JP4325411B2 - Casting machine injection equipment - Google Patents

Description

  The present invention relates to an injection apparatus for a casting machine, and more particularly, to a sealing technique that eliminates vacuum leakage by bringing stalk into close contact with a sleeve.

  For example, as an injection device used in a casting machine for producing an aluminum cast product, pressure is applied to the surface of a molten metal such as an aluminum alloy filled in a container, and the molten metal is pushed up by the action of the applied pressure. There has been proposed a structure in which a molten metal is supplied to a sleeve (see, for example, Patent Document 1 and Patent Document 2).

In each of the low-pressure casting apparatuses described in Patent Documents 1 and 2, a recess is formed in the furnace lid of a molten metal container filled with molten aluminum, and a stalk flange is fitted into the recessed part, whereby the stalk is placed in the molten metal container. It is fixed.
JP 2000-271722 A (3rd and 4th pages, FIG. 1) JP 2003-112249 A (2nd and 3rd pages, FIG. 1)

  These low pressure casting apparatuses described in Patent Documents 1 and 2 have a structure in which a Stoke flange portion is fitted into a recess formed in a molten metal container, and the Stoke flange portion is brought into close contact with an intermediate Stoke or a mold.

  However, since stalk is usually formed by putting ceramics in a wooden mold, the dimensional tolerance is large, and the contact surface of the flange part in contact with the intermediate stalk or mold is not horizontal or spilled. There is a possibility that a gap will be formed in this, and a vacuum leak may occur from this gap. For this reason, air may enter the stalk from the gap, and air may enter the casting as a result of air mixing with the molten metal. Therefore, the quality of the cast product is lowered and the operating rate of the casting machine is lowered.

  Accordingly, an object of the present invention is to provide a casting machine injection device that eliminates the gap between the sleeve and the stalk, prevents air from entering the molten metal, and increases the operating rate of the casting machine. .

An injection apparatus for a casting machine according to the present invention includes a molten metal holding furnace, a stalk, a sleeve, a platen that fixes the sleeve and a mold, and a stalk positioning means that positions and holds the stalk with respect to the sleeve. In this injection device, the stalk receiving member for inserting and fitting the stalk is attached to the stalk holding plate, and the contact portion between the stalk receiving member and the stalk is formed into a fitting shape having an arc shape. On the other hand, the stalk is made minutely movable. Further, in this injection apparatus, the stalk holding plate is attached so as to be rotatable in the horizontal direction with respect to the main body with the one end side as an axis.

  According to the casting machine injection device of the present invention, the contact portion between the stalk receiving member and the stalk has an arcuate fitting shape, and the stalk has a structure that is minutely movable with respect to the stalk receiving member. Even if the end face of the tip is not a horizontal plane, the stalk can move slightly and the stalk tip can be brought into close contact with the stalk contact hole to make a surface contact, eliminating the gap between the sleeve and the stalk. Can do.

Therefore, according to the present invention, it is possible to prevent air from entering the molten metal sucked into the stalk, and it is possible to manufacture a high-quality cast product without bubbles and to increase the moving efficiency of the casting machine. be able to.
Further, according to the injection device of the casting machine of the present invention, since the stalk holding plate is attached to the main body portion so as to be rotatable in the horizontal direction, it is safe without moving the molten metal holding furnace under the stalk. The stalk can be moved to a place, and the stalk can be exchanged .

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

[Configuration of injection machine of casting machine]
1 is a front view of an injection device of a casting machine, FIG. 2 is a side view of the injection device of the casting machine, FIG. 3 is a plan view of the injection device of the casting machine, and FIG. 4 shows an open state and a closed state of a stalk holding plate. FIG. 5 is an enlarged side view of an essential part showing an enlarged contact portion between a sleeve and Stoke, FIG. 6 is an enlarged cross-sectional view of Stoke, and FIG. 7 is a heater to which a molten metal splash prevention cover is attached. The cover is shown, (A) is a sectional view, (B) is a bottom view, and FIG. 8 is an enlarged sectional view of a stalk receiving member.

  As shown in FIG. 1 to FIG. 5, the injection device of the casting machine in the present embodiment sucked up the molten metal holding furnace 2 that accommodates the molten metal 1, the stalk 3 that sucks up the molten metal 1 in the molten metal holding furnace 2, and the stalk 3. A sleeve 6 having a flow path 5 for filling the mold 4 with the molten metal 1, a platen 7 for fixing the sleeve 6 and fixing the mold 4, and a Stoke positioning means for positioning and holding the stalk 3 with respect to the sleeve 6 And.

  The molten metal holding furnace 2 is filled with a molten metal 1 in which, for example, an aluminum alloy is melted. The molten metal holding furnace 2 is provided with a heater (not shown) so that the molten metal 1 is not hardened by the heat of the heater.

  The sleeve 6 is fixed to a platen 7 that fixes the mold 4 through its plate thickness. The sleeve 6 is formed with a flow path 5 for supplying the molten metal 1 sucked up by a stalk 3 described later into the cavity of the mold 4. The flow path 5 is formed along the axial center of the cylindrical sleeve 6.

  A molten metal injection portion 8 for feeding the molten metal 1 in the flow path 5 into the mold 4 is provided at the tip of the sleeve 6 that protrudes outward from the platen 7. The molten metal injection portion 8 has an injection piston (not shown) that is inserted into the sleeve 6 so as to be movable forward and backward. The molten metal 1 sucked into the sleeve 6 by the injection piston is transferred to the mold 4. Let it fire.

  The mold 4 has a cavity for forming a cast product as a product, and the molten metal 1 is filled in the cavity and cooled to form a cast product. The mold 4 is fixed to the platen 7. The molten metal 1 is supplied to the cavity of the mold 4 from the tip of the platen 7 through the gate.

  As shown in FIG. 6, the sleeve 6 includes a Stoke tube portion 9, a tip piece 10 attached to the tip of the Stoke tube portion 9, and an orifice 11 attached to the rear end of the Stoke tube portion 9. ing.

  The stalk tube portion 9 is formed as a cylindrical pipe having a molten metal suction channel 12 that penetrates the central portion along the axial direction. The distal end piece 10 has a so-called frustoconical shape in which the diameter gradually increases from the distal end portion serving as a connection portion with the sleeve 6 to the proximal end portion.

  The tip surface 10 a of the tip piece 10 is a substantially horizontal flat surface so as to be in close contact with the stalk contact hole 13 (see FIG. 5) formed in the sleeve 6 via the packing 14. On the other hand, the end face 10b which is the base end portion of the tip piece 10 is a contact portion with a stalk receiving member described later, and has a fitting shape which is the same arc shape as the stalk receiving member. The tip piece 10 is formed with a molten metal supply channel 15 communicating with the molten metal suction channel 12.

  The orifice 11 is attached to the proximal end portion of the Stoke tube portion 9 on the side opposite to the side to which the distal end piece 10 is attached. In the orifice 11, a suction channel 16 for supplying the molten metal 1 filled in the molten metal holding furnace 2 to the molten material suction channel 12 of the stalk tube portion 9 is formed. The suction channel 16 is a channel having a narrower channel cross-sectional area than the molten metal suction channel 12, and functions as an orifice.

  The Stoke tube portion 9 and the tip piece 10 are integrated by, for example, bonding and fixing molded products formed by putting ceramics into a wooden mold. The orifice 11 is made of, for example, graphite, and is fixed by inserting and adhering the distal end portion thereof into the molten metal suction channel 12 of the stalk tube portion 9.

  As shown in FIGS. 1 and 2, a heater cover 17 having heating means for heating the melt 1 sucked up in the melt suction channel 12 is provided around the outer periphery of the stalk 3. It is done. As shown in FIG. 7, the heater cover 17 is formed as a cylindrical body having an insertion hole portion 18 that is a stalk accommodation hole for allowing the stalk tube portion 9 to be inserted into the stalk tube portion 9 in a loosely fitted state. A heater 19 as a heating means is spirally incorporated in the cylindrical portion of the heater cover 17.

  At one end of the heater cover 17, a flange portion 20 for screwing the heater cover 17 to a stalk holding plate described later is formed. On the other hand, a molten metal splash prevention cover 21 for preventing the molten metal 1 in the molten metal holding furnace 2 from jumping up into the heater cover 17 is attached to the other end (lower end portion) of the heater cover 17. By attaching the molten metal splash prevention cover 21 to the lower end portion of the heater cover 17, the molten metal 1 can be prevented from jumping up to the heater 19, and the heater 19 can be prevented from being short-circuited.

  The molten metal splash prevention cover 21 has a disk shape that covers the lower end portion of the heater cover 17 and has an insertion hole 22 through which the stalk tube portion 9 is inserted. The molten metal splash prevention cover 21 is formed with a cover attachment piece 23 serving as an attachment portion for attaching the molten metal splash prevention cover 21 to the heater cover 17. The molten metal splash prevention cover 21 is fixed to the heater cover 17 by fastening the cover mounting piece 23 with a screw 24. And the heat insulating material which abbreviate | omits illustration is packed into the clearance gap between the insertion hole 22 and the Stoke tube part 9 which were formed in the molten metal splash prevention cover 21. FIG.

  As shown in FIGS. 1 to 3, the stalk positioning means includes a main body 25 slidably attached to the platen 7, a stalk holding plate 26 attached to the lower end of the main body 25, and the stalk holding means. A stalk receiving member 27 which is attached to the plate 26 and inserts and fits the stalk 3; have.

  The main body 25 includes a pair of left and right brackets 29 having guide rails 28 and a connecting member 30 fixed between the brackets 29. The bracket 29 has a guide rail 28 formed from the upper end to the lower end in the height direction, and has a plate fixing portion 31 for attaching the stalk holding plate 26 to the base end side thereof. The connecting member 30 is fixed so as to connect the brackets 29 and 29 to a position slightly above the intermediate position between the pair of brackets 29 and 29 arranged with the longitudinal direction thereof oriented in the vertical direction.

  The main body 25 is provided with a stopper pin 32 for restricting the slide position of the main body 25. The stopper pin 32 is fixed through the guide rail 28 at a position slightly below the position where the connecting member 30 is attached. Further, a guide holding member 33 for slidingly guiding the guide rail 28 is fixed to the platen 7. The guide holding member 33 has a substantially U-shaped guide groove 34 for slidingly guiding the guide rail 28, and a screw is attached to the guide holding member mounting base 35 fixed to the platen 7 by welding or the like. It has been stopped.

  Therefore, the main body 25 slides and guides the guide rail 28 in the guide groove 34 of the guide holding member 33 fixed to the platen 7 via the guide holding member mounting base 35, so that the direction indicated by the arrow Y in FIG. It is designed to move up and down.

  As shown in FIGS. 1 and 5, the stalk holding plate 26 includes a plate mounting recess 36 that fits and holds the stalk receiving member 27 at a substantially central portion, and a through hole that allows the stalk 3 to pass through the center of the plate mounting recess 36. 37. Further, the stalk holding plate 26 is formed with a plate mounting concave portion 38 for fixing the heater cover 17 by fitting and fixing the flange portion 20 of the heater cover 17 with screws.

  The stalk holding plate 26 is attached to the pair of brackets 29, 29 by a fixing screw 39 and an attaching / detaching screw 40. As shown in FIG. 4, the stalk holding plate 26 can be easily replaced by removing the detachable screw 40 and rotating it around the fixing screw 39 in the horizontal direction indicated by the arrow X in FIG. It has been made to be able to.

  As shown in FIGS. 5 and 8, the stalk receiving member 27 has a disk shape that is fitted into a plate mounting recess 36 formed in the stalk holding plate 26. The stalk receiving member 27 has a through hole 41 into which the stalk 3 is inserted in a loosely fitted state, and a stalk receiving portion 42 that supports the tip piece 10 of the stalk 3. The stalk receiving portion 42 is formed in an arc shape that is the same shape as the end face 10 b that is the base end portion of the tip piece 10. For this reason, since the end surface 10b and the stalk receiving portion 42 have the same circular arc shape, the stalk 3 is in contact with the stalk receiving member 27 in accordance with the joining surface of the tip of the tip piece 10 and the sleeve 6. It can move minutely and can float.

  As shown in FIGS. 1 and 2, the stalk lifting means has its front end abutted at a position opposite to the stalk 3 with the sleeve 6 interposed therebetween, and a hex nut 48 as a first nut is integrated. It comprises a lifting bolt 43 that is a Stoke lifting member, a lock nut 44 that is a second nut for fixing the lifting bolt 43, and a bush 45.

  The lifting bolt 43 has a threaded portion 46 at the main body portion, an arc-shaped contact portion 47 that contacts the upper end of the sleeve at the distal end, and a hex nut 48 at the proximal end. The lifting bolt 43 has a screw portion 46 screwed onto the connecting member 30 described above, so that the attachment position of the lifting bolt 43 can be adjusted up and down.

  The lock nut 44 is attached to the threaded portion 46 of the lifting bolt 43. The lock nut 44 is positioned and fixed so that the vertical position of the lifting bolt 43 is not shifted by being tightened to the connecting member 30.

  The bush 45 is formed of a cylindrical collar and is attached to a screw portion 46 between the lock nut 44 and the hexagon nut 48.

[Stoke attach / detach operation]
Next, a description will be given of the attaching / detaching operation of the stalk 3 in the casting machine injection apparatus configured as described above. First, as shown in FIGS. 1 and 4, the attaching / detaching screw 40 is loosened, and the stalk holding plate 26 is rotated to a position away from the platen 7 to be opened. Then, the stalk receiving member 27 is placed in the plate mounting recess 36 formed in the stalk holding plate 26. Next, the stalk 3 is inserted through the through hole 37 formed in the stalk receiving member 27. Then, the proximal end portion of the distal end piece 10 of the stalk 3 is fitted with the stalk receiving portion 42 having the same shape as the end surface 10b of the proximal end portion. In a state in which the stalk 3 is fitted to the stalk receiving portion 42, the stalk 3 is in a state of being slightly movable with respect to the stalk receiving member 27 in the direction around the axis and in the vertical direction.

  Next, the heater cover 17 is attached around the stalk 3, and the flange portion 20 of the heater cover 17 is screwed to the stalk holding plate 26. And after attaching the molten metal splash prevention cover 21 to the lower end part of this heater cover 17, the clearance gap between this molten metal splash prevention cover 21 and the stalk 3 is block | closed with a heat insulating material.

  Next, after the packing 14 is placed on the tip surface 10a of the tip piece 10, the stalk holding plate 26 is returned to the original position. Then, the detachable screw 40 is screwed into the plate fixing portion 31 of the guide rail 28 to fix the stalk holding plate 26 to the guide rail 28. Then, the hexagon nut 48 provided at the base end of the lifting bolt 43 is screwed into the connecting member 30 using a torque wrench. Then, the abutment portion 47 that is the tip of the lifting bolt 43 abuts on the sleeve 6, and the main body portion 25 integrated with the connecting member 30 that is screwed with the screw portion 46 about the lifting bolt 43 serves as the guide. The holding member 33 is raised using the guide.

  As the main body 25 is raised, the stalk 3 attached to the stalk holding plate 26 is also raised. And when the front-end | tip part of the stalk 3 closely_contact | adheres via the stalk contact hole 13 and the packing 14 of the sleeve 6, the lock nut 44 attached to the lifting bolt 43 is tightened and the height of the main-body part 25 is positioned. By tightening the lock nut 44, the tip of the stalk 3 can be prevented from being separated from the stalk contact hole 13 even when vibrations or the like are applied. As a result, it is possible to supply the molten metal 1 into the cavity of the mold 4 in a state where the tip of the stalk 3 and the stalk contact hole 13 are in close contact with each other without any gap.

[Action / Effect]
In the casting machine injection apparatus configured as described above, as shown in FIG. 5, the contact portion between the stalk receiving member 27 and the stalk 3 is formed into a fitting shape having an arc shape. On the other hand, since the stalk 3 has a structure that can be moved minutely, the stalk 3 can be slightly moved even if the end surface of the ceramic stalk tip portion whose dimensional accuracy is not high is not a horizontal plane. On the other hand, the tip portion of the stalk 3 can be brought into close contact with the surface. For this reason, a gap between the sleeve 6 and the stalk 3 can be eliminated, a vacuum leakage from this point can be suppressed, and the degree of vacuum can be stabilized. Therefore, since the degree of vacuum is stabilized, the molten metal 1 sucked up by the stalk 3 is prevented from being mixed with air, so that the quality is stabilized and the operating rate of the casting machine is improved.

  In addition, according to the injection device of the present embodiment, the contact between the stalk 3 and the sleeve 6 becomes uniform, so that the sleeve 6 can be prevented from being damaged due to the contact. Further, according to the injection device of the present embodiment, it is possible to easily position the stalk 3 and the sleeve 6.

  Further, in the injection device of the present embodiment, the tightening force of the stalk 3 against the sleeve 6 is quantitatively tightened with a torque wrench, and loosening is prevented by tightening on the principle of a double nut using a hex nut 48 and a lock nut 44. Therefore, a constant work can be performed regardless of the level of proficiency of the operator, and loosening due to the vibration of the casting machine can be prevented.

  Further, in the injection device of the present embodiment, since the molten metal splash prevention cover 21 is attached to the rear end portion of the stalk 3, the insertion hole in which the stalk 3 is accommodated even if the molten metal 1 in the molten metal holding furnace 2 jumps up. The molten metal 1 can be prevented from entering the portion 18. For this reason, the malfunction that the heater 19 incorporated in the heater cover 17 short-circuits with the molten metal 1 which bounces up can be eliminated.

  Further, in the injection device of the present embodiment, the stalk holding plate 26 is attached to the main body 25 so as to be rotatable in the horizontal direction, so that the molten metal holding furnace 2 under the stalk 3 does not move. The stalk 3 can be moved to a safe place, and the stalk 3 can be exchanged.

It is a front view of the injection device of a casting machine. It is a side view of the injection device of a casting machine. It is a top view of the injection device of a casting machine. It is a top view of the injection device of the casting machine which shows the open state and closed state of a stalk holding plate. It is a principal part enlarged side view which expands and shows the contact part of a sleeve and Stoke. It is an expanded sectional view of Stoke. The heater cover to which the molten metal splash prevention cover was attached is shown, (A) is sectional drawing, (B) is a bottom view. It is an expanded sectional view of a stalk receiving member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Molten metal 2 ... Molten metal holding furnace 3 ... Stoke 4 ... Mold 6 ... Sleeve 7 ... Platen 10 ... Tip piece 10b ... End surface of tip piece 17 ... Heater cover 19 ... Heater (heating means)
DESCRIPTION OF SYMBOLS 21 ... Molten splash prevention cover 25 ... Main-body part 26 ... Stoke holding plate 27 ... Stoke receiving member 28 ... Guide rail 29 ... Bracket 30 ... Connecting member 33 ... Guide holding member 40 ... Removable screw 43 ... Lifting bolt (sleeve lifting member)
44 ... Lock nut (second nut)
48 ... Hex nut (first nut)

Claims (3)

A molten metal holding furnace for storing molten metal, a stalk for sucking up the molten metal in the molten metal holding furnace, a sleeve having a flow path for filling the molten metal into the mold, and a platen for fixing the sleeve and fixing the mold And a stalk positioning means for positioning and holding the stalk with respect to the sleeve,
The stalk positioning means includes a main body portion slidably attached to the platen, and a stalk attached to a lower end of the main body portion so as to be rotatable in a horizontal direction with respect to the main body portion with one end side portion serving as an axis. A holding plate, a stalk receiving member that is attached to the stalk holding plate and inserts and fits the stalk, and a stalk lifting member that lifts the stalk and makes the stalk contact surface contact with a stalk contact hole formed in the sleeve. A casting machine characterized in that the contact portion of the stalk and the stalk receiving member has an arcuate shape, and the stalk is minutely movable with respect to the stalk receiving member. apparatus. An injection device for a casting machine according to claim 1,
The stalk lifting means includes a sleeve lifting member that has a threaded portion that is screwed into the main body portion, with a tip end abutting at a position opposite to the stalk across the sleeve, and the sleeve lifting member. An integrated first nut and a second nut attached to the threaded portion;
The first nut is tightened to lift the stalk attached to the main body, the tip of the stalk is brought into close contact with the stalk contact hole, and the second nut is tightened to hold the stalk in close contact with the sleeve. An injection device for a casting machine characterized by the above. An injection device for a casting machine according to claim 1 or 2,
A heater cover provided on the outer periphery of the stalk and having a heating means for heating the stalk accommodated in the stalk accommodation hole therein, and a hole smaller than the stalk accommodation hole formed in the lower end portion of the heater cover An injection device for a casting machine provided with a molten metal splash prevention cover.

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