JP2006021231A - Injecting unit for metal material and injection-forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injecting unit for metal material and an injection-forming method with which a formed product excellent in the quality can be molded, with a simple constitution. <P>SOLUTION: In the injection-forming method for metal material, a plurality of bar-like metal materials M1 or M2 are inserted into a heating cylinder 12 and sequentially melted from the bar-like metal material M1 or M2 at the front side to form molten material M3, and the molten material M3 is injected into a metallic mold 13 by pushing the rear end of the bar-like metal material M1 or M2 at the rear part with a plunger 25, wherein the position A of a plunger after injecting, is detected, and the bar-like metal material M1 or M2 is supplied toward the heating cylinder 12 by using a supplying mechanism 15 so that the total value C added up to the detected value becomes to the prescribed range D. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an injection device and an injection molding method for a metal material such as magnesium or aluminum.

  Conventionally, metal materials such as magnesium and aluminum have been formed by die casting, in which molten metal is injected and filled into a mold under pressure, or by melting a pellet-shaped metal material with an injection screw. A thixo mold method for filling a mold is known. However, since the die casting method requires a melting furnace for melting the metal material in advance, there are problems such as high cost and oxide deposition in the melting furnace. On the other hand, in the thixomold method, there are problems that handling of the metal material in the form of a pellet is complicated and that it is difficult to stably dissolve the metal material because an injection screw is used.

  In order to solve the above problem, those described in Patent Document 1 and Patent Document 2 are known. In the injection devices described in Patent Document 1 and Patent Document 2, a supply mechanism that supplies light metal material to the injection cylinder one by one as a short rod material of a predetermined length, and injection that melts in order from the short rod material previously supplied. A cylinder and its heating device and a push rod member or an injection hydraulic piston rod for injecting molten short rod material by progressively advancing unmelted short rod material are provided. In this injection device, the push rod member is driven by a first drive device that is a hydraulic drive device and a second drive device that is an electric drive device, and the injection hydraulic piston rod has one injection hydraulic pressure. Driven by a cylinder.

  In the injection devices described in Patent Document 1 and Patent Document 2, since the short bar material has a volume, that is, a length corresponding to several shots or more, the short bar material is supplied every several shots during normal molding. Is called. As a result, the molding cycle time for each shot becomes uneven, and the amount of light metal material supplied to and stored in the injection cylinder varies from shot to shot, resulting in variations in the quality of the molded product. Further, in order to keep the amount of pushing in the light metal material that is consumed and shortened every time one shot is ejected, the amount of protrusion of the pushing bar member must be progressively adjusted for each shot by the second driving device. Therefore, the injection device proposed in Patent Document 1 and Patent Document 2 requires the second drive device and must have the control device, which not only increases the cost of the injection device, The time for operating the second driving device is a factor for delaying the molding cycle time.

Japanese Patent Laying-Open No. 2003-211260 (Claims 1, 1 and 2) JP 2004-50269 A (Claim 1, FIG. 1, FIG. 7, FIG. 8)

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a metal material injection device and an injection molding method capable of forming a molded product having excellent quality with a simple configuration.

  According to a first aspect of the present invention, there is provided a metal material injection apparatus comprising: a heating cylinder that melts a plurality of rod-shaped metal materials in order from the front to form a molten material; and an injection of at least the molten material that is attached to the tip of the heating cylinder A nozzle that is sometimes connected to the mold, a plunger that presses the rear end of the rear bar-shaped metal material to inject the molten material into the mold through the nozzle, and a supply that supplies the bar-shaped metal material toward the heating cylinder A metal material injection device comprising: a sensor for detecting a position of the plunger; and a supply mechanism capable of supplying a rod-shaped metal material having a different length toward the heating cylinder. A bar-shaped metal material whose total value added to the value detected by the sensor falls within a predetermined range is supplied toward the heating cylinder using a supply mechanism.

  A metal material injection device according to a second aspect of the present invention is the metal material injection device according to the first aspect, wherein a supply mechanism is disposed at a rear position of the heating cylinder, and the rod-shaped metal material supplied by the supply mechanism is heated using a plunger. It is characterized by being inserted into a cylinder.

  In the metal material injection molding method according to claim 3 of the present invention, a plurality of bar-shaped metal materials are inserted into a heating cylinder, and are melted in order from the front bar-shaped metal material to obtain a molten material. In the metal material injection molding method in which the rear end is pressed by the plunger and the molten material is injected into the mold, the position of the plunger after injection is detected, and the total value added to the detected value is within a predetermined range. A bar-shaped metal material having such a length is supplied toward the heating cylinder.

  The metal material injection molding method according to claim 4 of the present invention is the metal material injection molding method according to claim 3, wherein two types of long and short rod-shaped metal materials are prepared, and the position of the plunger after injection is ahead of a predetermined position. Then, when the longer rod-shaped metal material is supplied toward the heating cylinder and the position of the plunger after injection is behind the predetermined position, the shorter rod-shaped metal material is then directed toward the heating cylinder. It is characterized by supplying.

  In the metal material injection molding method according to claim 5 of the present invention, a plurality of rod-shaped metal materials are inserted into a heating cylinder, and are melted in order from the front rod-shaped metal material to obtain a molten material. In a metal material injection molding method in which the back end is pressed by a plunger and the molten material is injected into a mold, an injection filling value is obtained by dividing the injection filling volume required for one molding cycle by the sectional area in the heating cylinder. A bar-shaped metal that is supplied to the heating cylinder using a subtracted value obtained by subtracting the injection filling remaining amount value from the injection filling value by detecting the injection filling remaining amount value from the stop position of the plunger after injection. It is characterized by determining the length of the material.

  In the present invention, a plurality of rod-shaped metal materials are inserted into a heating cylinder, melted in order from the front rod-shaped metal material to form a molten material, and the rod-shaped metal material at the rear end is pressed by a plunger to put the molten material into the mold. In an injection apparatus and an injection molding method for a metal material to be injected, a rod-shaped metal material having a length such that the position of the plunger after injection is detected and the total value added to the detected value is within a predetermined range is heated. Therefore, it is possible to provide a metal material injection device and an injection molding method capable of forming a molded product having excellent quality with a simple configuration.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a metal material injection apparatus showing a state before the start of injection of molten material. FIG. 2 is a cross-sectional view of the metal material injection device showing a state after injection of the molten material. FIG. 3 is a cross-sectional view of the metal material injection apparatus showing a state when supplying the rod-shaped metal material. FIG. 4 is a diagram showing the relationship between the position of the plunger after injection and the rod-shaped metal material to be supplied.

  As shown in FIGS. 1 to 3, the light metal injection molding apparatus of this embodiment includes an injection apparatus 11 and a mold clamping apparatus (not shown). As shown in FIGS. 1 to 3, the injection device 11 is disposed at the heating cylinder 12, the nozzle 14 attached to the tip of the heating cylinder 12 and connected to the mold 13, and the rear position of the heating cylinder 12. A supply mechanism 15 and an injection cylinder 16 that is an injection mechanism disposed at a position further rearward of the supply mechanism 15. In this embodiment, the nozzle 14 is always in contact with the fixed mold 17 and can raise or lower the temperature of the nozzle 14 so that the metal material inside the nozzle can be solidified or melted. However, the injection device may be movable, and the nozzle and the mold may be in contact with each other only at least when the molten material is injected.

  The mold clamping device includes a fixed plate to which the fixed mold 17 is attached, a movable plate to which the movable mold 18 is attached, a mold opening / closing mechanism and a mold clamping mechanism for moving the movable plate. A cavity 19 is formed between the molds 13 when the fixed mold 17 and the movable mold 18 are matched. Further, a medium flow path is disposed inside the fixed mold 17 and the movable mold 18 so that the molten material injected and filled into the cavity 19 can be cooled by the cooling medium. Note that the communication path to the cavity in the fixed mold may be a hot runner.

  The heating cylinder 12 of the injection device 11 has a predetermined length, and a short rod-shaped metal material M1 or a long rod-shaped metal material M2 (hereinafter simply referred to as a rod-shaped metal material M1 or M2) is disposed inside the heating tube 12. It is possible to insert multiple items. In addition, the heating cylinder 12 is zone-controlled so that the temperature of the heating cylinder 12 becomes higher at the front part by a plurality of heaters 20 disposed on the outer periphery of the heating cylinder. At the rear end of the heating cylinder 12, a material insertion port 21 for inserting the rod-like metal material M1 or M2 is provided. Although not shown in the drawing, a die part that is inserted into the heating cylinder while scraping the outer periphery of the rod-shaped metal material may be disposed at the rear end of the heating cylinder. In this case, the diameter of the die part is the rod-like shape to be inserted. It is formed slightly smaller than the diameter of the metal material. Moreover, you may make it provide the interruption | blocking apparatus which shields the material insertion port of a heating cylinder at the time of a backward movement of a plunger at the rear end of a heating cylinder. Further, a vacuum suction device capable of sucking and degassing the air in the heating cylinder or the gas generated when the metal material is melted may be provided at the rear of the heating cylinder.

  A supply mechanism 15 for supplying the preheated rod-shaped metal material M1 or M2 toward the heating cylinder 12 is disposed at the rear position of the heating cylinder 12. In the present embodiment, the two types of long and short bar-shaped metal materials M1 or M2 prepared and supplied by the supply mechanism 15 have a cylindrical shape, and the shorter bar-shaped metal material M1 is molded in one molding cycle. The volume is smaller than the total volume of the product P and the sprue S. On the other hand, the longer rod-shaped metal material M2 has a volume larger than the total volume of the molded product P and the sprue S molded in one molding cycle. A specific configuration of the supply mechanism 15 will be described. A cylindrical supply unit 24 is provided at a rear position of the heating cylinder 12 so that the plunger 25 moves forward and backward. A supply path 22 for supplying the shorter rod-shaped metal material M1 and a supply path 23 for supplying the longer rod-shaped metal material M2 are attached above the supply section 24 from above to below. It has been. Stoppers 22a and 23a are attached to the bottoms of the supply passages 22 and 23 so as to be openable and closable between the supply passages 24 and 23. Further, other stoppers 22b and 23b are attached to the supply paths 22 and 23 above the stoppers 22a and 23a, respectively, so as to be openable and closable. As for the supply mechanism, the two supply paths may be merged in the vicinity of the input port, and the rod-shaped metal material M1 or M2 may be input to the same position of the supply unit. Further, the supply mechanism may be disposed above the rear part of the heating cylinder, and may have another structure such as one in which a rod-shaped metal material is introduced from a charging port provided on the upper surface of the rear part of the heating cylinder.

  An injection cylinder 16 that can be operated at high speed by hydraulic pressure is disposed on the extension line of the heating cylinder 12 and at a rear position of the supply mechanism 15. The rod of the injection cylinder 16 can be moved back and forth inside the heating cylinder 12 and is a columnar plunger 25 that presses the rod-shaped metal material M1 or M2. A position detection sensor 26 for detecting the position of the plunger 25 is disposed in parallel with the plunger 25. The actuator of the injection mechanism that drives the plunger may use an electric motor.

  Next, the metal material injection molding method of this embodiment will be described. In the present embodiment, a light metal material such as magnesium, aluminum, or an alloy thereof having a relatively low melting point is preferably used as the metal material. As shown in FIG. 1, in the injection apparatus 11 at the start of continuous molding or during continuous molding, a plurality of bar-shaped metal materials M1 or M2 are inserted into the heating cylinder 12, and from the front bar-shaped metal material M1 or M2 It is in a state where it has been melted in sequence to become a molten material M3. The bar-shaped metal material M1 or M2 at the center in the heating cylinder 12 is in a semi-molten state that is not completely melted, and the bar-shaped metal material M1 or M2 at the rear in the heating cylinder 12 is in a solidified state. . Then, almost simultaneously with raising the temperature of the nozzle 14 to bring the metal material in the nozzle 14 into a molten state, the plunger 25 abutted on the rear end of the rod-shaped metal material M1 or M2 in the heating cylinder 12, The injection cylinder 16 is driven to advance at a high speed, whereby the molten material M3 is injected and filled into the cavity 19 in the mold 13 through the nozzle 14. Thereafter, when injection filling including holding pressure is completed, the plunger 25 completely stops in the heating cylinder 12 as shown in FIG.

  The position A of the plunger after the injection is detected by the position detection sensor 26 with the most advanced position of the plunger 25 being zero. The remaining amount of the molten material M3, the semi-molten rod-shaped metal material M1 or M2, and the solidified rod-shaped metal material M1 or M2 in the heating cylinder 12 is detected by the position A of the plunger after injection. In the present embodiment, as shown in FIG. 4, when the position A of the plunger after the injection detected by the sensor 26 is ahead of the predetermined position B (reference position) and when it is behind. Then, it is determined whether the rod-shaped metal material to be supplied next is the shorter rod-shaped metal material M1 or the longer rod-shaped metal material M2. That is, when the position A of the plunger after injection is ahead of the predetermined position B, the next longer rod-shaped metal material M2 is supplied as shown in FIG. When the position A of the plunger after injection is behind the predetermined position B, the next shorter rod-shaped metal material M1 is supplied as shown in FIG. In other words, the position A of the plunger after injection is detected, and the total value C obtained by adding the length of the rod-shaped metal material M1 or M2 to be supplied next to the detected value is within the predetermined range D. Next, the rod-shaped metal material M1 or M2 to be supplied next is determined. In addition, when regular shaping | molding cannot be performed in the last shaping | molding cycle etc., the rod-shaped metal material M1 or M2 may not be supplied next, or it may be supplied to multiple pieces.

  Next, the injection cylinder 16 is actuated to retract the plunger 25 so that the rod-shaped metal material M1 or M2 can be supplied to the supply portion 24 of the supply mechanism 15. For example, when the position A of the plunger after the injection is behind the predetermined position B, as shown in FIG. 3, the stopper 22a of the supply mechanism 15 is opened, and the shorter pre-heated rod-shaped metal material M1 is formed. One is supplied to the supply unit 24 so that the axial direction and the advance / retreat direction of the plunger 25 coincide. In the supply mechanism 15, after the opened stopper 22a is closed, the upper stopper 22b is opened and closed, and the next short pre-heated metal rod M1 is placed above the stopper 22a. Supplied. Similarly, when the longer rod-shaped metal material M2 is supplied, the stoppers 23a and 23b are opened and closed. When either one of the preheated rod-shaped metal materials M1 or M2 is supplied to the supply unit 24, the plunger 25 advances again, and the front surface 25a of the plunger 25 is placed at the rear end of the preheated rod-shaped metal material M1 or M2. The rod-shaped metal material M1 or M2 is inserted into the heating cylinder 12 as it is. Then, as shown in FIG. 1, the front end of the rod-shaped metal material M1 or M2 introduced this time is brought into contact with the rear end of the rod-shaped metal material M1 or M2 that was at the end at the time of the previous molding. The set temperature of the heating cylinder 12 at the position where the rod-shaped metal material M1 or M2 is in contact is set higher than the preheating temperature of the inserted rod-shaped metal material M1 or M2, and the inserted rod-shaped metal material M1. Alternatively, M2 starts to rise in temperature.

  Therefore, in this embodiment, the second drive device is not required as in Patent Document 1, and the injection start position by the plunger 25 is within a substantially constant range even with a simple configuration of only the injection cylinder 16. As a result, stable injection can be performed. In the present embodiment, the rod-shaped metal material M1 or M2 is always filled in the rear portion of the heating cylinder 12 corresponding to the temperature raising zone to almost the same position for each molding cycle. There is an advantage that the thermal history in the heating cylinder 12 of M1 or M2 becomes almost constant. On the other hand, in Patent Document 1 and the like, since a long bar-shaped metal material is supplied every several shots, the heat histories of the bar-shaped metal materials from which each molded product is formed are different. In addition, the temperature of the rear portion of the heating cylinder 12 is fixed by inserting the rod-shaped metal material M1 or M2 having a constant temperature at a substantially constant position for each molding cycle, whereas in Patent Document 1 and the like, the temperature is constant. Since a long rod-shaped metal material is supplied for each shot, the temperature at the rear of the heating cylinder is likely to change.

  On the other hand, on the mold clamping device side, in parallel with the supply of the rod-shaped metal material M1 or M2 on the injection device 11 side, the molten material M3 injected and filled in the cavity 19 is cooled over a predetermined time. When the cooling is completed, the movable mold 18 is opened, the molded product P is taken out, and re-clamping is performed for the next molding. During the operation on the injection device 11 side and the mold clamping device side, in the heating cylinder 12, the foremost one of the semi-molten rod-like metal materials M 1 or M 2 is the metal material at the front of the heating cylinder 12. Is sent to a portion corresponding to the melting zone where the temperature is set so as to be melted, and the melting progresses, and the solid metal rod M1 or M2 on the rear side also advances at the same time and is heated to a predetermined temperature. Melting proceeds. When a predetermined time elapses after re-clamping, the melting of the semi-molten bar-shaped metal material M1 or M2 for approximately one molding cycle and the expected temperature of the solid or semi-molten bar-shaped metal material M1 or M2 are reached. The progress of the semi-melting is completed, and the preparation for starting the next injection is completed. It should be noted that which of the mold clamping device side and the injection device side is quickly completed for preparation of the next molding is not limited because it may differ depending on the molded product, the structure of the device, or the like.

  Next, another embodiment of the metal material injection molding method will be described with reference to FIGS. In another embodiment, first, an injection filling volume required for one molding cycle obtained by adding the volume of the molded product and the volume of the sprue is obtained, and this is calculated as the cross-sectional area in the heating cylinder (perpendicular to the axial direction in the heating cylinder internal space The injection filling value E is calculated by dividing the injection filling volume in the length direction of the heating cylinder. Then, the stop position of the plunger after the end of the injection is detected by the position sensor, and the injection filling remaining amount value G with the plunger most advanced position F being 0 is obtained. Then, a subtraction value H is obtained by subtracting the injection filling residual value G from the injection filling value E. When the subtraction value H is 0 or a negative value, the rod-shaped metal material is not supplied toward the heating cylinder during the next molding cycle. Therefore, “determining the rod-shaped metal material to be supplied toward the heating cylinder” in the present invention includes a case where no rod-shaped metal material is supplied. When the subtraction value H is a positive value, the shortest bar-shaped metal material M1 or M2 is then supplied toward the heating cylinder under the condition that the subtraction value H is smaller than the length of the bar-shaped metal material. In the specific examples of FIGS. 5A and 5B, the injection filling value E is 60 mm, and the lengths of the rod-shaped metal materials M1 and M2 to be supplied are prepared in two types, 50 mm and 75 mm. . In FIG. 5A, since the injection filling remaining amount value G is 5 mm, the injection filling remaining amount value G (5 mm) is subtracted from the injection filling value E (60 mm) to obtain a subtraction value H (55 mm). As a result, a rod-shaped metal material M2 having a length of 75 mm longer than the subtraction value H (55 mm) is supplied next. In the example of FIG. 5B, since the remaining injection filling value G is 15 mm, the remaining injection filling value G (15 mm) is subtracted from the injection filling value E (60 mm) to obtain a subtraction value H (45 mm). As a result, the rod-shaped metal material M1 having the shortest length of 50 mm among the rod-shaped metal materials M1 or M2 longer than the subtraction value H (45 mm) is supplied next. In the above calculation, the injection filling remaining amount value G may be subtracted from the injection filling value E added with a predetermined margin value.

  In another embodiment, the case where the molded product to be molded is replaced with a mold having a different injection filling volume can be dealt with. For example, FIGS. 6A and 6B show a case where the mold is replaced with a mold having an injection filling value E of 110 mm. In FIG. 6A, since the remaining injection filling value G is 15 mm, the remaining injection filling value G (15 mm) is subtracted from the injection filling value E (110 mm) to obtain a subtraction value H (95 mm). Thus, a rod-shaped metal material longer than the calculated subtraction value H (95 mm) is supplied. Therefore, the next supply is not a single 75 mm metal rod M2 but two 50 mm metal rods M1. In FIG. 6B, since the remaining injection filling value G is 40 mm, the subtracted value H (70 mm) is obtained by subtracting the remaining injection filling value G (40 mm) from the injection filling value E (110 mm). Thus, one rod-like metal material M2 having a length of 75 mm longer than the subtraction value H (70 mm) is supplied. In this way, in another embodiment, even when the mold is replaced, by combining the appropriate rod-shaped metal materials M1 and M2, the position of the plunger at the start of the next injection can be within a predetermined range. it can. As yet another embodiment, for a rod-shaped metal material, a standard rod-shaped metal material substantially equal in volume to one molding cycle including a molded product and a sprue, a rod-shaped metal material having a shorter overall length than the standard rod-shaped metal material, and the standard rod-shaped material You may make it supply three types of rod-shaped metal materials of a rod-shaped metal material longer than a metal material selectively to a heating cylinder. Or you may make it prepare the said 4 or more types of rod-shaped metal material from which length differs, and supply either to a heating cylinder.

  In addition, this invention includes what can be implemented in the aspect which added various change, correction, improvement, etc. based on the knowledge of those skilled in the art. Further, it goes without saying that any of the embodiments to which the above-mentioned changes are added is included in the scope of the present invention without departing from the gist of the present invention. This embodiment and another embodiment include another calculation method having the same purpose.

It is sectional drawing of the injection device of the metal material which shows the state before the injection start of molten material. It is sectional drawing of the injection device of the metal material which shows the state after the injection of molten material. It is sectional drawing of the injection device of a metal material which shows the state at the time of supply of a rod-shaped metal material. It is a figure which shows the relationship between the position of the plunger after injection | emission, and the rod-shaped metal material supplied. It is explanatory drawing which shows the injection molding method of the metal material of another embodiment. It is explanatory drawing which shows the injection molding method of the metal material of another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Injection apparatus 12 Heating cylinder 13 Mold 14 Nozzle 15 Supply mechanism 16 Injection cylinder 17 Fixed mold 18 Movable mold 19 Cavity 20 Heater 21 Material insertion port 22, 23 Supply path 22a, 22b, 23a, 23b Stopper 24 Supply part 25 Plunger 25a Front face 26 Position detection sensor A Position of plunger after injection B Predetermined position C Total value D Predetermined range E Injection filling value F Plunger most advanced position G Injection filling residual value H Subtraction value M1 Shorter rod-shaped metal material M2 Longer rod-shaped metal material M3 Molten material P Molded product S Sprue

Claims (5)

A heating cylinder that melts a plurality of rod-shaped metal materials in order from the front to form a molten material, a nozzle that is attached to the tip of the heating cylinder and is connected to a mold at least when the molten material is injected, and a rod-shaped metal behind In a metal material injection apparatus comprising: a plunger that presses a rear end of the material and injects the molten material into a mold through a nozzle; and a supply mechanism that supplies the rod-shaped metal material toward the heating cylinder.
A sensor for detecting the position of the plunger;
A supply mechanism capable of supplying rod-shaped metal materials of different lengths to the heating cylinder,
The rod-shaped metal material is supplied toward the heating cylinder using the supply mechanism such that the total value obtained by adding the position of the plunger after injection to the value detected by the sensor is within a predetermined range. Metal material injection device. The supply mechanism is disposed at a rear position of the heating cylinder,
The metal material injection device according to claim 1, wherein the rod-shaped metal material supplied by the supply mechanism is inserted into the heating cylinder using a plunger. A plurality of rod-shaped metal materials are inserted into a heating cylinder, melted in order from the front rod-shaped metal material to form a molten material, and the rear end of the rod-shaped metal material at the rear is pressed by a plunger to inject the molten material into the mold. In the metal material injection molding method,
An injection molding of a metal material, characterized by detecting the position of the plunger after injection and supplying the rod-shaped metal material toward the heating cylinder so that the total value added to the detected value is within a predetermined range. Method. Prepare two types of long and short bar metal materials,
If the position of the plunger after injection is ahead of the predetermined position, then supply the longer rod-shaped metal material toward the heating cylinder,
4. The metal material injection molding method according to claim 3, wherein when the position of the plunger after injection is behind the predetermined position, the shorter rod-shaped metal material is supplied to the heating cylinder next. A plurality of rod-shaped metal materials are inserted into a heating cylinder, melted in order from the front rod-shaped metal material to form a molten material, and the rear end of the rod-shaped metal material at the rear is pressed by a plunger to inject the molten material into the mold. In the metal material injection molding method,
The injection filling value is calculated by dividing the injection filling volume required for one molding cycle by the cross-sectional area in the heating cylinder,
Detect the remaining injection filling value from the plunger stop position after injection,
A metal material injection molding method comprising: determining a length of a rod-shaped metal material to be next supplied to the heating cylinder by using a subtraction value obtained by subtracting the injection filling remaining amount value from the injection filling value.

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