JPH08337685A - Resin composition for molding die, molding die and molding of material with the die - Google Patents

Abstract

PURPOSE: To obtain a resin composition which easily and accurately gives molding die parts through machining without requiring a master model by compounding a thermosetting resin, an inorganic fibrous reinforcing material and an inorganic particulate filler so as to provide specified properties. CONSTITUTION: This composition consists of a themosetting resin (e.g. vinyl ester resin) preferably in an amount of 25-70wt.%, an inorganic fibrous reinforcing material (e.g. potassium titanate whisker) preferably having a mean fiber diameter of at most 5μm, an aspect ratio of at least 3 and a Mohs hardness of at most 6, preferably in an amount of 15-50wt.%, and an inorganic particulate filler (e.g. calcium carbonate) preferably having a mean particle diameter of at most 20μm and a Mohs hardness of at most 6, preferably in an amount of 10-50wt.%, and it has a flexural strength of at least 1,000kgf/cm<2> , a flexural modulus of at least 70,000kgf/cm<2> and machinable properties. The core 2 and cavity 1 of a molding die A are formed from the composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to molding of materials such as resins, rubber compositions and waxes, and more particularly to resin compositions which can be used for producing molds for molding such materials. The present invention relates to a molding die formed by using a composition and a method for molding a material such as a resin by the molding die.

[0002]

2. Description of the Related Art As the product cycle is shortened and the variety of products is reduced in quantity, there is a demand for a molding die having an inexpensive resin core and / or cavity capable of coping with them. It is increasing year by year. For conventional resin cores and / or cavities, a master model of the molded product to be obtained is made of wood, etc., and is used as a "nesting" to inject thermosetting resins such as epoxy resin and urethane resin. It is manufactured by molding into a predetermined shape by a molding method, defoaming and curing.

That is, a master model is indispensable in the production of a molding die having a resin core, a cavity, etc. However, the preparation of the master model requires complicated work. Thermosetting resins such as epoxy resin and urethane resin are liquid at room temperature and are easy to cast, so they are used as the material of the molding die, but prevent the inclusion of air bubbles during casting. In addition to the time required for vacuum defoaming and curing of the resin, curing shrinkage occurs, which makes it difficult to obtain a predetermined dimensional accuracy.

[0004] In order to solve the problem of a mold using a thermosetting resin, it is possible to make a mold using a thermoplastic resin. Generally, a thermoplastic resin has a very high viscosity. Therefore, there is a drawback in that the casting requires pressurization, and even if the pressurization is applied, the details do not enter, and it is not possible to reproduce the fine irregularities of the master model. JP-A-51-1
Japanese Patent Publication No. 19765 discloses a molding die made of a thermoplastic resin containing inorganic fibers such as glass fibers or powdery inorganic materials such as calcium carbonate and river sand, and used for contact pressure molding of reinforced plastics. The molding die is manufactured by injection molding or compression molding, and again a master model for obtaining the molding die is required.

Further, taking resin injection molding as an example, product design and mold design in injection molding have peculiarities different from ordinary part design. That is, even if the designer digitizes the specific shape of the product and completes the product design by drawing it, the resin product is not immediately obtained, and it is necessary to make the product when the product design is completed. A molding tool that is a transfer tool must be designed. And every time a resin product is newly designed, it is necessary to manufacture a new mold. Moreover, since the product manufactured from this mold cannot be reworked by itself, the mold (particularly its core and cavity) requires extremely high precision.

[0006] Conventionally, metal molds have been generally used, but as described above, it is very costly to manufacture a mold that requires extremely high precision using metal. Since it takes a long time, it is a major obstacle in developing resin products. In particular, in the current situation of high-mix low-volume production, compared to the previous era of low-volume mass production,
The number of molds required for trial manufacture, evaluation, products, etc. has increased dramatically, and at the time of developing a new product, design changes, functional improvement, product price reduction, etc. Since it is unavoidable that the mold design is changed, it is strongly desired to reduce the cost required for manufacturing the mold. In addition, the shortening of product cycles has become remarkable, so it is very important to manufacture molds in a short period of time.

[0007] In view of such a situation, a steel material having good workability is used as a mold material, a mold material and parts are standardized, and a cassette type mold in which only a cavity and a core are changed is manufactured. In addition, various methods have been proposed, such as rationalization of die design by a computer. However, each method uses metal as the core material and cavity material of the mold as in the conventional case, and it cannot be said that a sufficient improvement effect is obtained.

Therefore, an object of the present invention is to provide a core, a cavity, etc. for a molding die, which does not require a master model and is machined and finished at a lower cost, a shorter time, a better dimensional accuracy and a higher durability than a conventional one. It is to provide a resin composition for a molding die that can be obtained. Another object of the present invention is to provide a dimensional accuracy by cutting and finishing, and a core and a cavity that can be manufactured at a lower cost than in the past in a short period of time, and have durability, and therefore, the entire structure can be manufactured at that low cost. It is an object of the present invention to provide a molding die which can be manufactured in a short period of time and can meet the requirements in terms of accuracy.

Still another object of the present invention is to provide a molding method for a material such as a resin, which enables a molded product to be obtained accurately and at low cost.

[0010]

As a result of intensive studies to solve the above problems, the present inventor has found that a thermosetting resin composition containing a specific amount of a specific inorganic material has high mechanical strength and excellent cutting. If the composition has processability and does not require a master model, it is possible to cut the molding die core, cavity, etc. at low cost in a short time with high accuracy and high durability with good surface smoothness by cutting. It was found that can be manufactured in.

Further, the present inventor reduces the manufacturing cost of the mold by replacing the material of the cavity and the core, which requires a long time for manufacturing, with a resin in the conventional molding mold, which is particularly expensive. As a result of earnest studies to shorten the period, a thermosetting resin composition containing a specific amount of a specific inorganic material having the above-mentioned excellent machinability and high mechanical strength can be used to form, for example, a rectangular parallelepiped. It has been found that a cavity and a core can be manufactured easily, accurately, inexpensively and in a short time by simply obtaining a molded body having a shape or the like and cutting the molded body.

The cavities and cores made of the resin composition have high mechanical strength, but they are more mechanically strong enough to withstand continuous molding of resin products by, for example, injection molding. In order to impart strength, each of the resin core and the cavity may be used while being held by a holding means that also serves as reinforcement, and with respect to the decrease in durability due to the resin core and the cavity, It has been found that a means for cooling them should be provided.

Based on the above examination, the present invention provides the following resin composition for molding die, molding die and the like. (1) A composition comprising a thermosetting resin, an inorganic fibrous reinforcing material, and an inorganic particulate filler, which has a bending strength of 100.
0 kgf / cm ² or more, flexural modulus 70000 kgf
/ Cm ² or more and a moldable resin composition capable of being cut. (2) A mold having a core and a cavity made of the resin composition for a mold according to the item (1). (3) A molding method characterized in that material molding for obtaining a molded product is performed using the molding die described in the above item (2). (4) Resin core and resin cavity, core holding means for holding the core, cavity holding means for holding the cavity, temperature detecting means for detecting the temperature of at least one of the core and cavity, the core and cavity Means for blowing a cooling gas to the, and the operation of the gas blowing means depending on the temperature detected by the temperature detecting means so that the temperature detected by the temperature detecting means satisfies a predetermined temperature condition. A composition comprising a control unit for controlling, wherein the core and the cavity are composed of a thermosetting resin, an inorganic fibrous reinforcing material, and an inorganic particulate filler, the bending strength is 1000 kgf / cm ² or more, and the bending elastic modulus is 70,000 kgf. / Cm ² or more, a mold formed from a thermosetting resin composition capable of being cut. (5) A resin core and a resin cavity, core holding means for holding the core, and cavity holding means for holding the cavity, wherein the core and the cavity are thermosetting resin, inorganic fibrous reinforcing material, and inorganic particles. Bending strength of 1000 kgf /
A mold having a cm ² or more, a bending elastic modulus of 70,000 kgf / cm ² or more, formed of a machinable thermosetting resin composition, and metal radiating fins attached to the core and the cavity. . (6) A molding method, which comprises molding a material for obtaining a molded product using the molding die according to the above (4) or (5).

In any of the above cases, the resin composition of the present invention for molding dies, especially for cores and cavities, is
Contains thermosetting resin, inorganic fibrous reinforcing material and inorganic particulate filler as essential components, and bending strength of 1000 kgf
/ Cm ² or more, flexural modulus 70000 kgf / cm ²
It is the above, and also cutting is possible. Alternatively, it is desirable that the heat distortion temperature is 180 ° C. or higher so that it can be used for molding a resin material having a relatively high melting point.
When molding a low melting point material such as wax or casting a thermosetting resin such as a two-component curing type epoxy resin or a two-component curing type urethane resin, the heat distortion temperature is 180 ° C.
There is a case where the above does not have to be the case.

The term "machinable" means that a general cutting machine such as a lathe, a drilling machine and a milling machine can perform cutting without significantly damaging the cutting tool. Further, the "heat deformation temperature" is a temperature at which a predetermined deformation occurs under a stress of 18.6 kgf / cm ² according to the method specified in American Society for Testing and Materials (ASTM) D648. Each value of the bending strength and bending elastic modulus is ASTM
It is measured by the method specified in D790.

The thermosetting resin in the resin composition for a molding die according to the present invention contains the inorganic fibrous reinforcing material and inorganic particulate filler, which will be described later, in respective predetermined amounts.
A material capable of exhibiting the mechanical strength and the machinability specified above may be adopted. Such a thermosetting resin can be easily selected by an actual test. Specific examples thereof include unsaturated polyester resin, vinyl ester resin, epoxy resin, allyl resin, phenol resin, urea resin, melamine resin. , Polyamino bismaleimide resin, polytriazine resin, bismaleimide triazine (BT) resin, cross-linked polyamideimide resin, polyvinylphenol / epoxy resin, thermosetting polyimide resin, etc. Among them, economical, molding into block materials From workability, machinability, and toughness during cutting, unsaturated polyester resin, vinyl ester resin, epoxy resin, phenol resin, polyamino bismaleimide resin,
Bismaleimide triazine resins are preferable, and vinyl ester resins and epoxy resins are more preferable. Further, in the present invention, the thermosetting resin also includes a mixture of the above-mentioned various resins with components necessary for curing such as a crosslinking agent and a reaction initiator.

The blending amount of such a thermosetting resin is not particularly limited and can be appropriately selected from a wide range, but it is usually about 25 to 70% by weight of the total amount of the resin composition of the present invention. Two
If it is significantly less than 5% by weight, the moldability and toughness of the resulting composition tend to be deteriorated. On the other hand, if it exceeds 70% by weight, the above specified strength cannot be obtained, and deformation or damage may occur during resin molding.

The inorganic fibrous reinforcing material in the resin composition for a molding die according to the present invention is used to obtain the flexural strength and flexural modulus defined above, or further at a desired heat distortion temperature (for example, 180 ° C. mentioned above). It is used to obtain the above) and to secure the surface smoothness during cutting. As the inorganic fibrous reinforcing material, known materials excluding glass fiber, carbon fiber, rock fiber and the like can be used, and examples thereof include fibrous potassium titanate, fibrous calcium silicate, fibrous magnesium borate and fibrous sulfuric acid. Examples thereof include whiskers such as magnesium, fibrous calcium sulfate, fibrous calcium carbonate, and fibrous aluminum borate.
Among these whiskers, potassium titanate whiskers are particularly recommended. These may be used alone or in combination of two or more.

The inorganic fibrous reinforcing material preferably has an average fiber diameter of 5 μm or less, an aspect ratio of 3 or more and a Mohs hardness of 6 or less. When the average fiber diameter of the inorganic fibrous reinforcing material is significantly larger than 5 μm, the surface smoothness of the mold part obtained from the composition may be deteriorated. If the aspect ratio is significantly smaller than 3, the specified bending strength and bending elastic modulus may not be obtained, or the desired heat deformation temperature (for example, 180 ° C. or higher) may not be obtained. Further, if the Mohs hardness is much higher than 6, the cutting workability is deteriorated and there is a risk of damaging the cutting tool.

The blending amount of the inorganic fibrous reinforcing material is not particularly limited and can be appropriately selected from a wide range, but it is usually about 15 to 50% by weight of the total amount of the resin composition of the present invention. 15
If the content is significantly lower than the weight%, the specified strength may not be obtained. On the other hand, if it exceeds 50% by weight, the moldability of the composition tends to deteriorate. The inorganic particulate filler in the resin composition for a mold according to the present invention is used to further improve the mechanical strength (particularly rigidity), plating adhesion and economy of the composition. Usually, the molding die may be subjected to metal plating in order to improve surface smoothness, durability and releasability. Therefore, it is desired that the plating adhesion be good. As the inorganic particulate filler, known fillers can be used, and examples thereof include calcium carbonate, talc, clay and calcium pyrophosphate. These may be used alone or in combination of two or more. Further, it is also possible to use granular graphite together for the purpose of improving the thermal conductivity.

The particle size of the inorganic particulate filler is not particularly limited, but considering the surface smoothness after cutting, etc.,
Usually average particle size is about 20 μm or less, preferably 10 μm
It is better to set it below the level. The Mohs hardness of the inorganic particulate filler is also not particularly limited, but it is usually about 6 or less. If the Mohs hardness is much larger than about 6 as in the above case, the machinability deteriorates and there is a risk of damaging the cutting tool.

The blending amount of the inorganic particulate filler is not particularly limited and can be appropriately selected from a wide range, but it is usually about 10 to 50% by weight of the total amount of the resin composition of the present invention. If it is significantly less than 10% by weight, the effect of improving the plating adhesion may not be sufficiently exhibited. On the other hand, if it is much more than 50% by weight, the toughness of the present composition tends to be low, the composition becomes very brittle, and the machinability tends to be impaired.

In any case, as a typical example of the resin composition for the molding die (typically for the core and cavity) according to the present invention, a. 25-70 wt% thermosetting resin, b. 15 to 50% by weight of an inorganic fibrous reinforcing material having an average fiber diameter of 5 μm or less, an aspect ratio of 3 or more and a Mohs hardness of 6 or less, and c. Made of 10 to 50% by weight of an inorganic particulate filler having an average particle size of 20 μm or less and a Mohs hardness of 6 or less, a bending strength of 1000 kgf / cm ² or more, a bending elastic modulus of 70000 kgf / cm ² or more, and machinable. The composition may be mentioned. Further, a composition having a heat distortion temperature of 180 ° C. or higher in the above measuring method can be mentioned.

To the resin composition according to the present invention described above, known resins such as a release agent, a coloring agent, a flame retardant, etc. are added within a range that does not lower the above-mentioned mechanical strength and machinability. Agents may be added. In addition, the resin composition of the present invention, according to a known method, for example, a thermosetting resin, an inorganic fibrous reinforcing material and an inorganic particulate filler, and a predetermined amount of other resin additives as needed, ribbon blender It can be produced by pre-mixing with a kneader, a Henschel mixer or the like, and then kneading with a roll, a kneader or a co-kneader. In the present invention, it may be granulated by a crusher or extrusion after such kneading, or it may be used as it is in a bulk form.

The molding die according to the present invention constituted by using the resin composition of the present invention, especially the core and cavity thereof,
For example, transfer molding or compression molding of the composition,
It can be manufactured by molding according to a usual method such as injection molding to obtain a molded product having a desired shape and size, and directly cutting the molded product to form a core and a cavity having a desired shape.

Here, the shape of the molded product is not particularly limited, but a cubic body, a rectangular parallelepiped body, a columnar body and the like can be exemplified. Also, the size of the molded product can be appropriately selected from a wide range according to the shape and size of the molding die to be manufactured, but for example, in the case of a rectangular parallelepiped, the thickness is usually 30 to 5
A flat plate shape having a width of about 0 mm and a width of about 300 to 1000 mm may be used. As it is, or about 300 mm wide,
It may be used by cutting it into a block material having a length of about 300 mm.

For the cutting of the molded product, usual machining methods such as milling, reaming, grinding, laser processing and the like can be adopted. Further, the molded product can be adhered by an adhesive, and for example, it is possible to repair by using a putty made by dispersing fine powder of the composition in an epoxy adhesive and using the putty. In any of the molds according to the present invention, a core and a cavity made of the resin composition of the present invention may be formed with air-cooling or water-cooling channels for the purpose of maintaining an appropriate temperature during molding. Good. Further, the packing of the mold of the present invention may be mounted by processing a resin leak preventing packing groove or the like on the mating surfaces of the core and the cavity. The molding die of the present invention may be metal-plated.

A usual method can be used for producing a molded product using the mold having the core and the cavity made of the resin composition for a mold according to the present invention described in the item (2). For example, by incorporating the molding die into a reinforcing and positioning metal holding structure (mother die) and injecting the material of the molded article according to a suitable molding method,
The desired molded product can be obtained. The molding method is not particularly limited, and a known method can be adopted, and examples thereof include injection molding, cast molding, blow molding and the like.
The mold can also be applied to wax molding.

The molding die of the present invention according to the item (4), that is, a molding die including a temperature detecting means for the core and / or the cavity, a blowing means for blowing a cooling gas to the core and the cavity, and a control section thereof. In the case of the molding die of the present invention described in the item (5), that is, a molding die in which a metal and a fin for heat radiation are attached to the core and the cavity, a molding die for injection molding is given as a typical example. However, in these cases as well, various molding dies applicable to cast molding, blow molding, wax molding and the like are also conceivable.

Further, such a molding die comprises a core and a cavity formed from the resin composition according to the present invention, a holding means for these, a temperature detecting means for the core and / or the cavity, or a heat radiation attached to the core and the cavity. 2 fins, ejection sleeve and /
Alternatively, the same structure as a conventional molding die such as a die provided with a stripper plate, a three-plate die, a split die (a die having an undercut processing mechanism), and an inner surface screw die can be adopted.

In the above-mentioned molding die of the present invention provided with means for blowing a cooling gas to the core and the cavity, the means for blowing the cooling gas is, for example, toward the core and the cavity, and more preferably at a high temperature. Nozzle for blowing a cooling gas toward a high temperature part that is heated to low temperature, high pressure low temperature air (for example, -10 ° C to -55 ° C, 3 to 7 kg /
cm ² ), a device provided with a means for guiding the low-temperature high-pressure air generated by the generator to the nozzle, and the low-temperature high-pressure air when the molding conditions (time, temperature, pressure, etc.) are constant. A compressed air generating device may be used instead of the generating device, or a water adding device for adding water to the compressed air supplied to the nozzle and spraying it in a mist state with the air may be considered. However, regarding the addition of water, it must be decided whether or not to adopt it in consideration of the occurrence of rust in the metal holding structure (mother die) for reinforcement and positioning.

Further, as the temperature detecting means for detecting the temperature of at least one of the core and the cavity in this mold, an infrared radiation thermometer which responds at high speed without contact, a resistance thermometer, a thermocouple thermometer, etc. Can be illustrated. The infrared radiation thermometer is advantageous in terms of repeated temperature control stability and improvement of molding work efficiency. When using a resistance thermometer or thermocouple thermometer, the part where the temperature of the core or cavity is to be measured (for example, the part near the gate of the injection molding core)
It is conceivable to form a hole, a groove or the like into which the thermometer is inserted, and place the thermometer therein. In addition to the above, a heat label (for example, manufactured by Micron Co., Ltd.) may be attached to the portion where the temperature is to be measured. The heat label does not need to be provided with holes or grooves in the core or the cavity, so that the processing is unnecessary, and the reduction in strength due to the provision of holes or grooves is also avoided. The heat label is simple and inexpensive when performing molding work as a preliminary experiment in a laboratory or a laboratory.

The above-mentioned molding die of the present invention in which the core and the cavity are provided with the metal fins for heat radiation is suitable for molding work as a preliminary experiment in a laboratory or a laboratory. In this case, if the fins made of aluminum and / or copper are used, the cooling time becomes longer than the cooling time by the low temperature and high pressure air, but it is suitable for the molding of resin material which is deformed by rapid cooling. ing. Further, when a fin for heat radiation is attached, the core or cavity provided with the fin may be plated with a metal such as nickel or chromium to enhance the heat transferability to the fin for heat radiation.

In the mold of the present invention, the material applicable to the mold is not particularly limited and can be appropriately selected from a wide range. For example, thermoplastic resin, thermosetting resin, rubber composition, mold production for metal casting For wax, wax set in the mold during resin molding and low melting point metal (tin,
Examples thereof include metals or alloys containing bismuth, lead, etc. as main components and having a melting point of about 140 ° C.).

[0035]

[Machinability]

Processing machine: Machining center (Product name: FX-1,
(Matsuura Machinery Co., Ltd.) Machining tool: 3 mm diameter, 6 mm lead, 2-flute general-purpose machining end mill Rotation speed: 6000 rpm Feed rate: 200 mm / min Cutting depth: 0.2 mm [Plating adhesion] The above block Material 3 mm thick, width 50
mm, length 50 mm. Washing: 75 ° C., 10 minutes Washing liquid: Conditioner 1200 (trade name), manufactured by Shipley Far East Inc. Etching: 75 ° C., 20 minutes Etching liquid: H ₂ SO ₄ : CrO ₃ = 1: 2 solution Chemical copper plating: room temperature For 15 minutes Chemical copper plating solution: Coppermix 328L (trade name), product of Shipley Far East Co., Ltd. Plating treatment: Cr plating Further, in order to investigate the basic physical properties of the above block material, 127 mm × 12.7 mm × 6. A 4 mm bending test piece and a heat distortion temperature measuring test piece were cut out by a sample adjuster, and the physical properties were evaluated under the following conditions. Test piece: Thickness 6.4 mm, width 12.7 mm Bending strength and flexural modulus: ASTM D790, Test speed 5 mm / min Heat distortion temperature: ASTM D648, 18.6 kgf / c
The measurement results under m ² are shown in Table 1.

[0036]

[Table 1]

According to Table 1, in Examples 1 to 3, (a)
Flexural strength, flexural modulus and heat distortion temperature are sufficiently high, and the deformation as an injection molding die material shown in Example 7 described later is small, and (b) compression molding property, cutting workability and plating of the block material. It can be seen that both the adhesion is extremely good. On the other hand, in Comparative Example 1 in which calcium carbonate was not mixed, the plating adhesion was poor, and in Comparative Example 2 in which no whiskers were mixed, the bending strength was 1000 kfg.
/ Cm ² or less and the thermal denaturation temperature is 165 ° C., which is low, the (thermal) deformation of the resin mold during injection molding becomes large, and in Comparative Example 3 in which the whisker content exceeds 50% by weight, the block material is compressed. It turns out that molding becomes difficult. (Examples 4 to 6: Resin Composition for Mold) A vinyl ester resin (trade name: Lipoxy H-600, manufactured by Showa Highpolymer Co., Ltd.) was used as a thermosetting resin in the same manner as in Examples 1 to 3. ), Epoxy resin (trade name: Epicoat 82)
5, made by Yuka Shell Epoxy Co., Ltd., bismaleimide triazine-based resin (trade name: BT4480A, manufactured by Mitsubishi Gas Chemical Co., Inc.), as a fibrous inorganic reinforcing material, fibrous calcium silicate (Wollastonite, Product name Wicroll −
10, average fiber diameter 4.5 μm, average fiber length 14 μm, aspect ratio 3, Mohs hardness 4.5, made by Partek Minerals, and talc (talc M) as inorganic particulate filler.
S, average particle size 10 μm, manufactured by Nippon Talc Co., Ltd.
Kneading with a kneader with a compounding composition shown in, and using a press machine, vinyl ester resin at 150 ° C. for 20 minutes, epoxy resin at 180 ° C. for 30 minutes, bismaleimide triazine resin at 170 ° C. for 30 minutes, 200 kgf / Cm ^{2 was} pressed to prepare a block material and a test piece.

[0038]

[Table 2]

From Table 2, a vinyl ester resin, an epoxy resin, a bismaleimide triazine resin as a thermosetting resin, a fibrous calcium silicate as an inorganic fiber reinforcing material, and talc as an inorganic particulate filler are blended according to the present invention. The block materials compounded and molded in the composition all have a bending strength of 1000 kgf / cm ² or more, a bending elastic modulus of 70000 kgf / cm ² or more, and a heat deformation temperature of 180.
It was found that the block material had good compression moldability and machinability at a temperature of not less than 0 ° C, and could be sufficiently used as a mold material. (Example 7: Mold) A box having a width of 26 mm, a length of 55 mm, a depth of 18 mm, and a wall thickness of 1.5 mm is used, using the block material having a thickness of 40 mm, a width of 300 mm, and a length of 300 mm obtained in Example 1. A core and a cavity of a molding die (a core portion and a cavity portion halving die) for molding a shaped molded product were created by an NC processing machine. The core and the cavity were mounted on a mother die (metal holding structure), mounted on an injection molding machine (product name: SG50, mold clamping force 50 tons, manufactured by Sumitomo Heavy Industries, Ltd.), and polyacetal (product name:
Tenac LA501, manufactured by Asahi Kasei Corporation) and AB
An S resin (trade name: Psycholac GSM450, manufactured by Ube Cycon Co., Ltd.) was molded. Table 3 shows the injection molding conditions.
As shown in.

[0040]

[Table 3]

In the molding of polyacetal, the mold was conditioned several times and then molded 50 times in succession. However, the molded product was not deformed or damaged, and a molded product in good condition could be obtained. It was There was no defective product. In addition, when the ABS resin was molded 40 times, a molded product in a good state was obtained without causing mold release defects. (Example 8: Machinability of resin composition for molding die) The resin composition having the material mixing ratio of Example 4 shown in Table 2 above was molded and processed according to the same procedure as in Example 4. 80mm x 50mm x 40 from the block material
mm pieces of wood were cut out. This square wood was cut under the conditions shown in Table 4 below with the following cutting machine and tools, and
A part having the shape shown in FIG. This part has a hemispherical part 100 in the center of the upper part and a pocket part 10 around it.
1, the outer peripheral wall 102 is formed, and the inner and outer upper edges of the top of the wall 102 are rounded. The dimensions of each part shown in the figure are as follows.

L1 = 80 mm, L2 = 70 mm, L3 =
60mm, W1 = 50mm, W2 = 40mm, H1 = 4
0 mm, H2 = 12 mm, D1 = 24 mm. The cutting process required only 30 minutes. A water-soluble cutting oil (trade name: Castor Hisol X, manufactured by Castrol, UK) was used at the time of roughing and removing chips.

Cutting machine: Machining center (trade name: FX-1) Control device; Matsuura System M80 Spindle speed; 30000 rpm High speed control function; C type cornering Both cutting machine and control device are manufactured by Matsuura Machinery Co., Ltd. .

Tool used: R1.5 ball end mill (C
S coating, manufactured by Hitachi Tool Co., Ltd. Tool holder BT40-CTH10-90 (manufactured by MTS Corporation)

[0045]

[Table 4]

In Table 4, "accuracy designation" means a tolerance designation value, and "pick amount" means an amount capable of automatically decelerating the feed speed in accordance with the shape and precision of the processed portion. In the parts obtained by the cutting process, the spherical part and the pocket part had good smoothness, and the polishing process was unnecessary. Regarding the parts, the surface roughness of the pocket portion (center line average roughness Ra) was measured by Surfcom 300B (manufactured by Tokyo Seimitsu Co., Ltd.).
Was measured using Ra = 0.
16 μm, Ra of the side processed surface is 0.48 μm,
It was confirmed to have excellent surface smoothness. On the other hand, when a square bar made of a composition containing the same amount of glass fiber was subjected to the same high-speed cutting process instead of Wicroll-10, the cutting tool was seriously damaged and had to be stopped halfway. In addition, many glass powders were scattered, and the working environment was significantly deteriorated. The square bar of this comparative example could be cut by lowering the rotational speed of the spindle, but had a drawback that the dimensional accuracy and the surface smoothness of the machined surface were lowered.

From this, it is clear that the composition of the present invention has excellent machinability. Next, still another example of the molding die according to the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 is a sectional view of one molding die according to the present invention, and FIG. 4 is a sectional view of another molding die according to the present invention.

The molding die shown in FIG. 3 is an injection molding die.
With the exception of some parts, it has substantially the same structure as the conventional injection mold.
Is. The mold A includes a fixed mold A1 and a movable mold A.
It consists of 2. Fixed side mold A1 is a resin mold
Tee 1 and movable mold A2 are equipped with resin core 2.
It Cavity 1 and core 2 are 1) thermosetting resin
Fat 25 to 70% by weight, 2) Average fiber diameter of 5 μm or less,
Inorganic fibrous strength with a pect ratio of 3 or more and a Mohs hardness of 6 or less
15 to 50% by weight of chemicals, and 3) average particle diameter of 20 μm or less
Lower, inorganic particulate filler 10 to 50 with Mohs hardness of 6 or less
Bending strength is 1000 kg, which is a composition consisting of wt%
f / cm²Above, bending elastic modulus is 70,000 kgf / cm
²The above and the above-mentioned thermosetting with a heat distortion temperature of 180 ° C. or higher
The pellet of the volatile resin composition is extruded into a flat plate and
It is accurately formed by cutting the flat plate.

In the fixed side mold A1, the cavity 1 has a positioning pin 12 protruding from a cavity holder 11.
Is positioned and abutted on the holder. Further, it is fixed to the holder 11 by a holding member 14 which is detachably fixed to the holder 11 with screws 13. This also reinforces the cavity. The cavity holder 11 is provided with a cooling water passage 15 used for adjusting the molding temperature and the like. Holder 11 is fixed side mounting plate 1
It is abutted and fixed to 6.

A sprue bush 17 having a sprue S is fitted to the stationary die A1 and is fixed by a locating ring 18 fixed to a mounting plate 16. In the movable mold A2, the core 2 is positioned by the positioning pin 22 protruding from the core holder 21 and is in contact with the holder. Furthermore, the holder 21
It is fixed to the holder 21 by a holding member 24 that is detachably fixed to the holder with screws 23. This also reinforces the core. The core holder 21 is provided with a cooling water passage 25 for adjusting the molding temperature. Holder 2
1 is abutted and fixed to the receiving plate 26.

In this mold and another mold which will be described later, the shapes and dimensions of the cavity 1 and the core 2 can be changed by appropriately changing the shapes and dimensions of the holding members 14 and 24. It is also possible to reduce the weight and the size of the cavity 1 and the core 2. Here, the material of the holding members 14 and 24 is not particularly limited as long as it has a strength capable of holding the cavity 1 and the core 2, and examples thereof include metals such as steel. Here S15
General structural steel in the range of C to S45C is adopted.

Cavity holder 11 and core holder 21
The cooling water passages 15 and 25 are not necessarily required, and may be omitted if natural cooling is sufficient. On the outside of the receiving plate 26, there is a movable side mounting frame 3 which comprises the plates 31, 32 and a spacer block 33 between the plates.
It has. Positioning pins 34 are provided upright on the frame 3, and the core holder 21 is positioned by being fitted therein. Further, a height reference block 35 that determines the height of the core holder 21 is erected on the plate body 31 of the frame 3 and is in contact with the receiving plate 26. At a position away from the block 35, the pressing rod 36 is erected on the frame plate 32 and penetrates the plate 31 to receive the receiving plate 26.
Is in contact with A spring 360 is attached to the rod 36 to assist the raising operation of the receiving plate 26.

A guide pin 19 is projectingly provided on the fixed side mold A1, and the pin slidably penetrates the guide pin bushes 191 and 192 of the movable side mold A2. The movable mold A2 can be moved toward and away from the fixed mold A1 by being guided by these pins and bushes, and the core 2 can be fitted into and removed from the cavity 1 at the correct position. In the state shown in FIG. 3, the mold is clamped, the cavity 1 and the core 2 are in contact with each other at the parting line P-P, and the sprue S and the runner R are provided between them.
And a gate G is formed.

In the movable side mounting frame 3, a projecting plate 37 is arranged on the frame plate 32, and projecting pins 38 and sprue lock pins 39 are projectingly provided on the projecting plate 37. The pin 38 penetrates the receiving plate 26 and the core holder 21 and reaches the upper surface of the core 2. Sprue lock pin 3
9 also penetrates the receiving plate 26 and the core holder 21, reaches the runner R, and faces the sprue S. The ejection plate 37 is driven by the ejector rod 30 which is a part of the molding machine.

This molding die further comprises a cavity 1
And a device 4 for blowing cooling air to the core 2, which includes a low temperature and high pressure air generator 41, an air blowing nozzle 42 provided in the cavity holder 11, and a pipe 43 for guiding low temperature air from the device 41 to the nozzle 42. It consists of The low-temperature high-pressure air generator 41 employs the Aeromato 90 manufactured by Mekto Co., Ltd., but the Corder 190-75SV manufactured by Sanwa Enterprise Co., Ltd.
Various other types can be adopted. The nozzle 42 has a plurality of air ejection holes for blowing low temperature air to the cavity 1 and the core 2.

This molding die further comprises a cavity 1
And an infrared radiation thermometer 5 (IT2-50 manufactured by Keyence Corporation) for detecting the temperature of the core 2. The thermometer 5 is provided on the core holder 21. Nozzle 42
Is mainly directed to the high temperature parts (typically the gate and its vicinity) of the cavity 1 and the core 2, which are likely to reach high temperatures,
It is desirable to install so that low temperature air can be blown when the mold is opened after molding, and this mold is installed as such. Further, by installing such a nozzle 42, it is possible to cool the molded product at the same time as cooling the cavity and the core when the mold is opened. It is desirable to install the thermometer 5 so that it can detect the temperature of the high temperature part.
This mold is set up like that. However, the nozzle 4
The positions of 2 and the thermometer 5 are not limited to those of this mold.

The temperatures of the cavity 1 and the core 2 detected by the thermometer 5 are input to the controller 6 of the apparatus 4. Control unit 6
Includes a microprocessor, and controls the operation of the device 41 according to the input detected temperature. The control method is such that when the detected temperature to be input becomes equal to or higher than a preset reference temperature, low temperature air is blown from the nozzle 42 to the cavity 1 and the core 2 for a predetermined time (more specifically, the low temperature The high pressure air generator 41) is operated and then stopped. The reference temperature is set lower than the temperatures of the cavity 1 and the core 2 detected by the thermometer 5 when the mold is opened. Therefore, normally, the control unit 6
When the mold is opened, the low temperature air blowing device 4 is instructed to blow low temperature air to the cavity 1 and the core 2. Then, as a result of the air blowing for the time previously determined by experiments or the like, the detected temperature is lowered to a predetermined temperature.
Note that the control unit 6 is not limited to the one that performs such control. For example, when the detected temperature is equal to or higher than the predetermined first reference temperature, the device 4 is activated, and the detected temperature is the first reference temperature. When the temperature drops to a second reference temperature lower than the temperature, various control such as stopping the blowing of the low temperature air may be considered. In short, the temperature detected by the thermometer 5 satisfies a predetermined temperature condition. It is only necessary that the air blowing device 4 can be controlled according to the temperature detected by the thermometer 5.

According to the injection molding die A described above, molding is performed as follows. That is, this mold is incorporated into an injection molding machine (not shown), and an injection nozzle of a melt molding material (not shown) of the molding machine is positioned and connected to the sprue S by the locating ring 18 of the stationary mold A1. The mold A is clamped as shown in FIG. This mold clamping is carried out by the drive unit (not shown) of the molding machine on the movable side mounting frame 3.
Is pushed toward the cavity side, the height reference block 35 and the pressing rod 36 push the receiving plate 26, the core holder 21, and the core 2. The material injected from the molten material injection nozzle passes through the sprue S, the runner R, and the gate G and fills the space formed by the resin cavity 1 and the core 2. After the filled material is cooled and solidified by the cooling water for temperature adjustment that flows through the cooling water passage 15 of the cavity holder 11 and the cooling water passage 25 of the core holder 21, the frame 3 is The core 2 is lowered and the core 2 is lowered, and the cavity 1 and the core 2 are separated from each other at the parting line PP to open the mold. Further, after the mold is opened, the projecting plate 37, the projecting pin 38 and the sprue lock pin 39 supported by the projecting plate 37 are attached to the ejector rod 30.
The molded product that is pushed out by the and normally reaches the core 2 is projected and released from the core 2 by the pin 38, and the sprue S is closed by the sprue lock pin 39.

The control unit 6 cools when the temperature detected by the thermometer 5 becomes equal to or higher than the reference temperature during the molding process, the subsequent opening of the mold, and the release of the molded product. Although it is possible to instruct the air blowing device 4 to eject low temperature air from the nozzle 42 in order to cool the cavity 1 and the core 2, in the present embodiment, the reference temperature is detected immediately after the mold is opened and the cavity 1 and the core 2 are detected. The temperature is set as described above by paying attention to the high temperature thereof, and therefore, in a normal molding operation, cooling air blowing is instructed according to the temperature detected when the mold is opened. As a result, the cavity 1 and the core 2 are rapidly cooled.

After the molded product is taken out, the mold is clamped again and the next molding is performed. At the time of this mold clamping again, the protruding plate 3
The return pin (not shown) supported by 7 is the fixed mold A.
By abutting against a predetermined portion of No. 1 and being pushed back, the projecting pin 38, the sprue lock pin 39, and the projecting plate 37 supporting them are also returned to the initial position. Next, the molding die shown in FIG. 4 will be described.

The molding die B has a split mold structure and is for molding a molded product having holes or undercut portions such as ribs and screw portions on the side surface. The mold B is a mold having substantially the same structure as the mold A, except that the core 2a is adopted instead of the core 2 and the slide core 7 and the slide core backup member 8 are adopted. The core 2a is the same as in the case of the mold A.
It is fixed at 1. The slide core 7 includes an undercut portion 71, is positioned at a predetermined position with respect to the core 2a by the backup member 8, and forms one core together with the core 2a. The slide core 7 is slidably mounted on a core holder 21, and a screw rod 72 is screwed into a screw hole formed in the core, and the screw rod is an electric motor 7.
In 3 the forward rotation and the reverse rotation drive. The motor 73 penetrates the core holder 21 and is supported by the receiving plate 26. The slide core 7 can take a molding position (position shown in FIG. 4) or a releasing position advanced from the molding position by operating the motor 73.

Further, in this mold B, a plate-shaped backup member holder 80 is arranged between the receiving plate 26 and the movable side mounting frame 3, and the backup member 8 can move the core holder 21 and the receiving plate 26 up and down. Penetrates, screw 8
It is fixedly supported by the holder 80 by 1. Support plate 26
A guide pin 82 is projectingly provided on the guide pin 82. The guide pin 82 extends slidably through a guide pin bush 83 provided on the holder 80 and reaches the frame 3. The holder 80 can be moved up and down by being guided by the pin 82. A female screw portion 92 is fixed to the other part of the holder 80, and a screw rod 91 is screwed into the female screw portion 92, and the screw rod is driven to rotate normally and reversely by the electric motor 9. The motor 9 is supported by the frame 3.

The height reference block 35, the protruding pin 38,
The sprue lock pin 39, the pressing rod 36, and the positioning pin 34 all penetrate the backup member holder 80. Therefore, the holder 80 rotates between the receiving plate 26 and the frame 3 by the rotation of the screw rod 91 driven by the motor 9. It can reciprocate, whereby the backup member 8 can take a position for backing up the slide core 7 (a position shown in FIG. 4) or a position lower than the position for allowing the slide core 7 to advance to the releasing position. The pressing rod 36 is fitted with a spring 361 that assists the raising operation of the holder 80.

According to this mold B, molding is performed as follows. That is, similarly to the case of the mold A, it is incorporated in an injection molding machine (not shown), and an injection nozzle of a melt molding material (not shown) of the molding machine is positioned and connected to the sprue S by the locating ring 18 of the stationary mold A1. It Further, the mold is clamped as in the case of the mold A. However, in this mold B, the backup member 8 is moved up to the core 2a and placed at the backup position, and the slide core 7 is advanced until it abuts against this member 8 to assume the molding position shown in FIG. Thus, the molding is performed in the same manner as the case of the mold A.

The molten material injected into the space between the cavity 1 and the core is solidified and brought into a state in which the shape can be maintained, and then, like the case of the mold A, the mold is opened and released, and taken out. . The cavity 1, the core 2a, and the slide core 7 by the cooling air blowing device 4 based on the instruction of the control unit 6
The cooling of (1) and the cooling of the molded product are performed in the same manner as in the case of the mold A.

However, in this mold B, when opening the mold,
First, the backup member holder 8 is operated by operating the motor 9.
0 descends, and the backup member 8 descends accordingly. Then, the motor 73 is operated to move the slide core 7 forward along the core holder 26 and the parting line P-P to the releasing position. Thus, the slide core 7 is released from the undercut portion of the molded product. Subsequently, the entire movable mold A2 is separated (mold open) from the cavity 1.

Experimental Examples 1 and 2 of injection molding using the injection molding die according to the present invention having no undercut portion as shown in FIG. 3 will be described below. The materials of the core and the cavity of the mold used in this experiment are the block materials made from the thermosetting resin composition having the composition of Example 2 by cutting. [Experimental Example 1] 1) Molded product: A peripheral flange a as shown in FIGS.
And a box-formed product with a hole b in the bottom wall (dimension L = 60
mm W = 30mm H = 18mm) 2) Molded material: ABS resin 3) Molding conditions Molding machine used: Sumitomo Nestal 50 ton SG50 Cavity temperature: 45 ℃ Core temperature: 45 ℃ Molding machine nozzle temperature: 235 ℃ Cylinder front temperature : 235 ° C. Cylinder center temperature: 230 ° C. Cylinder rear temperature: 200 ° C. Measurement: 20 cc / shot Injection pressure: 1290 kgf / cm ² Injection time: 1.56 seconds Cooling time by the cooling air blowing device 4: 25 seconds 4) Molding Results By the continuous shots with an injection pressure of 1290 kgf / cm ² and a molding cycle time of 30 seconds, the above-mentioned molded product could be obtained accurately. Further, in this experimental example, the cooling effect of the cavity and the core by blowing the cooling air was also confirmed. 5) Cutting conditions and required machining time of the used resin composition for mold (tool dimension unit is millimeter) Fixed cavity Cavity movable core Tool used: φ2 flat end mill φ2 flat end mill Rotation speed: 3500 rpm 3500 rpm Feed rate: 400- 500mm / min 1260mm / min (by hand) Depth of cut: 2mm 0.02mm Total machining time: 162 minutes Approximately 256 minutes In this way, the cavity and core can be manufactured by cutting only in a relatively short time. It was [Experimental Example 2] 1) Molded product: A molded product having an outer contour shape shown in FIGS. 8 and 9 and having a hollow interior with a substantially uniform wall thickness left (dimension L = 34 mm W = 15mm H = 25.5m
m) 2) Molded part material: wax 3) Molding conditions Molding machine used: Wax injector Cavity temperature: 14 ° C Core temperature: 14 ° C Molding machine nozzle temperature: 90 ° C Injection pressure: 50kgf / cm ² Injection time: 60 seconds 4) Molding result Injection pressure 50kgf / cm ² , molding cycle time 60
The above-mentioned molded product could be obtained with high precision by continuous shots for seconds. 5) Cutting conditions and required processing time (tool dimension unit is millimeters) for the used resin composition for molds. Fixed side cavity is a finishing process with a depth of 6 mm. Is.

Fixed cavity Cavity movable core Tool used: φ2 ball end mill φ2 flat end mill Rotation speed: 3500 rpm 3000 rpm Feed rate: 180 mm / min 180 mm / min Cutting depth: 0.051 mm 0.1 mm Total machining time: About 15 minutes Approximately 5 minutes As described above, the cavity and the core could be manufactured only by cutting in a relatively short time.

Next, a molded product having a circular shape in plan view shown in FIG. 10 (dimension r1 = 9 mm r2 = 6.5 mm H = 2.8 m)
An experimental example 3 for manufacturing a cavity and a core for obtaining m h = 0.95 mm) will be described. [Experimental Example 3] This experimental example shows an example of time for three-dimensional processing. 1) Cutting conditions and required processing time (cavity processing) of the used molding resin composition (of Example 4) Processing content Cutting tool Cutting speed Spindle speed Feed rate Depth of cut (mm / min) ( rpm) (mm / min) (mm) Roughing 3mm diameter 2-flute 80 8500 1500 0.09 Carbide solid end mill 2-flute with a 3mm diameter slope 80 8500 1500 0.09 Carbide solid end mill Bottom 3mm 2-flute 80 8500 1500 0.09 Carbide ball end mill (core processing) Processing details Cutting tool Cutting speed Spindle speed Feed rate Depth of cut (mm / min) (rpm) (mm / min) (mm) Roughing 3mm diameter 2-Flute 80 8500 1500 0.09 (2mm Diameter x Carbide Solid End Mill Width 1.5mm) 2-Flute with 1.5mm Diameter 56 12000 20/300 0.01 Carbide Solid End Mill 2 Flute with 1mm Inclined Slope 37 12000 750 0.03 (Width 2mm groove) Carbide ball end mill R1 groove 2mm diameter 2-flute 75 12000 650 0.02 Carbide ball end mill bottom 2 flute 37 12000 600 0.02 solid carbide end mill finish 1mm diameter From the above experiment, the cavity and core are programmed man-hours,
It was confirmed that the production was completed in about 10 hours including the measurement time.

As described above, since the resin cavity and core according to the present invention can be manufactured by cutting in a relatively short time, it is effective in reducing the man-hours, the delivery time, the cost reduction, etc. of the trial production of a molded product or the production of a small number of parts. I know there is. The molding die of the present invention is not limited to the above-mentioned one, but can take various other modes. For example, as a means for detecting the temperature of at least one of the cavity and the core, as shown in FIG. 11, the core 2 is provided with a temperature detecting means insertion hole 2h so that the temperature of the portion near the gate G can be detected. The temperature detecting end T of the thermocouple thermometer may be inserted here, for example.

As a means for cooling the cavity and the core, as shown in FIG. 12, a metal heat radiation fin F is attached to the core 2b instead of the cooling air blowing device 4 or when the device is adopted. You may. Further, in this example, the core surface is plated with metal in order to enhance the heat transfer effect to the heat radiation fins F. The radiating fins or metal plating can be applied to the cavities as well. When the cooling air blowing device 4 is omitted by providing the heat radiating fins F as described above, the structure of the entire mold is simplified and the cost is reduced, which is suitable for trial manufacture and experiments in a laboratory.

Next, a mold (core portion and cavity portion) durability evaluation experimental example 4 made using the resin composition of the present invention and the resin composition of the present invention were used. Experimental Example 5 of rubber injection molding using a molding die (core portion and cavity portion) and Experimental Example 6 of cast molding using a molding die (core portion and cavity portion) made using the resin composition according to the present invention explain. [Experimental Example 4: Durability of Mold] A block body was made by using the resin composition having the material mixing ratio of Example 4 shown in Table 2 above, and the block body was cut. A molding die (core portion and cavity portion) for injection-molding the molded product shown in (1) was manufactured.

This mold has a film thickness of 20 μm under the following conditions.
Chrome plated. Plating conditions Cleaning: 75 ° C, 10 minutes Cleaning solution: Conditioner 1200 (trade name), Shipley
Far East Co., Ltd. Etching: 75 ° C., 20 minutes Etching solution: H ₂ SO ₄ : CrO ₃ = 1: 2 solution Chemical copper plating: 15 minutes at room temperature Chemical copper plating solution: Coppermix 328L (trade name), Shipley Far East Co., Ltd. Plating treatment: Cr plating Injection molding was performed using this resin mold. The results are shown in Table 5 below.

[0074]

[Table 5]

In Table 5, the details of the injection molding material are as follows. ABS resin: product name Stylak AT-10, manufactured by Asahi Kasei Corporation. OA-20: Resin compound [Otsuka Chemical Co., Ltd.] containing 20% by weight of potassium titanate whiskers (trade name: Timos D, manufactured by Otsuka Chemical Co., Ltd.) in polyacetal resin.
Made].

CT132B: 1 for polycarbonate resin
A resin compound (manufactured by Otsuka Chemical Co., Ltd.) containing 5% by weight of potassium titanate whiskers (trade name: Timos N, Otsuka Chemical Co., Ltd.). From the above results, it can be seen that the resin mold of the present invention can be sufficiently used for injection molding of polycarbonate, which has a particularly high molding temperature among general-purpose engineering plastics.

Observation of the resin molding die of the present invention after completion of the above-mentioned injection molding reveals that there is no noticeable damage and it can be used for mass production of plastic molded products. [Experimental Example 5: Injection molding of rubber] The block material obtained by the same procedure as in Example 1 was machined for the resin composition having the material mixing ratio of Example 1 shown in Table 1 above.
A resin mold C1 shown in FIG. 14 corresponding to the molded product shown in FIG.
0 was produced. Cavity C1 and core C2 of the resin mold
Processing of No. 3 required only 3 minutes 30 seconds and 4 minutes 04 seconds, respectively. In FIG. 14, Rc indicates a sprue. Molded products and molding conditions are as follows. 1) Molded product: Molded product having a circular ring shape in plan view as shown in FIGS. 13A and 13B Dimensions d1 = 42 mm, d2 = 30 mm, d3 = 36 mm P1 = 14 mm, P2 = 8 mm 2) Molded material : Acrylic rubber Product name: Hiker 4000Z (manufactured by Zeon Corporation) 3) Molding conditions: Molding machine used: 35 ton horizontal injection molding machine Clamping force: 160 kgf / cm ² Injection pressure: 140 kgf / cm ² Molding temperature and time: 165 ° C × 150 seconds As a result of molding, an acrylic rubber molded product having a desired shape and dimensions could be obtained. [Experimental Example 6: Casting molding] With respect to the resin composition having the material mixing ratio of Example 3 shown in Table 1 above, the block material obtained by the same procedure as in Example 3 was subjected to the conditions shown in Table 6 below. By cutting below, a resin mold for cast molding corresponding to the following molded product was produced, and cast molding was performed under the following conditions with this mold.

[0078]

[Table 6]

1) Molded product: resin case (housing). Size 90 mm x 60 mm x 25 mm, average thickness 2 mm. 2) Molded material: 2-liquid urethane resin 3) Molding machine: Vacuum casting machine (Product name: Vacuum casting machine 643
2, Nogi Seisakusho Co., Ltd.) 4) Molding pressure: -760 mmHg 5) Curing temperature and time: 60 to 65 ° C, 45 minutes After casting, put in an oven and cure at the above curing temperature and time, A molded product was produced. A molded article having the desired shape and dimensions could be obtained.

[0080]

As described above, according to the present invention, mechanical strength is excellent, machining such as cutting is easy, a master model is not required, and machining finishes more than the conventional simple machining method. Further, it is possible to provide a molding die resin composition that can obtain a molding die component having high dimensional accuracy and high durability, typically a core, a cavity, etc., at low cost.

Further, by using such a resin composition, it is possible to provide a molding die having a resin core and a cavity which can be machined and finished with high dimensional accuracy and has high durability and which is cheaper than conventional ones. Further, the molding die of the present invention can be used for molding various materials and various molding methods, and it is possible to obtain a molded product with high accuracy and at low cost. And, compared to the conventional molding die in which the core and the cavity are formed of a metal material, it can be manufactured at a lower cost in a shorter period of time, can easily respond to design changes, and requires accuracy. Can respond to. In addition, from these things, molded products for mold performance evaluation and sample, especially prior to mass production of molded products,
It can be advantageously applied to the production of molded products of small quantities.

The resin-made cavity and core are held by the cavity holding means and the core holding means so that the cooling gas can be blown to the cavity and the holder, or a mold for radiating the heat is provided in the mold. It is durable enough to withstand the pressure and temperature of time. When the heat deformation temperature of the thermosetting resin composition forming the core and the cavity in the molding die of the present invention is 180 ° C. or higher, molding of a resin or the like having a relatively high melting point can be applied.

In the molding die of the present invention, when the cavity and the core are fixed to the cavity holder and the core holder by the removable holding member, the cavity and the core can be easily removed and the maintainability is improved.
In addition, the cavity and the core can be made smaller and lighter, and rust does not occur, so that the cavity and the core can be easily stored, and the production space and the cost can be reduced. Furthermore, only cavities and cores of different shapes and sizes can be replaced in a cassette manner.

In the molding method of the present invention, by using the molding die of the present invention, a molded product can be obtained accurately and at low cost.

[Brief description of drawings]

FIG. 1 is a plan view of a component obtained by cutting a block material of a resin composition according to the present invention.

2 is a cross-sectional view of the component shown in FIG. 1 taken along line Z1-Z1.

FIG. 3 is a cross-sectional view of an example of a molding die according to the present invention.

FIG. 4 is a cross-sectional view of another example of the molding die according to the present invention.

FIG. 5 is a plan view showing an example of a molded product that is injection molded using the molding die according to the present invention.

6 is a cross-sectional view taken along line XX of FIG.

7 is a cross-sectional view taken along the line YY of FIG.

FIG. 8 is a front view of another example of a molded product injection-molded using the molding die according to the present invention.

9 is a side view of the molded product shown in FIG.

FIG. 10 is a cross-sectional view of yet another example of a molded product that is injection molded using the molding die according to the present invention.

FIG. 11 is a perspective view showing another example of arrangement of temperature detecting means on the core according to the present invention.

FIG. 12 is a perspective view of another example of the core according to the present invention.

FIG. 13 shows still another example of a molded product molded using the molding die according to the present invention, in which (A) is a plan view thereof,
(B) is a sectional view thereof.

14 is a sectional view of a resin mold (cavity and core portion) according to the present invention for obtaining the molded product shown in FIG.

[Explanation of symbols]

 A, B Mold for injection molding A1 Fixed side mold A2 Movable side mold 1 Cavity 2, 2a, 2b Core 11 Cavity holder 13 Screw 14 Holding member 16 Fixed side mounting plate 17 Sprue bush 18 Locating ring 19 Guide pin 191 Guide pin bush S Sprue R Runner G Gate 21 Core holder 23 Screw 24 Holding member 26 Support plate 3 Movable side mounting frame 35 Core holder height reference block 36 Push rod 361 Spring 37 Projecting plate 38 Projecting pin 39 Sprue locking pin 4 Cooling air blowing Attachment device 41 Low-temperature high-pressure air generator 42 Nozzle 43 Piping 5 Thermometer 6 Control unit 7 Slide core 71 Undercut part of core 7 72 Screw rod 73 Electric motor for driving slide core 80 Slide core holder 8 Slide core back -Up member 81 screws 82 slide core guide pin 83 guide pin bushing 9 backup member holder 80 electric motor 91 threaded rod 92 female threaded portion C10 molding resin type drive (cavity and core) C1 cavity C2 cores Rc spool

Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location C08K 7:04 7:18 (72) Inventor Yasuhiko Ichikawa 503-4 Yamada, Isukaichi, Nishitama-gun, Tokyo

Claims (19)

[Claims] 1. A composition comprising a thermosetting resin, an inorganic fibrous reinforcing material and an inorganic particulate filler, which has a bending strength of 1000 kgf / cm ² or more and a bending elastic modulus of 7000.
A resin composition for a molding die, which is 0 kgf / cm ² or more and which can be cut. 2. The resin composition for a mold according to claim 1, which has a heat distortion temperature of 180 ° C. or higher. (1) 25 to 70% by weight of a thermosetting resin, (2) 15 to 50% by weight of an inorganic fibrous reinforcing material having an average fiber diameter of 5 μm or less, an aspect ratio of 3 or more and a Mohs hardness of 6 or less, and 3) 10 to 50% by weight of an inorganic particulate filler having an average particle diameter of 20 μm or less and a Mohs hardness of 6 or less.
The resin composition for a molding die described. 4. The resin composition for a molding die according to claim 3, which has a heat distortion temperature of 180 ° C. or higher. 5. The molding die resin composition according to claim 4, wherein the inorganic fibrous reinforcing material is potassium titanate whiskers. 6. A mold having a core and a cavity made of the resin composition for a mold according to claim 1, 2, 3, 4 or 5. 7. A molding method, characterized in that material molding for obtaining a molded product is performed using the molding die according to claim 6. 8. A resin core and a resin cavity, core holding means for holding the core, cavity holding means for holding the cavity, temperature detecting means for detecting the temperature of at least one of the core and the cavity, and the core. And means for blowing a cooling gas to the cavity, and a means for blowing the gas according to the temperature detected by the temperature detecting means so that the temperature detected by the temperature detecting means satisfies a predetermined temperature condition. A composition comprising a control unit for controlling the operation, wherein the core and the cavity are composed of a thermosetting resin, an inorganic fibrous reinforcing material and an inorganic particulate filler and having a bending strength of 1000 kgf / cm ² or more and a bending elastic modulus. Is 70,000 kgf / cm ² or more, and is formed from a thermosetting resin composition that can be cut. 9. The mold according to claim 8, wherein the heat distortion temperature of the thermosetting resin composition is 180 ° C. or higher. 10. The thermosetting resin composition comprises (1) 25-70% by weight of thermosetting resin, (2) an average fiber diameter of 5 μm or less, an aspect ratio of 3 or more and a Mohs hardness of 6 or less. The molding die according to claim 8, comprising 15 to 50% by weight of the material, and (3) 10 to 50% by weight of the inorganic particulate filler having an average particle diameter of 20 µm or less and a Mohs hardness of 6 or less. 11. The molding die according to claim 10, wherein a heat distortion temperature of the thermosetting resin composition is 180 ° C. or higher. 12. The mold according to claim 11, wherein the inorganic fibrous reinforcing material in the thermosetting resin composition is potassium titanate whiskers. 13. A resin core and a resin cavity, core holding means for holding the core, and cavity holding means for holding the cavity, wherein the core and the cavity are thermosetting resin, inorganic fibrous reinforcing material, and A composition comprising an inorganic particulate filler having a bending strength of 100.
0 kgf / cm ² or more, flexural modulus 70000 kgf
/ Cm ² or more, formed of a thermosetting resin composition capable of being machined, and a metal heat radiation fin is attached to each of the core and the cavity. 14. The mold according to claim 13, wherein a heat distortion temperature of the thermosetting resin composition is 180 ° C. or higher. 15. The thermosetting resin composition comprises (1) 25 to 70% by weight of thermosetting resin, (2) an average fiber diameter of 5 μm or less, an aspect ratio of 3 or more and a Mohs hardness of 6 or less. The molding die according to claim 13, comprising 15 to 50% by weight of the material, and (3) 10 to 50% by weight of the inorganic particulate filler having an average particle size of 20 μm or less and a Mohs hardness of 6 or less. 16. The mold according to claim 15, wherein a heat distortion temperature of the thermosetting resin composition is 180 ° C. or higher. 17. The molding die according to claim 16, wherein the inorganic fibrous reinforcing material in the thermosetting resin composition is potassium titanate whiskers. 18. A molding die for injection molding,
9, 10, 11, 12, 13, 14, 15, 16 or 1
Molding die according to 7. 19. Claims 8, 9, 10, 11, 12, 1
A molding method, characterized in that material molding for obtaining a molded product is performed using the molding die described in 3, 14, 15, 16 or 17.