JP6153762B2 - Molding apparatus and molding method - Google Patents

Description

The present invention relates to a molding apparatus and a molding method including a molding die used for casting, die casting, injection molding, or the like.

  Conventionally, in a technical field using a mold such as casting, die casting, or injection molding, a molded product is manufactured using a mold having various shapes. Usually, a mold used for casting or the like is provided with a cooling space filled with a coolant for cooling a molded object such as high-temperature metal that has flowed into a cavity defined (formed) on the mold surface of the mold. ing.

  The molding die is provided with an extrusion pin for extruding the cooled molded product from the molding die. Some molds are provided with a core pin for forming a hollow core portion in a molded product. In such a mold, pin holes for inserting and sliding the extrusion pin and / or the core pin are opened in the mold surface that defines the cavity of the mold. Since there is a gap (clearance) between the pin hole and the extrusion pin and / or core pin inserted into the pin hole, the extrusion pin and / or core pin can slide. Here, if there is an overlapping space in both the pin hole and the cooling space (in other words, if the pin hole shares a part of the cooling space with the cooling space), the cooling space and the cavity are pinned. The hole and the extrusion pin and / or the core pin communicate with each other via a clearance, and it is assumed that the refrigerant filling the cooling space leaks into the cavity. In order to avoid such a situation, the conventional mold is limited to a structure that does not provide an overlapping space in both the pin hole and the cooling space.

  For example, Patent Document 1 discloses a mold in which an extrusion hole 86 into which the extrusion pin 32 is inserted and a casting hole 58 and 62 into which the casting pin 28 is inserted are formed. The extrusion hole and the cast hole described in the document do not have a space overlapping with the cooling water forward paths 46 and 78 or the cooling water return paths 48 and 80 which are cooling spaces.

JP 2012-125815 A

  As described above, the conventional mold is limited to a structure in which no overlapping space is provided in both the pin hole and the cooling space in order to avoid a situation in which the refrigerant filled in the cooling space leaks into the cavity. That is, there is a limitation on the arrangement of the pin holes and the arrangement of the cooling spaces, and the cooling spaces have to be arranged so as to avoid the positions of the pin holes. As a result, the cooling space cannot be arranged at all desired locations in the mold, and as a result, the cooling function is sufficiently exerted on the molten metal or the like in which the refrigerant filled in the cooling space flows into the cavity. I couldn't say.

An object of this invention is to provide the shaping | molding die which gives freedom degree to arrangement | positioning of a pin hole and a cooling space, and can implement | achieve arrangement | positioning of the cooling space which can fully exhibit a cooling effect | action. Furthermore, it aims at providing the shaping | molding apparatus and the shaping | molding method provided with the shaping | molding die for implement | achieving quick cooling.

The molding apparatus of the present invention for solving the above-mentioned problems shares a mold surface that divides at least a part of the cavity, a cooling space that is spaced apart from the mold surface, and a part of the cooling space. a pin hole opening to the mold surface when the mold body having, and a slidably-mounted push-out pin to the pin hole, the end of the cooling space, the cooling space the cooling medium And a mold having a refrigerant introduction part for introducing the refrigerant into the cooling space and a refrigerant discharge part for discharging the refrigerant from the cooling space, and a suction-type refrigerant introduction / extraction device provided in the refrigerant discharge part for discharging the refrigerant from the cooling space; The cavity is filled with a molding object in a state where the refrigerant is sucked by the refrigerant introduction / extraction device and the cooling space is set to a negative pressure. Contrary to conventional technical common sense, in the present invention, the pin hole shares a part of the cooling space with the cooling space. Therefore, the pin hole and the cooling space can be arranged at a desired location without being affected by the position of each other. Compared with the conventional mold, the degree of freedom of arrangement of the pin holes and the cooling space is remarkably increased and can be arranged at a suitable location, so that the cooling efficiency of the liquid (fluid) to be cooled such as molten metal and The cooling rate can be increased.

  The mold according to the present invention includes a mold body having a mold surface that defines at least a part of a cavity, a cooling space that is spaced apart from the mold surface, and a pin hole that opens in the mold surface, and the pin hole And an extruding pin slidably mounted on the pin, and the pin hole shares a part of the cooling space. The molding die of the present invention is not limited as long as it is used for casting, die casting, injection molding, blow molding or the like. The molding object of the mold of the present invention is not limited to a metal (molten metal) melted at a high temperature, but may be a sol-like resin composition, a synthetic resin plasticized by heating, rubber, a glass material, or the like.

  The mold main body of the mold according to the present invention includes a mold surface that defines at least a part of the cavity, a cooling space that is spaced from the mold surface, and a pin hole that opens in the mold surface. The mold body of the molding die of the present invention may be a part of a stationary mold that is fixed to a molding machine and does not move, or may be a part of a movable mold that can be moved when taking out a molded product. Any type may be used as long as it divides a part of a cavity such as a child.

  The material of the mold body is various metals such as iron, copper and aluminum, alloys such as steel, carbon steel, die steel (high alloy tool steel: SKD), high speed tool steel (high speed steel: SKH), hot tool Other structural materials such as electroformed products, resins, concrete and ceramics may be used as well as materials mainly made of metal such as steel and alloy tool steel. Further, the material of the mold body is not limited to a single material, and a plurality of materials may be used in combination. As an example of combining multiple members, the first member that partitions one surface of the cavity and one surface of the cooling space and the second member that partitions the other surface of the cooling space are brought into close contact with each other at a contact portion that contacts each other. The mold body may be used. The first member in contact with the high-temperature molten metal or the like is preferably composed of a heat-resistant material. Examples of such a material include steel, carbon steel, die steel (high alloy tool steel: SKD), and high speed tool steel ( High speed steel (SKH), hot tool steel, alloy tool steel and the like can be exemplified as preferable examples. Since the second member does not need to be restricted as much as the first member, an inexpensive material may be selected as appropriate. The contact portion where the first member and the second member are in contact with each other preferably has a seal portion for reducing a gap between these members. The seal portion is made of a material used for an O-ring such as silicone rubber, nitrile rubber, styrene rubber, or fluororesin.

  The cavity is a space in the mold that determines the shape of the molded product by allowing the workpiece to flow in, cooling, and fixing. The cavity is usually formed by the mold surfaces of two mold bodies facing each other, but may be formed by using a mold called an insert or a core together. The cavity in the present invention includes all shapes, and includes a concave shape as well as a convex shape.

  The mold surface defines at least a part of the cavity, and the shape of the mold surface determines the shape of the corresponding cavity. The mold surface can be appropriately produced in a desired shape in accordance with a conventional mold production method.

  The cooling space is a space to be filled with a refrigerant, and is provided in the mold main body at a distance from the mold surface. The temperature of the mold main body in contact with the refrigerant filled in the cooling space is transmitted to the mold surface, and cools the high-temperature molding object flowing into the cavity. The distance (d) between the cooling space and the mold surface is a resistance when the temperature of the refrigerant is transmitted to the mold surface. Therefore, the shorter the distance (d), the higher the cooling effect, and the longer the distance (d), the lower the cooling effect. What is necessary is just to design the shape of a cooling space suitably so that it may become a desired distance (d) according to the degree of cooling of the die surface required. In order to enhance the cooling effect, the distance (d) may be significantly shortened. In this case, it is conceivable that the mold surface is deformed by the pressure of the molding acting on the mold surface. In this case, a reinforcing portion for preventing the deformation may be provided in the cooling space. The shape of the reinforcing portion may be a columnar shape or a protruding wall shape. Further, one or a plurality of reinforcing portions may be provided. Furthermore, the reinforcing portion can be formed into a protruding wall shape and function as a guide wall for the refrigerant.

  A single cooling space or a plurality of cooling spaces may be provided. The shape of the cooling space may be appropriately designed so that the high-temperature molding can be efficiently cooled, and a smooth flow of the refrigerant is formed to prevent stagnation of the refrigerant.

  The coolant may be appropriately selected from tap water, cooling water, water such as warm water, and cooled or warmed inorganic and organic liquids and gases. Water is particularly preferable in terms of cooling efficiency, cost, environmental impact, and the like.

At the end of the cooling space, there are a refrigerant introduction part for introducing the refrigerant into the cooling space and a refrigerant discharge part for discharging the refrigerant from the cooling space . There may be one or a plurality of refrigerant introduction parts and / or refrigerant discharge parts. Further, the refrigerant introduction part and / or the refrigerant discharge part can be provided at a position having the highest cooling effect, or can be provided at a position most convenient for introducing and discharging the refrigerant. It is preferable that the refrigerant introduction part and / or the refrigerant discharge part can be easily attached to and detached from the pipe or hose for sending the refrigerant.

Molding apparatus of the present invention, the refrigerant inlet portion and / or the coolant discharge part has a refrigerant inlet and outlet devices, such as a pump for rapidly introducing or discharging a coolant. Moreover, you may arrange | position a refrigerant | coolant introduction / extraction apparatus via the pipe and hose which can be attached or detached to a refrigerant | coolant introduction part and / or a refrigerant | coolant discharge part. The refrigerant introduction / extraction device preferably includes a flow meter and a flow rate control unit and / or a refrigerant thermometer. The flow meter and / or the refrigerant thermometer may not be integrated with the refrigerant introduction / extraction device, and may exist independently. By providing a flow meter, a flow rate control unit, and a refrigerant thermometer, for example, a refrigerant control that detects the temperature of the refrigerant discharged for each cooling space with a refrigerant thermometer and suitably controls the flow rate of the refrigerant according to the detected temperature. Can provide a method.

  The refrigerant introduction / extraction device arranged directly or indirectly in the refrigerant introduction part acts as a pressurized refrigerant introduction / extraction device. When a pressurized refrigerant introduction / extraction device is used, it is possible to introduce the refrigerant all over the minute space in the cooling space and the narrow tube. The refrigerant introduction / extraction device arranged directly or indirectly in the refrigerant discharge portion acts as a suction type refrigerant introduction / extraction device. If a suction-type refrigerant introduction / extraction device is used, impurities such as scale contained in the refrigerant flowing through the cooling space (for example, calcium and scale contained in water) are difficult to adhere to the depressions in the cooling space. The cooling effect can be suitably maintained. Therefore, it is particularly preferable to use a combination of a pressurized type and a suction type refrigerant introducing / extracting device.

By driving the refrigerant introduction / extraction device, the refrigerant can be circulated in the cooling space at a desired flow rate, and the refrigerant can be quickly introduced into the cooling space when necessary, and when the refrigerant is unnecessary in the cooling space. The refrigerant can be discharged quickly. The molding die of the present invention combined with the refrigerant introduction / extraction device can provide a wide variety of molding methods. One example is described below. When introducing an object to be molded such as molten metal into the cavity, no refrigerant is required in the cooling space. If the refrigerant exists in the cooling space, the refrigerant introducing / extracting device is driven to discharge the refrigerant. Thereafter, the molding object is introduced into the cavity, and then the refrigerant introduction / extraction device is driven to introduce the refrigerant into the cooling space. Then, when the object to be molded is cooled and solidified, the refrigerant may be discharged.
Moreover, in this invention, it can shape | mold by filling a to-be-molded object into a cavity in the state which attracted | sucked the refrigerant | coolant by the refrigerant | coolant introduction / extraction apparatus provided in the refrigerant | coolant discharge part, and made the cooling space the negative pressure.

  The extrusion pin is a pin for extruding and removing a molded product obtained by cooling and solidifying a molded product from a molding die, and is slidably attached to a pin hole opened in the die surface. The material of the extrusion pin is various metals such as iron, copper and aluminum, alloys such as steel, carbon steel, die steel (high alloy tool steel: SKD), high speed tool steel (high speed steel: SKH), hot tool There is no particular limitation as long as it has an appropriate strength and an appropriate heat resistance, such as materials mainly made of metal such as steel and alloy tool steel, thermosetting resin, and ceramics. The mold of the present invention may have one extrusion pin or a plurality of extrusion pins.

  The casting pin is a casting pin for forming a hollow casting part in the molded product, and is slidably mounted in a pin hole opened in the mold surface. When a molded object such as a molten metal flows into the cavity, the cast part of the core pin protrudes into the cavity, and after the molded object is cooled and solidified, the core part of the core pin is molded. By sliding the cast pin in the direction of pulling out from the product, a desired cavity (casting location) can be formed inside the molded product. In addition, when a molded object such as molten metal flows into the cavity, the cast-out part of the cast pin is arranged outside the cavity, and after the filling of the molded object into the cavity is completed, the cast pin is slid. The cast part of the cast pin may be moved to protrude into the cavity. Furthermore, for example, when a cast pin is mounted on a movable mold body, the process of pulling the cast part of the cast pin from the molded product is performed by moving the movable mold body (molded product of the mold surface of the movable mold body). May be combined with peeling from the surface). The material of the core pin is various metals such as iron, copper and aluminum, alloys such as steel, carbon steel, die steel (high alloy tool steel: SKD), high speed tool steel (high speed steel: SKH), hot There is no particular limitation as long as the material is mainly a metal such as tool steel or alloy tool steel, or a heat-resistant material such as thermosetting resin or ceramics. The molding die of the present invention may have one core pin or a plurality of core pins. Since the core pin is exposed to a high temperature, a cooling space may be provided inside the core pin to prevent thermal deterioration.

The pin hole opened in the mold surface is for inserting the extrusion pin and / or the core pin so as to be slidable. A pin hole is provided in a direction in which the main pin hole portion extends in the extending direction of the main pin hole portion that opens to the mold surface on one end side and opens to the cooling space on the other end side. And a sub-pin hole opening on the back side facing away. In the molding die by the molding apparatus of the present invention, the pin hole shares a part of the cooling space inside the die body. More specifically, the pin hole shares the space between the main pin hole portion and the sub pin hole portion with the cooling space. In addition, it is not necessary for all of the pin holes existing in the mold by the molding apparatus of the present invention to share a part of the cooling space inside the mold body. The mold by the molding apparatus of the present invention may have a pin hole that does not share a part of the cooling space inside the mold body. In the mold using the molding apparatus of the present invention, the number of pin holes is the same as the number of extrusion pins and core pins.

Conventional molds have been limited in arrangement so that pin holes and cooling space are not shared. However, the mold by the molding apparatus of the present invention eliminates such a restriction and gives freedom to the arrangement of the pin holes and the cooling space. That is, in the present invention, the pin holes and the cooling space are not affected by the positions of each other and are desired. Since it can arrange | position in a location, arrangement | positioning of the cooling space which can fully exhibit a cooling effect | action is realizable. As a result, it is possible to increase the cooling efficiency and cooling rate of the object to be molded such as molten metal.

Further, in the mold using the molding apparatus of the present invention, since the pin hole shares a part of the cooling space inside the mold body, the extrusion pin and / or the cast pin attached to the pin hole is directly It contacts the refrigerant in the cooling space. If it does so, the to-be-molded object in a cavity can be cooled also via an extrusion pin and / or a casting pin. Furthermore, since the extrusion pin and / or the core pin directly contacts the refrigerant in the cooling space, it is possible to suppress thermal expansion and thermal deterioration of the extrusion pin and / or the core pin, A gap (clearance) between the core pin and the pin hole can be maintained within a suitable range. As a result, breakage of the extrusion pin and / or the core pin can be suppressed. In the conventional mold, the extrusion pin and / or the casting pin do not directly come into contact with the refrigerant in the cooling space. Therefore, by stacking shots (molding), the extrusion pin and / or the casting pin is used. Thermal expansion occurred. As a result, in the conventional mold, it is difficult to maintain the clearance (clearance) between the pin holes within a suitable range, and the extrusion pin and / or the core pin are damaged due to clearance disappearance or the like. It was.

  There is a clearance (clearance) between the extrusion pin and / or the core pin and the pin hole. The cavity and the cooling space communicate with each other through the clearance. Here, the size of the clearance is limited to a range in which a molded object such as molten metal does not leak into the cooling passage through the clearance. The size of the clearance may be appropriately set based on the surface tension of the molding to be filled in the cavity so that the molding cannot enter the clearance. The specific width (c) of the clearance is not particularly limited, but preferable ranges are 0 <c ≦ 1.0 mm, 0.01 mm ≦ c ≦ 0.3 mm, and 0.01 mm ≦ c ≦ 0.05 mm. It can be illustrated as The size (c) of the clearance width may be adjusted by preparing a die main body with a different diameter of the pin hole opened in the die surface, or an extrusion pin and / or a die cast attached to the pin hole. The pin may be adjusted by changing to another diameter.

As described above, in the mold by the molding apparatus of the present invention, for example, by providing a refrigerant introduction / extraction device, the presence or absence of the refrigerant in the cooling space can be controlled, so that the refrigerant is introduced into the cooling space only when necessary, That is , the refrigerant can be introduced into the cooling space when the object to be molded such as molten metal is filled in the cavity. In this case, since the cavity is filled with the molding object, the refrigerant introduced into the cooling space does not leak into the cavity through the clearance. On the other hand, since the air can freely move through the clearance, for example, the air in the cavity can escape to the cooling space through the clearance. In other words, since the mold by the molding apparatus of the present invention can easily remove the gas in the cavity, it can be said that the gas hardly remains in the cavity when the molded product is filled. Further, the refrigerant introduction / extraction device is operated when filling the cavity into the cavity to keep the cooling space at a negative pressure, so that the gas in the cavity is more preferably vented. Therefore, it is difficult to form a nest in the molded product manufactured by the mold using the molding apparatus of the present invention.

Further, the refrigerant introduction / extraction device is operated in advance before filling the cavity into the cavity to be molded, and the inside of the cavity is kept at a negative pressure through the cooling space and the clearance, thereby forming by the molding device of the present invention. The mold can also function as part of a vacuum forming device or a vacuum forming device. In this case, as a matter of course, the clearance between the extrusion pin and / or the core pin and the auxiliary pin hole is minimized, and preferably the extrusion pin and / or the core pin and the auxiliary pin are made of a sealing material such as an O-ring. A part of the hole is preferably in close contact. Mold by the molding device of the present invention which functions as a part of the vacuum forming apparatus or vacuum forming apparatus, the vacuum step to maintain the cooling space and the cavity negative pressure operate the refrigerant inlet and outlet device, an object to be molded, such as molten metal cavity A molding process including a filling process for filling the cooling space, a cooling process for introducing a refrigerant into the cooling space to cool the object to be molded in the cavity, a refrigerant discharging process for discharging the refrigerant in the cooling space, and a taking-out process for taking out the cooled molded product from the mold A method for manufacturing a product can be provided. In the take-out step, the extrusion pin slides in the direction of pushing out the molded product from the mold. At this time, the refrigerant introduction / extraction device may be operated in the reverse direction to supply air toward the clearance. If it does so, even if the to-be-molded object (burr) solidified to a part of pin hole adheres a little, a burr | flash can be removed with the pressure of the air which passes clearance.

Further, the molding apparatus of the present invention may include a pressure detection unit for measuring the degree of decompression of the cavity and / or a pressure control unit for controlling the degree of decompression of the cavity. The pressure detection unit and / or the pressure control unit is preferably integrated with the refrigerant introduction / extraction device. When the molding die according to the molding apparatus of the present invention is made to function as a part of the vacuum molding apparatus or the vacuum molding apparatus, the pressure detection unit is the type of workpiece, the clearance between the extrusion pin and / or the core pin and the pin hole. , As well as the pressure reduction degree of the cavity, the pressure at which the object filled in the cavity cannot enter the clearance can be experimentally determined, and the pressure control unit can Before the filling step, the operating conditions of the refrigerant introduction / extraction device can be controlled so that the pressure in the cavity does not fall below the pressure.

In addition, the mold by the molding apparatus of the present invention may be manufactured by directly adopting a method for manufacturing a normal mold, or a conventional method for manufacturing a mold is appropriately improved so as to conform to the gist of the present invention. It may be manufactured.
In addition, a molding method of the present invention for solving the above-described problems includes a mold surface that divides at least a part of a cavity, a cooling space that is spaced from the mold surface, and a part of the cooling space. A die body having a pin hole that opens to the die surface in a shared state, and an extrusion pin and / or a cast pin slidably attached to the pin hole, and is provided at the end of the cooling space. Is provided in the coolant discharge section, and has a coolant introduction section for introducing the coolant into the cooling space and a coolant discharge section for discharging the coolant from the cooling space, and discharges the coolant from the cooling space. A suction-type refrigerant introducing / extracting device, and a molding method for forming a molded body with a molding apparatus, wherein the refrigerant is sucked by the refrigerant introducing / extracting device to keep the cooling space at a negative pressure, With the cooling space held at a negative pressure, A step of filling the Yabiti, characterized by having a.

The molding die according to the molding apparatus of the present invention is characterized in that the pin hole shares a part of the cooling space, and unlike the conventional molding die, there is no restriction on the arrangement of the pin hole and the cooling space, and the pin The hole and the cooling space can be arranged at a desired position without being affected by the position of each other. Therefore, the molding die by the molding apparatus of the present invention can realize the arrangement of the cooling space that can sufficiently exhibit the cooling action. As a result, it is possible to increase the cooling efficiency and cooling rate of the object to be molded such as molten metal.

1 is a cross-sectional view of a molding die of Example 1. FIG. 6 is a cross-sectional view of a molding die of Example 2. FIG.

  Hereinafter, the present invention will be described in more detail through examples. These examples are for explaining the present invention more specifically, and the scope of the present invention is not limited to these examples.

Example 1
FIG. 1 shows a cross-sectional view of the mold of Example 1 using the molding apparatus of the present invention.

The mold of Example 1 is a fixed mold that is fixed to the molding apparatus and does not move. As shown in FIG. 1, the mold surface 2 that defines a part of the cavity 1 and the distance (d ) Are slidably mounted in the pin hole 40 and the die body 5 of high alloy tool steel (SKD61) having the cooling space 3 provided at a distance of (2) and the pin hole 40 opened in the die surface 2. It has an extrusion pin 6 of high alloy tool steel (SKD61). The mold surface 2 defines the cavity 1, and the shape of the mold surface 2 determines the shape of the cavity 1 and thus the shape of the molded product. The cooling space 3 is provided inside the mold body 5 with a distance (d) from the mold surface 2. The surface of the cooling space 3 on the mold surface 2 side has a shape that roughly matches the shape of the mold surface 2. When observed from the direction of the mold surface 2, the pin hole 40 is circular. The pin hole 40 is provided in the extending direction of the main pin hole 41 and the main pin hole 41 that opens to the mold surface 2 on one end side and opens to the cooling space 3 on the other end side. The end side has a mold surface 2 and a sub-pin hole portion 42 opened in the back surface 7 facing away. A cylindrical portion of the pin hole 40 excluding the main pin hole portion 41 and the sub pin hole portion 42 is a place shared with the cooling space 3. There is a clearance between the push pin 6 slidably mounted in the pin hole 40 and the pin hole 40 (the main pin hole portion 41 and the sub pin hole portion 42). The cavity 1 and the cooling space 3 communicate with each other through a clearance between the extrusion pin 6 and the main pin hole 41, and the size of the clearance is a molding such as a molten metal filled in the cavity 1. Is limited to such a range that does not leak into the cooling passage 3 through the clearance. The extrusion pin 6 has a cylindrical shape, and when the object to be molded such as molten metal is filled in the cavity 1, the upper circular upper surface of the extrusion pin 6 defines a part of the cavity 1 in the state shown in FIG. 1. To do. And after the to-be-molded object with which the cavity 1 was filled is solidified, the extrusion pin 6 slides in the direction which extrudes the solidified molded article from a shaping | molding die.

Casting using the molding apparatus of Example 1 of the present invention will be described in detail. The following casting corresponds to the reference example.

  First, molten aluminum is filled into the cavity 1 of the mold in the state shown in FIG. The cooling space 3 is operated by operating a refrigerant introduction / extraction device (vacuum pump: not shown) arranged via a hose connected to a refrigerant discharge part (not shown) located at the end of the cooling space 3. A little negative pressure. For this reason, the air remaining in the cavity 1 filled with the molten aluminum moves to the cooling space 3 through the clearance between the extrusion pin 6 and the main pin hole 41. When the filling of the molten aluminum into the cavity 1 is completed, cooling water is introduced into the cooling space 3 from a refrigerant introduction portion (not shown) located at the end of the cooling space 3. The cooling water introduced into the cooling space 3 lowers the surface of the mold body 5 in contact with the cooling water that defines the cooling space 3. The low temperature is transmitted to the mold surface 2 through a distance (d) between the cooling space 3 and the mold surface 2, and cools the high-temperature molten aluminum flowing into the cavity 1.

  By performing cooling while operating the refrigerant introduction / extraction device, new cooling water is always supplied to the cooling space 3. When the predetermined cooling time has elapsed and solidification of the aluminum in the cavity 1 has been completed, the introduction of the cooling water is stopped in the refrigerant introduction part and the cooling space 3 is opened (for example, the refrigerant introduction part is connected to the outside). The cooling water in the cooling space is quickly discharged from the refrigerant discharge portion. Then, the extruded pin 6 slides in the direction of extruding the solidified aluminum from the mold, so that the aluminum of the molded product is detached from the mold surface 2 and an aluminum molded product molded into a desired mold is obtained.

(Example 2)
FIG. 2 shows a cross-sectional view of a mold using the molding apparatus of Example 2 of the present invention.

  Since the mold according to the second embodiment is basically based on the mold according to the first embodiment, the following description will be made on the differences from the first embodiment.

  The mold body 5 according to the second embodiment includes a mold member 2 that divides the cavity 1 and a first member 51 that divides one surface of the cooling space 3, and a second member 52 that divides the other surface of the cooling space 3. The contact portion 53 is in close contact with each other. The first member 51 in contact with the molten aluminum is made of high alloy tool steel (SKD61) which is a heat resistant material. The second member 52 is made of inexpensive iron. For this reason, it is advantageous in terms of cost. Further, the shape of the cooling space 3 inside the mold body 5 is determined by the surface shapes of the first member 51 and the second member 52. Therefore, the work for making the cooling space 3 into a desired shape is sufficient if the surface shape of the first member 51 and / or the second member 52 is processed. The shape of the cooling space 3 can be formed or changed easily. That is, it is convenient to change the shape of the cooling space 3 inside the mold body 5 to a desired shape or to change the shape of the cooling space 3 to a suitable one.

  Further, the mold of Example 2 has a high-alloy tool steel (SKD61) cast pin 8 slidably mounted in the pin hole 43. The casting pin 8 includes a cylindrical casting part 81 for forming a cylindrical casting part in the molded product, a cylindrical casting pin body 82 integrated with the casting part 81, and a casting pin body. It comprises a cylindrical pin head 83 that is coupled to the part 82 and has a larger diameter than the core part 82. When a molded object such as a molten metal flows into the cavity 1, the cast portion 81 of the core pin 8 protrudes into the cavity, and after the molded object is cooled and solidified, the cast pin 8 is cast. By sliding the core pin 8 in the direction in which the punched portion 81 is pulled out from the molded product, a desired cavity (casting location) can be formed inside the molded product.

  When observed from the direction of the mold surface 2, the pin hole 43 of the core pin 8 has a circular shape. The pin hole 43 is provided in the extending direction of the main pin hole portion 44 that opens to the mold surface 2 on one end side and opens to the cooling space 3 on the other end side, and one end side opens to the cooling space 3. The end side has a mold surface 2 and a sub-pin hole 45 opening in the back surface 7 facing away. A cylindrical portion of the pin hole 43 excluding the main pin hole portion 44 and the sub pin hole portion 45 is a place shared with the cooling space 3. There is a clearance between the core pin 8 slidably mounted in the pin hole 43 and the pin hole 43 (the main pin hole portion 44 and the sub pin hole portion 45). The cavity 1 and the cooling space 3 communicate with each other through a clearance between the core pin 8 and the main pin hole 44. The size of the clearance is to be molded such as a molten metal filled in the cavity 1. It is limited to a range in which an object does not leak into the cooling passage 3 through the clearance.

Casting using the molding apparatus of Example 2 of the present invention will be described in detail. The following casting corresponds to the reference example.

  First, molten aluminum is filled into the cavity 1 of the mold in the state shown in FIG. The cooling space 3 is operated by operating a refrigerant introduction / extraction device (vacuum pump: not shown) arranged via a hose connected to a refrigerant discharge part (not shown) located at the end of the cooling space 3. A little negative pressure. For this reason, the air remaining in the cavity 1 filled with the molten aluminum passes through the clearance between the extrusion pin 6 and the main pin hole 41 or the clearance between the core pin 8 and the main pin hole 44. To the cooling space 3. When the filling of the molten aluminum into the cavity 1 is completed, cooling water is introduced into the cooling space 3 from a refrigerant introduction portion (not shown) located at the end of the cooling space 3. The cooling water introduced into the cooling space 3 lowers the surface of the mold body 5 (first member 51) in contact with the cooling water that defines the cooling space 3 at a low temperature. The low temperature is transmitted to the mold surface 2 through a distance (d) between the cooling space 3 and the mold surface 2, and cools the high-temperature molten aluminum flowing into the cavity 1.

  By performing cooling while operating the refrigerant introduction / extraction device, new cooling water is always supplied to the cooling space 3. When the predetermined cooling time has elapsed and solidification of the aluminum in the cavity 1 has been completed, the introduction of the cooling water is stopped in the refrigerant introduction part and the cooling space 3 is opened (for example, the refrigerant introduction part is connected to the outside). The cooling water in the cooling space is quickly discharged from the refrigerant discharge portion. Then, the cylindrical pin 8 is slid in the direction in which the cast portion 81 of the cast pin 8 is pulled out from the molded product, thereby forming a cylindrical cavity inside the molded product. Thereafter, the extruded pin 6 slides in the direction of extruding the solidified aluminum from the mold, so that the aluminum of the molded product is detached from the mold surface 2 and the aluminum molded into a desired mold is obtained.

  1 is a cavity, 2 is a mold surface, 3 is a cooling space, 40 and 43 are pin holes, 41 and 44 are main pin holes, 42 and 45 are sub-pin holes, 5 is a mold body, 51 is a first member, 52 is a second member, 53 is a joint, 6 is an extrusion pin, 7 is a back surface, 8 is a cast pin, 81 is a cast portion, 82 is a cast pin main body, and 83 is a cast pin head. d indicates the distance between the mold surface 2 and the cooling space 3.

Claims (6)

A mold surface that divides at least a part of the cavity, a cooling space provided at a distance from the mold surface, and a pin hole that opens to the mold surface while sharing a part of the cooling space. and type body, a pin slidably mounted a push-out pin and / or cast punching in the pin holes, provided with, on the end of the cooling space, the refrigerant inlet portion and said introducing the refrigerant into the cooling space A mold having a refrigerant discharge part for discharging the refrigerant from the cooling space ;
A suction-type refrigerant introducing / extracting device that is provided in the refrigerant discharge section and discharges the refrigerant from the cooling space;
Have
A molding apparatus that fills the cavity with a molding object in a state where the refrigerant is sucked by the refrigerant introduction / extraction device and the cooling space is set to a negative pressure. The pin hole is provided in a direction in which the main pin hole portion is opened in the mold surface on one end side and opened in the cooling space on the other end side, and the main pin hole portion extends in the one end side. The molding apparatus according to claim 1, further comprising: a secondary pin hole opening in the mold surface and a back surface facing away from the mold surface. The molding apparatus according to claim 1, wherein the molding apparatus has a plurality of the pin holes. A mold surface that divides at least a part of the cavity, a cooling space provided at a distance from the mold surface, and a pin hole that opens to the mold surface while sharing a part of the cooling space. A mold main body, and an extrusion pin and / or a casting pin slidably mounted in the pin hole, and at the end of the cooling space, a refrigerant introduction part for introducing the refrigerant into the cooling space, and the A mold having a refrigerant discharge part for discharging the refrigerant from the cooling space;
A suction-type refrigerant introducing / extracting device that is provided in the refrigerant discharge section and discharges the refrigerant from the cooling space;
A molding method for molding a molded body with a molding apparatus having:
A step of sucking the refrigerant by the refrigerant introducing / extracting device and keeping the cooling space at a negative pressure;
Filling the cavity with the molding in a state where the cooling space is maintained at a negative pressure;
A molding method characterized by comprising: The pin hole is provided in a direction in which the main pin hole portion is opened in the mold surface on one end side and opened in the cooling space on the other end side, and the main pin hole portion extends in the one end side. The molding method according to claim 4, further comprising: a sub-pin hole opening on the mold surface and a back surface facing away from the mold surface. The shaping | molding method of Claim 4 or 5 which has multiple said pin holes.

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