DE112005000190T5 - injection molding machine - Google Patents

Abstract

Injection molding apparatus comprising:
a mold (1), a sleeve (27) arranged to be movable forward and backward toward a pouring port (4) of the mold (1), a piston (33, 33a) slidable in said mold Sleeve and heating means (37) for heating and melting a raw material piece (A) fed into a raw material receiving part formed by an inner wall of the sleeve and the piston, characterized in that the piston (33, 33a ) and / or the sleeve (27) are equipped with means for cooling or is.

Description

Technical area:

The The present invention relates to an injection molding apparatus, and more particularly a device for the vacuum injection molding a metal with a high melting point is suitable, in particular an active metal such as an amorphous alloy, and which is capable of injection molding a melt of the active Metal to perform at high speed, while a pure state of the same is maintained.

State of the art:

In recently, Time was considered an injection molding process, which is capable of having a shaped article without cavities to cast an active metal, an injection molding process or molding method proposed which uses a sleeve in the direction is movable on a mold, and which is carried out by a raw material piece or -piece is fed into a raw material receiving part passing through an inner wall a sleeve and the upper end surface is formed therein a slidably arranged piston, the active Metal is heated in a vacuum and melted and placed in a cavity the form injected and filled (See Japanese Patent No. 2977374, JP 10-296424A and JP 2001-246451 A).

at a conventional one Die casting machine using an injection temperature of about 800 ° C (the kind that a big one Amount of molten metal used and with a molten bath for feeding the molten metal is provided), a piston or a sleeve section chilled (see JP 43-28806B). In the above-mentioned vacuum injection molding machine, the injection at a higher Temperature of about 1200 ° C or do more, but no cooling a piston or a sleeve, such as they in the above mentioned Patent documents is disclosed. In addition, no piston ring for a Head section of the piston used.

Of the The reason for this, that in the vacuum injection molding machine no cooling is made, is as follows. Since these die casting of a Cold chamber system and uses a system in which a Raw piece by batch processing in the raw material receiving part of the upper one Part of the sleeve is molten, the material to be used is small, and it is therefore not necessary lower the temperature of the molten metal.

There in the conventional Vacuum injection molding machine, the piston or the sleeve can not be cooled, there is a big one Probability that while injecting molten metal into a small gap between the inner surface the sleeve and the side of the piston flows and frozen in it. As a result, the frictional resistance increases, and in the worst case, the piston in the sleeve becomes immobile and can not Effect injection.

If for the sleeve, the heat resistance assuming a ceramic is used, it is possible that the sleeve itself is destroyed by the resistance of the solidified metal, when the piston is actuated is, and the molten metal can out of the sleeve in a vacuum chamber squirt.

Further it had been thought that if the sleeve and the piston of the above-mentioned Vacuum injection molding machine provided with a cooling mechanism are, the temperature of the molten metal is not increased and the injection process can not be performed. Therefore, there was in conventional vacuum injection molding machines the dilemma that the piston and the sleeve are not cooled and consequently the tendency was that the ones described above Problems are caused.

Disclosure of the invention:

problems to be solved by the invention The present invention has been made in view of the above-described State of the art made, and their fundamental task exists to provide a device capable of forming a molded article high quality in which a melt of a metal which heats up and was melted, hardly in a space between a piston and a sleeve flows, the sliding movement of the piston in the sleeve are carried out smoothly can and therefore the injection process are carried out stably can, even in injection molding a metal with a high melting point, which has a melting point of about 1200 ° C or more Has.

A Another object of the present invention is to provide a device even in the case of an active metal such as an amorphous alloy, the injection molding of the active metal continuously with a raw material charge, without the vacuum state to pick up in the room of a heating fusion section, and the one Mass production of the injection molded article of high quality at low Perform costs can.

Means for releasing the problems:

Around to solve the above problems, will according to one fundamental aspect of the present invention, an injection molding apparatus specified, comprising: a mold, a sleeve, the arranged so that they move forward and backwards in the direction on a sprue the shape is movable, a piston, which is slidably disposed in the sleeve is and heating means for heating and melting a raw material piece, which in a raw material receiving part supplied was made by an inner wall of the sleeve and the above Piston is formed, characterized in that said Piston and / or said sleeve with a means of cooling Is provided.

According to one embodiment, which can carry out the injection molding continuously by means of a raw material charge, there is provided an injection molding apparatus comprising: a mold, a sleeve, the is arranged under the mold so as to move forwards and backwards towards a pouring opening of the mold is movable, one in the sleeve sliding piston, heating means for heating and melting a Raw material lump which into a raw material receiving part supplied is formed by an inner wall of the sleeve and the piston is, and raw material supply means for feeding of the raw material piece of above to the above-mentioned raw material receiving part, characterized that the above-mentioned piston and / or the above sleeve with Means for cooling is provided. Preferably, the above-mentioned raw material piece supply means a pickup device containing a plurality of raw material pieces, means for transporting the raw material pieces arranged in the receiving device to one upper position above the device and means for transporting of the transferred to the upper position of the recording device Raw material lump to a position above the sleeve.

According to one preferred embodiment said piston has an interior formed therein and extending along its axial direction and a coolant supply pipe, which is arranged in the interior so that it has a space portion around its circumference, i. around its leading end section in the Near one Free piston head part and the circumference of a pipe wall around, so that a coolant, which is supplied through said coolant supply pipe, through the interior of said piston from its leading Flow out of the end can. On the other hand, said sleeve on its outer peripheral surface with a cooling jacket provided that a flow path has, the bellows-shaped or wave tube-like in the peripheral wall is formed. Preferably is the cooling jacket divided.

According to one another preferred embodiment be for the piston and the sleeve used different materials. When the piston and the Sleeve like that are that they have different thermal expansion coefficients this is effective for preventing the emergence of a gap between them. For example, said piston is made of a metal or a Alloy formed, which has a melting point of not less as 800 ° C has such as Fe, Ni, Co, Mo, W, Ta and Nb, and a part or the entire piston is made of ceramic. On the other hand can said sleeve be made of ceramic.

Further it is also effective to have a piston ring in the outer peripheral surface of the Head portion of the piston or to form the piston so that he is a main body part and has a separate headboard.

Effect of the invention:

As described above, in the injection molding apparatus of the present invention, which has a mold, a sleeve disposed so as to be movable forward and backward toward a gate of the mold, a piston slidably disposed in the sleeve, and heating means Heating and melting of a raw material piece supplied into a raw material accommodating part formed by an inner wall of the sleeve and the pistons, the piston and / or the sleeve being provided with means for cooling flows a melt of a metal which heats up and was melted, hardly in a space between the piston and the sleeve. In particular, when the piston has an interior formed therein and extending along its axial direction, and a coolant supply pipe is disposed in the interior so as to have a space portion around its circumference, ie, around its leading End portion in the vicinity of a piston head part and the circumference of the tube wall leaves free, so that a supplied through the coolant supply pipe cooling medium can flow through the interior of said piston from its leading end, the coolant is supplied in a state in which there is little is influenced by the heating in the upper part, and the upper part of the piston can be efficiently cooled. Further, by using various materials for the piston and the sleeve to have different thermal expansion coefficients, it is possible to effectively prevent the formation of a gap between them. Accordingly, since the sliding movement of the piston in the sleeve can be low in resistance, the injection process can be performed without any problem in the sliding movement of the piston, and it is possible to stably produce high-quality cast articles.

By the combination of the injection mechanism with the raw material supply means Furthermore, it is even in the case of an active metal such as an amorphous alloy possible, the injection molding of the active metal continuously with a raw material charge perform, without lifting the vacuum state in the space of the heating fusion section, and the mass production of the injection-molded article higher quality at low cost.

Summary the drawings

1 Fig. 12 is a fragmentary sectional front view schematically showing an embodiment of the vacuum injection molding apparatus of the present invention.

2 Fig. 10 is a sectional view schematically showing an embodiment of a piston to be used in the vacuum injection molding apparatus of the present invention.

3 Fig. 12 is a fragmentary sectional side view schematically showing an embodiment of a sleeve and a cooling jacket to be used in the vacuum injection molding apparatus of the present invention.

4 is a plan view of the sleeve and the cooling jacket of 3 ,

5 is a sectional view of the sleeve and the cooling jacket of 3 taken along the line VV.

6 Fig. 15 is a fragmentary perspective view showing a raw material supply mechanism to be used in the vacuum injection molding apparatus of the present invention.

7 FIG. 12 is a fragmentary sectional side view showing the raw material piece feeding mechanism of FIG 6 shows.

8th FIG. 16 is a fragmentary plan view illustrating the raw material supply mechanism of FIG 6 shows.

9 Fig. 12 is a fragmentary sectional front view schematically showing an embodiment of the vacuum injection molding apparatus of the present invention, showing the discharge process of a molded article.

10 Fig. 12 is a fragmentary sectional view schematically showing another embodiment of the piston to be used in the vacuum injection molding apparatus of the present invention.

Description of the reference numbers:

1 : Shape, 2 : solid lower form, 3 : movable upper mold, 4 : Pouring hole, 5 : Cavity, 11 : movable plate, 12 : Clamping cylinder, 15 : Outlet opening " 16 : Ejector pin, 18 : Ejector cylinder, 20 : Vacuum housing, 24 : Vacuum chamber, 27 : Sleeve, 28 . 28a . 28b : Cooling jacket, 29a . 29b : Coolant flow path, 33 . 33a : Piston, 37 : High frequency induction heating coil, 38 : Headboard, 38a : upper headboard, 38b : lower headboard, 43 : Coolant supply pipe, 46 : Piston ring, 47 Photo: Raw material supply device, 48 : Turntable, 49 : cylindrical raw material receiving body, 50 : Poor, 51 : vertically floating pen, 52 . 54 : Cylinders and 55 : Collective feed.

Best mode for running the invention

The Characteristic feature of the injection molding apparatus of the present Inven tion is that, as described above, in the injection molding apparatus, one form, one sleeve, which is arranged so that it is forward and backward in Direction to a sprue the shape is movable, a piston which slidably disposed in the sleeve is, and includes heating means for heating and melting a Raw piece are determined, which is introduced into a raw material receiving part, which through an inner wall of the sleeve and the above Piston is formed, the piston and / or the sleeve with means for cooling are equipped and thus a melt of a metal, which heated was and has melted, hardly in a gap between the piston and the sleeve flows. That is, though the molten metal which has been heated to a higher temperature can easily flow into the space between the piston and the sleeve, the device is characterized by the fact that it is possible to this phenomenon prevent and cause the sliding movement of the piston in the sleeve smooth becomes.

The Inventors of the present invention have detailed Studies found that if the upper part of the flask is cooled as mentioned above and the melt of the heated molten metal is cooled quickly and in the state hardened, something in the space between the piston and the Sleeve flowed is possible is, another inflow to prevent the molten metal from entering the gap and Furthermore excessive cooling of the prevent molten metal. As a result, it is possible, to carry out the heating and melting of the metal piece, without To influence this too much, and the increase in sliding resistance is low, because the proportion, which is in the space between the piston and the sleeve flowed and is frozen, is low, and therefore there are none Difficulty in the sliding movement of the piston in the sleeve. The The present invention has been completed based on these findings.

To the Purposes of efficient cooling of the upper part of the piston, it is effective in the piston an interior space form; which extends along its axial direction, and a coolant supply pipe to arrange in this interior so that a space section around its Circumference around, that is, around his leader End section nearby a piston head part and the circumference of the tube wall remains free, so that one Coolant, which is supplied through said coolant supply pipe, through the interior of said piston from its leading End can flow along the peripheral wall. By training In such a structure, the fluid serving as a coolant is in delivered to a state in which it is only slightly is influenced by the heating in the upper part, and the Upper part of the piston can be cooled efficiently. Furthermore, it is to efficient cooling the upper part of the piston effectively, on the outer peripheral surface of the Sleeve one cooling jacket to arrange a corrugated or bellows-like flow path has, which is formed in its peripheral wall, preferably one split cooling jacket, so that its attachment can be easily performed, in combination with the cooling of the piston. Further, the use of different materials for the Piston and the sleeve such that they have different thermal expansion coefficients have, effectively for preventing the formation of a gap between them and for reducing the proportion of molten metal which is in the space between the piston and the sleeve flows. The use of different Types of materials are also effective in reducing the heat dispersion and while suppressing the rise of the temperature of the piston.

According to one preferred embodiment the injection molding apparatus of the present invention is this, in combination with the above-mentioned injection mechanism, with Raw material supply means to Respectively a piece of raw material provided from above into a raw material receiving part, passing through the inner wall the above sleeve and the piston is formed. As a result, it is possible to have a efficient raw material supply in a short time and minimize the stroke of the piston to the defect during operation to prevent which by the space between the piston and the sleeve is caused. Furthermore, this can be heated by a heat source Raw piece be efficiently introduced into a cavity of the mold. Preferably include the above raw material piece supply means a pickup device containing a plurality of pieces of raw material, means for transferring the raw material piece located in the receiving device to a upper position above the device and means for transfer of the raw material piece, which transfers to the upper position of the pickup was, to a position above the sleeve. By such an arrangement Is it possible, make the device compact and efficient transfer and to carry out an efficient supply of the raw material pieces.

As From the foregoing description, the injection molding apparatus of the present invention, although they are in the entire field of Injection molding not only of an active metal, such as an amorphous alloy, but also a high melting point metal, which has a melting point of about 1200 ° C or more, is applicable especially advantageous for injection molding of an active metal, such as an amorphous alloy that requires a vacuum chamber. By combining the injection mechanism with the above raw material piece supply means In particular, a plurality of pieces of raw material can be continuous and automatically to the raw material receiving part of the upper part the sleeve supplied without lifting the vacuum state in a vacuum chamber. Even if the active metal is used, which tends to be oxidized and overheated Therefore, it is possible to injection molding continuously and automatically perform under vacuum. As a result, it will it is possible mass production of high quality injection molded articles too low To carry out costs.

Examples:

in the The following are examples of the present invention Reference to the accompanying drawings described to other characteristics and features and describe effects of the present invention.

1 to 9 show an embodiment of a vacuum injection molding apparatus of the present invention. In the figures, reference designates 1 a shape that consists of a solid lower form 2 and a movable upper mold 3 is constructed. The lower form 2 that has a sprue 4 has is firmly attached to a main panel 7 attached, which has a circular opening 6 in the corresponding position, and they are sealed by a sealing member (not shown), such as an O-ring disposed between them. A plurality of columns 9 are parallel to each other from the main plate 7 from the top, and at its upper ends is a stationary plate 10 attached. Although in this embodiment, the number of columns 9 is four, there is no limit to this number, and there is the case with three or two, or a case with more than four columns. A moving plate 11 on these pillars 9 is attached, is designed by clamping cylinder 12 which are on the stationary plate 10 are mounted to be moved up and down. The movable upper mold 3 which cavities 5 that is in the interface with the solid bottom mold 2 are formed, is fixed to the lower part of the movable plate 11 by means of a fastening element 13 and a connecting element 14 (which integral with the fastener 13 can be fixed). This movable upper form 3 moves together with the rise and fall of the movable plate 11 up and down. Besides, have the movable plate 11 and the fastener 13 aligned outlet openings or vents 15 formed in predetermined positions thereof and sealing between every two elements of the movable plate 11, the fixing member 13 , the fasteners 14 , the movable upper mold 3 and the firm lower form 2 is accomplished in each case by sealing elements (not shown).

A plurality of Auswerterstiften 16 (Although the illustrated embodiment includes a pair, it may also be three or more corresponding to the number of cavities) is so in the mold 1 introduced them into the respective cavities 5 are vorschiebbar into it. A connecting rod 17 this ejector pins 16 is through the movable plate 11 and the fastener 13 guided and constructed so that the lower end surface of each ejector pin 16 with the upper surfaces of the mold cavities 5 can be made flush by being pushed upwards and by means of a stop means (not shown). When the moving plate 11 is raised after completion of the injection molding to a top dead center, the upper end surface of the connecting rod comes 17 with the lower end surface of a cylinder rod 19 an ejector cylinder 18 in contact, which on the stationary plate 10 is mounted so that it is aligned with the connecting rod. If the evaluator cylinder 18 is pressed, pushes the cylinder rod 19 the connecting rod 17 down, and the ejector pins 16 stand in the respective cavities 5 in front.

Furthermore, a cylindrical vacuum housing 20 which is suspended so that it is the movable upper mold 3 surrounds, at the bottom of the movable plate 11 fastened by means of a sealing element (not shown). On the other hand, a sealing frame 21 in a similar way to the surface of the main plate 7 attached to the corresponding position by means of a sealing element (not shown). When the moving plate 11 is lowered to the movable upper mold 3 to the attached lower mold 2 To clamp, the outer surface of the vacuum housing slides 20 on the inner surface of the Abdichtrahmens 21 via the material of a seal member (not shown) to form a sealed injection molding section space X.

Furthermore, a discharge cylinder 22 for cast articles on the main plate 7 mounted in a predetermined position (which for ease of illustration only in 9 shown), with an arm part 23 which is capable of approaching and retreating from the injection molding portion at a predetermined height.

On the other hand, a vacuum chamber 24 for forming a heating-melting portion space Y in a sealed manner below the main plate 7 arranged and held by a frame (not shown). The shutting off and the connection between the above-mentioned injection molding section space X and the heating melting section space Y in the vacuum chamber 24 be by closing and opening the opening 6 through a shield closure 26 performed by a lock cylinder 25 (for easier illustration only in 9 shown) so that it slides forward and backward while in contact with the underside of the main panel 7 located. Moreover, the shielding closure can also be of a pivoting type.

A line L1 (mold outlet pipe) of the vacuum evacuation system of a vacuum pump (which consists of a diffusion pump and a rotary pump) is connected to the mold outlet ports 15 connected in the moving plate 11 and the fastener 13 are formed to evacuate the Spritzgußabschnittsraum X until it reaches a predetermined degree of vacuum. Another line L2 is with the vacuum chamber 25 connected to evacuate the heating-melting section space Y until it reaches a predetermined degree of vacuum. Further, a mold air valve for releasing the vacuum state from the injection molding section space X and a vacuum reserve tank (not shown) are connected to the mold outlet line L1 so that the vacuum state in the injection section section space X immediately after the clamping of the movable upper mold 3 to the solid lower mold 2 can be trained.

Further, a container for an inert gas with the vacuum chamber 24 so that the heating and melting can be performed under an atmosphere of an inert gas such as argon, depending on a raw material to be used.

A cooling jacket of a type which is divided into two parts is in the vacuum chamber 24 in a position below the sprue 4 the firm lower form 2 and the opening 6 the main plate 7 arranged and aligned with these parts and on a cylindrical sleeve 27 placed so that it surrounds these. The sleeve 27 and the lower end portion of the cooling jacket 28 are stuck to a vertically floating plate 31 by means of a holding element 30 attached. This vertically floating plate 31 gets through a sleeve movement cylinder 32 pressed to the sleeve 27 and the cooling jacket 28 as a whole move back and forth while using a guide rod 36 be guided. When the sleeve movement cylinder 32 is pressed and the vertically reciprocating plate 31 is vertically moved back and forth, lift the sleeve 27 and the cooling jacket 28 in the direction of the sprue 4 the form 1 and they sink to the starting position.

On the other hand, the sleeve 27 and the cooling jacket 28 with a piston 33 provided, which is slidably disposed therein. This piston 33 is through an injection cylinder 35 which actuates it by means of a vertically reciprocating plate 34 is attached and which is suitable vertically in the sleeve 27 and the cooling jacket 28 to slide while passing through the guide rod 36 to be led.

A high frequency induction heating coil 37 is as a heating means in the periphery of the upper part of the sleeve 27 arranged. As a heating means, it is not limited to the high-frequency induction heating, and it is understood that any other known heating method, such as resistance heating, can be used.

As in 2 is shown includes the above-mentioned piston 33 a cap-like headboard 38 , a hollow body part 39 which is in this headboard 38 screwed, a hollow tube part 40 which is fixed to the lower end portion of this body part 39 attached, an upper base 41 at which the hollow tube part 40 attached, a lower base 42 , which stuck to this upper base 41 is attached, and a coolant supply pipe 43 whose lower end is at the upper base 41 mounted so that it is in the axial direction in the interiors of the above-mentioned parts headboard 38 , hollow body part 39 and hollow tube part 40 extends. The coolant supply pipe 43 is arranged so as to leave a space portion around its periphery, that is, around its leading end portion near the piston head part and the circumference of the pipe wall, said space portion communicates with a flow path 44 in the upper base 41 is formed, and the lower end of the coolant supply pipe 43 communicates with one flow path 45 in the lower base 42 is trained. Thus, a coolant, such as water and oil, flows out of the flow path through the coolant supply tube 45 supplied in the above-mentioned lower base part 42 is formed through the interior of the above-mentioned piston from the leading end of the coolant supply pipe 43 along the perimeter wall and gets out of the flow path 44 left out in the upper base 41 is trained. There are also two piston rings (which can have any number) 46 on the outer peripheral surface of the upper part of the above head part 38 placed so that their surfaces can be flush with this outer peripheral surface. With such a structure, the fluid is supplied as a coolant in a state where it is subjected to little influence by heating in the upper part, and the upper part of the piston can be efficiently cooled. For example, when the metal piece disposed in the upper end surface of the piston is heated and melted at about 1200 ° C, the temperature of the top end portion of the head portion becomes 38 about 800 to 900 ° C, and that of the part of the coolant supply pipe 43 near the leading end will reach about 500 to 600 ° C. As material for the headboard 38 Incidentally, a ceramic is preferred, which is exposed to a high temperature.

On the other hand, as described above, the cooling jacket 28 of the split type at the circumference of the sleeve 27 so fastened that he surrounds her as in 3 to 5 is shown. The coolant flow paths 29a and 29b that have bellows or corrugated tube shape are in the side walls of the respective shell sections 28a and 28b independently formed, and the coolant tubes 29 are each at these coolant flow paths 29a and 29b attached (see also 6 ).

In the vacuum chamber 24 is a raw material piece feeding device 47 near the above-mentioned sleeve 27 arranged. This raw material piece feeding device 47 includes a turntable 48 , a plurality of cylindrical raw material receiving bodies 49 in the form of an upright cylinder installed on the turntable in such a positional relationship that its upper end coincides with the height position of said sleeve 27 (although four of these bodies are illustrated in the illustrated embodiment, two or three or more than five may be used), a vertically reciprocating stylus 51 as a means for transferring the raw material piece A contained in the cylindrical raw material receiving body 49 is placed, serves up, and an arm 50 acting as means for transferring the raw material piece A, which is at an upper position above the cylindrical raw material receiving body 49 was transferred to a position above the sleeve, as in 6 to 8th is shown. The turntable 48 and the cylindrical raw material accommodating bodies installed thereon 49 form a cartridge receiving device, and after all the pieces of raw material contained in the respective cylindrical raw material receiving bodies 49 are replaced, they are replaced as a whole by a new cassette receiving device.

The turntable 48 has hole sections 53 , which are formed in positions in which the cylindrical raw material receiving body 49 be installed. The vertically reciprocating pen 51 who is in this hole section 53 is inserted, transfers the raw material pieces A, which in the cylindrical raw material receiving body 49 are picked up, in turn, gradually upward, by operation of a cylinder 52 , When feeding raw materials attacks, as in 7 and 8th shown is the arm 50 the raw material piece A coming from the cylindrical raw material accommodating body 49 protrudes, he moves by the operation of a cylinder 54 and throws the piece of raw material A from a position above the sleeve 27 in the sleeve 27 , After the arm 50 has returned to the original position, becomes the cylinder 52 again actuated to those in the cylindrical raw material receiving body 49 transferred raw material piece one step up to transfer. After repeating these steps and after the consumption of all pieces of raw material A, which in a cylindrical raw material receiving body 49 were detected by a load sensor, the cylinder becomes 52 pressed around the vertically reciprocating pen 51 to move down, leaving it out of the hole section 53 is pulled out. Thereafter, a stepping motor (not shown) rotates about the turntable 48 only to rotate by a predetermined angle, so that the hole section 53 of the next cylindrical raw material receiving body 49 on the vertically reciprocating pen 51 lies. In this way, the raw material pieces A, which are in the cylindrical raw material receiving body 49 are added, piece by piece in the sleeve 27 fed.

Next, the injection molding process using the above-mentioned apparatus will be described. First, in a state where a raw material piece A is disposed in the raw material receiving part, which passes through the inner wall of the sleeve 27 and the piston 33 is formed, an electric current through the high-frequency induction heating coil 37 passed, and the raw material is heated and melted. At this time, the movable upper mold is 3 to the solid lower mold 2 clamped, the Va Cooling extraction of the Spritzgussabschnittsraums X in the vacuum housing 20 is performed and the device is ready for injection molding.

After the molten metal in the sleeve 27 has reached a predetermined temperature (the measurement of the temperature may be performed using any suitable method, such as a thermocouple placed in the piston 33 or a radiation pyrometer disposed in the fixed lower mold), the high-frequency induction heating coil 37 demagnetized, the lock cylinder 25 is pressed to the shield closure 26 and the injection molding section space X communicates with the heating melting section space Y. At this time, the sleeve moving cylinder becomes 32 and the injection cylinder 35 synchronously operated, thus become the sleeve 27 and the piston 33 raised until the top of the sleeve 27 in close contact with the circumference of the sprue 4 the form 1 device, and at the same time this is done by the piston 33 which has been further raised to a predetermined distance, pressurized molten metal into the mold cavities 5 sprayed and filled, and it freezes quickly because of its heat through the mold 1 and it is finally formed. Because the shape 1 is evacuated at the ejector portion, the end side of the flow of the molten metal through the mold outlet opening 15 the movable plate 11 forms, and the flow of molten metal follows the outlet flow and into the mold cavities 5 is filled, airborne contamination can not easily occur.

After completion of the injection molding, the sleeve tighten 27 and the piston 33 back to their starting position, the shielding closure 26 is closed, then the movable plate 11 through the clamping cylinder 12 raised and the shape 1 will be opened as in 9 is shown. When the moving plate 11 reaches the top dead center, the upper end surface of the connecting rod 17 the ejector pins 16 assume a state in which they on the lower end surface of the cylinder rod 19 the ejector cylinder 18 abuts. Since the solidified molded article B from the fixed lower mold 2 together with the movable upper mold 3 is disconnected, at this stage, the ejector cylinder 18 pressed to the Auswerterstift 16 projecting downwardly, whereby the molded article B from the movable upper mold 3 is separated and he on the firm lower form 2 is dropped. Thereafter, the discharge cylinder 22 for molded articles, and the arm section 23 moves forward, grips the molded article B and then pulls back to remove the molded article B from the device. After discharging the molded article, the clamping cylinder becomes 12 pressed again to the shape 1 close and the next injection process is performed.

10 shows a modification of the piston. This piston 33a differs from the above-mentioned embodiment in that a collective feed 55 ("Collect Chuck") between a cap-like upper headboard 38a and a hollow lower headboard 38b is set. This collective feed 55 is between the top header 38a and the lower headboard 38b caulked by the upper head part 38a into the collective feed 55 is pressed. Further, a metal plate 56 so between the upper headboard 38a and the collective feed 55 set that top header 38a a coolant fluid, such as water, not touched. Further, two (the number may be arbitrary) piston rings 46 on the outer peripheral surface of the upper end portion of the lower header 38b mounted so that their surfaces are flush with this outer peripheral surface. The scaffold body part 39 By the way, in the lower headboard 38b screwed, the hollow tube part 40 becomes firm at the lower end of this body part 39 attached and the coolant supply pipe 43 is so in the interiors of the body part 39 and the hollow tube part 40 arranged so that it extends in the axial direction. As in the above-described embodiment, the coolant fluid such as water and oil supplied through the coolant supply pipe flows through the inside of the above-mentioned piston from the leading end of the coolant supply pipe 43 along the peripheral wall and is omitted. As material for the upper headboard 38a which is exposed to a high temperature, a ceramic is preferred. As another modification of the attachment of the upper head portion of the piston, screws, brazing, etc. may also be considered.

The use of the above-described injection mechanism has exhibited the effects shown in the following Table 1, as compared with a case of conventional sleeve and pistons which were not cooled (also, no piston ring was used). In the case of the present invention, the piston with the in 10 used structure shown. The cast alloy was an amorphous alloy (Zr ₆₀ Al ₁₅ Co _2.5 Ni _7.5 Cu ₁₅ alloy).

Table 1

Even though preferred embodiments the device according to the present invention Invention have been described above, is the present invention not limited to the embodiments described above, and any changes in the design can be applicable. Although the device of the present invention advantageously used in the injection molding of an active metal which tends to be oxidized and by heating impaired to be, such as an alloy, the at least one active metal element from the following group: Al, Mg, Fe, Ti, Zr, Hf, Y, La, Ce, Nd, Sm and Mm (mischmetal) the total amount of active metal elements in the alloy is not less than 50 atomic percent, it is not on this embodiment limited and can be used in the injection molding of various metals, which have a high melting point.

The apparatus of the present invention is particularly advantageously applicable to the injection molding of alloys having a composition represented by one of the following general formulas (1) to (6). M ¹ _a M ² _b Ln _c M ³ _d M ⁴ _e M ⁵ _f General formula (1) wherein M ^{1 represents} one or both of the two elements Zr and Hf, M ^{2 represents} at least one element selected from the group consisting of Ni, Cu, Fe, Co, Mn, Nb, Ti, V, Cr, Zn, Al, and Ga Ln represents at least one member selected from the following group: Y, La, Ce, Nd, Sm, Gd, Tb, Dy, Ho, Yb and Mm (mischmetal: aggregate of rare earth elements); M ^{3 represents} at least one element from the following group: Be, B, C, N and 0; M ^{4 represents} at least one element selected from the following group: Ta, W, and Mo; M ^{5 represents} at least one element selected from the following group: Au, Pt, Pd and Ag; and a, b, c, d, e, and f represent such atomic percentages each satisfying 25 ≦ a ≦ 85, 15 ≦ b ≦ 75, 0 ≦ c ≦ 30, 0 ≦ d ≦ 30, 0 ≦ e ≤ 15 and 0 ≤ f ≤ 15. Al _{100 ghi} Ln _g M ⁶ _h M ³ _i General formula (2) wherein Ln represents at least one member selected from the following group: Y, La, Ce, Nd, Sm, Gd, Tb, By, Ho, Yb, and Mm; M ^{6 represents} at least one member selected from the following group: Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb, Mo, Hf, Ta and W; M ^{3 represents} at least one element selected from the following group: Be, B, C, N and 0; and g, h and i are atomic percentages Represent proportions each satisfying the following relationships: 30 ≦ g ≦ 90, 0 ≦ hs 55, and 0 ≦ i ≦ 10. Mg _100-p M ⁷ _p General formula (3) wherein M ^{7 represents} at least one element selected from the following group: Cu, Ni, Sn and Zn; and p represents an atomic percentage falling within the range 5 ≤ p ≤ 60.

This amorphous alloy has a large negative enthalpy of mixing and good producibility of the amorphous structure. Mg _100-qr M ⁷ _q M ⁸ _f General formula (4), wherein M ^{7 represents} at least one element selected from the following group: Cu, Ni, Sn and Zn; M ^{8 represents} at least one element selected from the following group: Al, Si and Ca; and q and r represent atomic percentages that satisfy the following relationships: 1 ≤ q ≤ 35 and 1 ≤ r ≤ 25.

Filling the gaps in the amorphous structure of the alloy of the above general formula (3) with the element M ⁸ having a small atomic radius (Al, Si or Ca) as in this amorphous alloy makes the structure stable and increases Producibility of the amorphous structure. Mg _100-qs M ⁷ _q M ⁹ _s General formula (5), Mg _100-qrs M ⁷ _q M ⁸ _r M ⁸ _r M ⁹ _s General formula (6), wherein M ^{7 represents} at least one element selected from the following group: Cu, Ni, Sn and Zn; M ^{8 represents} at least one element selected from the following group: Al, Si and Ca; M ⁹ represents at least one element selected from the following group: Y, La, Ce, Nd, Sm and Mm; and q, r and s represent atomic percentages each satisfying the following relationships: 1 ≦ q ≦ 35, 1 ≦ r ≦ 25 and 3 ≦ s ≦ 25.

The Addition of a rare earth element to the alloy of the general Formula (3) and (4) increase, as with these amorphous alloys, the thermal stability the amorphous structure.

Under others of the above amorphous alloys have the amorphous alloys Zr-TM-Al and Hf-TM-Al (TM: transition metal (English: transition metal)), which is a very large distance between the glass transition temperature (Tg) and the crystallization temperature (Tx) have a high Strength and high corrosion resistance, they possess wide undercooled liquid areas (Glass transition regions) ΔTx = Tx - Tg of not less than 30 K and extremely wide supercooled liquid areas of not less than 60 K in the case of the amorphous alloys Zr-TM-Al. In In the above temperature ranges, these amorphous alloys prove a very satisfactory processability due to the viscous flow, even at a low load of not more than a few 10 MPa. They are characterized by being easily manufactured and are very stable, as evidenced by the fact that they are able to provide an amorphous solid material even by a casting process, which is a cooling rate in the order of magnitude used by some 10 K / s. Even by the casting of a melt and the casting process, which uses the viscous flow that reaches the glass transition area also uses These alloys produce amorphous materials and allow them a faithful reproduction of the shape and size of a mold cavity.

The amorphous alloys Zr-TM-Al and Hf-TM-Al to be used in the present invention have a very wide range of ΔTx although it varies with the composition of the alloy and the method of determination. For example, the alloy Zr ₆₀ Al ₁₅ Co _2.5 Ni _7.5 Cu ₁₅ (Tg: 652 K, Tx: 668 K) has a very broad ΔTx of 116 K. The Vickers hardness (Hv) of this alloy at temperatures between Room temperature and a temperature near Tg is 460 (DPN), the tensile strength thereof is 1,600 MPa, and the bending strength thereof is up to 3,000 MPa. The thermal expansion coefficient a of this alloy is very small between room temperature and a temperature near Tg of 1 × 10 ^-5 / K, the Young's modulus thereof is 91 GPa, and its elastic limit in a compressed state exceeds 4 to 5 percent. Further, the toughness of the alloy is high, so that the value of Charpy impact strength falls in the range of 60 to 70 kJ / m ² . In this alloy, the flow load is lowered to a value near 10 MPa as it heats up to its glass transition region while having properties such as very high strength as mentioned above. This alloy is therefore characterized in that it can be processed very easily and can be processed with little stress into minute parts and parts of high precision with a complicated shape. Moreover, due to the properties of the so-called glass substance (amorphous substance), this alloy is characterized by allowing the production of molded articles, with surfaces of extremely high smoothness, and in that they have substantially no possibility for the Forming a step that would occur if a sliding belt would appear on the surface, such as during the deformation of a crystalline alloy.

in the Generally, an amorphous alloy begins to crystallize when They go up to their glass transition area heated and in this for a long time is kept. In contrast, the above alloys that have such a wide range ΔTx as above mentioned have a stable amorphous phase and they avoid forming a crystal for a period of up to two hours when at a temperature which is selected in the range ΔTx. The user of this Alloys therefore need not fear that during the Standardgießprozesses a crystallization occurs.

The These alloys have these properties fully during the Course of their transformation from the molten state to solidified state. In general, the production requires a amorphous alloy a fast cooling. In contrast, allow the alloys mentioned a slight production of a solid material a single amorphous phase from a melt by cooling, which at a rate of about 10 K / s is effected. The resulting solid solid material has Furthermore a very smooth surface. The alloys have a transferability, leaving even a scratch in the order of magnitude of micrometers, which by polishing work on the surface of a Form has occurred, reliable is reproduced.

If the said alloys are used as material for casting, Must use the mold to manufacture the cast article is, just a surface which is adapted to meet the surface quality of the cast Article is expected because the molded product the surface quality of the mold faithfully reproduced, and therefore these alloys allow the Steps to adjust the size and the surface roughness of the cast article are omitted or reduced.

The Characteristics of said amorphous alloys, including in Combination the relatively low hardness, the high tear strength, the high flexural strength, the relatively low Young's modulus, the high elastic limit, the high impact resistance, the high resistance to wear, the smoothness of the surface and the highly accurate castability make these alloys for use as a material for cast Articles suitable in various fields, such as for precision parts, the ferrules, capillaries, sleeves or V-notched substrates in optical connectors, gears and micro machines become. Because the amorphous alloy has a highly accurate castability and machinability as well as excellent portability, which is able to faithfully reproduce the contour of the cavity of the mold, the cast articles that obey a dimensional specification, to meet a dimensional accuracy and a surface quality, by the molding process produced in a single process with a high mass productivity provided that the form to be used is prepared in an appropriate manner is.

When a material for the manufacture of the cast article from an amorphous alloy is used for to which the present invention is applied may be any amorphous hitherto known alloys except the amorphous alloys mentioned above, For example, amorphous alloys disclosed in JP 10-186176, JP 10-311923, JP 11-104281 and JP 11-189855 are. The teachings of these patents are by reference included in the present specification.

Industrial Applicability:

The Injection molding apparatus of the present invention is suitable for production of different molded articles of different metals, especially active metals such as amorphous alloys.

Summary

There is provided a device capable of performing injection molding with a high melting point metal. The injection molding apparatus comprises a mold ( 1 ), a sleeve ( 27 ), which is arranged so that it moves forwards and backwards in the direction of a pouring opening ( 4 ) of the mold is movable, a piston ( 33 . 33a ) slidably disposed in the sleeve, heating means ( 37 ) for heating and melting a raw material piece (A) fed into a raw material receiving part formed by an inner wall of the sleeve and the above-mentioned pistons, and raw material piece supply means (A) 47 ) for feeding the raw material piece from above to the above raw material receiving part. To ensure that a melt of a metal, which has been heated and melted, hardly flows into a gap between the piston and the sleeve, the above-mentioned piston and / or the sleeve is provided with means for cooling.

Claims (11)

An injection molding apparatus comprising: a mold ( 1 ), a sleeve ( 27 ), which is arranged so that it moves forwards and backwards in the direction of a pouring opening ( 4 ) the form ( 1 ) is movable, a piston ( 33 . 33a ), which is slidably disposed in the sleeve, and heating means ( 37 ) for heating and melting a raw material piece (A) which is fed into a raw material receiving part, which is formed by an inner wall of the sleeve and the piston, characterized in that the piston ( 33 . 33a ) and / or the sleeve ( 27 ) are equipped with means for cooling or is. An injection molding apparatus comprising: a mold ( 1 ), a sleeve ( 27 ), which are below the shape ( 1 ) is arranged so that it forwards and backwards in the direction of a pouring opening ( 4 ) of the mold is movable, a piston ( 33 . 33a ) slidably disposed in the sleeve, heating means for heating and melting a raw material piece (A) supplied into a raw material receiving part formed by an inner wall of the sleeve and the piston, and raw material piece supply means (A); 47 ) for feeding the raw material piece from above into the raw material receiving part, characterized in that the piston ( 33 . 33a ) and / or the sleeve ( 27 ) are provided with means for cooling or is. Device according to claim 1 or 2, characterized in that the piston ( 33 . 33a ) has an interior formed therein and extending along its axial direction, and a coolant supply pipe (10). 43 ) disposed in the inner space so as to expose a space portion around the portion of its leading end in the vicinity of a piston head and around the circumference of a pipe wall, so that a coolant supplied through the coolant supply pipe through which the interior of the piston can flow from its leading end. Device according to one of claims 1 to 3, characterized in that the sleeve ( 27 ) on its outer circumferential surface with a cooling jacket ( 28 . 28a . 28b ), which has a flow path ( 29a . 29b ), which is formed in its peripheral wall bellows or wave tube-shaped. Device according to claim 4, characterized in that the cooling jacket ( 28 . 28a . 28b ) is shared. Device according to one of claims 1 to 5, characterized in that the piston ( 33 . 33a ) is formed of a metal or a metal alloy having a melting point of not less than 800 ° C. Device according to one of claims 1 to 5, characterized in that a part of the piston ( 33 . 33a ) or the entire piston ( 33 . 33a ) is formed of ceramic. Device according to one of claims 1 to 7, characterized in that a piston ring ( 46 ) in the outer peripheral surface of a head portion of the piston ( 33 . 33a ) is arranged. Device according to one of claims 1 to 8, characterized in that the piston ( 33 . 33a ) a main body part and a separate head part ( 38 . 38a . 38b ) Has. Device according to one of claims 1 to 9, characterized in that the sleeve ( 27 ) is formed of ceramic. Device according to one of claims 2 to 10, characterized in that the raw material piece supply means ( 47 ) a receiving device ( 48 . 49 ) containing a plurality of pieces of raw material (A), means ( 51 . 52 ) for transferring the piece of raw material arranged in the receiving device to an upper position above the device, and means ( 50 . 54 ) for transferring the raw material piece which has been transferred to the upper position of the receiving device to a position above the sleeve.