JPH0685988B2 - Rotating arm in induction heating centrifugal casting machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal casting machine, and more particularly to a rotary arm mechanism in which a melting crucible and a mold are installed in an induction heating type centrifugal casting machine.

(Prior Art) Among induction heating type centrifugal casting machines, a crucible (crucible) and a mold are installed at the end of an arm, the crucible is heated by an induction heating method to melt metal, and the arm is rotated to generate. There is a device for casting molten metal by using centrifugal force into a mold.

FIG. 6 is a schematic view of a rotary arm in the prior art.
Reference numeral 1 denotes an arm, which is provided with a rotation drive mechanism on a spindle 2. Reference numeral 3 denotes a crucible mount provided at the end of the arm 1, which is movable adjacent to a mold mount 4 provided at two shaft ends parallel to the arm 1. The crucible 5 is fixed to the crucible mount 3 and the mold 6 to the mold mount 4. Reference numerals 7 and 7 denote crucible moving springs, which are compressed by the crucible 5 when the metal is melted and press the crucible 5 against the mold 6 by elastic force during casting. Reference numeral 8 is a stopper for positioning the arm 1.

The rotation direction of the arm 1 during casting is counterclockwise in the drawing. When the metal is melted, first, the arm 1 is rotated clockwise from the free state to lock the arm 1 on the stopper 8 to position the entire arm.

Since the molten metal is supplied from the crucible to the mold dynamically during the acceleration of the arm (correctly, the metal in the crucible), the molten metal is affected by not only the centrifugal force but also the angular acceleration force, and the crucible spout Since the molten metal is not poured straight into the mold from the above, there is a problem in the prior art that a part of the molten metal leaks from the center of the mold at the start of casting.

FIG. 7 illustrates the relationship between the centrifugal force and the angular acceleration force. The direction in which the molten metal is ejected from the spout of the crucible is delayed from the acting direction of the centrifugal force with respect to the rotating direction of the arm. As a result, the above problems occur.

(Problem to be Solved by the Invention) A problem to be solved by the present invention is to provide a rotary arm of an induction heating centrifugal casting machine in which molten metal is prevented from leaking from the center of a mold at the start of casting in which molten metal is poured from a crucible. It is to be.

(Means for Solving the Problem) Means for solving the problem in the present invention is to install a crucible and a mold on an arm, heat the crucible while the arm is stopped to melt the metal, and rotate the arm after melting. In an induction heating type centrifugal casting machine in which molten metal in a crucible is poured into a mold by centrifugal force, a main arm that is rotationally driven by a rotary drive mechanism, and one end of the main arm is horizontally rotatable. A shaft-attached sub arm, a crucible provided on the sub arm, a mold having a spout facing the spout of the crucible, stopper pins provided downward on both the main arm and the sub arm, and the stoppers. A stopper body corresponding to the pin, movable in the vertical direction, and engaged with each stopper pin, the stopper body, the stopper pin of the main arm and the strike of the sub arm. It is characterized in that the sub arm is set at an angle delayed with respect to the rotation direction of the main arm when engaged with the upper pin together.

(Operation) The metal in the crucible 26 is heated by the induction heating method, and heating is performed while the arm is stopped.

When setting the arm for heating the crucible 26, the sub arm 19 is positioned with respect to the main arm 10 so as to form an angle behind the rotation direction of the arm. When the metal is melted in the crucible 26, the arm is rotated. Since the sub-arm 19 receives an angular acceleration force in addition to the centrifugal force of the arm, molten metal is ejected in a direction delayed from the line of action of the centrifugal force with respect to the rotation direction, but the sub-arm 19 is delayed from the main arm 10. The crucible 26 spout and the secondary arm 19
The lines of centrifugal action generated in the mold coincide with each other, and the molten metal is supplied straight from the pouring port of the crucible to the mold 26.

Further, when setting the arm for heating the crucible, the stopper body 30 is pushed up and the first stopper pin 27 of the main arm 10 is inserted into the hole provided in the stopper body 30 to position the main arm 10. First, the second stopper pin 28 of the sub arm 19 is inserted into the other hole of the stopper body 30 to position the sub arm 19, whereby the main arm 10 and the sub arm 19 are moved to a predetermined position. Set to angle.

(Embodiment) FIGS. 1 to 3 show a first embodiment. In these drawings, a spindle 11 is fixed to a central portion of a main arm 10, and the spindle 11 is provided on a machine base 12. Is rotatably inserted in the bearing body 13. Further, the support shaft 11 is provided with a pulley 14 at a portion protruding from the lower end of the machine base 12, and the pulley 14 is rotationally driven by a belt 16 connected between the drive wheel of a drive motor 15 and the support shaft 11. The main arm 10 rotates together with the shaft 11.

The main arm 10 is provided with a balancer 17 at one end, and a sub arm 19 is pivotally provided at the other end in a horizontal direction by a pivot 18.

The sub arm 19 is provided with two horizontal shafts 22 parallel to each other between the mounting portion 20 and the mold mounting base 21, and the crucible mounting base is provided on the horizontal shaft 22.
23 is slidably provided. Also, the above crucible mount
A spring 24 is mounted between the mounting portion 20 and the mounting portion 23 and is urged toward the mold mounting base 21. 25 is the mold mount
With the mold installed in 21, the sprue is directed toward the crucible mount 23. In addition, the crucible mount 23 is provided with a molten metal spout as a mold.
Place the pot 26 facing toward 25.

In addition, a first stopper pin 27 is attached to the main arm 10.
A second stopper pin 28, which is shorter than the first stopper pin 27, is provided on the crucible mount 23 of the sub arm 19 in the downward direction.

Two vertical axes 29 are provided on the machine base 12 so as to be vertically movable through the corresponding machine base 12, and stoppers corresponding to the main arm 10 and the sub-arm 19 are provided at the upper end of the vertical axis 29. A body 30 is provided, and the portions projecting downward from the machine base 12 are connected by a connecting member 31. The connecting member 31 is provided with a handle 32.
By this operation, the stopper body 30 moves up and down along with the vertical axis 29.

Further, the stopper body 30 is provided with an induction heating generating coil 33 for heating the crucible 26. Furthermore, the above crucible 26
In order to set the sub arm 19 at a position for heating, the hole 30 for inserting the first stopper pin 27 and the hole 35 for inserting the second stopper pin 28 are formed in the stopper body 30.
Therefore, the stopper body 30, the first stopper pin 27, and the second stopper pin 27
When the stopper pins 28 of are both inserted into the holes 34 and 35 and both are engaged with the stopper body 30, the sub arm 19 becomes the main arm.
It is set at a position that is behind the rotation direction with respect to 10 (see FIG. 1).

In addition, a code for energizing the induction heating generation coil 33, a limit switch that pushes down the handle 32 to send a start signal to the drive motor 15, and moves the crucible mount 23 against the springs 24, 24. Handles are provided, but they are not shown in the drawings.

The embodiment has the above-mentioned structure, in which the stopper body 30 is pushed up by the handle 32 and the first stopper pin 27 of the main arm 10 is inserted into the hole 34 provided in the stopper body, whereby the position of the main arm 10 is changed. Fix it first. Next, the second stopper pin 28 of the sub arm 19 is inserted into the other hole 35 of the stopper body 30, and this work is performed by the crucible mount 23.
Is moved toward the mount 20 against the spring 24, and then both are engaged.

As shown by the solid line in FIG. 1, the stopper body 30, the first stopper pin 27 and the second stopper pin 28 are all inserted into the holes 34 and 35 and are engaged with the stopper body 30. The sub arm 19 is positioned at an angle behind the main arm 10 with respect to the rotation direction.

When the main arm 10 and the sub arm 19 are fixed at this position,
Since the crucible 26 is loaded into the induction heating generation coil 33,
After the arm is set at a fixed position, the induction heating generating coil 33 is energized to heat the crucible 26 which causes induction heating. Then, when the metal is melted in the crucible 26, the stopper body 30 is pushed down by the handle 32, the main arm 10 and the sub arm 19 are brought into a free state, and at the same time, the drive motor 15 is energized by the lowering of the stopper body 30 to drive the drive motor 15. Driven.

When the stopper body 30 and the second stopper pin 28 are disengaged, the spout of the crucible 26 pushed out by the spring 24 of the crucible mount 23 approaches the gate of the mold 25. At the same time, the main arm 10 and the sub arm 19 start rotating counterclockwise in FIG. The molten metal in the crucible 26 is ejected from the spout toward the mold 25 by the centrifugal force.
Is applied with angular acceleration in addition to the centrifugal force of the entire arm, so that the direction of centrifugal action applied to the sub arm 19 itself is an angle behind the centrifugal action line of the entire arm, but when the arm is set, the sub arm Since 19 is installed in a direction delayed from the main arm 10 with respect to the rotation direction, the molten metal is supplied straight to the mold 25 from the start of rotation (see FIG. 8).

As the arm continues to rotate, the sub arm 19 gradually approaches the direction in which it is integrated with the main arm 10 due to the action of centrifugal force, and finally the main arm 10 and the sub arm 19 become integrated as shown by the chain line in FIG. The molten metal in the crucible 26 is entirely supplied into the mold 25.

4 and 5 show the second embodiment. The first embodiment has a structure in which the stopper pin is inserted into the stopper body, but in this embodiment, the both are coupled by the ratchet mechanism.

The first stopper leg 36 of the main arm 10 engages the locking portion 37 at the lower end with the first ratchet 38 provided on the stopper body 30,
The second stopper leg 39 of the sub arm 19 engages the locking portion 40 at the lower end with the second ratchet 41. A downwardly projecting piece 42 is provided at the lower end of the engaging portion 40 of the second stopper leg 39, and when the second ratchet 41 and the engaging portion 40 are engaged, the protruding piece 42 is provided. 42 is locked to the side of the ratchet 41 to prevent the crucible mount 23 from moving toward the mold mount 21.

In the second embodiment, the first stopper leg 36 and the second stopper leg 39 may have the same length, and the arm is fixed by rotating the main arm 10 to move the first stopper leg 36 to the first ratchet 38. Then engage the secondary arm 19 and move the crucible mount 23 against the spring 24 towards the mount 20 and then the second stopper leg 39.
Are engaged with the second ratchet 41.

It should be noted that if the stopper body 30 is pushed down, the engagement between the first and second stopper legs 36 and 39 and the first and second ratchets 38 and 41 is released, and thereafter, the same steps as those in the first embodiment are performed. To do.

(Effects of the Invention) The present invention is one in which an arm for generating a centrifugal force is pivotally coupled to a main arm and a sub arm, and a crucible and a mold are installed in the sub arm. By setting the arm at an angle behind the rotation direction with respect to the main arm, molten metal can be poured straight into the mold from the start of rotation of the arm, and therefore molten metal may leak from the gate of the mold. Can be prevented.

Further, a stopper pin is provided on the main arm and the sub arm, and the fixed position of the main arm and the sub arm is set by engaging the stopper pin with a vertically movable stopper body. It facilitates and improves reliability.

[Brief description of drawings]

1 to 3 show the first embodiment, FIG. 1 is an overall plan view, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a sectional view taken along BB of FIG. 2, FIG. FIG. 5 is a second embodiment and FIG. 4 is a front view of an engaging portion, FIG. 5 is a perspective view showing an engaged state of a stopper leg and a ratchet, and FIG. 6 is a plan view of a prior art, FIG. 7 is an explanatory view showing a protruding direction of molten metal according to a conventional technique, and FIG. 8 is an explanatory view showing a protruding direction of molten metal according to the present invention. 10 …… Main arm, 11 …… Spindle 12 …… Machine base, 13 …… Bearing body 14 …… Pulley, 15 …… Drive motor 16 …… Belt, 17 …… Balancer 18 …… Axis, 19 …… Sub Arm 20 …… Mounting part, 21 …… Mold mounting base 22 …… Horizontal axis, 23 …… Crucible mounting base 24 …… Spring, 25 …… Mold 26 …… Crucible, 27 …… First stopper pin 28 …… Second stopper pin, 29 ...... Vertical axis 30 ...... Stopper body, 31 ...... Connection member 32 ...... Handle, 33 ...... Induction heating generation coil 34, 35 ...... Hole

Claims (3)

[Claims] 1. A crucible and a mold are installed on an arm, and the crucible is heated while the arm is stopped to melt the metal. After the melting, the arm is rotated and the molten metal in the crucible is poured into the mold by centrifugal force. In the induction heating centrifugal casting machine described above, a main arm that is rotationally driven by a rotary drive mechanism, a sub arm that is rotatably attached to one end of the main arm in a horizontal direction, a crucible provided on the sub arm, and A mold provided with the sprue facing the spout of the crucible, stopper pins provided on both the main arm and the sub-arm downward, and corresponding to the stopper pins and movable in the vertical direction and engaged with the stopper pins. With a stopper body that fits,
A guide characterized in that when the stopper body is engaged with the stopper pin of the main arm and the stopper pin of the sub arm, the sub arm is set at an angle behind the rotation direction of the main arm. Rotating arm in heating type centrifugal casting machine. 2. The rotary arm in an induction heating centrifugal casting machine according to claim 1, wherein the stopper pin of the main arm is formed shorter than the stopper pin of the sub arm. 3. The induction heating type centrifuge according to claim 1, wherein the main arm and the sub arm are provided with stopper legs facing downward, and the stopper body is provided with a ratchet that engages with each of the stopper legs. Rotating arm in casting machine.