WO2017068665A1

WO2017068665A1 - Injection casting device and melt supply method in said device

Info

Publication number: WO2017068665A1
Application number: PCT/JP2015/079702
Authority: WO
Inventors: 幸久長子; 保治長子; 康則西川
Original assignee: ティファ（タイランド）カンパニーリミテッド; 蔦機械金属株式会社
Priority date: 2015-10-21
Filing date: 2015-10-21
Publication date: 2017-04-27
Also published as: JP6383115B2; JPWO2017068665A1

Abstract

Provided is an injection casting device and a melt supply method capable of manufacturing a product having excellent strength in which molten metal is fed to an injection sleeve while generation of oxides and inclusion of air are minimized. The injection casting device is provided with a frame (2) having a movable frame (2c), an erectable drive mechanism (3), a mold (4), an injection sleeve in which a melt outlet is opened in the joining surface between a fixed mold (4a) and a movable mold (4b), an injection tip, a tip drive mechanism (7), and a ladle. Pouring of the metal melt from the ladle to the injection sleeve by way of the melt outlet is started with the injection sleeve in a low-slope angle orientation, supply is thereafter continued while the injection sleeve is raised up, and the label is rotated in synchronicity with an increase in the slope angle of the injection sleeve at a midway point of supply to accelerate supply.

Description

Injection casting apparatus and hot water supply method in the apparatus

In this invention, the molten metal supplied to the injection sleeve is injection-filled from the injection sleeve into the mold cavity and solidified to obtain a product having a desired shape. The present invention relates to an injection casting apparatus that is advantageous in terms of equipment costs and can be performed while suppressing generation of objects and air entrainment, and a hot water supply method in the apparatus.

従来 Conventional injection casting apparatuses that perform die casting are generally horizontally fixed and horizontally cast. The molten metal is supplied to the injection sleeve (also referred to as a plunger sleeve) in this horizontal casting type injection casting apparatus by the method disclosed in Patent Document 1 below, that is, a pouring port provided on the outer periphery of the rear portion of the injection sleeve. Usually, a method of pouring the molten metal into the injection sleeve is used.

Since simple air pouring from the pouring port into the injection sleeve tends to cause air entrainment or oxidation of the molten metal, the following Patent Document 2 discloses that the hot water is gently supplied to the injection sleeve. A hot water supply method that suppresses problems is proposed.

In the hot water supply method, a hopper whose lower end is inserted into the pouring port is used together, and the hot water supply port at the lower end of the hopper is arranged near the lower inner wall surface of the injection sleeve, and the supply of the molten metal is started via the hopper.

The hot water supply is continued while raising the position of the hopper so that the distance from the hot water inlet to the hot water surface in the injection sleeve is kept substantially equal to the distance from the hot water inlet at the start of hot water supply to the lower inner wall surface of the injection sleeve. To do.

In the horizontal casting type casting apparatus, as described above, a pouring port is provided on the outer periphery of the rear portion of the injection sleeve and hot water is supplied to the injection sleeve from there, but the pouring port at the tip of the injection sleeve is also used as the pouring port. A method of pouring molten metal from the gate into the injection sleeve is also known.

For example, in the vertical injection casting apparatus described in

Patent Documents

3 and 4 and the like below, a vertically arranged injection sleeve is detached from a mold when hot water is supplied, and the injection sleeve is slightly inclined to supply hot water from the tip (upper end) of the sleeve. In this apparatus, the outlet is also used as a pouring gate.

Japanese Patent Laying-Open No. 2005-21902 Japanese Patent Laid-Open No. 2005-118813 JP 2001-113355 A Japanese Patent Laid-Open No. 2006-110568

In the method of Patent Document 1 in which the molten metal is simply poured into the injection sleeve from the pouring port on the outer periphery of the rear portion of the injection sleeve, air is easily involved in the molten metal and the molten metal is easily oxidized. If air or oxide is mixed into the molten metal injected from the injection sleeve, the product becomes a defective product with insufficient strength.

Although the method of patent document 2 is proposed as a solution of the problem, since supply of the molten metal from the ladle to the hopper is performed by a method of pouring the molten metal, when the molten metal falls into the hopper, the molten metal is supplied to the molten metal. Air is entrained and the oxidation of the molten metal is also promoted.

The problem is small compared to the method of Patent Document 1, but it is a problem in securing reliability, particularly in the casting of a metal having a low kinematic viscosity, such as aluminum or an aluminum alloy, or in the formation of a product having a shape that easily generates nests. Is not preferable.

In addition, since the method of Patent Document 2 is hot water supply via a hopper, there is a concern about a decrease in the temperature of the molten metal and a decrease in the fluidity due thereto, and in casting the molten metal into a large volume cavity, the decrease in the fluidity of the molten metal is This is not preferable because it leads to an increase in injection pressure.

In addition, in the case of a horizontal casting type casting apparatus, the molten metal surface area of the molten metal in the injection sleeve when the hot water supply to the injection sleeve is completed is larger than that of the vertical injection casting apparatus, and solidified pieces (break chill) Layer) hinders the compression of the molten metal by the injection tip (plunger tip), and the compressibility of the molten metal pushed out from the injection sleeve deteriorates, and the phenomenon that air is entrained in the molten metal and fine solidified pieces are mixed into the molten metal. A situation that flows into the cavity also occurs.

On the other hand, the hot water supply in the vertical injection casting apparatus that also serves as the pouring outlet of the injection sleeve is because the area of the molten metal surface formed in the injection sleeve is significantly smaller than that of the lateral casting type casting apparatus, Solidified pieces generated in the molten metal are reduced as compared with a horizontal casting type casting apparatus.

However, this vertical injection casting apparatus has a complicated structure and high equipment costs. Further, since the supply of the molten metal to the injection sleeve becomes a drop-in supply, air entrainment due to foaming of the molten metal is likely to occur at this time.

Therefore, Patent Document 3 adopts a method in which the injection tip is raised to start hot water supply, and then the hot water supply is advanced while lowering the injection tip to reduce the fall distance of the molten metal and keep the distance constant. ing.

Further, Patent Document 4 employs a method of removing the oxide film on the melt surface in the injection sleeve, which still occurs in the method of Patent Document 3, by attaching it to an oxide film removing device installed in a ladle.

However, since the basic method of these methods is dropping hot water supply, a phenomenon occurs in which the molten metal in the initial stage of hot water supply hits the injection tip and is reversed and rolled up. Therefore, a certain amount of molten metal oxidation and air entrainment are inevitable.

An object of the present invention is to provide an injection casting apparatus and a hot water supply method capable of producing a product having excellent strength by enabling supply of molten metal to an injection sleeve while suppressing generation of oxides and air entrainment.

In order to solve the above problems, the present invention provides the following tilt type injection casting apparatus.

The injection casting apparatus includes a gantry having a movable frame that can rotate with a horizontal support shaft as a fulcrum, a undulation drive mechanism that raises the movable frame from a horizontal posture to a vertical posture or a position having an arbitrary inclination angle, A mold, an injection sleeve, and an injection tip that are assembled to the movable frame, a tip drive mechanism that advances the injection tip to push out the molten metal supplied to the injection sleeve, and the injection sleeve It is equipped with a ladle for pouring molten metal from the outlet.

The mold is composed of a fixed platen attached to the movable frame, a fixed mold that is individually supported by the movable platen, and a movable mold, and the fixed mold and the movable mold that move toward and away from each other by the movement of the movable platen. A molding cavity is created between the mold.

The tip of the injection sleeve is connected to the fixed mold, and when the movable mold is separated from the fixed mold, the hot water outlet at the tip is opened to the outside.

The tip drive mechanism is preferably composed of a link mechanism, a drive source that operates the link mechanism, and a movable block that receives power through the link mechanism to displace the injection tip.

The drive mechanism of the link mechanism is composed of a ball screw, a motor for rotating the ball screw, and a movable body screwed into the ball screw, or a hydraulic or electric cylinder actuator capable of stroke control. Etc.

The link mechanism includes first and second links arranged in parallel, one end pivotally connected to the movable body and the other end pivotally connected to the movable block, one end being in the middle of the second link, and the other end being the movable body. It is preferable that a third link pivotally connected to the gantry in front of the moving direction is provided, and the second link and the third link constitute a toggle mechanism.

Further, it is preferable that the ladle is provided with a pipe path protruding from the fuselage at the upper end edge of the fuselage, and has a hot water inlet inclined at a predetermined angle in a specific direction with respect to the horizontal upper surface of the ladle at the tip of the pipe path.

Here, the direction of inclination of the hot water supply port is the direction in which the upper end of the hot water supply port protrudes forward with respect to the lower end of the hot water supply port (this is the rotation fulcrum of the ladle and the starting point of the molten metal outflow from the ladle).

The ladle has a fixed support bar having a rotation support point of the ladle on the extension of the axial center on the base end side, and the rotation angle (tilt angle) of the ladle is changed by rotating the fixed support bar. preferable. The base end side of the fixed support rod refers to the side that is rotationally driven by the drive source.

Such an injection casting apparatus can supply hot water to the injection sleeve by the following method.
First, the movable frame of the gantry is leveled and the movable mold is separated from the fixed mold. In this state, the ladle pumped up a certain amount of molten metal enters the outlet of the injection sleeve, and the lower end of the hot water outlet Set so that is in contact with the inner surface of the injection sleeve.

Next, the movable frame is tilted with the ladle until the molten metal position of the molten metal in the ladle is higher than the lower part (bottom) of the starting end of the outflow passage from the ladle, and the molten frame in the ladle is tilted. Pour into the injection sleeve.

It can be confirmed that the melt surface position of the molten metal in the ladle is above the lower part of the starting end of the outflow path from the ladle by the molten metal starting to flow out of the ladle. Further, since the shape of the ladle, the amount of molten metal drawn by the ladle, the wall frictional force of the outflow passage, and the like are known, it is possible to detect from the inclination angle of the ladle.

At this time, the movable frame has an inclination angle (hereinafter referred to as “the molten metal supplied to the injection sleeve” in the vicinity of the lower end of the hot water outlet of the ladle and the flow rate of the molten metal in the injection sleeve is 50 cm / sec or less. The inclination angle of the injection sleeve) may be controlled.

¡The flow rate at this time can be confirmed by a method such as measuring the melt flowing out from the hot water inlet of the ladle with a non-contact type flow rate sensor attached to the ladle. A ladle described later having a pipe path can also measure the flow velocity of the molten metal flowing through the pipe path with the entrance on the body side of the pipe path as a confirmation surface.

Also, if the molten metal in the ladle does not flow out only by tilting the movable frame, the ladle is rotated a little until the molten metal surface in the ladle is above the lower part of the starting edge of the outflow path of the ladle.

When the molten metal in the ladle flows out to the injection sleeve in this manner, the movable frame is gradually raised until a hot water pool is formed in the injection sleeve where the lower half of the end face of the injection tip inserted into the injection sleeve contacts. The angle of inclination of the injection sleeve and the angle of inclination of the ladle are gradually increased.

The formation of the hot water pool in the injection sleeve means that the inclination angle of the injection sleeve, the inner diameter of the injection sleeve and the standby position of the injection tip, the supply amount per unit time of the molten metal flowing into the injection sleeve, and the supply It can be known from the time, and it is also possible to detect that the molten metal surface position has risen to the set position by inserting a sensor into the injection sleeve.

Until the hot water pool is formed, the molten metal supplied to the injection sleeve is kept near the lower end of the hot water outlet of the ladle, and the flow velocity of 50 cm / sec or less is maintained.

After this, if a hot water puddle where about half of the end face of the injection tip contacts the inside of the injection sleeve, the ladle is also rotated in synchronization with the increase in the inclination angle of the injection sleeve to increase the flow rate of the molten metal into the injection sleeve.

The hot water supply is completed when the inclination angle of the injection sleeve and the rotation angle of the ladle reach the specified values, and then the ladle is retracted, the movable mold is butted against the fixed mold, and the mold is clamped by the apparatus for injection. The molten metal in the sleeve is injected and filled into the mold cavity.

It is preferable to perform the injection filling with the gantry tilted.

In the injection casting apparatus according to the present invention, the molten metal is supplied from the ladle to the injection sleeve with the injection sleeve placed in a low inclination angle position in which the molten metal surface position in the ladle is slightly above the molten metal surface position in the injection sleeve. it can.

As a result, the flow velocity of the molten metal flowing into the injection sleeve (= the velocity flowing down in the injection sleeve) is slowed to cause a phenomenon that the molten metal in the initial stage of supply jumps or collides with the injection tip waiting in the injection sleeve. The phenomenon of rolling up can be eliminated.

¡By reducing the swell and rolling-up due to collision, the oxidation of the molten metal and the entrainment of air due to these phenomena are effectively suppressed.

In addition, by tilting the injection sleeve, the ladle hot water supply port can be brought into contact with the inner surface of the injection sleeve to supply it in a flowing manner, and foaming due to dropping of the molten metal can be eliminated.

Furthermore, since hot water is supplied while raising the injection sleeve, the remaining amount of air in the injection sleeve at the time of completion of hot water supply can be reduced (the filling rate of molten metal in the injection sleeve can be 80%. The remaining is residual air).

In addition to this, when the injection sleeve stands up, the surface area of the molten metal in the injection sleeve is reduced as compared with the horizontal casting type casting apparatus, and the amount of solidified pieces formed on the molten metal surface is reduced. Thereby, the situation where residual air and solidified pieces are caught in hot water to be injected and flow into the cavity is also suppressed.

In addition, the hot water outlet inclined at a predetermined angle in the above-mentioned direction with respect to the horizontal upper surface of the ladle, and the hot water outlet at the tip of the pipe path, the hot water outlet is submerged under the surface of the molten metal in the molten pool, In this state, the ladle is rotated with the lower end of the hot water supply port as a fulcrum, and the molten metal (no hot water) not touching the air (no oxide is generated) under the surface can be pumped to the trunk through the pipe path.

Further, the entire end face of the hot water inlet of the ladle is brought into contact with the molten metal surface in the injection sleeve at a position where the inclination angle of the injection sleeve and the rotation angle of the ladle are increased to some extent, and the molten metal supplied thereafter is supplied. It is also possible to make it flow into the hot water so as to sink into the hot water, and these synergistic effects can further enhance the effects of preventing the oxide from being mixed into the product and preventing the formation of nests caused by air entrainment.

In addition, in the situation where the entire end face of the ladle hot water outlet is immersed in the molten metal in the injection sleeve, there is no concern of impact or hot spring splash due to the falling of hot water, so the hot water supply speed (hot water flow rate) is increased. Time can also be shortened.

Considering improvement of productivity, suppression of oxidation of the molten metal supplied to the injection sleeve, and maintenance of the fluidity of the molten metal when the molten metal is injected into the cavity, the shorter the hot water supply time, the better it is possible to meet the demand by accelerating the hot water supply halfway Can do.

In addition to this, depending on the shape of the cavity, it is conceivable that the molten metal pushed out from the injection sleeve flows into the cavity from the gate.

The injection casting apparatus according to the present invention can reduce the inclination angle of the injection sleeve in such a case so that the molten metal flows into the cavity without causing any trouble.

Further, as the chip drive mechanism, a mechanism that employs the link mechanism, a drive source, and a movable block, especially a link mechanism that includes a toggle mechanism, amplifies the power of the drive source with the link mechanism. Thus, the injection tip can be driven, the mechanism can be easily simplified and miniaturized, and the position of the injection tip can be accurately controlled.

It is a side view which shows the outline | summary of the whole structure of an example of the injection casting apparatus of this invention. It is a side view which shows the state which inclined the movable frame of the injection casting apparatus of FIG. It is a perspective view which simplifies and shows an example of the stand and the undulation drive mechanism of the injection casting apparatus of this invention. It is a partially broken side view which shows the outline | summary of an injection sleeve, an injection tip, and a chip drive mechanism. It is a partially broken side view which shows the state which changed the stand-by position of the injection chip | tip from the position of FIG. It is a perspective view which shows an example of the ladle provided in the injection casting apparatus of this invention. It is a front view of the ladle of FIG. It is a side view of the ladle of FIG. It is sectional drawing of the ladle of FIG. FIG. 7 is an explanatory diagram of a procedure for drawing a molten metal using a ladle in FIG. 6. FIG. 7 is an explanatory diagram of a procedure for drawing a molten metal using a ladle in FIG. 6. FIG. 7 is an explanatory diagram of a procedure for drawing a molten metal using a ladle in FIG. 6. FIG. 7 is an explanatory diagram of a procedure for drawing a molten metal using a ladle in FIG. 6. FIG. 7 is an explanatory diagram of a procedure for drawing a molten metal using a ladle in FIG. 6. It is sectional drawing for description which shows the state which set the ladle which scooped up the molten metal in the pouring gate used also as the tap of the injection sleeve. It is sectional drawing for description which shows the state which inclined the injection sleeve 5 degrees with the ladle. It is sectional drawing for description which shows the state of the injection sleeve inclination | tilt angle of 10 degrees and the ladle rotation angle of 0 degrees. It is sectional drawing for description which shows the state of the injection sleeve inclination | tilt angle of 15 degrees and the ladle rotation angle of 10 degrees. It is sectional drawing for description which shows the state of the injection sleeve inclination | tilt angle of 25 degrees and the ladle rotation angle of 16 degrees. It is sectional drawing for description which shows the hot water supply completion state of the injection sleeve inclination | tilt angle of 45 degrees and the ladle rotation angle of 20 degrees. It is sectional drawing for description which shows the state which faced the fixed metal mold | die and the movable metal mold | die, performed mold clamping, and started injection of the molten metal from an injection sleeve. It is explanatory drawing of the state which flows in so that a molten metal may fall with respect to a cavity. It is a perspective view which shows the external appearance shape of the adapter prototyped for the strength evaluation test. It is a side view which shows the outline | summary of the other example of a chip drive mechanism. It is a side view which shows the state which changed the stand-by position of the injection chip | tip from the position of FIG.

Hereinafter, modes for carrying out the present invention will be described with reference to the accompanying drawings. An injection casting apparatus 1 shown in FIGS. 1 and 2 includes a gantry 2, an undulating drive mechanism 3 (see FIG. 3 at the same time), a mold 4, an injection sleeve 5 and an injection tip 6 shown in detail in FIGS. The chip driving mechanism 7 and the ladle 8 shown in FIGS. 6 to 9 are combined.

As shown in FIG. 3, the gantry 2 is configured by combining a base portion 2 a whose position is fixed and a movable frame 2 c that moves using a horizontal support shaft 2 b supported by the base portion as a rotation fulcrum. ing.

The movable frame 2c of the illustrated apparatus can undulate between a horizontal posture with an inclination angle of 0 ° and an inclination angle of 45 °. A fixed platen 4f and a movable platen 4g are assembled to the movable frame 2c.

The undulation drive mechanism 3 shown in FIGS. 1 to 3 is a cylinder actuator (trunnion hydraulic cylinder) 3a, which is attached to the base portion 2a with a variable inclination angle.

As shown in FIGS. 1 and 2, the output rod Or of the cylinder actuator is connected to the rear side of the support point by the horizontal support shaft 2b of the movable frame 2c. By driving the cylinder actuator 3a, the movable frame 2c of the illustrated injection casting apparatus rises to a position where the maximum inclination angle is 45 °.

The movable frame 2c is a undulating drive mechanism having a structure different from that of the illustrated undulating drive mechanism 3. For example, the movable frame 2c is fixed to the movable frame 2c using the horizontal support shaft 2b as a rotation axis, and the shaft is combined with a gear and a servo motor. It is also possible to stand up to an inclination angle of 90 ° by rotating with the above mechanism.

The mold 4 includes a fixed mold 4a supported by the fixed platen 4f on the movable frame and a movable mold 4b supported by the movable platen 4g (see FIGS. 1 and 2). A cavity 9 (see FIGS. 17 and 18) serving as a molding space for the product is created between the fixed mold 4a and the movable mold 4b that are brought into contact with and separated from each other by the movement of the movable platen 4g.

As shown in FIG. 17, the mold 4 includes a runner 4 c extending from the upper end of the outlet 5 a of the injection sleeve 5 to the cavity 9, and a gas vent (such as a chill vent or an air) communicating with the runner 4 c via the cavity 9. Vent) 4d is provided. 4e is a gate (gate) of the

cavity

9, and 4h is an extrusion pin.

The molten metal in the injection sleeve 5 is pushed by the injection tip 6 and flows in the order of the tap 5a, the tap 4c and the tap 4e in the mold, and is introduced into the cavity 9.

The degassing part 4d is a normally open passage, and air remaining in the injection sleeve at the start of injection is discharged out of the machine through the degassing part 4d.

The tip of the injection sleeve 5 is connected to the fixed mold 4a (see FIGS. 11 to 18). As shown in FIG. 11, the tap 5 a at the tip of the injection sleeve 5 has a mating surface with the movable mold 4 b of the fixed mold 4 a when the movable mold 4 b is separated from the fixed mold 4 a ( It is open to the parting surface and the mold-sliding surface.

The tip of the injection tip 6 is inserted into the injection sleeve 5.

The chip drive mechanism 7 is shown in detail in FIGS. 4 and 5, that is, a link mechanism 7a, a drive source 7b for operating the link mechanism, and the injection chip 6 displaced by receiving power through the link mechanism 7a. A combination of movable blocks 7c is provided.

The link mechanism 7a includes a first link 7a-1 and a second link 7a-2 arranged in parallel, one end of which is pivotally coupled to a movable body 7b-3 as a drive source and the other end of which is coupled to a movable block 7c. The second link 7a-2 includes a third link 7a-3 pivotally coupled to the movable frame 2c at the other end of the second link 7a-2 in the moving direction of the movable body 7b-3. The three links 7a-3 constitute a toggle mechanism.

In FIG. 4, Pa is a connecting shaft obtained by connecting the second link 7a-2 to the movable body 7b-3, Pb is a connecting shaft obtained by connecting the third link 7a-3 to the second link 7a-2, and Pc. Is a connecting shaft in which the second link 7a-2 is coupled to the movable block 7c.

Pd is a connecting shaft that connects the third link 7a-3 to the movable frame 2c, Pe is a connecting shaft that connects the first link 7a-1 to the movable body 7b-3, and Pf is the first link. This is a connecting shaft in which 7a-1 is coupled to the movable block 7c.

The center of the connection axis Pd is at the midpoint of the axis C2 connecting the centers of the connection axes Pa and Pc. An axis C4 connecting the centers of the connecting shafts Pc and Pd is parallel to the axis C1 of the injection sleeve 5.

The axis C3 is perpendicular to the axis C1 of the injection sleeve 5. Further, the axis of the motor 7b-2 and the ball screw 7b-1 and the axis of the output rod of the cylinder actuator 7b-4 described later are parallel to an axis C3 connecting the centers of the connecting axes Pa and Pc. Furthermore, the axis C5 connecting the centers of the connecting axes Pe and Pa and the axis C6 connecting the centers of the connecting axes Pf and Pc are parallel.

4 and 5 includes a ball screw 7b-1, a motor 7b-2 capable of rotation control for rotating the ball screw, and a movable body 7b- screwed to the ball screw. However, the drive source 7b may use a cylinder actuator 7b-4 as shown in FIGS. 20 and 21 that can perform stroke control.

As the cylinder actuator 7b-4, a hydraulic cylinder is preferable because a large output can be obtained, but an electric cylinder can also be used.

4 and 5, when the ball screw 7b-1 is rotationally driven, the movable body 7b-3 is displaced, and the displacement force is amplified by the link mechanism 7a and transmitted to the movable block 7c. The injection chip 6 connected to the movable block 7c is pushed and pulled.

The injection tip 6 pushed by the movable block 7 c advances in the injection sleeve 5 and injects the molten metal supplied to the injection sleeve 5 toward the cavity 9.

The standby position of the injection tip 6 in the injection sleeve 5 is adjusted according to the volume of the cavity 9. FIG. 5 shows a state where the injection tip 6 is changed from the position of FIG. Adjustment (fluctuation) of the standby position is also performed by driving the injection tip 6 with the tip drive mechanism 7.

When changing the standby position of the injection tip 6 corresponding to the cavity volume fluctuation, the position of the hot water surface in the injection sleeve is always near the tip of the injection sleeve when the hot water supply is completed, and the hot water does not spill. To be done. Thereby, the molten metal filling rate of the injection sleeve can be increased.

The ladle 8 is provided with a devised shape. The ladle 8 shown in FIGS. 6 to 9 includes a pipe path 8b parallel to the upper surface of the ladle at the periphery of the cup-shaped body 8a having an upper end opening, and a specific direction with respect to the horizontal upper surface of the ladle at the tip of the pipe path 8b. Is provided with a hot water supply port 8c inclined at a predetermined angle. 8d is a bracket provided so as to protrude to the outside of the

body

8a, and 8e is a spill prevention wall for preventing the molten metal in the body 8a from spilling outside when the ladle 8 is tilted to the maximum.

As shown in FIG. 9, the hot water supply port 8c is inclined in a direction in which the upper end T of the hot water supply port protrudes forward with respect to the lower end Le of the hot water supply port. The illustrated ladle 8 is set to an angle θ1 = 60 ° in FIG. 9 (which is preferably 55 ° to 60 °) and an angle θ2 = 5 °, so that the inclination angle of the hot water supply port 8c with respect to the upper surface of the ladle is set. θ3 is 65 °.

Further, the illustrated ladle 8 is a ladle for an injection casting apparatus in which the inclination angle θ4 of the peripheral wall of the body 8a is set to 60 ° or less with respect to the horizontal upper surface of the ladle and the injection sleeve is inclined at an inclination angle of 45 ° when hot water supply is completed. The maximum rotation angle is set to 20 °.
In the illustrated ladle 8, when the lower inner surface of the peripheral wall of the body 8a is horizontal, there is an upper end of the spill prevention wall 8e above the inner surface in the horizontal state, and the prevention wall 8e functions as a kind of weir. .

The length of the pipe path 8b from the end on the body side to the rotation support point of the ladle (the lower end Le of the hot water supply port) is preferably 20 mm or more. The longer the length, the deeper the hot water inlet 8c at the tip of the pipe path can be submerged by the molten metal in the pool when the ladle 8 draws the molten metal in the pool.

The maximum length of the pipe path 8b is set to a length that does not hinder the ladle rotation when the molten metal is supplied from the ladle to the injection sleeve.

The illustrated ladle 8 has a fixed support rod 10 (see FIGS. 6 and 7). The fixed support rod 10 has a front end portion 10a (which is parallel to the rear end portion 10f) protruding from a bracket 8d provided so as to protrude from the rear portion of the ladle body 8a (the side having the hot water supply port is considered to be the front portion). It is connected.

The fixed support rod 10 has an upward bent portion 10b, an intermediate portion 10c extending rearward, a forward bent portion 10d, and a downward bent portion 10e for height adjustment in order from the front end side to the rear end portion 10. The lower end Le of the hot water outlet 8c of the ladle is formed on the extension of the axial center of the rear end portion 10f.

A ladle rotation drive source (not shown; the articulated robot is also considered as one of the rotation drive sources) of the hot water supply device is connected to the rear end portion 10f of the fixed support rod 10, and this rear end portion 10f (that is, hot water supply) The ladle 8 is rotated with the lower end Le) of the mouth as a fulcrum.

By providing the fixed support rod 10 having such a shape, the molten metal in the pool is made into the ladle 8 with the lower end Le of the hot water supply port 8c as the rotation fulcrum of the ladle while avoiding the interference of the fixed support rod with the peripheral wall of the molten metal pool. Can be pumped up.

Next, the operation of pumping the molten metal Mm from the molten metal pool using the illustrated ladle will be described. As shown in FIG. 10A, the ladle 8 is lowered in a state of being rotated by 90 ° from the horizontal posture, and the hot water supply port 8c of the ladle is submerged in the molten metal Mm in the molten metal pool 11 as shown in the drawing.

At this time, it is preferable that the sinking amount of the hot water supply port 8c with respect to the molten metal Mm is 20 mm or more. If the sinking amount is large, it is easy to maintain the sinking state of the hot water supply port 8c with respect to the molten metal Mm when the molten metal is pumped through the pipe path 8b.

Thereafter, while rotating the ladle 8 by applying a rotational force to the fixed support rod 8d (the ladle 8 is rotated until the lower end of the body side end of the pipe path 8b of the ladle is below the level of the molten metal in the pool. The position is further lowered (see FIGS. 10B and 10C).

By this operation, the molten metal Mm flows into the ladle body 8a from the hot water supply port 8b. At this time, the flow rate of the molten metal Mm into the ladle body is preferably controlled to 50 cm / sec or less.

The inflow speed can be reduced to 50 cm / sec or less by appropriately designing the cross-sectional areas of the pipe path 8b and the hot water supply port 8c and controlling the attitude and rotation speed of the ladle during pumping.

The molten metal Mm pumped to the ladle 8 by this method is only the hot water below the surface of the bath where no oxide is generated, and this also suppresses the mixing of the oxide into the product.

FIG. 10D shows a state where the molten metal is pumped in a certain amount with respect to the ladle 8. The amount of pumping at this time can be adjusted by controlling the final rotational posture and the descending amount of the ladle 8.

After that, the ladle 8 that has drawn the molten metal is returned to a horizontal posture, and is moved between the fixed mold 4a and the movable mold 4b of the injection casting apparatus 1 and set at a predetermined position for hot water supply as shown in FIG.

At this time, the injection sleeve 5 and the ladle 8 are both in a horizontal posture, and the lower end Le of the hot water outlet 8c of the ladle contacts the inner surface of the injection sleeve 5 in the vicinity of the open hot water outlet 5a of the injection sleeve 5. In addition, all the inclination angles said below are angles with respect to a horizontal plane.

When the setting is completed, the movable frame 2c of the gantry (see FIGS. 1 to 3) is tilted several degrees with the relative position to the ladle 8 fixed (with the ladle 8 left in the set state).

At this time, the inclination angle of the injection sleeve (= the inclination angle of the movable frame) may be about 5 °, for example. Due to this inclination, as shown in FIG. 12, the molten metal position of the molten metal Mm in the ladle is slightly higher than the lower surface of the starting end of the pipe path 8c, and the molten metal in the ladle is discharged from the lower end Le of the hot water inlet to the injection sleeve 5. Flows out.

In the state where the inclination angle of the injection sleeve 5 is small and the molten metal surface position of the molten metal Mm in the ladle 8 is slightly higher than the molten metal surface position of the molten metal in the injection sleeve 5, the molten metal surface supplied to the injection sleeve is ladle. The molten metal supplied from the ladle 8 while being maintained near the lower end of the hot water supply port 8 c flows into the injection sleeve 5 at a low speed.

Although the inclination angle of the injection sleeve 5 at the initial stage of hot water supply is not limited to 5 °, the molten metal in the ladle can flow out toward the injection sleeve 5 at an inclination angle of that degree.

At this time, if the molten metal in the ladle does not flow out only by the inclination of the movable frame of the gantry, the ladle 8 is also rotated slightly until the molten metal surface position in the ladle 8 is above the lower end of the root of the pipe path 8b.

The initial flow rate of the molten metal to the injection sleeve may be controlled to 50 cm / sec or less.

This is because when the flow velocity exceeds 50 cm / sec, the molten aluminum or aluminum alloy having a small kinematic viscosity coefficient causes a swell that the tip (the tip of the outflow) jumps, and further jumps by colliding with the injection tip, The air in the injection sleeve is caught in hot water.

On the other hand, if the flow rate is 50 cm / sec or less, the above-described swells and jumps are prevented even for molten aluminum or aluminum alloy. This can also be confirmed by computer simulation analysis. The optimum value of the flow velocity is determined based on the casting result by the prototype device (actual machine).

Since the kinematic viscosity coefficient of aluminum or aluminum alloy is smaller than that of a molten metal of copper, cast iron, or steel, a flow rate of 50 cm / sec or less is a speed that can also be applied to hot water supplies of copper, cast iron, steel, and the like.

When the molten metal that has flowed into the injection sleeve 5 reaches the injection tip 6, the inclination angle of the gantry 2 (inclination angle of the injection sleeve) is gradually increased (see FIG. 13) and synchronized with the increase of the inclination angle of the injection sleeve 5 from the middle. Then, the ladle 8 is also rotated (see FIG. 14).

While the molten metal surface rises to the vicinity of the radial center of the injection tip, the molten metal inflow speed of 50 cm / sec or less is maintained by gently changing the inclination angle of the injection sleeve and the rotation angle of the ladle.

In the hot water supply using the illustrated ladle 8, if the inclination angle of the injection sleeve and the rotation angle of the ladle suddenly increase at the initial stage of the hot water supply and the inflow rate of the molten metal into the injection sleeve 5 exceeds 50 cm / sec, the spilling occurs. Even if the prevention wall 8e is provided, depending on the size of the spill prevention wall 8e, the molten metal in the ladle may be spilled outside without passing through the pipe path. The flow rate is preferably 50 cm / sec or less.

As the hot water supply advances in this way, the hot water level in the injection sleeve 5 rises, and a hot water pool in which the lower half of the end face of the injection tip 6 contacts is formed in the injection sleeve 5.

When the hot water pool is in a state, even if the molten metal inflow speed to the injection sleeve 5 is increased, the surface of the molten metal does not swell. Therefore, the inflow speed is gradually increased by increasing the inclination angle of the injection sleeve and the rotation angle of the ladle.

When the molten metal is supplied to the injection sleeve and the rotation angle of the ladle is increased, the ladle 8 having the pipe path 8b has the entire surface of the end surface of the hot water inlet 8c of the molten metal supplied to the injection sleeve 5. It contacts the molten metal surface (see FIG. 15). This situation can be known from the inclination angle of the injection sleeve 5, the rotation angle of the ladle 8, and the amount of molten metal supplied to the injection sleeve 5.

In this situation, the molten metal supplied thereafter flows into the injection sleeve so as to sink into the supplied molten metal.

In that situation, there will be no falling or jumping of hot water. Therefore, the hot water supply speed (hot water flow rate) is increased, and the hot water supply is completed at a position where the inclination angle of the injection sleeve 5 and the rotation angle of the ladle 8 reach the set values (see FIG. 16).
The inclination angle of the injection sleeve 5 and the rotation angle of the ladle 8 are set in a range in which the angle obtained by adding them does not exceed 90 °.

A ladle 8 having an injection sleeve 5 having an inner diameter of 80 mm and a fixed support rod 10 shown in FIGS. 6 to 9 (pipe path length from the inlet to the rotation fulcrum of the ladle = 20 mm, inclination angle of the hot water inlet with respect to the upper surface of the ladle = 65 °), an aluminum alloy die cast product having a total casting mass of 2 kg was subjected to a forming test.

The injection tip 6 is put on standby at a position retracted 230 mm from the outlet 5a of the injection sleeve 5 which is flush with the mating surface of the fixed mold 4a and the movable mold 4b, and when the injection sleeve inclination angle α = 45 °. Hot water supply was performed with the position where the filling rate of the molten metal with respect to the injection sleeve was 75% (this was a position retracted 20 mm from the outlet of the injection sleeve) at the hot water surface position when the hot water supply was completed. Under this condition, the injection sleeve maximum hot water supply mass is 2.27 kg.

As shown in FIG. 11, the hot water supply in this test is such that the lower end Le (the ladle rotation fulcrum) of the hot water outlet of the ladle 8 from which a fixed amount of molten metal has been drawn from the molten metal pool with respect to the injection sleeve 5 in a horizontal posture, Were in contact with each other horizontally.

The contact of the lower end Le of the ladle hot water inlet with the injection sleeve 5 at this time was the inner surface of the injection sleeve at a position retracted 20 mm from the hot water outlet 5a of the injection sleeve to prevent the hot water from spilling.

Thereafter, as shown in FIG. 12, the relative position of the injection sleeve 5 and the ladle 8 was fixed, and the movable frame of the gantry was inclined by 5 ° (injection sleeve inclination angle α = 5 °, and the ladle rotation angle at this time was 0 ° ). By this operation, the molten metal in the ladle 8 began to flow with respect to the injection sleeve 5. The measured value of the flow rate of the molten metal at this time was 20 cm / sec.

Next, the inclination angle of the injection sleeve 5 and the inclination angle of the ladle were increased while maintaining the state in which the molten metal Mm supplied to the injection sleeve 5 was near the lower end of the hot water inlet 8c of the ladle 8.

As a result, the hot water supply proceeds, and in the prototype casting apparatus, the injection sleeve has an injection sleeve inclination angle α = 10 ° (a ladle rotation angle of 0 ° (the state shown in FIG. 13)) and a hot water reservoir that contacts the lower half of the end face of the injection tip. 5 formed.

Therefore, the ladle was rotated in synchronization with the increase in the inclination angle of the injection sleeve. As a result, when the injection sleeve inclination angle α = 15 ° and the ladle rotation angle β = 10 ° (state of FIG. 14), the flow rate of the molten metal into the injection sleeve 5 becomes 30 cm / sec. No swells or jumps involving stagnation were found.

In this embodiment, thereafter, the ladle rotation angle β is increased by 1 ° every time the injection sleeve inclination angle α increases by 5 °. Further, in the ladle 8 of the prototype injection casting apparatus, the entire end face of the hot water supply port 8c is supplied to the injection sleeve 5 when the injection sleeve inclination angle α = 25 ° and the ladle rotation angle β = 16 ° (state of FIG. 15). The hot water supply port 8 c comes into contact with the molten metal surface of the molten metal Mm soaked in the hot water in the injection sleeve 5.

It is designed as such, and from that time, the inclining angle α of the injection sleeve 5 and the rotation angle β of the ladle 8 are further increased in synchronization to increase the flow rate of the molten metal Mm into the injection sleeve 5 to 50 cm / sec. There was no problem.

This is because the molten metal supplied thereafter flows into the injection sleeve in such a manner as to sink into the molten molten metal that has already been supplied, and no hot water falls or jumps.

The prototype injection casting apparatus completed the hot water supply from the ladle 8 to the injection sleeve 5 when the injection sleeve inclination angle α = 45 ° and the ladle rotation angle β = 20 ° (state of FIG. 16).

After the hot water supply is completed, the dollar 8 is evacuated to the outside of the movable frame 2c. After that, as shown in FIG. 17, the movable mold 4b moves from the initial position where the injection sleeve 5 keeps the inclined posture when the hot water supply is completed, and is abutted against the fixed mold 4a. The mold is clamped by a machine.

Then, after this, the injection tip 6 is driven, and injection filling of the molten metal into the cavity 9 is performed.

The injection filling of the molten metal into the cavity is performed under the condition that the injection sleeve 5 maintains the inclined posture when the molten metal supply is completed.

As a result, the air remaining in the injection sleeve 5 is pushed and moved by the molten metal, and flows in the order of the hot water outlet 5, the runner 4 c and the cavity 9 prior to the molten metal, and is discharged from the degassing part 4 d to the outside of the mold. Can do.

Further, since the injection sleeve 5 is inclined, the number of solidified pieces formed on the molten metal surface in the injection sleeve is less than that of the horizontal casting type casting apparatus, and the possibility that the solidified pieces entrap residual air in the molten metal was broken. The possibility that the solidified pieces mix with the molten metal and flow into the cavity is reduced.

Immediately after the injection and filling of the molten metal into the cavity 9, the movable frame 2c of the gantry is returned to the horizontal posture within the supplied molten metal solidification time, and the mold is opened and molded after the molten metal in the cavity 9 is cooled and solidified. Take out the product.

Note that, depending on the shape of the cavity 9, as shown in FIG. 18, it is conceivable that the molten metal pushed out from the injection sleeve flows into the cavity 9 from the gate 4 e. In such a case, the injection sleeve is tilted from the hot water supply end position to reduce the inclination angle of the injection sleeve.

Accordingly, for example, the inclination angle γ with respect to the horizontal plane of the depressed portion of the cavity 9 in FIG. 18 can be set to 0 ° or an angle close to 0 ° to prevent the molten metal Mm from dropping from the gate 4e.

Evaluation test 1

The results of an evaluation test of the prototype injection casting apparatus are shown below.
In the evaluation test, a molten aluminum alloy pumped by a conventional ladle without a pipe path was supplied to the injection sleeve by the method of the present invention. The conditions described in the examples were applied to the inclination angle of the injection sleeve when the molten metal was supplied and the flow rate of the molten metal into the injection sleeve (the same applies to the following evaluation tests).

That is, the inclination angle of the injection sleeve when the molten metal starts to flow from the ladle into the injection sleeve was set to 5 °, and the flow rate of the molten metal to the injection sleeve was set to 20 cm / sec.

When the injection sleeve rises at an inclination angle = 10 ° (the flow velocity at this stage is still 20 cm / sec), the ladle is also rotated to accelerate the inflow, and the injection sleeve inclination angle α = 45 ° and the ladle rotation angle β = 20. The hot water supply from the ladle 8 to the injection sleeve 5 was completed at °.

Thereafter, the inclined posture at the time of completion of hot water supply was maintained, and injection filling of the molten metal from the injection sleeve to the cavity was performed, and an adapter with a mounting foot was cast. The amount of gas per 100 g (inclusion gas amount) of the obtained products (2 pieces, sample 1: total weight 778.3 g, sample 2: total weight 775.4 g) was measured by a gas amount measuring device (manufactured by Kyoritsu Co., Ltd.) GV700).
The gas amount measuring device GV700 described here is manufactured by the office Kobe Giken Co., Ltd., which requested the measurement, as a special order from Kyoritsu Co., Ltd., and is not a commercial product.

For comparison, a gas per 100 g of a heat sink vacuum cast product (sample A: total weight 962.4 g, sample B: total weight 966.7 g) made of an aluminum alloy cast using a conventional vertical die casting machine. The amount was also measured using the gas amount measuring device.

As a result, the gas amount of the heat sink vacuum casting was 10.0 cm 3/100 g for sample A and 5.9 cm 3/100 g for sample B.

On the other hand, the product supplied with hot water by the method of the present invention using the apparatus of the present invention is 1.1 cm 3/100 g for sample 1 and 2.2 cm 3/100 g for sample 2 even though it is not a vacuum cast product. Therefore, the amount of gas included was much smaller than that of the conventional method.

Evaluation test 2

Using the prototype injection casting apparatus provided with the aforementioned ladle having a pipe path, the molten metal was supplied to the injection sleeve by the method of the present invention from the ladle that had been subjected to quantitative pumping via the pipe path. Also in this test, the molten metal began to be supplied from the ladle at an injection sleeve inclination angle of 5 ° and an inflow rate of molten metal to the injection sleeve of 20 cm / sec.

Next, the ladle is rotated from the position where the injection sleeve inclination angle α = 10 °, and the inflow speed at the injection sleeve inclination angle α = 15 ° and the ladle rotation angle β = 10 ° is accelerated to 30 cm / sec. The hot water supply from the ladle 8 to the injection sleeve 5 was completed at the inclination angle α = 45 ° and the ladle rotation angle β = 20 °.

After this, while maintaining the inclined posture when the hot water supply was completed, the molten metal was injected from the injection sleeve into the cavity, and an adapter with a mounting foot was cast. Then, the amount of gas per 100 g weight was measured for the obtained products (two pieces, sample 1: total weight 767.6 g, sample 2: total weight 753.5 g).

For comparison, an aluminum alloy gear case (sample A: total weight 1633.9 g, sample B: total weight 1630.5 g, sample C) cast using a conventional vertical die casting machine (manufactured by Ube Industries) : 3 pieces having a total weight of 1626.6 g), the gas amount per 100 g of the weight was also measured.

As a result, the gear case cast by the conventional method was 5.5 cm3 / 100 g for sample A, 7.8 cm3 / 100 g for sample B, and 6.0 cm3 / 100 g for sample C.

On the other hand, the adapter which performed hot water supply by the method of the present invention using the apparatus provided with the ladle with the pipe route of the present invention has a sample 1 of 0.9 cm3 / 100 g and a sample 2 of 0.8 cm3 / 100 g. Compared with the conventional method, the amount of inclusion gas was much smaller. Moreover, the amount of inclusion gas was further reduced from the amount of inclusion gas in evaluation test No. 1 using a conventional ladle without a pipe path.

Evaluation test 3

The strength of the mounting seat B having the bolt hole of the foot of the adapter A (see FIG. 19) manufactured by the evaluation test method 2 was measured. The strength was evaluated based on the load when the mounting seat B was folded off from the lower end of the standing wall of the foot having a 90 ° crossing angle.

As a result, the strength of the two adapters cast using the conventional vertical die casting machine was 28.9 kN and 30.5 kN, whereas hot water was supplied by the method of the present invention and the apparatus of the present invention. The strength of the adapter 3 casted at 34.0 kN, 34.8 kN, and 35.0 kN was about 15% higher than that of the conventional method.

From these evaluation test results, the effectiveness of the injection casting apparatus and the hot water supply method of the present invention can be confirmed.

The injection casting apparatus of the present invention can be cast using the hot water supply method of the present invention in combination with the above-described injection sleeve 5 by installing a conventional lateral casting type die casting machine on the movable frame 2c. High quality products can be cast.

In addition, the above-described injection sleeve 5 is added to an existing gravity casting mold or low-pressure casting mold, and injection casting is possible by installing the mold on the fixed platen 4f and the movable platen 4g of the apparatus of the present invention. is there.

DESCRIPTION OF SYMBOLS 1 Injection casting apparatus 2 Base 2a Base part 2b Horizontal support shaft 2c Movable frame 3 Elevating drive mechanism 3a Cylinder actuator Or Output rod 4 Die 4a Fixed mold 4b Movable mold 4c Runway 4d Gas vent 4e Tap 4f Fixed platen 4g Movable platen 4h Extrusion pin 5 Injection sleeve 5a Outlet 6 Injection tip 7 Tip drive mechanism 7a Link mechanism 7a-1 First link 7a-2 Second link 7a-3 Third link 7b Drive source 7b-1 Ball screw 7b-2 Motor 7b-3 Movable body 7b-4 Cylinder actuator 7c Movable block Pa Connecting shaft Pb connecting the second link to the movable body Connecting shaft Pc connecting the third link to the second link Connecting the second link to the movable block Connected shaft P d Connecting shaft Pe connecting the third link to the movable frame Connecting shaft Pf connecting the first link to the movable body Connecting shaft C1 connecting the first link to the movable block C1 The axes C2 Pa and Pc of the injection sleeve Axis line C3 Axis line C4 connecting Pa and Pb Axis line C4 connecting Pc and Pb C5 Axis line connecting Pe and Pa C6 Axis line connecting Pf and Pc 8 Ladle 8a Body 8b Pipe path 8c Hot water inlet 8d Bracket 8e Spill prevention wall Le Hot water outlet Lower end T Upper end of hot water supply port 9 Cavity 10 Fixed support rod 10a Front end portion 10b Upward bent portion 10c Intermediate portion 10d Forward bent portion 10e Downward bent portion 10f Rear end portion 11 Molten pool A Adapter G Mounting seat α Injection sleeve inclination angle β Ladle rotation Angle θ1 Water at the bend of the pipe path Inclination angle with respect to the tilt angle γ horizontal plane of the cavity of the barrel wall against inclination angle θ4 ladle upper surface of the hot water port for the inclination angle θ3 ladle upper surface of the hot water port for the bending angle θ2 pipe path bent portion relative to the surface

Claims

A gantry (2) having a movable frame (2c) rotatable about a horizontal support shaft, and a hoisting drive mechanism (3) for raising the movable frame (2c) from a horizontal posture to a position having an arbitrary inclination angle. And a mold (4), an injection sleeve (5) and an injection tip (6) each supported by the movable frame (2c), and the injection tip (6) is advanced and supplied to the injection sleeve (5). A chip drive mechanism (7) for extruding the molten metal, and a ladle (8) for pouring the molten metal from the outlet (5a) of the injection sleeve to the injection sleeve (5),
The mold (4) is composed of a fixed mold (4a) and a movable mold (4b) that creates a cavity (9) between the fixed mold and the fixed mold.
The injection sleeve (5) has a distal end connected to the fixed mold (4a), and the hot water outlet (5a) is opened to the outside when the movable mold (4b) is separated from the fixed mold. Is,
A molten metal made from the ladle (8) to the injection sleeve (5) with the hot water supply port (8c) in contact with the inner surface of the discharge port of the injection sleeve under the condition that the injection sleeve (5) is in a low inclination angle posture. (Mm) pouring started,
In the first half of the hot water supply, that is, until the hot water pool in which the molten metal flowed into the injection sleeve (5) contacts the lower half of the end face of the injection tip (6) is formed in the injection sleeve (5) (8) The situation where the hot water surface position in the injection sleeve (5) is slightly higher than the hot water surface position in the injection sleeve (5) is maintained, and the inclination angle of the injection sleeve (5) gradually increases, passing the first half of the hot water supply. The ladle (8) rotates in synchronism with the increase in the inclination angle of the injection sleeve (5) and the hot water supply is accelerated, so that the hot water supply is completed at a position where the injection sleeve (5) assumes a predetermined inclined posture. Configured injection casting equipment.
The injection casting apparatus according to claim 1, wherein the inclination angle control of the injection sleeve (5) in the first stage of hot water supply is performed so that the flow rate of the molten metal flowing into the injection sleeve (5) is 50 cm / sec or less.
As the ladle (8), a pipe path (8b) protruding from the fuselage is provided at the upper end edge of the fuselage (8a), and the upper side of the pipe path (8b) protrudes forward from the upper surface of the horizontal ladle. A fixed support rod (10) having a hot water supply port (8c) inclined at a predetermined angle to the upper end and further having a lower end (Le) of the hot water supply port serving as a rotation fulcrum of the ladle on the extension of the axial center on the base end side The injection casting apparatus according to claim 1, further comprising: a rotating support rod (10) that changes a ladle rotation angle.
The injection so that the hot water supply speed after the entire area of the hot water supply port (8c) at the tip of the pipe path (8b) is in contact with the surface of the molten metal in the injection sleeve (5) is faster than the hot water supply speed until then. The injection casting apparatus according to claim 3, wherein the inclination angle of the sleeve (5) and the rotation angle of the ladle (8) are controlled.
The injection sleeve according to any one of claims 1 to 4, wherein the injection sleeve (5) is configured so that the molten metal in the injection sleeve (5) is injected into the cavity (9) while maintaining an inclined posture when the hot water supply is completed. The injection casting apparatus described in 1.
The chip drive mechanism (7) amplifies the power from the drive source (7b), the movable block (7c) for displacing the injection chip (6), and the drive source (7b), and the movable block (7c) The injection casting apparatus according to any one of claims 1 to 5, comprising a link mechanism (7a) including a toggle mechanism for transmitting to the inside.
The drive source (7b) is a combination of a ball screw (7b-1), a motor (7b-2) for rotating the ball screw, and a movable body (7b-3) screwed into the ball screw. The injection casting apparatus according to any one of claims 1 to 5, which is a hydraulic or electric cylinder actuator (7b-4) capable of stroke control.
A method for supplying molten metal to an injection sleeve (5) of an injection casting apparatus according to any one of claims 1 to 7, wherein the injection sleeve (5) is placed in a horizontal position and the outlet of the injection sleeve (5). The hot water supply port (8c) of the ladle (8) from which a fixed amount of molten metal has been drawn is brought into contact with the inner surface of (5a), and the molten metal surface position in the ladle (8) in this state is the hot water surface in the injection sleeve (5). The injection sleeve (5) is tilted with a ladle (8) until it is slightly above the position to start pouring the molten metal (Mm) into the injection sleeve (5),
In the first half of the hot water supply, that is, until the hot water pool in which the molten metal flowed into the injection sleeve (5) contacts the lower half of the end face of the injection tip (6) is formed in the injection sleeve (5) (8) Increasing the inclination angle of the injection sleeve (5) gradually while maintaining the situation where the hot water surface position in the injection sleeve (5) is slightly above the hot water surface position in the injection sleeve (5),
After passing the first half of the hot water supply, the ladle (8) is rotated in synchronization with an increase in the inclination angle of the injection sleeve (5) to accelerate the hot water supply, and the hot water supply is at a position where the injection sleeve (5) is in a predetermined inclined posture. A hot water supply method in an injection casting apparatus.
The hot water supply method in the injection casting apparatus according to claim 8, wherein the flow rate of the molten metal flowing into the injection sleeve (5) in the first half of the hot water supply is 50 cm / sec or less.
The ladle (8) according to claim 3 is used, and the entire area of the hot water supply port (8c) at the tip of the pipe path (8b) of the ladle is in contact with the molten metal surface in the injection sleeve (5). The hot water supply method in the injection casting apparatus according to claim 8 or 9, wherein the hot water supply speed is made faster than the hot water supply speed until then.
The molten metal is drawn into the ladle (8) by sinking the hot water inlet (8c) of the ladle under the surface of the molten metal in the molten metal pool (11), and in this state with the lower end of the hot water inlet (8c) as a fulcrum ( The hot water supply method in an injection casting apparatus according to claim 10, wherein the method is carried out by rotating 8) and causing the molten metal below the molten metal surface to flow into the ladle body (8a) through the pipe path (8b).
The hot water supply method in an injection casting apparatus according to claim 11, wherein the flow rate of the molten metal flowing into the body (8a) of the ladle through the pipe path (8b) is controlled to 50 cm / sec or less.