JPH06106324A - Method and device for eliminating oxide film of molten metal in vertical die casting machine - Google Patents

Abstract

PURPOSE:To obtain a high quality casting product by pushing out only an oxide film generated on the upper face of a molten metal to the upper part than a casting sleeve, and moving a mold opening/closing unit, and eliminating the oxide film at the time when an oxide film cutting member passes on the casting sleeve. CONSTITUTION:The upper face of a casting sleeve 14 being in a vertical state is held in advance in the vicinity of the horizontal moving locus surface of the lower face of a mold opening/closing unit 26. A casting plunger is allowed to ascend and the upper face of a molten metal in the casting sleeve 14 is allowed to ascend to the upper face of the casting sleeve. Only an oxide film produced on the upper face of the molten metal is allowed to remain in a state that it is pushed out to the upper part than the upper face of the casting sleeve. At the time of moving horizontally the die opening/closing unit 25, the oxide film on the upper face of the molten metal is eliminated by an oxide film cutting member 44 provided in advance in the end part of the lower face of the mold opening/closing unit 26 in accordance with a height position of the upper face of the casting sleeve 14. In such a way, only a clean molten remains in the casting sleeve 14, and a casting product of a good quality and high strength is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing an oxide film formed on an upper portion of a molten metal in a casting sleeve and an oxide film removal in a vertical-type vertical casting casting device for casting a molten metal in a die. The present invention relates to a vertical casting device equipped with a device.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a disc wheel for an automobile wheel made of an aluminum alloy, for example, a vertical type vertical vertical pouring type pouring device as described in Japanese Utility Model Publication No. 1-80253. Was used for die casting.
In the apparatus described in Japanese Utility Model Laid-Open No. 1-80253, a mold opening / closing unit equipped with a mold is laterally inserted between a base platen and a movable platen that can be opened and closed in the vertical direction. In addition to performing the mold clamping operation, the vertical pouring sleeve containing the molten metal is docked in the pouring hole in the lower part of the lower die, and the casting plunger inside the pouring sleeve raises the casting sleeve to cast it in the cavity of the die. The molten metal in the casting sleeve was cast to obtain a cast product.

[0003]

When the molten metal is supplied into the casting sleeve, the surface of the molten metal comes into contact with air, so that an oxide film is formed on the upper surface of the molten metal in the casting sleeve.
Therefore, if the molten metal with an oxide film is directly cast into the mold, the oxide film will enter the cast product, reducing the strength of the product, causing cracks, and the surface of the product. The aesthetics are spoiled.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to eliminate these drawbacks, and uses a vertical type vertical casting type pouring device to provide a space between a base platen and a movable plate which can be opened and closed in the vertical direction. Then, the mold opening / closing unit with the mold attached is inserted from the lateral direction, and then the mold clamping operation is performed and the vertical pouring sleeve containing the molten metal is engaged with the pouring hole of the mold. When performing the pouring operation, the upper surface of the pouring sleeve in the vertical state is made to stand by near the lateral movement locus surface of the lower surface of the mold opening / closing unit, and the pouring plunger is raised to raise the upper surface of the molten metal in the pouring sleeve. When the mold opening / closing unit is moved laterally, the casting sleeve is raised to the position of the upper surface of the casting sleeve and only the oxide film formed on the upper surface of the molten metal is extruded to a position above the upper surface of the casting sleeve. According to the height position of the In oxide film cut members which had been provided on the lower surface end, and to except take an oxide film of the molten metal upper surface.

Further, as a vertical type vertical vertical casting type pouring device equipped with a molten oxide film removing device, a mold opening / closing unit in which a metal mold is mounted between a base platen and a movable plate which can be opened and closed in the vertical direction. In the vertical type vertical vertical pouring type pouring device in which the vertical pouring sleeve in which the molten metal is inserted can be engaged with the pouring hole of the die, The oxide film cut member that can remove the oxide film generated by the upper surface of the molten metal in the casting sleeve above the upper surface of the casting sleeve when the mold opening / closing unit is moved laterally is at the casting position. It was provided at the lower end of the mold opening / closing unit according to the height of the upper surface of the sleeve.

[0006]

[Operation] After the molten metal is supplied into the casting sleeve, the casting sleeve is made to stand by at the docking standby position to the lower mold, and the casting plunger is raised so that the upper surface of the molten metal in the casting sleeve is By raising to the upper surface position, only the oxide film formed on the upper surface of the molten metal is extruded above the upper surface of the casting sleeve, and then the mold opening / closing unit is laterally moved to move it between the base platen and the movable platen. Then, when the oxide film cutting member provided at the lower end of the die opening / closing unit passes just above the upper surface of the casting sleeve, the oxide film on the upper surface of the molten metal in the casting sleeve cuts the oxide film cutting member. Removed by action. As a result, only clean molten metal remains in the casting sleeve, and a good quality casting product can be obtained.

[0007]

1 to 4 show one embodiment of the apparatus according to the present invention, FIG. 1 is a front view, FIG. 2 is a side view, and FIG. 3 is a front view of a part of a mold opening / closing unit and a carriage, FIG. 4 is an enlarged plan view of a part of the fixed platen and the carriage. In the figure, a base platen 1 formed in a rectangular shape in a plan view is installed on the foundation of a floor surface, and a vertical mold clamping device indicated by reference numeral 2 is provided in the central portion in the longitudinal direction thereof. Has been. This mold clamping device 2 is provided with a cylinder platen 5 fixedly supported by tie bars 3 and nuts 4 standing upright at the four corners of the base platen 1, and a moving platen 6 is mounted at the center of the cylinder platen 5 as shown in FIG. A mold clamping cylinder 7 is provided which is lowered from the position to perform mold clamping described later.

Pit 45 under the floor from the base platen 1
A cylinder receiver 10 is fixedly supported by a plurality of support bars 8 hanging inward and a support base 9 fixed to the bottom surface of the pit 45. The casting device is erected and tiltably supported. The casting device 11 includes an injection cylinder 12 and a sleeve frame 13 fixed to the upper end surface of the injection cylinder 12 concentrically.
A plunger tip of a plunger 17 connected by a coupling 16 to a piston rod 15 retracted by the hydraulic pressure of a casting cylinder 12 is fitted in an inner hole of a casting sleeve 14 supported by an upper end of a sleeve frame 13 so as to be able to move forward and backward. Have been combined.

The entire casting device 11 is rotated between the upright state and the tilted state shown in FIG. 2 by the operation of the tilting cylinder 18, the molten metal is injected at the tilted position, and at the upright position. The casting sleeve 14 is engaged with the mold 39 and the molten metal is cast. Reference numeral 19 denotes an automatic hot water supply device for injecting the molten metal, and the ladle 21 is reciprocally moved between the melting furnace 20 or the holding furnace in which the molten metal is stored and the casting sleeve 14 in the tilted position to melt the molten metal at a predetermined timing. Is configured to supply.

A fixed platen 22 into which a mold opening / closing unit 26, which will be described later, is inserted is integrally formed in the central portion of the base platen 1 so as to be located directly below the mold clamping cylinder. 22a and the lower portions 22b on both sides thereof are formed in a convex shape in cross section. The base platen 1 is provided with bases 23 and 24 extending from the fixed platen 22 to the left and right sides on the floor foundation.
Two rails 25 are laid on each 24. 22 c is a hole through which the casting sleeve 14 comes in and out.

The mold opening / closing unit 26 and a device for moving the mold opening / closing unit 26 in and out of the stationary platen 22 will be described. Reference numeral 27 is a trolley provided with four wheels 29 that roll on rails 25 and rails 28 on the fixed platen 22, and have bases 23, 24 on both sides.
Although they are respectively provided on the upper side, the carriage 27 and the mold opening / closing unit 26 mounted on the same have the same configuration on the left and right, and therefore only one side will be described below.

As shown in FIG. 4, the carriage 27 is fixed to the fixed plate 22.
The opening 27a is formed in a U shape in plan view and has a width slightly larger than the width of the middle height portion 22a shown by the reference sign d in FIG. There is. In addition, the carriage 27 has a plurality of rollers 3 in two rows.
0 is rotatably pivotally mounted, and the upper end of the roller 30, that is, the upper surface of the carriage 27 is formed lower than the upper surface of the fixed platen middle height portion 22a by a distance t in FIG. Reference numeral 31 is a pair of carriage moving cylinders supported on both sides of the base 23, and the working end of the piston rod 32 thereof is the carriage 2
7 are pivotally attached to connecting fittings 33 fixed to both sides of the front end of the carriage 7. For example, by moving the piston rod 32 forwards and backwards by air pressure, the carriage 27 lowers the middle height portion 22a of the fixing plate 22 from three sides. The position of entering the plane of the portion 22b,
The fixed platen 22 is configured to advance and retreat with respect to a position where the fixed platen 22 has retreated above the base 23 as the lateral outside.

As shown in FIG. 3, the mold opening / closing unit 26 mounted on the carriage 27 is provided with a mounting base 34 formed in the shape of a rectangular plate at the lower end portion. At the center, a pair of mold opening / closing cylinders 35 are erected with their base ends fixed to a mount 34. Reference numeral 36 denotes a top frame whose two ends are fixedly supported by the working end of the piston rod 37 of the mold opening / closing cylinder 35. The top frame 36 and the mount 34 have a movable mold 38 and a fixed mold 39.
Are fixed respectively, and by moving the top frame 36 up and down by the mold opening / closing cylinder 35, the movable mold 3
8 is opened and closed with respect to the fixed mold 39, and the top frame 36 is slightly lowered after the mold matching, so that the minimum necessary mold clamping force is applied. Reference numeral 40 denotes a cylindrical guide tube which is vertically installed with its base end fixed to the four corners of the mounting base 34, and the top frame 36 is fixed to the upper end of the guide rod 41 which is fitted in the inner hole of the guide rod 41. And is configured to guide the vertical movement of the top frame 36.

The mold opening / closing unit 26 configured as described above
Are supported by the piston on the side of the carriage 27. That is, cylinders 42 are provided at four positions on the front, rear, left and right sides of the carriage 27. The die opening / closing unit 26 is supported by being fitted in the pin hole 34a and restricting the downward movement and the horizontal movement by a step portion formed in the pin hole 34a. As the piston rod 43 moves up and down, the mounting base 34 moves up and down so that the lower surface of the mounting base 34 occupies positions higher and lower than the upper surface of the fixed plate middle height portion 22a.
It is configured to enter the fixed platen 22 without touching the upper surface of 2a and to sit on the middle-high portion 22a at a low position. By further lowering the piston rod 43 while the carriage 27 is on the base 23, the mold opening / closing unit 26 is seated on the roller 30 so that the mold opening / closing unit 26 can be easily taken out from the carriage 27 for maintenance or the like. Has been done.

As shown in FIGS. 3 and 4, at the lower end of the mold opening / closing unit 26, that is, at the lower end of the mounting base 34 on the side of the fixed plate 22 and at the center, the inside of the casting sleeve 14 is provided. An oxide film cutting member 44 that can remove the oxide film that has been pushed up above the upper surface of the casting sleeve 14 by the oxide film generated on the upper surface of the molten metal when the mold opening / closing unit 26 is moved laterally to the standby position in the vertical state. It is provided according to the height position of the upper surface of a certain casting sleeve 14.

The operation of the pouring device configured as described above will be described. Before the casting operation is started, the carriage 27 is mounted on the rails 25 of the bases 23 and 24 on both sides, and the cylinder 31 for moving the carriage.
The die opening / closing unit 26 is supported on each carriage 27 while being lifted from the rollers 30 by the raised piston rod 43. At this time, the movable molds 38 and the fixed molds 39 are mounted on both mold opening / closing units 26, respectively, and the retractable action of the piston rod 37 causes the movable molds 38 and the fixed molds 39 to have the minimum necessary amount. It is clamped by the mold clamping force.

On the other hand, the entire injection device 11 is tilted by the tilting cylinder 18, and the casting sleeve 14 is tilted by the automatic water heater 19.
After supplying the molten metal into the inside, the tilt cylinder 18 erects the molten metal. Then, the upper surface of the casting sleeve 14 in the vertical state is made to stand by in the hole 22c of the stationary platen 22 near the lateral movement locus surface of the lower surface of the mold opening / closing unit 26, and the casting sleeve 14 is cast. The plunger 17 is raised to raise the upper surface of the molten metal in the casting sleeve 14 to the upper surface position of the casting sleeve 14, and only the oxide film formed on the upper surface of the molten metal is extruded to a position higher than the upper surface of the casting sleeve 14. Leave it in a state.

After this, the carriage moving cylinder 3
When the piston rod 32 of No. 1 is moved forward, the carriage 27 moves forward while rolling the wheels 29 on the rails 25 and 28,
Naturally, the mold opening / closing unit 26 also moves forward, that is, moves laterally. Then, when the mold opening / closing unit 26 is moved forward and laterally, the oxide film cutting member 44 provided at the lower end portion of the mold opening / closing unit 26 in accordance with the height position of the upper surface of the casting sleeve 14 causes the casting sleeve 14 to move. Remove the oxide film on the upper surface of the molten metal that comes out of the upper surface of the. Oxide film cutting member 44
The oxide film removed in step 6 drops at the hole 22c.

The carriage 27 continues to move forward and stops on the fixed platen 22. In this case, since the opening width D of the carriage 27 is wider than the width d of the fixed board middle height portion 22a, the carriage 27 is
Enclose easily and enter easily. At the time of entry, the head end side of the cylinder 42 is connected to the pump, and the rod end side is connected to the tank. After the entry, the head end side is also connected to the tank by switching the solenoid valve. The whole 26 descends, and the mount 34 is seated on the middle height portion 22a.

Therefore, when the mold clamping cylinder 7 is operated and the moving platen 6 is lowered, the top frame 36
Is lowered, and the molds 38 and 39 are fully clamped. in this case,
The mold clamping force acts on the fixed platen 22, that is, the strong base platen 1, and the pallet 27 is not affected by the mold clamping force. Then, the casting sleeve 14 is raised,
After engaging with the sleeve hole of the fixed mold 39, the plunger 17 is advanced and the molten metal is cast into the cavities of the molds 38 and 39.

When the cast molten metal is solidified and cooled,
When the main mold clamping by the mold clamping cylinder 7 is released and the head end side of the cylinder 42 is switched to the pump side, the mold opening / closing unit 26 rises and the mount 34 is fixed to the middle height portion 22a of the fixed platen 22.
Therefore, when the piston rod 32 of the carriage moving cylinder 31 is retracted, the carriage 34 on which the mold opening / closing unit 26 is mounted is pulled out onto the base 23.

During the above mold clamping and casting operations, the other base 2
The mold opening / closing unit 26 mounted on the trolley 27 on the upper part 4 is clamped and stands by. The casting sleeve 14 also stands by at a predetermined position. Then, the carriage 27 on the side of the base 23 is pulled out onto the base 23 and at the same time enters the mold clamping position.
At this time, similarly to the above, the oxide film on the upper surface of the molten metal in the casting sleeve 14 is removed by the oxide film cutting member 44 attached to the mold opening / closing unit 26 of the carriage 27 on the entering side. The molds 38 and 39, which have been matched in the mold opening / closing unit 26 on the carriage 27 drawn onto the base 23, are opened by the mold opening / closing cylinder 40, and the product held on the movable mold 38 side is The product is taken out by a product take-out device (not shown). In the present invention, only one carriage 27 and one mold opening / closing unit 26 can be used.

[0023]

As described above, according to the present invention, as described in the claims, the upper surface of the casting sleeve in the vertical state in which the molten metal is supplied outside the machine is located near the lateral movement locus surface of the lower surface of the mold opening / closing unit. And the casting plunger is raised to raise the upper surface of the molten metal in the casting sleeve to the position of the upper surface of the casting sleeve, and only the oxide film formed on the upper surface of the molten metal is placed on the upper surface of the casting sleeve. When the mold opening / closing unit is moved laterally, the oxide film cutting member provided at the lower end of the mold opening / closing unit in accordance with the height position of the upper surface of the casting sleeve is used to melt the molten metal. Since the oxide film on the upper surface is removed, the oxide film formed on the upper surface of the molten metal in the casting sleeve can be naturally and surely removed without any special removing operation. Therefore, the casting operation can be simply performed, a clean molten metal without an oxide film can be cast into the cavity, and it is possible to easily and easily obtain a good quality and high strength cast product containing no impurities. it can.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an apparatus for carrying out the method of the present invention.

FIG. 2 is a side view showing an embodiment of the device of the present invention.

FIG. 3 is a partial front view of a mold opening / closing unit, a carriage, etc. used in the device of the present invention.

FIG. 4 is an enlarged plan view of a part of a fixed board and a trolley used in the device of the present invention.

[Explanation of symbols]

 1 Base Platen 2 Mold Clamping Device 6 Movable Plate 11 Casting Device 14 Casting Sleeve 18 Tilting Cylinder 19 Automatic Water Heater 22 Fixing Plate 26 Mold Opening Unit 27 Bogie 32 Bogie Moving Cylinder 35 Mold Opening Cylinder 38 Movable Mold 39 Fixed Mold 44 Oxide film cutting member

Claims (2)

[Claims] 1. A vertical clamping vertical pouring type pouring device is used, and a mold opening / closing unit equipped with a mold is laterally inserted between a base platen and a movable plate which can be opened and closed vertically. Then, when performing the mold clamping operation and engaging the vertical pouring sleeve containing the molten metal with the pouring hole of the mold to perform the pouring operation, the upper surface of the vertical pouring sleeve is opened and closed. While waiting near the lateral movement locus surface of the lower surface of the unit, and raising the casting plunger to raise the upper surface of the molten metal in the casting sleeve to the upper surface position of the casting sleeve, the oxidation generated on the upper surface of the molten metal Keep only the film extruded above the upper surface of the casting sleeve, and when moving the mold opening / closing unit laterally, place it on the lower end of the mold opening / closing unit according to the height position of the upper surface of the casting sleeve. The oxide film cut member that was used to remove the oxide film on the upper surface of the molten metal. Method for removing oxide film from molten metal in vertical type vertical vertical pouring type pouring device. 2. A mold opening / closing unit equipped with a mold is provided between the base platen and a movable plate which can be opened / closed in the vertical direction so that the mold opening / closing unit can be inserted laterally, and a casting sleeve in a vertical state containing molten metal is provided. In a vertical clamp type vertical pouring type pouring device provided so that it can be engaged with the pouring hole of the die, an oxide film formed on the upper surface of the molten metal in the pouring sleeve causes the oxide film to rise above the upper surface of the pouring sleeve. The oxide film cutting member that can remove the oxide film pushed up to the side when the mold opening / closing unit is moved laterally is adjusted to match the height of the upper surface of the casting sleeve in the standby position and the oxidation of the molten metal provided at the lower end of the mold opening / closing unit Vertical type vertical vertical casting type casting device equipped with a film removing device.