JPH11314148A - Method for injection-forming metallic material using hotrunner die device and hot-runner die device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the leakage of semi-molten metal from the tip part of a nozzle by forming a metal without reducing the cross sectional area of the tip part of the hot nozzle. SOLUTION: This forming method is composed of a stage, in which the metal in the semi-molten state injected from an injection-forming machine is filled into a cavity 11 in dies 2, 6 through the hot hot nozzle 4, a stage, in which the dies 2, 6 are cooled until the filled metal in the semi-molten state therein becomes in a prescribed semi-solidified state, a stage, in which a part of the metal in the semi-solidified state in the cavity 11 is introduced into the tip part of the hot nozzle 4, a stage, in which the dies 2, 6 are cooled until the metal in the semi-solidified state in the cavity 11 perfectly solidifies and on the other hand, the metal in the tip part is kept in the semi-solidified state, a stage, in which the semisolidified metal in the tip part and the cooling solidify- formed metal are separated by parting the hot nozzle 4 from the die 2, 6, and a stage, in which the formed metal is taken out from the dies.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for injection molding a metal material using a hot runner mold apparatus and a hot runner mold apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, a so-called cold runner mold is known for injection-molding a metal. In this cold runner mold, molten metal in a passage (spool portion, runner portion) leading to a cavity is used. The flow resistance of the material is large, and spools and runners are formed, so that much waste material is generated. For this reason, Japanese Unexamined Patent Publication No. Hei 9-85416 discloses an attempt to improve a plastic hot runner mold and use it for metal injection molding. In other words, if a conventional hot runner mold for plastic (using an externally heated hot nozzle using a band heater or the like) is used as it is, the mold is cooled after injection molding, and the hot nozzle is retracted from the mold. When trying to take out the product, the metal kept in a molten state in the nozzle tip (gate portion) leaks out of the nozzle tip, so the cross-sectional area of the nozzle tip is reduced in the above publication. Thus, by making the flow resistance of the molten metal material passing through the nozzle tip higher than the flow resistance of the molten metal passing through the manifold, leakage of the molten metal from the nozzle tip is prevented.

[0003]

Problems to be Solved by the Invention
The improvement in the gazette is to reduce the cross-sectional area of the nozzle tip, so that the pressure loss increases, which decreases the injection pressure to the cavity, resulting in poor molding, and is not suitable for molding large products. It is. In addition, the filling time into the mold becomes longer and the molding cycle becomes longer. In addition, there is a problem that leakage of molten metal from the gate cannot be completely prevented, regardless of whether it can be ignored.

[0004]

In order to solve the above-mentioned problems, the invention of claim 1 of the present application is a method for injection molding of a metal material using a hot runner mold device, and a) injection from a injection molding machine. Filling the semi-molten metal into the cavity of the mold through a hot nozzle; and b) cooling the mold until the semi-molten metal filled in the cavity becomes a predetermined semi-solid state. C) introducing a portion of the semi-solid metal in the cavity into the tip of the hot nozzle; and d) completely removing the mold from the semi-solid metal in the cavity. E) maintaining the metal in the tip in a semi-solid state while cooling to solidification; and e) separating the semi-solid metal in the tip and the cooled and solidified metal by separating the hot nozzle from the mold. And separate With that step and the steps of retrieving f) forming metal from the mold, the. In the invention of claim 1, in step c), a semi-solidified metal material is introduced from the cavity into the tip portion,
In the step d), the metal in the tip is maintained in a semi-solid state even after the metal in the cavity is completely cooled and solidified.
When the hot nozzle is separated from the mold in the step e), the product cooled and solidified in the cavity when the hot nozzle is separated from the mold is separated at the interface with the semi-solid state metal in the tip portion, and is semi-solidified. State metal remains in the tip and closes it. In order to perform molding again, the hot nozzle is heated to semi-solidify the semi-solid metal material in the tip. As a result, the closed state of the leading end is released, and the cavity can be filled together with the material newly supplied from the injection molding machine to the hot nozzle. That is, according to the first aspect of the present invention, the tip portion is covered with the semi-solid metal material, so that leakage of the metal material from the tip portion can be reliably prevented.
In addition, since a large-diameter gate can be adopted, molding defects can be prevented, large products can be effectively molded, and high-cycle molding can be performed. Further, in the invention according to claim 2, the step c) is performed by reducing the volume in the cavity from the first volume to a second volume smaller than the first volume by a predetermined amount, This second volume corresponds to the required product volume. That is, the first volume is the second volume
The volume of the product, i.e. the volume of the product, is a volume that allows for the amount of metal introduced into the tip portion. With such a setting, the method of claim 1 can be performed without affecting the shape and dimensions of the desired molded product. . According to a third aspect of the present invention, a metal in a semi-molten state injected from an injection molding machine is filled into a cavity of a mold through a hot nozzle, and the molded metal cooled and solidified in the cavity is taken out from the mold. ,
A hot runner mold apparatus, wherein when a metal filled in a cavity of the mold is in a predetermined semi-solid state, a predetermined amount of the metal is introduced into a tip portion of the hot nozzle. It is a hot runner mold device having means. The invention according to claim 3 is an apparatus for carrying out the invention according to the method according to claim 1, wherein a part of the metal filled in the cavity of the mold when the metal is in a predetermined semi-solidified state is removed. By providing the introduction means for introducing the hot nozzle into the tip, the hot metal separated from the mold by the semi-solid state metal introduced into the tip as described in relation to claim 1 is provided. The tip of the nozzle can be closed. Therefore, similarly to the first aspect, it is possible to reliably prevent the metal material from leaking from the front end. In addition, since a large-diameter gate can be adopted, molding defects can be prevented, large products can be effectively molded, and high-cycle molding can be performed. According to a fourth aspect of the present invention, in the third aspect, the introduction means has a piston having a variable volume of a passage chamber provided in the mold in communication with the cavity, and an actuator for driving the piston. Configuration. With such a configuration, the semi-solid state metal according to claim 1 can be easily introduced into the distal end portion by moving the piston by the actuator, and by adjusting the stroke of the piston,
It is possible to obtain an optimum introduction amount according to the inner diameter of the tip portion and the like. According to a fifth aspect of the present invention, in the fourth aspect, the piston provides the communication chamber with a first position where the volume of the communication chamber is substantially zero and a volume corresponding to an amount of semi-solidified metal to be introduced into the distal end portion. This is a configuration that is moved to and from a second position. With such a configuration, by maintaining the first position of the piston from a semi-solid state to a state in which the metal in the cavity is completely solidified, it is possible to form a molded product without a protrusion due to the presence of the communication chamber or a depression due to the piston. You can get
This is because the end face shape facing the cavity of the piston is formed so as to be flush with the inner surface of the cavity, and the seal between the piston and the inner wall of the communication chamber is completed, so that better quality is achieved. Products can be obtained. A sixth aspect of the present invention is the hot runner mold apparatus according to any of the third to fifth aspects, wherein the hot nozzle is provided with means for holding the semi-solid state metal in the tip portion. By providing such a holding means, the product cooled and solidified in the cavity when the hot nozzle is separated from the mold and the metal in the semi-solid state at the tip and the semi-solid state after the separation are separated. It is possible to reliably hold the metal in the tip portion. According to a seventh aspect of the present invention, in the third aspect, the hot nozzle has a main body having a front end portion and a base portion for attachment to a fixed portion. A pair of split grooves formed in the longitudinal direction is formed over the distal end portion, and the distal end portion is configured to mainly generate heat by applying a voltage between the main body portions separated by the split groove via the base portion. Hot runner mold equipment. By using a nozzle with such a configuration as a hot nozzle, accurate and quick temperature control of the nozzle tip is possible, so that semi-solidified metal introduced into the tip can be separated from cooling products. In addition, the temperature can be set to an optimum temperature suitable for closing the tip portion after that, and when the molding is restarted, it is quickly melted, so that the semi-molten metal can be smoothly filled into the cavity. Therefore, the tip portion can be reliably closed by the semi-solidified metal, and the molding cycle can be further shortened.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view, and FIG.
A hot runner mold device shown in a line cross section includes a fixed-side mounting plate 1 as a fixed-side member, a fixed mold 2 fixed to the fixed-side mounting plate 1 by a bolt (not shown) via a spacer, and a fixed-side mounting plate 1. It has a manifold 3 fixed to the fixed-side mounting plate 1 in a state interposed between the fixed die 2 and the fixed die 2, and a pair of hot nozzles 4, 4 fixed to the manifold 3 by bolts (not shown). Also, as a movable side member,
The movable-side mounting plate 5, the movable die 6 fixed to the movable-side mounting plate 5 by bolts (not shown) via spacers, and left and right supported by the movable die 6 by guide pins (not shown) so as to be movable in the left-right direction. Ejector plates 7 and 8 are provided. A plurality of ejector pins 9 to 9 (only two are shown in the figure) are provided on these ejector plates 7 and 8.
And a plurality of return pins 10 to 10 (see FIG. 2). In addition, a pair of cavities 11 and 11 are formed between the fixed mold 2 and the movable mold 6.

[0006] The fixed-side member will be described in more detail. The manifold 3 has a protrusion 3a at the center on the left side thereof, and the protrusion 3a is inserted into a corresponding insertion hole 1a provided in the fixed-side mounting plate 1. Have been. Inside the manifold 3, there is formed a flow path 12 whose one end is open at the tip of the projection 3 a, and this flow path 12 is formed by the manifold 3.
Inside, it branches into a pair of branch paths 12a, 12a in a forked shape,
These branch paths 12a, 12a are respectively opened at the right end face of the manifold 3. Further, an opening peripheral edge 12b at the tip of the projection 3a of the flow path 12 is formed in a partially spherical shape as shown in the figure, and forms a contact surface with a nozzle of an injection molding machine (not shown). Further, rod-shaped heaters 13, 13 for heating and maintaining the manifold 3 at a predetermined temperature are embedded in the manifold 3.

Each hot nozzle 4 has a cylindrical shape forming a flow path 14 therein, and is attached to the manifold 3 at a position where one end of the flow path 14 communicates with the corresponding branch path 12a. Each of the hot nozzles 4 is received in a corresponding receiving hole 2 a formed in the fixed die 2, and a tip end faces the cavity 11, and the other end of the flow path 14 communicates with the cavity 11. . With such a flow path structure, the semi-molten metal injected from the injection molding machine enters the flow path 14 of the corresponding hot nozzle 4 from the flow path 12 of the manifold 3 through each branch path 12a, and further responds. The cavity 11 is guided and filled.

Next, the movable member will be described in more detail. Each ejector pin 9 is inserted into a corresponding pin hole 15 provided in the movable die 6, and each pin hole 15 has one end in the corresponding cavity 11. It is open. Here, the ejector plates 7, 8 to which the ejector pins 9 to 9 are attached are relatively moved with respect to the movable mounting plate 5 as the movable mounting plate 5 moves rightward in the drawing to open the mold. With this movement, each ejector pin 9 is moved from the non-ejection position where the distal end is substantially flush with the inner surface of the corresponding cavity 11 as shown in FIG. It is to be moved to the projecting eject position. Note that such movement of the ejector plates 7 and 8 is performed by a projecting pin of a molding machine (not shown) abutting against these rear surfaces (the surface on the right side in the figure). Also, the return pin 10
Numerals 10 to 10 are for returning the ejector plates 7 and 8 to the illustrated positions when the movable mold 6 is closed. In addition,
The configuration of each of the fixed side and movable side members is basically the same as that of a conventional plastic injection mold apparatus, and further detailed description will be omitted.

Next, a configuration specific to this embodiment, that is,
The configuration particularly adopted in configuring as a hot nozzle mold apparatus for metal injection molding will be described below. As shown in FIGS. 1 and 2, the movable die 6 is provided with pin holes 16, 16 in addition to the pin holes 15 of the ejector pins 9 to 9. Each pin hole 16 extends on the same axis as the flow path 14 of the corresponding hot nozzle 4, and opens into the corresponding cavity 11 at a portion facing the outlet of the flow path 14. An extruding pin 17 is inserted into each pin hole 16 so as to be slidable in the axial direction. An end of the extruding pin 17 opposite to the cavity 11 side is inserted into the ejector plate 7 and linked to an actuator 18. ing.

As shown in FIG. 4, each push pin 17 has a first position where the tip surface 17a is substantially flush with the inner surface 11a of the cavity 11 by an actuator 18, and the tip surface 17a has a cavity as shown in FIG. 11 is movable back and forth by a distance L from the second position which gives an additional volume V1 given by the cross-sectional area X distance L of the pin hole 16 to the original volume V defined by the inner surface 11a of the cavity 11. The extruding pin 17 changes the volume of the cavity 11 when the cavity 11 is filled with the semi-molten metal and enters a semi-solid state, as described later, and the semi-solid state in the cavity 11 is changed. This function as a piston for introducing a part of the metal into the tip of the hot nozzle 4, and this operation will be described later.

Next, the structure of each actuator 18 will be described with reference to FIG. 1. The actuator 18 is connected to a hydraulic cylinder 20 mounted in a mounting groove 19 formed over the outer peripheral portions of the ejector plates 7 and 8 therebetween. And an operating member 22 attached to the tip of a piston 21 of the hydraulic cylinder 20. The piston 21 and the operating member 22 are formed between the ejector plates 7 and 8 so as to communicate with the mounting groove 19. It is movably accommodated in the accommodation groove 23 in an appropriate range in the width direction of the mold device (vertical direction in the figure). The left side surface of the actuating member 22 in the figure is an inclined surface 22a.
The pushing pin 17 has a rear end face 17b in contact with the inclined face 22a. The rear end face 17b is an inclined face corresponding to the inclined face 22a, and when the hydraulic cylinder 20 is driven and the piston 21 moves in the direction of the arrow in the figure, this movement is caused by the inclined face 22a and the rear end face 17b to push the push pin 17 out. The movement is converted into a movement to the left in the figure, that is, a movement in a direction protruding toward the cavity 11.

The shape of the inner peripheral surface of the nozzle forming the flow path 14 of each hot nozzle 4 will be described. As apparent from FIG. 3, the inner peripheral surface of the nozzle is a straight long cylindrical main portion extending with the same diameter. 14A, followed by a conical tip portion 14B, and an outlet portion 14C forming a short straight cylindrical surface (annular surface) forming an opening, and gradually taper toward the outlet, The outlet portion 14C is again opened at the same diameter for a short distance. The tip portion 14B and the outlet portion 14C
The tip portion 14 is formed by the push pin 17 as described later.
This constitutes a holding means for holding the semi-solid state metal introduced into B in the tip portion 14B.

Next, the operation of this embodiment will be described in the order of the molding stage. a) First, a nozzle of an injection molding machine (not shown) is brought into contact with the opening peripheral edge 12b at the tip of the projection 3a of the manifold, and semi-molten metal is injected from the injection molding machine. The injected metal enters the flow path 14 of the hot nozzle 4 from the flow path 12 of the manifold 3 via the branch paths 12a, 12a, and is then filled into the cavities 11, 11. At this stage, the mold apparatus is in a closed state as shown in FIG. 1, the actuator 18 of the push pin 17 is in a non-operating state, and the tip surface 17a of the push pin 17 is in the second position in FIG. In addition, an additional volume given by the cross-sectional area X distance L of the pin hole 16 is given to the original volume defined by the inner surface 11a of the cavity 11, and as shown in FIG. However, only the metal is unnecessarily filled. That is,
The pin hole 16 forms a communication chamber for receiving a part of the semi-molten metal introduced into the cavity 11. In addition, as a metal used for the injection molding of this embodiment, an alloy having a low melting temperature such as a magnesium alloy or an aluminum alloy is preferable, and these are semi-molten at a temperature of about 550 to 600 ° C. and used for molding. . b) Then, the fixed mold 2 and the movable mold 6 are cooled by a well-known cooling means (not shown) to a temperature at which the metal becomes a predetermined semi-solid state. For example, when the above magnesium alloy or aluminum alloy is used, a desired semi-solid state can be obtained by cooling to a temperature of about 500 ° C. c) Next, the actuator 18 is driven to lower the operating member 22, and the push pin 17 is moved to the front end face 17 as shown in FIG.
A is moved by a distance L to a first position where a is flush with the inner surface 11a of the cavity 11. Then, the metal M in a semi-solid state corresponding to the additional volume V1 is turned into the hot nozzle 4 as shown in FIG.
Penetrates into the tip of the. d) Next, the fixed mold 2 and the movable mold 6 are cooled until the metal in the cavity 11 is completely solidified, while the temperature of the hot nozzle 4 is controlled to maintain the metal M in the tip portion in a semi-solid state. . This maintenance temperature is a temperature suitable for separation from the completely cooled and solidified metal described later and holding in the tip portion, and is appropriately set according to the applied metal material, the diameter of the tip portion of the hot nozzle 4, and the like. You. e) Next, the movable mold 6 is retracted to the right in FIG. 1 to open the mold. Thereby, as shown in FIG. 5, the metal M in the semi-solid state in the tip of the hot nozzle 4 and the product P completely cooled and solidified are separated at the interface. As a result, a state in which the hot nozzle 4 is covered with the semi-solidified metal M is obtained. f) When the movable die 6 is further retracted to the right side, the ejector plates 7 and 8 come into contact with the protruding pins of the molding machine and are prevented from moving as described above, and the ejector pins 9 protrude into the cavity 11. Product P is cavity 1
1 (for simplicity of illustration, FIG. 3
In FIG. 6, the ejector pin 9 is omitted). Here, since the actuator 18 of the push pin 17 is also attached to the ejector plates 7 and 8 and moves together with the ejector plates 7, 8, the push pin 17 is moved to the ejector pin 9 as shown in FIG.
The product P is protruded and separated from the cavity 11 in the same manner as described above. g) When the removal of the product P is completed, the movable mold 6 is returned to the position shown in FIG. By such a mold clamping, the ejector plates 7 and 8 are attached to the return pins 10 and 1.
1 comes back to the position shown in FIG. 1 by contact with the fixed mold 2, so that the ejector pin 9 has the tip end surface flush with the inner surface 11a of the cavity 11 as shown in FIG. As shown in FIG. 4, the position returns to a position flush with the inner surface 11a of the cavity 11. h) Next, the actuator 18 is driven to return the operating member 22 to the position shown in FIG. Here, since the operating member 22 and the push-out pin 17 are in a contact-only relationship, the operating member 22
4, the pushing pin 17 remains in the state shown in FIG. 4, and a gap is formed between the rear end 17 b of the pushing pin 17 and the operating member 22. i) Thereafter, the hot nozzle 4 is heated to completely convert the semi-solidified metal M into a semi-molten state, and the same injection step as in a) is performed. Retreats from the position of FIG. 4 by the pressure of
The rear end 17b abuts the actuating member 22 to provide the position of FIG. 1 or the additional volume V1 of FIG. By repeating these steps, the product P is continuously formed.

As described above, in the present embodiment, the tip of the hot nozzle 4 is covered with the semi-solidified metal M in step e), and this is maintained until the mold is closed. 4. Leakage of the semi-molten metal from the tip of the fourth metal can be reliably prevented. In addition, since the diameter of the distal end portion can be made large, molding defects can be prevented, large products can be effectively molded, and high cycle molding can be performed. In step c), the metal M in the semi-solid state corresponding to the additional volume V1 enters the tip of the hot nozzle 4, so that the volume of the cavity 11 returns to the original volume V defined by the inner surface 11a. Since this is the required volume of the product P, it has no effect on the shape and dimensions of the molded product. Further, an extrusion pin 1
Reference numeral 7 denotes a state in which the semi-solidified metal M is introduced into the tip of the hot nozzle 4, that is, a state in which the additional volume V1 is zero, and is flush with the inner surface 11a of the cavity 11.
It is possible to obtain a product P having no protrusion due to the existence of a communication chamber with the cavity 11 by the pin hole 16 or a depression P due to the extrusion pin 17, that is, the piston. By making the seal between them perfect, a product of better quality can be obtained. In addition, the inner peripheral shape of the distal end of the hot runner 4 has a conical distal end portion 14B and an outlet portion 14C that forms a short straight cylindrical surface (annular surface) forming an opening. As shown in FIGS. 4 to 7,
The peripheral portion of the semi-solid metal M has a conical front end portion 14.
B prevents not only the frictional force but also the movement toward the outlet opening due to catching, so that it is securely held in the tip portion after being separated from the movable mold 6 until it is heated again for molding. That is, the distal end portion 14B and the outlet portion 14C constitute a holding means for preventing leakage of the semi-solidified metal and thus the semi-molten metal. Further, in the present embodiment, there is an advantage that the extrusion pin 17 as a means for introducing the semi-solidified metal M to the tip of the hot nozzle 4 also serves as an eject pin.

In this embodiment, the introduction means is the push-out pin 17 functioning as a piston driven by the actuator 18. However, such an introduction means may be any as long as it causes a change in the volume of the cavity 11. May be used, for example, the cavity 11
A protrusion that is disposed in a recess formed on the inner wall of the mold and can protrude and retreat from the recess into the cavity 11 or a protrusion that can protrude and retreat from the core in a mold device having a core. good.

The hot nozzle 4 used in this embodiment may be of any type such as a conventional external heating type or an internal heating type. A hot nozzle 4 that is optimal for maintaining a temperature suitable for holding in a section and separating from completely cooled and solidified metal is disclosed in Japanese Patent No. 1589967 (Japanese Patent Publication No. 1-59895) by the present applicant. Is preferably used in combination with the above-mentioned molten metal holding means by the inner peripheral surface of the distal end portion. The structure of such a hot nozzle will be briefly described below with reference to FIG.

The main body 51 of the hot nozzle 50 shown in FIG.
Is located on the inner periphery of the tip 51a, like the hot nozzle 4 described above.
A conical surface-shaped tip portion 54B and an outlet portion 54C that forms a short straight cylindrical surface (annular surface) forming an opening.
The other end has a base 51b for attachment to the manifold 3 shown in FIG. 1, that is, the fixed portion.
A pair of split grooves 5 formed in the body 51 in the longitudinal direction from the base 51b to the tip 51a while leaving the tip 51a.
2, 52 (only one is shown in the figure) are formed. With such a configuration, a voltage from a power supply device (not shown) is applied between the portions of the main body 51 separated by the split grooves 52, 52 via the conducting wires 53, 53 connected to the base portion 51b, so that the distal end portion 51a is mainly formed. Fever can be generated. Here, the tip portion 51a is formed to be thinner than the other portions, thereby enabling temperature control with good responsiveness to a voltage change of the tip portion 51a. The outer peripheral surface of the main body 51 is covered with an insulating coating (not shown) over the entire circumference, and almost the entirety is fixed.
The space 55 is separated from the receiving hole 2a by a gap 55 to minimize the influence of temperature from the fixed mold 2 as much as possible. In addition, the inner peripheral surface of the main body 51 is covered with an insulating ceramic tube 56 over the entire circumference, so that even if the injected semi-molten metal is conductive, it does not become an obstacle to energization and heat generation. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a hot runner mold device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view of a main part showing a state in which a semi-molten metal is filled in a cavity of a mold.

FIG. 4 is a cross-sectional view similar to FIG. 3, showing a state in which semi-solid metal in a cavity is introduced into a tip end of a hot nozzle by an extrusion pin.

FIG. 5 is a cross-sectional view similar to FIG. 3, showing a state where a movable mold is separated from a hot nozzle.

FIG. 6 is a sectional view similar to FIG. 3, showing a state in which a product is taken out of a cavity.

FIG. 7 is a longitudinal sectional view of a hot nozzle of a preferred embodiment.

[Explanation of symbols]

 2 Fixed type 6 Movable type 4, 50 Hot nozzle 11, 11 Cavity 16 Pin hole (communication chamber) 17 Extrusion pin (piston) 18 Actuator 14B Tip part 14C Exit part 51 Main body 51a Tip part 51b Base part 52, 52 Split groove

Claims (7)

[Claims] 1. A method of injection molding a metal material using a hot runner mold apparatus, comprising: a) filling a semi-molten metal injected from an injection molding machine into a mold cavity through a hot nozzle. B) cooling the mold until the semi-molten metal filled in the cavity reaches a predetermined semi-solid state; and c) removing a part of the semi-solid state metal in the cavity. Introducing the metal into the tip of the hot nozzle; and d) maintaining the metal in the tip in a semi-solid state while cooling the mold until the semi-solid metal in the cavity is completely solidified. E) separating the semi-solidified metal in the tip from the cooled and solidified metal by separating the hot nozzle from the mold; and f) removing the metal from the mold. Cumshot with Molding method. 2. The step (c) is performed by reducing the volume in the cavity from a first volume to a second volume smaller than the first volume by a predetermined amount. Claim 1 which corresponds to the volume of the product to be used.
Injection molding method. 3. A semi-molten metal injected from an injection molding machine is filled into a cavity of a mold via a hot nozzle, and the molded metal cooled and solidified in the cavity is taken out from the mold. A hot-runner mold apparatus, wherein when a semi-molten metal filled in a cavity of the mold becomes a predetermined semi-solid state, a part of the metal is introduced into a tip portion of the hot nozzle. Hot runner mold device having an introduction means for the mold. 4. The introduction means includes a piston having a variable volume in a passage chamber provided in the mold in communication with the cavity, and an actuator for driving the piston. Hot runner mold equipment. 5. A piston for providing a first position where the volume of the communication chamber is substantially zero and a second position for providing a volume corresponding to an amount of semi-solidified metal to be introduced into the distal end portion to the communication chamber.
5. The hot runner mold apparatus of claim 4, wherein the apparatus is moved to and from a position. 6. The hot runner mold device according to claim 3, wherein said hot nozzle is provided with means for holding said semi-solid state metal in said tip portion. 7. The hot nozzle has a main body having a tip portion and a base portion for attachment to a fixed portion, and the main body has a longitudinal portion extending from the base portion to the tip portion while leaving the tip portion. A pair of formed grooves are formed, and the distal end portion is mainly configured to generate heat by applying a voltage between the main body portions separated by the split groove via the base portion. Any of hot runner mold equipment.