KR20050042723A - Injection molding device and injection molding method of metal material - Google Patents

Abstract

An object of the present invention is to provide an injection apparatus for a metal material capable of molding a molded article having excellent quality by a simple configuration.

The heating cylinder 10 which melts the metal material S1 and uses it as the molten material M, the nozzle 20 attached to the front-end | tip of this heating cylinder 10, and connected to the metal mold | die 30, and the said molten material ( In the injection device of a metal material having a plunger (P) to press the M) to be injected into the mold 30 through the nozzle 20, the metal material (S1) of the length corresponding to the molded product in the heating tube (10) And a die 15 provided between the heating cylinder 10 and the material supply cylinder 40 to cut the outer periphery of the metal material S1, and It is provided in the vicinity of the said dice | dies 15 in the rear part of the heating cylinder 10, and the suction apparatus 50 which degass the inside of the heating cylinder 10 is provided.

Description

Injection device and injection molding method of metal materials {INJECTION MOLDING DEVICE AND INJECTION MOLDING METHOD OF METAL MATERIAL}

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

Conventionally, as a molding method of a metal material such as magnesium or aluminum, a die casting method in which a molten metal is injected into a mold under pressure to obtain a molded product, or a thixotropic molding method in which a pellet-shaped metal material is melted by an injection screw and filled in a mold. This is known. However, since the die casting method requires a melting furnace for dissolving the metal material in advance, there are problems such as high cost or deposition of oxides in the melting furnace. On the other hand, in the thixotropic molding method, handling of a pellet-shaped metal material is complicated and there is a problem that stable dissolution of the metal material is difficult because injection screws are used.

Thus, a molten metal material supply device having a heating tube having an inlet for accepting the material to be melted and an outlet of the molten material, and a decompression means connected to the heating tube, and a molten metal material supplied from the molten metal material supply device. An injection device having a pressurized filling device for filling into the device has been devised (see Patent Document 1, for example).

In this injection apparatus, the outlet of the molten metal material supply device is blocked when the piston of the pressure filling device is in the forward position, and when the piston is in the retracted position, the outlet communicates with the material filling chamber in the cylinder. The piston is moved from the forward position to the retracted position while the communication with the mold cavity through the hot nozzle connected to the material filling chamber becomes a negative pressure, and the negative pressure applied to the molten material in the decompression means and the material By adjusting the balance with the negative pressure of the filling chamber, the inflow of molten material into the material filling chamber is prevented, and after the piston retreats to a predetermined position, only a predetermined amount of material is supplied from the molten metal material supplying device to The filling chamber is filled, the piston is advanced, and the molten material is filled into the cavity of the mold to be molded. Is performed.

In the injection apparatus described in Patent Document 1, since the molten material can be regularly supplied into the cylinder from the material supply device, the melting furnace is unnecessary, and the molding operation can be performed smoothly and surely, and the heating cylinder or the cylinder (material Since molding can be performed in the state of keeping the inside of the filling chamber) in a vacuum state, it becomes possible to improve the quality and yield of the molded article. However, in recent years, there has been a demand for an injection apparatus capable of making the structure of the apparatus simpler and at the same time obtaining a molded article of excellent quality.

In addition to the injection device described in Patent Document 1, a material supply device for supplying light metal materials to the injection cylinder one by one as a single rod material; There exists a push rod member which injects molten single rod material by progressively advancing a single rod material, or the injection apparatus of the light metal injection molding machine provided with the injection hydraulic piston rod (for example, refer patent document 2). In this injection apparatus, the push rod member is driven by the first drive, which is a hydraulic drive, and the second drive, which is an electric drive, and the injection hydraulic piston rod is driven by one injection hydraulic cylinder. .

In the injection device described in Patent Document 2, since the light metal material has a volume or length corresponding to several shots or more, it is pushed in order to make the indentation amount of the light metal material consumed and shortened every one shot injection constant. The amount of protrusion of the rod member must be adjusted progressively from shot to shot by the second drive device.

Therefore, the injection apparatus proposed in the said patent document 2 requires a 2nd drive apparatus, and also has to provide the control apparatus, not only does the cost of an injection apparatus become high, but also the time for operating a 2nd drive apparatus is long. This is a factor that delays the molding cycle time. In addition, since the supply of light metal material is performed every few shots, the molding cycle time for each shot becomes uneven, and the amount of light metal material supplied to and stored in the injection cylinder for each shot is changed, resulting in uneven quality of the molded article. .

In addition, the injection apparatus proposed in Patent Document 2 has a function of purging the air in the gap between the injection cylinder and the single rod material with an inert gas, but this does not purge the air in the closed space, and further degassing the injection cylinder. Since the metal molten metal stored in the injection cylinder is oxidized, the surface of the molded product is soiled or the strength of the molded product is insufficient.

(Patent Document 1) Japanese Unexamined Patent Publication No. 2000-254764

(Patent Document 2) Japanese Unexamined Patent Publication No. 2003-211260

This invention is made | formed in view of the said situation, and an object of this invention is to provide the injection apparatus of the metal material which can shape | mold the molded article excellent in quality by a simple structure.

That is, the invention of claim 1 includes a heating tube for melting a metal material into a molten material, a nozzle attached to the tip of the heating tube and connected to the mold, and a plunger for pressing the molten material and injecting the molten material into the mold through the nozzle. An injection apparatus for a metal material having a metal material, comprising: a material supply cylinder for supplying a metal material having a length corresponding to a molded product to the heating cylinder for each molding cycle, and provided between the heating cylinder and the material supply cylinder to cut an outer circumference of the metal material It is related with the die | dye and the suction apparatus provided in the vicinity of the said die in the rear part of the said heating cylinder, and degassing the inside of a heating cylinder, It is related with the injection apparatus of the metallic material characterized by the above-mentioned.

The invention according to claim 2, wherein an advance position is provided between the die and the material supply cylinder, which is in close contact with the end face of the die to seal the inside of the heating cylinder, and allows the passage of the metal material. A metal material injection apparatus provided with a blocking member for reciprocating between a retracted position.

The invention according to claim 3 relates to an injection apparatus for a metal material according to claim 2, wherein the blocking member is configured to scrape off the cutting chips of the metal material the dice cut when moving from the retracted position to the forward position.

The invention of claim 4 is, when molding a molded article by the injection apparatus according to claim 2, when supplying a metal material from the material supply cylinder to the heating cylinder through the die, and after the injection is finished and the plunger is retracted And degassing the interior of the heating cylinder by operating the suction device when the blocking member closes the interior of the heating cylinder.

(The best form to carry out invention)

Embodiment of this invention is described in detail based on drawing.

1 is a longitudinal cross-sectional view showing the situation of an injection apparatus when degassing the inside of a heating cylinder before supplying a metal material to a heating cylinder, and FIG. 2 is an injection apparatus when degassing the inside of a heating cylinder while supplying a metal material to a heating cylinder. 3 is a longitudinal cross-sectional view showing the situation of the injection apparatus just before advancing the plunger to inject the molten material into the mold, and FIG. 4 is a longitudinal cross-sectional view of advancing the plunger to inject the molten material into the mold. Fig. 5 is a longitudinal sectional view showing the situation of the injection apparatus at the time, and Fig. 5 is a longitudinal sectional view showing the situation of the injection apparatus when the injection of the molten material into the mold is completed, and Fig. 6 is the retraction of the plunger and the blocking device to be advanced to be heated. It is a longitudinal cross-sectional view which shows the situation of the injection apparatus at the time of degassing a cylinder again, and FIG. 7 is an expanded sectional drawing which shows the degassing state of a suction apparatus.

The injection apparatus shown in FIGS. 1-6 is the heating cylinder 10 which melts metal material S1 and uses it as the molten material M, and is attached to the front-end | tip of this heating cylinder 10, and is attached to the metal mold | die 30. FIG. It has a nozzle 20 to be connected, and the plunger P which pressurizes the said molten material M, and injects into the metal mold | die 30 through the nozzle 20, The length of a length suitable for a molded article to the said heating cylinder 10 is provided. The die which is provided between the material supply cylinder 40 which supplies a metal material S1 every molding cycle, and the said heating cylinder 10 and the said material supply cylinder 40, and cuts the outer periphery of the metal material S1 ( 15 and a suction device 50 provided near the die 15 at the rear portion of the heating cylinder 10 to degas the inside of the heating cylinder 10.

In this injection apparatus, the die 15 is fixed to the end face of the half nozzle 20 side of the heating cylinder 10, and the material supply cylinder 40 is spaced a predetermined distance from the die 15 and the heating cylinder ( 10) and the die 15 is arranged coaxially. Moreover, the said suction device 50 is provided in the back part position near the dice | dies 15 of the said heating cylinder 10. Moreover, as shown in FIG. Hereinafter, the main part of the injection apparatus which concerns on this invention is demonstrated.

The heating cylinder 10 is comprised from the thick metal cylinder with sufficient pressure resistance, heat resistance, and abrasion resistance. In the heating tube 10, in the inner hole 11, a tapered surface 12 is formed at a position other than the upper surface of the tip side to which the nozzle 20 is attached, and on the rear side side to which the die 15 is fixed. The inner diameter of the tip portion is smaller than the inner diameter. In the vicinity of the die 15 on the rear side side upper surface of the inner hole 11, an opening hole 13 for the suction device 50 described later is provided. In addition, a tip portion in which a plurality of (four in this embodiment) heaters 16 are wound and mounted on the outer circumference of the heating tube 10 and the nozzle 20 is attached from the rear portion to which the metal material S1 is supplied. Temperature control is carried out so that it may become gradually high temperature over time. The section about one third of the total length of the heating tube 10 from the tip end of the heating tube 10 is set to a temperature at which the metal material S1 is melted to become the molten material M. FIG. For example, when the metal material S1 is a magnesium alloy, the temperature of the said section of the heating cylinder 10 is set to 620 degreeC. In the drawings, reference numeral S2 denotes a metal material in a semi-molten state supplied in the previous molding cycle, S3 denotes a metal material in which a molten state is advanced from the metallic material S2, and S4 denotes a molten state further in progress from the metal material S3. It is a metal material.

The die 15 is fixed to the end face of the half nozzle 20 side of the heating cylinder 10 so as to face the end face of the material supply cylinder 40, and has a cutting portion at an end portion of the material supply cylinder 40 side. 15a) is formed. The inner diameter of the die 15 is the same diameter as the inner diameter of the inner hole 11 of the heating tube 10 on the attaching surface side between the die 15 and the heating cylinder 10, and the cutting portion 15a. On the side, the die 15 and the metal material S1 are formed at a temperature of about 0.2 mm smaller than the diameter of the metal material S1. Therefore, as shown in FIG. 2, when the metallic material S1 is pushed into the inner hole 11 of the heating tube 10 by the plunger P, its outer periphery is cut evenly, and the metallic material The oxide film on the outer periphery of (S1) can be removed. At that time, the cutting dregs Sw generated at the cutting portion 15a of the die 15 fall into the recovery box 64 provided below the die 15.

The nozzle 20 is fixed to the front end surface of the heating cylinder 10 and has an inner hole 21 which communicates smoothly from the inner hole 11 of the heating cylinder 10. The inner hole 21 is a diameter smaller than the inner diameter of the rear side of the inner hole 11 of the heating tube 10, and the shaft center is eccentrically above the shaft center of the inner hole 11 of the heating tube 10, The upper surface of the inner hole 21 and the upper surface of the inner hole 11 of the heating tube 10 communicate with each other in a straight line shape, while the other portions are formed to communicate smoothly in a tapered shape. Moreover, the nozzle 20 has a heater (not shown) with a comparatively large heat generation amount, and the heater can raise the nozzle 20 to the temperature which the metal material S1 melts in several seconds. Then, except when the molten material M is injected into the mold 30 (shown in FIGS. 3, 4 and 5), the flow of the molten material M is prevented and the inside of the heating tube 10 is sealed. In order to maintain the state, the heater of the nozzle 20 is controlled so that a current does not pass.

Moreover, the nozzle tip part 22 which is the tip end part of the said nozzle 20 is cylindrical, diameter is reduced in taper shape from the said inner hole 21, and it opens in the cross section of the nozzle tip part 22. As shown in FIG. The nozzle tip part 22 is moved and fitted toward the insertion hole 33 provided in the fixed mold 31 among the metal mold | die 30 which consists of the fixed metal mold 31 and the movable metal mold | die 32. Movement of the nozzle tip 22 is reciprocated in the axial center direction of the nozzle 20 by a driving device (not shown) provided below the injection apparatus. The position where the forward end of the nozzle tip part 22 stops is a position where the cross section of the nozzle tip part 22 forms the surface of the cavity C in the fixed mold 31, It comes in contact. Moreover, the position where the backward of the nozzle tip part 22 stops is a distance of several mm sufficient to isolate | separate the nozzle tip part 22 from the molded article M3, and to cut the molten metal 34 of the molded article M3. However, due to the cleaning of the nozzle tip 22 and the surroundings of the bath opening 34, etc., a work space is required between the nozzle tip 22 and the fixed mold 31, so that the injection apparatus has a sufficient reverse stroke. have. In addition, the mold 30 is installed in a mold fastening device (not shown), and the movable mold 32 is approached and spaced apart from the stationary mold 31. Then, the movable mold 32 approaches the stationary mold 31 to be mold-fitted to form a cavity C, which is further pressure-tightened.

The material supply cylinder 40 is a cylindrical shape having an inner hole 41 through which the plunger P is loosened, and an inlet 42 through which the metal material S1 can easily drop and pass is provided at the upper portion thereof. . The metal material S1 injected into the material supply container 40 is previously heated by a separately prepared heating device (not shown). This preheating temperature is 300 degreeC, for example, when metal material (S1) is magnesium. And the conveyance and carrying in means of this metal material S1 can employ | adopt well-known means like the material supply apparatus shown by FIG. 3 of patent document 2, for example.

The plunger P is advanced by high pressure and high speed by driving means (not shown) to press the metal material S1 and to push it into the heating cylinder 10. As this driving means, a well-known apparatus, such as a hydraulic cylinder which can easily realize a high pressure and a high speed demand by using an accumulator, is suitable, but a servo motor or the like may be used. The plunger P is the maximum stroke that advances from the position where the plunger P retreats so that the inlet 42 of the material supply container 40 develops and injects the largest molten material that can be melted in the injection apparatus. It is movable to the position. The plunger P is capable of positioning movement between arbitrary strokes within the range of the maximum stroke. Moreover, the diameter of the said plunger P becomes a value slightly smaller than the cutting part 15a which is an inner diameter of the dice | dies 15. As shown in FIG.

As shown in FIG. 7, the suction device 50 includes a first opening and closing means 51, a pin 52, and a guide cylinder 55 formed of an air cylinder or the like. The pin 52 is a rod-shaped projecting from the first opening and closing means 51, and has a small diameter portion 53 at its tip. The small diameter portion 53 is inserted into and removed from the opening hole 13 provided in the vicinity of the die 15 in the rear portion of the heating tube 10 by the operation of the first opening and closing means 51. The guide cylinder 55 is fixed to the outer circumferential surface of the heating cylinder 10 around the opening hole 13 of the heating cylinder 10, guides the fins 52 and holds the first opening / closing means 51. do. The guide cylinder 55 is provided with a suction port 57 to which a fin 56 for heat dissipation and a vacuum pump (not shown) for degassing the heating cylinder 10 are connected.

In the suction device 50, when the first opening and closing means 51 advances the fin 52, the small diameter portion 53 of the fin 52 opens the opening hole 13 of the heating tube 10. And the tapered surface 54, the diameter of which extends from the small diameter portion 53 of the pin 52, is brought into contact with the tapered surface 14, the diameter of which is extended outward from the opening hole 13, The inside of the barrel 10 is sealed. When the first opening and closing means 51 retracts the fin 52, the small diameter portion 53 of the fin 52 is pulled out of the opening hole 13 of the heating tube, and the opening hole 13 The tapered surface 14 of) and the tapered surface 54 of the small diameter portion 53 are isolated. Thereby, the inside of the said heating cylinder 10 and the said suction port 57 are communicated through the clearance gap or the groove | channel between the said fin 52 and the guide cylinder 55. As shown in FIG. Since the vacuum pump is connected to the suction port 57, it is possible to suck and degas the air in the heating cylinder 10, the gas generated during the melting of the metal material S1, and the like.

Moreover, in the injection apparatus of this invention, it is preferable to provide the blocking member 60, as prescribed | regulated to invention of Claim 2. The blocking member 60 is provided between the die 15 and the material supply cylinder 40 and protrudes from the second opening and closing means 61 and the second opening and closing means 61 made of an air cylinder or the like. It is comprised by the rod-shaped rod 62 extended and the shutter 63 fixed to the front-end | tip of the said rod 62. The shutter 63 is a disc-shaped member having a thickness of several mm, which is in close contact with the end face of the die 15 to seal the inside of the heating vessel 10 and allows the passage of the metal material S1. Between the retracted positions, it is provided to reciprocate so as not to slide on the end face of the die 15 and the end face of the material supply cylinder 40. The sliding surface of the shutter 63 with the dice 15 is smoothly processed so as to be in close contact with the dice 15 and to keep the inside of the heating cylinder 10 sealed. In addition, as shown in FIG. 1, the shutter 63 and the die 15 are in contact with each other at a forward position where the shutter 63 develops a cross section of the die 15 as necessary. The packing may be installed.

As defined in the invention of claim 3, the blocking member 60 scrapes off the cutting chips Sw of the metal material S1 cut by the die 15 when moving from the retracted position to the advanced position. It is composed. That is, when cutting the outer periphery of the metal material S1, a part of the cutting residue Sw adheres to the end surface of the die 15 and remains. Therefore, as shown in FIG. The shutter 63 scrapes it off. Therefore, it is possible to prevent the cutting dregs Sw from cutting into the metal material S1, resulting in cutting marks, or scattering the dregs Sw around and deteriorating the working environment. Further, the lower end face of the die 15 of the shutter 63 has a blade shape smaller than 90 degrees in order to effectively scrape off the cutting chips Sw of the metal material S1 by the die 15. It is preferably formed.

As shown in FIG. 1, the second opening and closing means 61 of the blocking member 60 is installed on the rod 62 and the shutter 63 linearly and coaxially to drive up and down. The opening / closing means 61 may be provided on the side of the shutter 63 to drive in the normal or horizontal direction. The drive shaft of the second opening / closing means 61 and the shutter 63 is installed without linearly and coaxially installing the second opening / closing means 61 on the rod 62 and the shutter 63. You may install so that it may become parallel or circular arc.

Next, based on FIGS. 1-6, the operation | movement of the injection apparatus of this invention is demonstrated in detail sequentially according to the molding cycle. First, the metal material S1 can be suitably used a light metal material such as magnesium or aluminum. The metal material S1 is obtained by cutting the round bar into a predetermined length so as to have a volume slightly larger than that of the molded article M3 to be molded.

In FIG. 1, the preheated metal material S1 is supplied to a predetermined position of the material supply cylinder 40. The cutoff device 60 closes the inside of the heating tube 10 by bringing the shutter 63 into close contact with the end face of the die 15. The suction device 50 opens the opening hole 13 to degas. In the heating vessel 10, the molten material M is stored in the front portion thereof, and in the rear thereof, the metal material S2 before being supplied in the previous molding cycle remains in the semi-molten state. Since the nozzle 20 is not energized by the heater, the molten material M of the nozzle tip part 22 is solidified and the inside of the said heating cylinder 10 is sealed. In such a situation, the molten material M and the preceding metal material S2 in the heating vessel 10 depend on the heating amount of the plurality of heaters 16 set to gradually increase on the front side side of the heating vessel 10. Therefore, a molten state progresses gradually from the rear part side of the said heating cylinder 10. As shown in FIG. That is, in the vicinity of the metal material (S2) is a semi-melt state, in the vicinity of the metal material (S3), the melting has progressed than the metal material (S2), in the vicinity of the metal material S4 is in a state of melting than the metal material (S3) Furthermore, melting advances to become the molten material M near the tip of the heating tube 10. When the molten material M and the metal materials S2 to S4 are sufficiently melted even in a part of them, the viscosity is extremely low, so that the molten material M flows downward in the heating vessel 10 and a space is formed thereover. . Through this space, the suction device 50 degass extremely effectively. Therefore, it is preferable that the suction device 50 is provided on the upper surface of the heating cylinder 10. In this way, since the inside of the heating tube 10 is degassed, the surface of the molten material M is oxidized and slag to prevent the surface of the molded product from being fouled or the strength of the molded product is lowered.

In FIG. 2, after the shutter 63 of the blocking device 60 is retracted from the cross section of the die 15, the plunger P is advanced and the metal material S1 is heated through the die 15. Push it into the cylinder. At this time, the outer periphery of the metal material (S1) is cut by a predetermined amount by the dice 15, the cutting residue (Sw) is dropped to the recovery box (64). While the metal material S1 passes through the die 15, the inside of the heating vessel 10 is sealed, so that the suction device 50 can continuously perform degassing. When the outer periphery of the metal material S1 is cut, a part of the cutting dregs Sw is attached to the outer periphery of the cutting portion 15a of the die 15.

In FIG. 3, the degassing operation of the suction device 50 is stopped, and the plunger P is further advanced to insert all of the metal material S1 into the heating tube 10. Until this time, the movable mold 32 is brought close to the stationary mold 31, and the mold C is pressed to form a cavity C. Moreover, the electricity supply to the heater of the nozzle 20 is started over immediately before and just after that, and the said nozzle 20 is heated up.

In FIG. 4, the plunger P is advanced at high speed, and the molten material M1 is injected into the cavity C and filled. At this time, the reverse flow of the molten material M in the inner hole 11 surface of the heating tube 10 is mainly prevented by the metal material S2. That is, the die 15 is formed such that the diameter of the metal material S2 before being cut by the cutting portion 15a of the die 15 is about 0.2 mm smaller than the diameter of the inner hole 11 of the heating tube 10. Is precisely defined in the cutting portion 15a. In addition, since the metal material S2 before being inserted into the heating vessel 10 is heated to a higher temperature as it moves forward, the diameter of the metal material S2 is thermally expanded according to the temperature difference between the die 15 and the heating vessel 10. Quantitative increase. 3 and 4, since the thermal expansion rate of the preceding metal material S2 is larger than that of the heating vessel 10, the diameter and the front of the inner hole 11 of the heating vessel 10 are the same. The difference with the diameter of the metal material S2 becomes extremely small. Therefore, even if the former metal material S2 is crushed by the pressure of injection, the backflow of the molten material M is fully prevented.

In FIG. 5, the injection process continued from FIG. 4 is performed by injection-filling the molten material M2 of the prescribed amount according to the volume of the molded article based on the advance distance of the plunger P. In FIG. During this injection process, the former metal material S2 is substantially melted to become the metal material S3, and a part of the metal material S1 also starts to melt.

In FIG. 6, the plunger P is retracted to a position where the inlet 42 of the material supply container 40 is opened. Thereafter, the blocking device 60 is operated to lower the shutter 63 from its retracted position to the advanced position. At this time, the cutting dregs Sw adhering to the periphery of the cutting part 15a of the dice 15 are scraped off by the shutter 63 and fall into the collection box 64. The shutter 63 is in close contact with the end face of the die 15 to seal the inside of the heating tube 10, and then the suction device 50 is opened to degas the inside of the heating tube 10. In Fig. 5, the metal material S1 remaining in the heating cylinder 10 is provided in the next molding cycle, and the sign is changed to the previous metal material S2. In addition, the molten material M2 filled in the cavity C in FIG. 5 is cooled by the metal mold | die 30, and becomes the molded article M3. The molded article M3 is taken out of the mold 30 opened by isolating the fixed mold 31 together with the movable mold 32.

Moreover, this invention includes what can be implemented in the aspect which added various changes, correction, improvement, etc. based on the knowledge of a person skilled in the art. In addition, it goes without saying that all the embodiments which added the said change etc. are contained in the scope of the present invention, unless the embodiment departs from the meaning of this invention.

The invention of claim 1 includes a heating cylinder for melting a metal material into a molten material, a nozzle attached to a tip of the heating cylinder and connected to a mold, and a plunger for pressing the molten material and injecting the molten material into the mold through the nozzle. An injection apparatus for a metal material, comprising: a material supply cylinder for supplying a metal material having a length corresponding to a molded product to the heating cylinder for each molding cycle, and a die provided between the heating cylinder and the material supply cylinder to cut the outer periphery of the metal material; And a suction device which is provided near the die at the rear portion of the heating cylinder and degass the inside of the heating cylinder, which makes it easy to configure the injection apparatus and degass the supply of the metal material to the heating cylinder. It can carry out in atmosphere, and the molded article of the outstanding quality can be obtained.

The invention of claim 2 is provided with an injection apparatus according to claim 1, which is provided between the die and the material supply cylinder, adheres to an end surface of the die to close the inside of the heating cylinder, and passes through the metal material. Since a blocking member for reciprocating between the retracted position is further provided, the inside of the heating tube can be degassed even after the injection is finished until the supply of the metal material to the heating tube is achieved, thereby forming a molded article of better quality. You can get it.

According to the invention of claim 3, since the blocking member is configured to scrape off the cutting chips of the metal material that the dice cut when moving from the retracted position to the forward position, it does not adversely affect the cutting of the metal material by the dies, Work environment can be maintained well.

The invention of claim 4 is, when molding a molded article by the injection apparatus according to claim 2, when supplying a metal material from the material supply cylinder to the heating cylinder through the die, and after the injection is finished and the plunger is retracted When the blocking member closes the inside of the heating tube, the suction device is operated to degas the inside of the heating tube. Therefore, when the metal material is supplied to the heating tube and after the injection is finished, the material is supplied to the heating tube. In addition, the inside of a heating cylinder can be degassed and the molded article of more excellent quality can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the situation of the injection apparatus at the time of degassing in a heating container before supplying a metal material to a heating container.

Fig. 2 is a longitudinal sectional view showing the situation of an injection apparatus when degassing the inside of a heating cylinder while supplying a metal material to the heating cylinder.

3 is a longitudinal cross-sectional view showing the situation of the injection apparatus just before advancing the plunger to inject the molten material into the mold.

Fig. 4 is a longitudinal sectional view showing the situation of the injection apparatus when the plunger is advanced to inject the molten material into the mold.

5 is a longitudinal sectional view showing a state of the injection apparatus when the injection of the molten material into the mold is completed.

Fig. 6 is a longitudinal sectional view showing the situation of the injection apparatus when the plunger is retracted and the shutoff apparatus is advanced to degas the heating chamber again.

7 is an enlarged cross-sectional view showing a degassing state of the suction device.

(Explanation of drawing)

10 heating cylinders and 15 dice

20 nozzles and 30 molds

40 Material feed container 50 Suction unit

60 blocking device M molten material

M3 molded parts P plunger

S1 metal material Metal material in front of S2

Sw cutting residue

Claims (4)

To a metal material injection apparatus having a heating tube for melting the metal material into a molten material, a nozzle attached to the tip of the heating tube and connected to the mold, and a plunger for pressing the molten material and injecting the molten material into the mold through the nozzle. In A material supply passage for supplying a metal material of a length suitable for a molded article to the heating cylinder for each molding cycle; A die provided between the heating cylinder and the material supply cylinder, for cutting an outer circumference of the metal material; An apparatus for injecting a metallic material, comprising: a suction device provided near the die at a rear portion of the heating cylinder to degas the inside of the heating cylinder. 2. An advancing position according to claim 1, which is provided between the die and the material supply cylinder, is in close contact with an end face of the die and closes the inside of the heating vessel, and a retracted position allowing passage of the metal material. Injection device of a metal material, characterized in that it comprises a blocking member for reciprocating. 3. An injection apparatus for a metallic material according to claim 2, wherein said blocking member is configured to scrape off the cutting chips of the metal material that the dice cut when moving from the retracted position to the advanced position. In molding a molded article by the injection apparatus according to claim 2, when the metal material is supplied from the material supply cylinder to the heating cylinder through the die, and after the injection is completed and the plunger is retracted, the blocking member is A method of injection molding a metal material, characterized in that the degassing of the heating cylinder is performed by operating the suction device when the heating cylinder is closed.