and the upper surface 22a in contact with the forming region A) of the region where 22 is disposed is maintained at about 145 ° C. In addition, about 205 degreeC vicinity and about 145 degreeC vicinity are examples of molding temperature.

  Thereafter, the upper mold 10 and the lower mold 20 are temporarily separated from each other, and the IH coil 40 is taken out from the molding area A, and then the molding area A is formed again with the interval between the upper mold 10 and the lower mold 20. As close as possible. Then, the molten resin is poured into the molding region A from the injection ports 30 and 31. At this time, in the molding region A, the molten resin hardly flows in the stay region B where the resin poured from the injection port 30 and the resin poured from the injection port 31 merge. However, in the molding region A, the temperature (about 205 ° C.) of the substantially central region in the X direction of the recess 10b corresponding to the stay region B (the region where the high temperature magnetic material layers 11 and 21 are disposed) Since the temperature is higher than the temperature (about 145 ° C.) in the region where the low temperature magnetic material layers 12 and 22 are disposed, the molten resin is less likely to stay in the stay region B in the molding region A.

  Then, after a predetermined amount of molten resin is poured into the molding region A, the mold 1 is cooled to cure the resin. Thereafter, the distance between the upper mold 10 and the lower mold 20 is widened, and the cured resin is taken out to complete a resin product molded into a shape corresponding to the molding region A.

  Next, with reference to FIG. 1 and FIG. 3, formation of the high temperature magnetic material layer 11 and the low temperature magnetic material layer 12, the high temperature magnetic material layer 21 and the low temperature magnetic material layer 22, respectively, according to the first embodiment of the present invention. A method will be described.

  As shown in FIG. 3, the high temperature magnetic material layer 11 and the low temperature magnetic material layer 12 are formed on the lower surface 10 a of the upper mold 10 by the flame spraying apparatus 100 (the temperature sensitive magnetic material (51Ni-11Cr—Fe alloy and 39Ni-9Cr—). Fe alloy) is sprayed.

  Specifically, the flame spraying apparatus 100 is made of a temperature-sensitive magnetic material (51Ni-11Cr-Fe alloy or 39Ni-9Cr-Fe alloy) that is a thermal spray material, and a wire 101 having a diameter of about 3.2 mm, and a wire A nozzle 102 disposed so as to surround 101, and an air cap 103 disposed so as to surround wire 101 and nozzle 102. The nozzle 102 is provided to send a gas such as oxygen acetylene gas around the tip of the wire 101, and the air cap 103 is blown toward the side where the upper mold 10 which is a sprayed material is disposed. It is provided to adjust the amount of compressed air. The angle (spraying angle) for spraying the temperature-sensitive magnetic material, which is a thermal spray material, is set to about 90 degrees.

  Here, as a method of forming the high temperature magnetic material layer 11 and the low temperature magnetic material layer 12, first, a region where the high temperature magnetic material layer 11 is disposed (approximately the center in the X direction of the recess 10b corresponding to the stay region B in FIG. 1). In a state where a shielding plate (not shown) is disposed on the lower surface 10a corresponding to the region (1), the frame spraying apparatus 100 is disposed at a predetermined position. And gas is discharged from the nozzle 102 in the state which has arrange | positioned the wire 101 which consists of 39Ni-9Cr-Fe alloy in the predetermined position. Thereby, the tip of the wire 101 is heated to about 3000 ° C. and melted. Thereafter, the compressed air is discharged toward the tip of the wire 101 and the upper mold 10 through the air cap 103. As a result, the molten 39Ni-9Cr—Fe alloy at the tip of the wire 101 is sprayed onto the upper mold 10 in a state of being finely divided. As a result, the low temperature magnetic material layer 12 is formed on the lower surface 10 a corresponding to the region other than the stay region B in the molding region A of the upper mold 10.

  Then, after removing a shielding plate (not shown) arranged on the lower surface 10a corresponding to the staying region B in the molding region A, a shielding plate (not shown) is placed on the lower surface 10a corresponding to the region other than the staying region B in the molding region A. Deploy. Thereafter, by using the flame spraying apparatus 100 in a state where the wire 101 made of 51Ni-11Cr—Fe alloy is disposed at a predetermined position, the 51Ni-11Cr—Fe alloy is sprayed onto the upper mold 10 in a state of being finely divided. As a result, the high temperature magnetic material layer 11 is formed on the lower surface 10 a corresponding to the staying region B in the molding region A of the upper mold 10. Finally, a shielding plate (not shown) is removed.

  In addition, as a method of forming the high temperature magnetic material layer 21 and the low temperature magnetic material layer 22, first, a region where the high temperature magnetic material layer 21 is disposed (approximately the center in the X direction of the protrusion 20b corresponding to the stay region B in FIG. 1). A shielding plate (not shown) is disposed on the upper surface 20a corresponding to the region (2). Thereafter, by using the flame spraying apparatus 100 in a state where the wire 101 made of 39Ni-9Cr-Fe alloy is arranged at a predetermined position, the 39Ni-9Cr-Fe alloy is sprayed onto the lower mold 20 in a state of being finely divided. As a result, the low temperature magnetic material layer 22 is formed on the upper surface 20 a corresponding to the region other than the stay region B in the molding region A of the lower mold 20.

  Then, after removing a shielding plate (not shown) arranged on the upper surface 20a corresponding to the region other than the staying region B in the molding region A, a shielding plate (not shown) is placed on the upper surface 20a corresponding to the staying region B in the molding region A. Deploy. Thereafter, by using the flame spraying apparatus 100 with the wire 101 made of 51Ni-11Cr—Fe alloy arranged at a predetermined position, the 51Ni-11Cr—Fe alloy is sprayed onto the lower mold 20 in a state of being finely divided. As a result, the high temperature magnetic material layer 21 is formed on the upper surface 20 a corresponding to the staying region B in the molding region A of the lower mold 20. Finally, a shielding plate (not shown) is removed.

  In the first embodiment, as described above, the high temperature magnetic material layer 11 and the low temperature magnetic material layer 12 are formed on the lower surface 10a of the upper die 10 on the molding region A side, and on the molding region A side of the lower die 20. By forming a high-temperature magnetic material layer 21 and a low-temperature magnetic material layer 22 on a certain upper surface 20a, a temperature-sensitive magnetic material (51Ni-11Cr—Fe alloy and 39Ni-9Cr and 39Ni-9Cr is formed in each of the upper mold 10 and the lower mold 20. Since it is not necessary to form a groove for arranging (-Fe alloy), it is possible to prevent the internal structure of the mold 1 from becoming complicated.

  In the first embodiment, as described above, the high temperature magnetic material layer 11 and the low temperature magnetic material layer 12 are formed on the lower surface 10a on the molding region A side of the upper mold 10 and the molding region A of the lower mold 20 is formed. Unlike the case where the temperature-sensitive magnetic material is disposed inside each of the upper mold 10 and the lower mold 20 by forming the high-temperature magnetic material layer 21 and the low-temperature magnetic material layer 22 on the upper surface 20a on the side, the upper mold Thus, the temperature of the lower surface 10a of the lower surface 10 and the upper surface 20a of the lower die 20 can be more accurately maintained near the Curie temperature (about 205 ° C. and about 145 ° C.) of the temperature-sensitive magnetic material. Thereby, the molding temperature of the resin product can be controlled more accurately. Further, even when the upper mold 10 and the lower mold 20 are made of general carbon steel having no Curie temperature, the molding temperature can be more accurately controlled near the Curie temperature of the temperature-sensitive magnetic material.

  In the first embodiment, as described above, the high-temperature magnetic material layers 11 and 21 made of a 51Ni-11Cr-Fe alloy that is a temperature-sensitive magnetic material and the 39Ni-9Cr-Fe alloy that is a temperature-sensitive magnetic material). By forming the low-temperature magnetic material layers 12 and 22 formed by thermal spraying, the temperature-sensitive magnetic material layers 12 and 22 made of a temperature-sensitive magnetic material can be easily formed on the lower surface 10a of the upper mold 10 and the upper surface of the lower mold 20, respectively. It has a substantially uniform thickness (about 1 mm) on 20a and can be arranged for formation. Further, the adhesion between the temperature-sensitive magnetic material layer 12 and the lower surface 10a of the upper mold 10 and the adhesion between the temperature-sensitive magnetic material layer 22 and the upper surface 20a of the lower mold 20 are improved by the amount formed by thermal spraying. be able to.

  In the first embodiment, as described above, the temperature-sensitive magnetic material is configured to be composed of a Ni—Fe alloy containing Cr such as a 51Ni-11Cr—Fe alloy and a 39Ni-9Cr—Fe alloy. Since various temperature-sensitive magnetic materials having different Curie temperatures can be obtained by changing the Cr content and the Ni content, the temperature of the molding region A is set to a molding temperature suitable for the resin poured into the mold 1. A temperature-sensitive magnetic material capable of controlling the temperature can be obtained. Moreover, the corrosion resistance of a temperature-sensitive magnetic material can be improved by containing Cr.

In the first embodiment, as described above, the Ni—Cr—Fe alloy of the high temperature magnetic material layers 11 and 21 and the Ni—Cr—Fe alloy of the low temperature magnetic material layers 12 and 22 are both about 10 The high-temperature magnetic material layer 11 and the low-temperature magnetic material layer 12 are adjusted by adjusting the composition of Ni and Cr so as to have a thermal expansion coefficient of 3 × 10 ⁻⁶ / ° C. or more and about 12.7 × 10 ⁻⁶ / ° C. or less. And the upper die 10 can be thermally deformed by substantially the same amount of deformation under the same temperature environment, and the high temperature magnetic material layer 21 and the low temperature magnetic material layer 22 and the lower die 20 can be substantially the same amount of deformation under the same temperature environment. Only heat can be deformed. As a result, the high temperature magnetic material layer 11, the low temperature magnetic material layer 12, and the upper mold 10 are greatly different in deformation amount due to thermal deformation, so that the high temperature magnetic material layer 11, the low temperature magnetic material layer 12, and the upper mold 10 are different. The high temperature magnetic material layer 21 and the low temperature magnetic material layer 21 can be prevented from being peeled off, and the high temperature magnetic material layer 21 and the low temperature magnetic material layer 22 and the lower mold 20 are greatly different in deformation amount due to thermal deformation. It can suppress that 22 and the lower mold | type 20 peel.

  In the first embodiment, as described above, the temperature control layer composed of the high temperature magnetic material layer 11 and the low temperature magnetic material layer 12 is formed on substantially the entire surface (lower surface 10a) of the upper mold 10 on the molding region A side. At the same time, the temperature control layer composed of the high-temperature magnetic material layer 21 and the low-temperature magnetic material layer 22 is formed on substantially the entire surface (upper surface 20a) of the lower mold 20 on the molding region A side. The molding temperature in the layers 11 and 21 can be controlled near the Curie temperature (about 205 ° C.) of the temperature-sensitive magnetic material (51Ni-11Cr—Fe alloy), and the molding temperature in the low-temperature magnetic material layers 12 and 22 is It can be controlled around the Curie temperature (about 145 ° C.) of the temperature-sensitive magnetic material (39Ni-9Cr—Fe alloy).

  In the first embodiment, as described above, the temperature control layer includes the high temperature magnetic material layers 11 and 21 made of 51Ni-11Cr—Fe alloy having a Curie temperature of about 205 ° C. and the Curie of about 145 ° C., respectively. By forming the low-temperature magnetic material layers 12 and 22 made of a 39Ni-9Cr-Fe alloy having a temperature, a plurality of regions having different temperatures (molds other than the stay region B and the stay region B) are formed in the forming region A. Region A) can be controlled.

  In the first embodiment, as described above, the lower surface 10a and the upper surface 20a corresponding to the residence region B in the molding region A in which the resin flowing from the injection ports 30 and 31 merges and the molten resin hardly flows. In addition, by disposing the high temperature magnetic material layers 11 and 21, the temperature of the staying region B where the molten resin hardly flows can be maintained higher than the other regions in the molding region A. Thereby, it is possible to suppress the molten resin from staying in the staying region B where the molten resin is difficult to flow, so that the molding function can be enhanced.

  In the first embodiment, as described above, when the IH coil 40 is heated with the high temperature magnetic material layers 11 and 21 and the low temperature magnetic material layers 12 and 22, the high temperature magnetic material layers 11 and 21 and the low temperature magnetic material layer are used. By placing in the molding region A in contact (contact) with 12 and 22, the temperature of the lower surface 10a of the upper mold 10 and the upper surface 20a of the lower mold 20 can be easily brought close to the Curie temperature of the temperature-sensitive magnetic material. Can keep.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. In the mold 201 according to the second embodiment, unlike the first embodiment, only one injection port 230 is provided, and a termination region D is formed on the side opposite to the injection port 230. . The injection port 230 is an example of the “opening” in the present invention.

  First, with reference to FIG. 4, the structure of the metal mold | die 201 by 2nd Embodiment of this invention is demonstrated.

  In the mold 201 according to the second embodiment of the present invention, as shown in FIG. 4, the injection port is not provided at the end portion on one side (X1 side), and the end portion on the other side (X2 side). An injection port 230 for injecting the molten resin into the molding region C is provided. Further, the lower surface 210a on the X1 side of the recess 10b of the upper mold 210 is formed to be positioned below the lower surface 210a on the X2 side. Further, on the X1 side of the convex portion 20b of the lower mold 220, a convex portion 220c, and a concave portion 220d sandwiched between the convex portion 20b and the convex portion 220c and recessed downward are formed. Further, the lower surface 210a on the X1 side of the upper mold 210 and the convex portion 220c are configured to contact each other.

  In addition, a high temperature magnetic material layer 211 and a low temperature magnetic material layer 212 are formed on the lower surface 210a of the upper mold 210 except for the lower surface 210a that contacts the convex portion 220c on the X1 side. The high temperature magnetic material layer 211 is disposed in a region on the X1 side of the recess 10b corresponding to a termination region D (described later) in a molding region C (described later), and the low temperature magnetic material layer 212 is disposed at the end of the molding region C. Arranged in an area other than the area D. That is, the temperature control layer including the high temperature magnetic material layer 211 and the low temperature magnetic material layer 212 is formed on substantially the entire surface corresponding to the molding region C.

  Further, on the upper surface 220a of the lower mold 220, a high temperature magnetic material layer 221 and a low temperature magnetic material layer 222 are formed except for the upper end surface of the convex portion 220c on the X1 side. The high temperature magnetic material layer 221 is disposed in the region of the recess 220d corresponding to the termination region D in the molding region C, and the low temperature magnetic material layer 212 is disposed in a region other than the termination region D in the molding region C. Has been. That is, the temperature control layer composed of the high temperature magnetic material layer 221 and the low temperature magnetic material layer 222 is formed on substantially the entire surface corresponding to the molding region C.

  Further, the lower surface 211a of the high temperature magnetic material layer 211 corresponding to the X2 side of the concave portion 10b and the upper surface 221a of the high temperature magnetic material layer 221 corresponding to the X2 side of the convex portion 20b are opposed to each other with a predetermined interval. Is formed. Further, the lower surface 212a of the low temperature magnetic material layer 212 corresponding to the vicinity of the central portion of the concave portion 10b and the upper surface 222a of the low temperature magnetic material layer 222 corresponding to the vicinity of the central portion of the convex portion 20b are opposed to each other with a predetermined interval. It is formed as follows. Further, the lower surface 212a of the low temperature magnetic material layer 212 corresponding to the X1 side of the recess 10b and the upper surface 222a of the low temperature magnetic material layer 222 corresponding to the recess 220d are formed to face each other with a predetermined interval. . A molding region C into which the molten resin is poured is constituted by these predetermined intervals.

  Here, in 2nd Embodiment, the shaping | molding area | region C is comprised so that it may become a closed area | region in areas other than the part connected with the injection port 230. FIG. Further, the portion where the lower surface 211a of the high temperature magnetic material layer 211 corresponding to the X2 side of the concave portion 10b and the lower surface 221a of the high temperature magnetic material layer 221 corresponding to the X2 side of the convex portion 20b is located on the opposite side to the injection port 230. It is arrange | positioned and it is comprised so that it may be located in the terminal area | region D of the closed area | region. The area around the terminal area D corresponds to an area where molten resin is difficult to flow. The other configuration of the second embodiment and the method of molding a resin product using the mold 201 are the same as those of the first embodiment.

  Next, referring to FIG. 3 and FIG. 4, formation of the high temperature magnetic material layer 211 and the low temperature magnetic material layer 212, and the high temperature magnetic material layer 221 and the low temperature magnetic material layer 222 according to the second embodiment of the present invention, respectively. A method will be described.

  As a method of forming the high temperature magnetic material layer 211 and the low temperature magnetic material layer 212, first, it corresponds to a region where the high temperature magnetic material layer 211 is disposed (region on the X1 side of the recess 10b corresponding to the termination region D in FIG. 4). A shielding plate (not shown) is arranged on the lower surface 210a and the lower surface 210a in contact with the convex portion 220c on the X1 side. Thereafter, the 39Ni-9Cr—Fe alloy is made fine by using the flame spraying apparatus 100 (see FIG. 3) with the wire 101 (see FIG. 3) made of 39Ni-9Cr—Fe alloy arranged at a predetermined position. In this state, it is sprayed on the upper mold 210. As a result, the low temperature magnetic material layer 212 is formed on the lower surface 210 a corresponding to the region other than the termination region D in the molding region C of the upper mold 210.

  Then, after removing a shielding plate (not shown) arranged on the lower surface 210a corresponding to the termination region D in the molding region C, a shielding plate (not shown) is arranged on the lower surface 210a corresponding to a region other than the termination region D in the molding region C. Deploy. After that, by using the flame spraying apparatus 100 with the wire 101 made of 51Ni-11Cr—Fe alloy (see FIG. 3) arranged at a predetermined position, the upper die is obtained in a state where the 51Ni-11Cr—Fe alloy is finely divided. 210 is sprayed. As a result, the high temperature magnetic material layer 211 is formed on the lower surface 210 a corresponding to the terminal region D in the molding region C of the upper mold 210. Finally, a shielding plate (not shown) is removed.

  In addition, as a method of forming the high temperature magnetic material layer 221 and the low temperature magnetic material layer 222, first, an upper surface corresponding to a region where the high temperature magnetic material layer 221 is disposed (region of the recess 220d corresponding to the termination region D in FIG. 4). A shielding plate (not shown) is disposed on 220a and the upper end surface of the convex portion 220c. Thereafter, by using the flame spraying apparatus 100 in a state where the wire 101 made of 39Ni-9Cr-Fe alloy is disposed at a predetermined position, the 39Ni-9Cr-Fe alloy is sprayed onto the lower mold 220 in a state of being finely divided. As a result, the low temperature magnetic material layer 222 is formed on the upper surface 220 a corresponding to the region other than the termination region D in the molding region C of the lower mold 220.

  Then, after removing a shielding plate (not shown) arranged on the upper surface 220a corresponding to the termination region D in the molding region C, a shielding plate (not shown) is arranged on the upper surface 220a corresponding to a region other than the termination region D in the molding region C. To do. Thereafter, by using the flame spraying apparatus 100 with the wire 101 made of 51Ni-11Cr—Fe alloy arranged at a predetermined position, the 51Ni-11Cr—Fe alloy is sprayed onto the lower mold 220 in a state of fine particles. As a result, the high temperature magnetic material layer 221 is formed on the upper surface 220a corresponding to the termination region D in the molding region C of the lower mold 220. Finally, a shielding plate (not shown) is removed.

  In the second embodiment, as described above, the high temperature magnetic material layer 211 is disposed in the region on the X1 side of the recess 10b corresponding to the termination region D, and the high temperature magnetic material layer 221 is disposed in the recess 220d corresponding to the termination region D. By arranging in the region, the high-temperature magnetic material layers 211 and 221 can maintain the temperature of the region in which the raw material hardly flows, such as the termination region D, higher than the other regions in the molding region C, and thus melted. It is possible to suppress the molten resin from staying in the terminal region D where the resin does not flow easily. Thereby, a shaping | molding function can be improved. The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. In the mold 301 according to the third embodiment, a case will be described in which the upper mold 310 and the lower mold 320 are made of a temperature-sensitive magnetic material, unlike the first embodiment.

  First, with reference to FIG. 5, the structure of the metal mold | die 301 by 3rd Embodiment of this invention is demonstrated.

  In the mold 301 according to the third embodiment of the present invention, as shown in FIG. 5, both the upper mold 310 and the lower mold 320 are made of a 39Ni-9Cr—Fe alloy having a Curie temperature of about 145 ° C. Accordingly, the temperature control layer is not separately formed on the upper mold 310 and the lower mold 320. The upper mold 310 and the lower mold 320 are made of Ni—Fe alloy containing Cr, which is made of 30% by mass to 55% by mass Ni, 3% by mass to 15% by mass Cr, unavoidable impurities and Fe. It may be. Moreover, the upper mold | type 310 and the lower mold | type 320 should just be a Ni-Fe alloy which consists of 30 mass% or more and 50 mass% or less of Ni, an unavoidable impurity, and Fe. Further, the lower surface 310a of the upper mold 310 and the upper surface 320a of the lower mold 320 are opposed to each other with a predetermined interval, and the predetermined interval is configured to correspond to the molding region A.

  The upper mold 310 and the lower mold 320 are both configured to have a lower surface 310a and an upper surface 320a having a predetermined shape by deep drawing. The remaining configuration of the third embodiment is similar to that of the aforementioned first embodiment.

  Next, a method for molding a resin product using a mold 301 according to the third embodiment of the present invention will be described with reference to FIG.

  First, an IH coil (not shown) is arranged around the mold 301 so as to contact (contact) the upper mold 310 and the lower mold 320. The entire mold 301 is heated by passing an alternating current through the IH coil.

  Here, in the third embodiment, when the entire mold 301 is heated to about 145 ° C., the 39Ni-9Cr—Fe alloy of the upper mold 310 and the lower mold 320 has a Curie temperature (about 145 ° C.) or higher. Since it is not heated, the entire temperature of the mold 301 is kept in the vicinity of about 145 ° C.

  Thereafter, the molten resin is poured into the molding region A from the injection ports 30 and 31. Then, after a predetermined amount of molten resin is poured into the molding region A, the mold 301 is cooled to cure the resin. Thereafter, the space between the upper mold 310 and the lower mold 320 is widened, and the cured resin is taken out, so that a resin product molded into a shape corresponding to the molding region A is completed.

  In the third embodiment, as described above, the upper mold 310 and the lower mold 320 are both made of a 39Ni-9Cr-Fe alloy having a Curie temperature of about 145 ° C. Since it is not necessary to separately form a temperature-sensitive magnetic material layer on the mold 320, the manufacturing process of the mold 301 can be simplified. The remaining effects of the third embodiment are similar to those of the aforementioned first embodiment.

[Example]
Next, referring to FIGS. 6 to 9, the Curie temperature measurement performed to confirm the effect of the temperature-sensitive magnetic material used in the mold 1 (201, 301) according to the first to third embodiments is described. The thermal expansion coefficient measurement, tensile strength measurement and elongation measurement, and corrosion resistance measurement will be described.

  In the Curie temperature measurement described below, the high temperature magnetic material layers 11 and 21 (211 and 221) and the low temperature magnetic material layers 12 and 22 (212 and 212) used in the mold 1 (201) of the first and second embodiments are used. 222) and Examples 1-4 corresponding to the temperature-sensitive magnetic materials of the upper mold 310 and the lower mold 320 used in the mold 301 of the third embodiment are Ni—Cr—Fe alloys. A temperature-sensitive magnetic material made of a Ni—Fe alloy containing no Cr was used as Examples 5 and 6.

  Specifically, as Example 1, a 51Ni-11Cr—Fe alloy (an alloy composed of 51 mass% Ni, 11 mass% Cr, inevitable impurities, and Fe) was used as a temperature-sensitive magnetic material. In Example 2, a 39Ni-9Cr-Fe alloy (an alloy composed of 39% by mass of Ni, 9% by mass of Cr, inevitable impurities, and Fe) was used as a temperature-sensitive magnetic material. As Example 3, a 52Ni-11Cr—Fe alloy (an alloy composed of 52 mass% Ni, 11 mass% Cr, inevitable impurities, and Fe) was used as a temperature-sensitive magnetic material. As Example 4, a 51Ni-10Cr-Fe alloy (an alloy composed of 51% by mass of Ni, 10% by mass of Cr, inevitable impurities, and Fe) was used as a temperature-sensitive magnetic material.

  Further, as Example 5, a 36Ni-Fe alloy (an alloy composed of 36% by mass of Ni, inevitable impurities and Fe) was used as a temperature-sensitive magnetic material. Further, as Example 6, a 50Ni—Fe alloy (an alloy composed of 50% by mass of Ni, inevitable impurities and Fe) was used as a temperature-sensitive magnetic material.

(Curie temperature measurement)
First, Curie temperature measurement will be described. In this Curie temperature measurement, as shown in FIG. 6, the plate 401 of the temperature-sensitive magnetic material of Examples 1 to 6 was formed into an annular shape having an inner diameter of 6 mm and an outer diameter of 10 mm, respectively. A plurality of temperature sensitive magnetic material plates 401 were laminated inside the concave groove 402 a of the cylindrical sample holder 402. At this time, lamination was performed so that the total thickness of the temperature-sensitive magnetic material plate 401 was 2 mm. Then, the lead wires 403 and 404 were wound around the sample holder 402 on which the temperature sensitive magnetic material plate 401 was arranged, respectively, 20 times. The lead wires 403 and 404 were wound around the sample holder 402 20 times so as to pass through the inner peripheral surface, the lower surface, the outer peripheral surface, and the upper surface of the cylindrical sample holder 402 in this order. Thereby, six test materials 400 corresponding to each of Examples 1 to 6 were produced.

  Thereafter, the lead wire 403 was connected to an AC current generator (not shown), and the lead wire 404 was connected to a BH analyzer (not shown) capable of measuring the amplitude permeability. Then, the test material 400 was installed in a furnace (not shown), and an alternating current magnetic field was applied to the test material 400 by flowing an alternating current having a constant frequency through the lead wire 403. At this time, the amplitude permeability was calculated by a BH analyzer by measuring the current generated in the lead wire 404 in response to the alternating magnetic field.

  In addition, an alternating current having a constant frequency was passed through the lead wire 403, and the amplitude magnetic permeability with respect to a predetermined temperature was calculated by adjusting the temperature of the furnace in which the test material 400 was installed. Accordingly, a graph of amplitude permeability with respect to temperature as shown in FIG. 7 was created for each of the six test materials 400. Then, the temperature at which the amplitude permeability suddenly decreased was determined as the Curie temperature of the temperature-sensitive magnetic material of Examples 1-6.

  As an experimental result of the Curie temperature measurement shown in FIG. 8, the Curie temperature of the 51Ni-11Cr—Fe alloy which is Example 1 was 205 ° C. Further, the Curie temperature of the 39Ni-9Cr-Fe alloy which is Example 2 was 145 ° C. In addition, the Curie temperature of the 52Ni-11Cr—Fe alloy as Example 3 and the Curie temperature of the 51Ni-10Cr—Fe alloy as Example 4 were both 210 ° C. In addition, the Curie temperature of the 36Ni—Fe alloy which is Example 5 was 215 ° C. Moreover, although the Curie temperature of the 50Ni-Fe alloy which is Example 6 was not able to be measured, it is estimated that it is about 450 degreeC.

  Thereby, from the results of Examples 1 to 4, in the Ni—Fe alloy containing Cr, the Curie temperature is set to 145 ° C. or more and 210 ° C. or less by setting the Ni content to 39% by mass or more and 52% or less by mass. It turns out that you can. It has also been found that the Curie temperature can be increased by increasing the Ni content. In addition, it is thought that Curie temperature can be 100 to 450 degreeC by making Ni content into 30 mass% or more and 55 mass% or less in the Ni-Fe alloy containing Cr. Furthermore, from the results of Examples 1 and 4, it was found that the Curie temperature can be increased by reducing the Cr content. Thereby, it is estimated that Curie temperature can be 100 degreeC or more by making content of Cr 15 mass% or less.

  From the results of Example 5, it was found that in the Ni—Fe alloy, the Curie temperature can be increased to 215 ° C. or higher by setting the Ni content to 36 mass% or higher. Moreover, it is estimated from Example 6 that Curie temperature can be made 450 degrees C or less by making content of Ni into 50 mass% or less. In addition, it is thought that Curie temperature can be 100 degreeC or more and 450 degrees C or less by making content of Ni into a Ni-Fe alloy 30 mass% or more and 50 mass% or less.

  In the thermal expansion coefficient measurement, tensile strength measurement and elongation measurement, and corrosion resistance measurement described below, Examples 1 and 5 used in the above Curie temperature measurement were used as the temperature-sensitive magnetic material.

(Measurement of thermal expansion coefficient)
Next, thermal expansion coefficient measurement will be described. In this thermal expansion coefficient measurement, the thermal expansion coefficient of the thermosensitive magnetic material corresponding to Examples 1-6 was calculated | required using the well-known thermomechanical analyzer.

As an experimental result of the measurement of the thermal expansion coefficient shown in FIG. 8, the thermal expansion coefficient of the 51Ni-11Cr—Fe alloy which is Example 1 was 11 × 10 ⁻⁶ / ° C. Moreover, the thermal expansion coefficient of 39Ni-9Cr-Fe alloy which is Example 2 was 9 × 10 ⁻⁶ / ° C. Moreover, the thermal expansion coefficient of the 52Ni-11Cr-Fe alloy which is Example 3 was 11 × 10 ⁻⁶ / ° C. Further, the thermal expansion coefficient of the 51Ni-10Cr-Fe alloy which is Example 4 was 11 × 10 ⁻⁶ / ° C. Moreover, the thermal expansion coefficient of the 36Ni—Fe alloy which is Example 5 was 2 × 10 ⁻⁶ / ° C. Further, the thermal expansion coefficient of the 50Ni—Fe alloy which is Example 6 was 10 × 10 ⁻⁶ / ° C. Thereby, the thermal expansion coefficient of the temperature-sensitive magnetic material of Examples 1, 3 and 4 is about the thermal expansion coefficient (about 11 × 10 ⁻⁶ / ° C. or more and about 12 × 10 10) of carbon steel which is a general material of the mold. It was found that the value was in the vicinity of ⁻⁶ / ° C. or less) (10.3 × 10 ⁻⁶ / ° C. or more and 12.7 × 10 ⁻⁶ / ° C. or less). As a result, by adjusting the composition of Ni and Cr in the Ni—Fe alloy containing Cr, 10.3 × 10 ⁻⁶ / ° C. or more near the value of the thermal expansion coefficient of a general carbon steel is 12.7 ×. It was confirmed that a Ni—Fe alloy containing Cr having a coefficient of thermal expansion of 10 ⁻⁶ / ° C. or less can be formed. Moreover, the value (2 × 10 ⁻⁶ / ° C.) of the thermal expansion coefficient of the temperature-sensitive magnetic material (36Ni—Fe alloy) of Example 5 is the thermal expansion of the temperature-sensitive magnetic material (50Ni—Fe alloy) of Example 6. It became 1/5 of the value of the coefficient (10 × 10 ⁻⁶ / ° C.). Thereby, in the Ni-Fe alloy not containing Cr, when the Ni content is 40% by mass or less, the thermal expansion coefficient is significantly reduced as compared with the case where the Ni content is about 50% by mass, It was found that the value was significantly different from the value of the coefficient of thermal expansion of carbon steel (about 11 × 10 ⁻⁶ / ° C. or more and about 12 × 10 ⁻⁶ / ° C. or less).

(Tensile strength and elongation measurement)
Next, the tensile strength and elongation measurement will be described. In this tensile strength and elongation measurement, using a known tensile tester, the tensile strength based on the load when the temperature-sensitive magnetic material broke and the elongation when broken, corresponding to Examples 1 and 3-6. (The ratio of the extended length of the temperature-sensitive magnetic material after breakage to the length of the temperature-sensitive magnetic material before measurement).

  The experimental results of tensile strength and elongation measurement shown in FIG. 8 include 51Ni-11Cr—Fe alloy as Example 1, 52Ni-11Cr—Fe alloy as Example 3, and 51Ni-10Cr—as Example 4. In any of the Fe alloys, the tensile strength was 520 MPa and the elongation was 40%. Moreover, the tensile strength of the 36Ni-Fe alloy which is Example 5 was 440 MPa, and the elongation was 35%. Further, the tensile strength of the 50Ni—Fe alloy of Example 6 was 550 MPa, and the elongation was 38%. As a result, it was confirmed that any of the temperature-sensitive magnetic materials of Examples 1 to 6 had sufficient workability. Thereby, it turned out that the upper mold | type 310 and lower mold | type 320 (refer FIG. 5) of 3rd Embodiment can be easily formed using the temperature sensitive magnetic material of Examples 1-6. In addition, even when the temperature-sensitive magnetic material layer is formed by pressing the temperature-sensitive magnetic material of Examples 1 to 6 on the upper die and the lower die made of different members such as carbon steel, It has been found that it is possible to press the upper die and the lower die.

(Corrosion resistance measurement)
Next, the corrosion resistance measurement will be described. In this corrosion resistance measurement, a salt spray test based on JIS Z 2371 was performed. Specifically, each of the 51Ni-11Cr—Fe alloy plate material of Example 1 and the 36Ni—Fe alloy plate material of Example 5 has a size of 60 mm (width) × 80 mm (length) × 2 mm (thickness). A test piece was prepared. And the salt water of the density | concentration of 50 g / l was sprayed on the test piece for 2 hours on 35 degreeC conditions. Then, the degree of corrosion was determined based on the JIS rating number of the state of corrosion generated in the test piece.

As an experimental result of the corrosion resistance measurement shown in FIG. 9, the JIS rating number of the 51Ni-11Cr—Fe alloy which is Example 1 was 10 (corrosion area ratio was 0.00%). Moreover, the JIS rating number of the 36Ni-Fe alloy which is Example 5 was 5 (corrosion area ratio was 1.0% to 2.5%). Thus, it was found that the Ni—Fe alloy containing Cr is less susceptible to corrosion than the Ni—Fe alloy containing no Cr and is suitable for use in a mold. This is presumably because Cr forms an oxide film (Cr ₂ O ₃ ) having corrosion resistance on the surface. In addition, it is estimated that the temperature-sensitive magnetic material which has corrosion resistance is obtained by making content of Cr 3 mass% or more.

  The embodiments and examples disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments and examples but by the scope of claims for patent, and includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the said 1st-3rd embodiment, although the example using the molten resin (thermoplastic resin) as a raw material poured into the shaping | molding area | region A (C) of the metal mold | die 1 (201, 301) was shown, this invention Is not limited to this. For example, not a resin but a metal such as Mg may be used as a raw material, and a thermosetting resin may be used as a raw material.

  In the first and second embodiments, the high temperature magnetic material layer 11 (211) and the low temperature magnetic material layer 12 (212) are formed on substantially the entire lower surface 10a (210a) of the upper mold 10 (210). Although an example in which the high temperature magnetic material layer 21 (221) and the low temperature magnetic material layer 22 (222) are formed on substantially the entire upper surface 20a (220a) of the lower mold 20 (220) has been shown, the present invention is not limited to this. . For example, the temperature-sensitive magnetic material layer may be formed only on the lower surface of the upper mold, and the temperature-sensitive magnetic material layer may not be formed on the upper surface of the lower mold. Alternatively, the temperature-sensitive magnetic material layer may be formed only on a part of the lower surface of the upper mold and a part of the upper surface of the lower mold without providing the temperature-sensitive magnetic material layer on substantially the entire surface.

  In the first and second embodiments, the high temperature magnetic material layer 11 (211), the low temperature magnetic material layer 12 (212), the high temperature magnetic material layer 21 (221), and the low temperature magnetic material layer 22 (222) are sprayed. However, the present invention is not limited to this. In the present invention, a temperature-sensitive magnetic material layer is disposed on the lower surface of the upper mold and the upper surface of the lower mold by arranging a plate-shaped temperature-sensitive magnetic material by a method other than thermal spraying such as adhesion or screwing. It may be formed on the upper surface of the mold.

  In the first and second embodiments, the high temperature magnetic material layers 11 and 21 (211 and 221) are made of a 51Ni-11Cr—Fe alloy, and the low temperature magnetic material layers 12 and 22 (212 and 222) are 39Ni-9Cr. In the third embodiment, an example in which the upper die 310 and the lower die 320 are made of a 39Ni-9Cr-Fe alloy is shown. However, the present invention is not limited to this. In the present invention, the high-temperature magnetic material layer and the low-temperature magnetic material layer may include a temperature-sensitive magnetic material having a Curie temperature other than a Ni—Fe alloy containing Cr and a Ni—Fe alloy. At this time, the Curie temperature is preferably 100 ° C. or higher and 450 ° C. or lower.

In the first and second embodiments, the 51Ni-11Cr—Fe alloy of the high temperature magnetic material layers 11 and 21 (211 and 221) and the 39Ni-9Cr— of the low temperature magnetic material layers 12 and 22 (212 and 222) are used. Coefficients of thermal expansion of the upper mold 10 (210) and the lower mold 20 (220), both of which are made of common carbon steel, with Fe alloy (about 11 × 10 ⁻⁶ / ° C. or more and about 12 × 10 ⁻⁶ / ° C. or less) ) Shows an example in which the composition of Ni and Cr is adjusted so as to have a coefficient of thermal expansion of about 10.3 × 10 ⁻⁶ / ° C. or more and about 12.7 × 10 ⁻⁶ / ° C. However, the present invention is not limited to this. In the present invention, the high temperature magnetic material layer and the low temperature magnetic material layer have a thermal expansion coefficient of a value less than about 10.3 × 10 ⁻⁶ / ° C. or a value greater than about 12.7 × 10 ⁻⁶ / ° C. May be.

  In the first and second embodiments described above, the temperature-sensitive magnetic material layer is composed of the high-temperature magnetic material layers 11 and 21 (211 and 221) made of 51Ni-11Cr—Fe alloy and the low temperature made of 39Ni-9Cr—Fe alloy. Although the example which consists of the magnetic material layers 12 and 22 (212 and 222) was shown, this invention is not limited to this. In the present invention, the temperature-sensitive magnetic material layer may be composed of one temperature-sensitive magnetic material, or may be composed of three or more temperature-sensitive magnetic materials.

  In the first embodiment, the high-temperature magnetic material layer 11 (21) is disposed in a substantially central region in the X direction of the concave portion 10b (convex portion 20b) corresponding to the staying region B. In the second embodiment, Although the example in which the high temperature magnetic material layer 211 (221) is disposed in the X1 side region (the region of the recess 220d) of the recess 10b corresponding to the termination region D is shown, the present invention is not limited to this. In the present invention, the high-temperature magnetic material layer may be formed in a region other than the staying region and the terminal region, which are regions where molten resin does not flow easily.

  Moreover, in the said 3rd Embodiment, although the upper mold | type 310 and the lower mold | type 320 showed the example which consists of 39Ni-9Cr-Fe alloy, this invention is not limited to this. In the present invention, either the upper mold or the lower mold may be made of a temperature-sensitive magnetic material, and the other may be made of a material that is not a temperature-sensitive magnetic material.

  Further, in the first and second embodiments, the surfaces of the high temperature magnetic material layer 11 (211) and the low temperature magnetic material layer 12 (212), the high temperature magnetic material layer 21 (221), and the low temperature magnetic material layer 22 (222). While an example in which nothing is formed is shown, in the third embodiment, an example in which nothing is formed on the surfaces of the upper die 310 and the lower die 320 made of a temperature-sensitive magnetic material has been shown. The invention is not limited to this. In the present invention, coating for suppressing adhesion of raw materials such as resin may be performed on the surfaces of the upper mold and the lower mold made of the temperature-sensitive magnetic material layer and the temperature-sensitive magnetic material. For example, when the raw material is a resin, the surface of the upper mold and the lower mold made of the temperature-sensitive magnetic material layer and the temperature-sensitive magnetic material may be coated with an amorphous hard film made of hydrocarbon or the like (DLC coating). However, it may be coated by Cr plating.

  In the first and second embodiments, the method of forming the low temperature magnetic material layers 12 and 22 (212 and 222) before the high temperature magnetic material layers 11 and 21 (211 and 221) has been described. The invention is not limited to this. In the present invention, the high temperature magnetic material layer may be formed before the low temperature magnetic material layer, or the high temperature magnetic material layer and the low temperature magnetic material layer may be formed simultaneously.

  In the first to third embodiments, the example in which the mold 1 (201, 301) includes the upper mold 10 (210, 310) and the lower mold 20 (220, 320) has been shown. Not limited to. In the present invention, the mold may include other mold members in addition to the upper mold and the lower mold.

  In the first and second embodiments, the IH coil 40 is brought into contact (contact) with the high temperature magnetic material layers 11 (211) and 21 (221) and the low temperature magnetic material layers 12 (212) and 22 (222). However, the present invention is not limited to this. In the present invention, as long as the IH coil, the high-temperature magnetic material layer, and the low-temperature magnetic material layer are disposed in the vicinity of each other, they may not be disposed so as to contact each other.

  In the third embodiment, an example in which an IH coil (not shown) is arranged around the mold 301 so as to be in contact with (contact with) the upper mold 310 and the lower mold 320 has been described. Not limited. In the present invention, as long as the IH coil and the upper die and the lower die are arranged in the vicinity of each other, they may not be arranged so as to contact each other.

1, 201, 301 Mold 10, 210 Upper mold (first mold part)
10a, 210a, 310a Lower surface (surface)
11, 21, 211, 221 High temperature magnetic material layer (second temperature control unit, temperature control unit, temperature control layer)
12, 22, 212, 222 Low temperature magnetic material layer (first temperature control unit, temperature control unit, temperature control layer)
20, 220 Lower mold (second mold part)
20a, 220a, 320a Upper surface (surface)
30 Injection port (first opening)
31 Injection port (second opening)
40 IH coil (induction heating coil)
230 Injection port (opening)
310 Upper mold (first mold part, temperature control part)
320 Lower mold (second mold part, temperature control part)
A, C Molding area D Terminal area

Claims (14)

A first mold part;
A second mold part arranged to face the first mold part,
A mold in which a temperature control unit including a temperature-sensitive magnetic material having a Curie temperature is disposed on at least a part of the surface of at least one of the first mold part and the second mold part on the molding region side. The first mold part and the second mold part are made of a metal material having no Curie temperature,
The temperature control unit is a temperature control layer including the temperature-sensitive magnetic material formed on at least a part of the surface of the molding region side of at least one of the first mold part and the second mold part. The mold according to 1.   The mold according to claim 2, wherein the temperature control layer including the temperature-sensitive magnetic material is formed by thermal spraying.   The mold according to any one of claims 1 to 3, wherein the temperature-sensitive magnetic material is made of a Ni-Fe alloy.   The mold according to claim 4, wherein the temperature-sensitive magnetic material is made of a Ni-Fe alloy containing Cr. The first mold part and the second mold part are made of a metal material having no Curie temperature,
The temperature-sensitive magnetic material made of the Ni-Fe alloy containing Cr has a thermal expansion coefficient value of the temperature-sensitive magnetic material of the first mold part and the second mold part in which the temperature control unit is disposed. The mold according to claim 5, wherein the composition is adjusted to be close to the value of the expansion coefficient.   The said temperature control part is arrange | positioned in the area | region corresponding to the said shaping | molding area | region among the surface by the side of the said shaping | molding area | region of the said 1st type | mold part and the surface by the side of the said 2nd shaping | molding part. The mold according to any one of 6. The temperature-sensitive magnetic material includes a first temperature-sensitive magnetic material having a first Curie temperature, and a second temperature-sensitive magnetic material having a second Curie temperature higher than the first Curie temperature,
The temperature control unit includes a first temperature control unit including the first temperature-sensitive magnetic material, and a second temperature control unit including the second temperature-sensitive magnetic material and disposed in a region different from the first temperature control unit. The metal mold | die of any one of Claims 1-7 containing these. The molding region is configured so that the raw material is poured,
The mold according to claim 8, wherein the second temperature control unit is disposed in a region where the raw material hardly flows. A first opening and a second opening for pouring the raw material into the molding region are formed;
The mold according to claim 9, wherein the second temperature control unit is arranged in a region where the raw material poured from the first opening and the raw material poured from the second opening merge. An opening for pouring the raw material into the molding region is formed,
The region other than the portion connected to the opening of the molding region is configured to be a closed region,
10. The mold according to claim 9, wherein the second temperature control unit is disposed in an end region of the closed region on a side opposite to a portion connected to the opening.   The mold according to claim 1, wherein at least one of the first mold part and the second mold part is made of the temperature-sensitive magnetic material.   The induction heating coil which is arrange | positioned in the vicinity of the said temperature control part of the said shaping | molding area | region at the time of the said thermosensitive magnetic material which comprises the said temperature control part, and heats the said temperature control part by induction heating is further provided. The mold according to any one of the above. A temperature-sensitive magnetic material for a mold having a Curie temperature, which is used in a mold including a first mold part and a second mold part disposed so as to face the first mold part,
A temperature-sensitive magnetic material for a mold, which is disposed on at least a part of a surface of at least one of the first mold part and the second mold part on the molding region side.

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