JP2577988B2 - Die casting machine injection equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device of a die casting machine, and more particularly, to a plunger for an injection sleeve to arbitrarily change the amount of molten metal in an injection sleeve, that is, the amount of molten metal. The present invention relates to an injection apparatus in which the relative position of a chip is changed and the injection sleeve is docked (fitted) to a predetermined position of a mold while maintaining the relative position.

[Prior Art] In a die casting machine, whether or not a molten metal in a high temperature state can be cast into a mold cavity with a minimum temperature drop has a significant influence on the quality of a molded product. . This is because the viscosity of the molten metal increases with a decrease in the temperature of the molten metal, which causes poor running of the molten metal in the mold cavity. Therefore, since it is necessary to cast the molten metal into the mold cavity in a time as short as possible, a high injection speed is required for the die casting machine. However, as the injection speed is increased, the molten metal surface in the injection sleeve or the mold cavity becomes turbulent and scatters, so that the atmosphere is involved and bubbles are included in the molding process. Therefore,
In the molded product, voids other than the substance of the molten metal, that is, cavities are formed, and there are many problems in terms of strength, pressure resistance, and liquidproofness (non-leakage) of the molded product.

As is clear from the above description, to obtain a good die-cast molded product at a low speed without disturbing the molten metal surface, and
It suffices that the time required for the molten metal in the injection sleeve to move into the mold cavity is shortened and casting is performed.

[Problems to be Solved by the Invention] In order to shorten the moving time of the molten metal, the moving distance of the molten metal from the injection sleeve to the mold cavity may be minimized. Since the molten metal amount is different, the relative position between the injection sleeve and the plunger tip is set to a single and linked type injection device cannot cope with a variable molten metal amount. Since a large drop occurs between the upper surface of the molten metal stored in the
A useless moving distance occurs. In addition, since the head is large, the surrounding air is easily entrained in the event of a fall.

[Means for Solving the Problems] Therefore, in the injection device of the present invention, after the hot water is supplied to the tilted injection sleeve, the tilting return is performed.
In a die casting machine having an injection device for docking an injection sleeve to a lower part of a mold by interlocking a block for supporting the injection sleeve, a plunger tip forming the bottom of the injection sleeve, and the injection plunger, a plurality of positions in the axial direction of the injection plunger. The block has a structure in which a through-hole is provided at right angles to the axial direction, and a hydraulic cylinder having a piston rod that penetrates through the through-hole and fits into and reaches a lock hole formed in the inner surface of the block is provided in the block. .

[Operation] With the above-described configuration, it is necessary to stop casting of a molded product that has been operating up to that time and cast another type of molded product. Needs to be changed, the relative position of the plunger tip with respect to the injection sleeve must be changed. That is, when the molten metal is supplied to the injection sleeve, the position of the plunger tip is adjusted so that the upper surface of the molten metal is close to the upper end of the injection sleeve so that the amount of molten metal for one time does not overflow the injection sleeve, and is disposed in the block. The axis of the hydraulic cylinder and the axis of one of the plurality of through holes provided in the plunger are aligned with each other, the piston rod of the hydraulic cylinder is advanced, and the tip of the piston rod is penetrated through the through hole and the end of the block. Set in the lock hole drilled in the inner surface of the other end. Thus, the block and the plunger are temporarily engaged and integrated.

Then, turn off the oil pressure at the inlet and outlet of the injection cylinder.
After loading, when the block is raised, the plunger tip is raised in conjunction with the block, and the injection sleeve is docked at a predetermined position in the mold. Thereafter, the lock is released (the piston rod of the hydraulic cylinder is retracted to the retreat limit), and the injection cylinder is advanced to inject and fill the mold cavity with the molten metal.

[Embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings, in connection with a conventional example.

FIG. 1 is a longitudinal sectional view of an injection device showing an embodiment according to the present invention, and FIG. 2 is a partially enlarged sectional view of FIG. FIGS. 3 and 4 are longitudinal sectional views showing a conventional embodiment. FIG. 3 shows a state in which the sleeve is tilted, and FIG. 4 shows a state in which the sleeve is tilted back.

In the figure, 1 is a movable mold, 2 is a fixed mold, 3 is a mold cavity, 4 is an injection sleeve, 5 is an injection sleeve 4
A plunger tip slidably provided therein, 6 is a block provided integrally with the injection sleeve 4, 7 is a plunger having a plunger tip 5 attached to the distal end, 8 is an injection cylinder, and 9 is a tilt of the injection cylinder 8. Axis for turning, 10
Is a molten metal, 11 is a ladle, and 12 is a projection from a collar or the like provided at a connection portion between the piston rod 13 of the injection cylinder 8 and the plunger 7. The plunger tip 5 and the plunger 7 form an injection plunger.

The block 6 is formed in a hollow conical shape. A flange-shaped engaging portion 14 is formed inside the lower end of the block 6. The upper surface of the engaging portion 14 has a coupling which is a connecting portion between the piston rod 13 and the plunger 7 and a collar below the coupling. It is engaged with the outer peripheral portion of the lower surface of the convex portion 12 formed by utilizing the above. Then, when the block 6 is raised, the projection 12 is held by the engaging portion 14 and the projection 12 is also raised integrally, so that the plunger tip 5 and the injection sleeve 4 can always be raised at the same time. ing.

A cylinder 15 is formed in the block 6 in the vertical direction, and the tip of a ram 16 fixed to the rod end side of the injection cylinder 8 is slidably fitted in the cylinder 15.
It is configured such that hydraulic oil is supplied from a hydraulic source (not shown) into the cylinder 15 through the ram 16 via the port c, and the block 6 can be raised.

According to the present invention, in addition to the above configuration, a through hole 21 is provided at a plurality of positions in the axial direction of the injection plunger 7 at substantially equal intervals in a direction perpendicular to the axis as shown in FIG. A hydraulic cylinder for positioning lock was fixed to one end of the block with a bolt so that the end of the piston rod 20a fits into the other end of the block. It is desirable that all of the through hole 21, the lock hole 22, and the tip of the piston rod 20a be chamfered.

 Next, the operation of the device will be described.

FIG. 3 shows a state where the entire injection device is tilted by a tilting device (not shown), and the molten metal 10 is poured from the ladle 11 to the injection sleeve 4. After the pouring is completed, the entire injection device is tilted and restored, that is, the entire injection device is rotated around the shaft 9 to return to the original upright state. This is the state shown in FIG.

Thereafter, the block 6 is raised by guiding the hydraulic pressure into the cylinder 15 through the port c, and the injection sleeve 4 is fitted to the fixed mold 2. At this time, since the plunger 7 is lifted up by the convex portion 12 due to the rise of the block 6, the relative position between the injection sleeve 4 and the plunger tip 5 does not change and rises together, and there is no shaking (swaying) of the molten metal.

Then, the hydraulic pressure is introduced to the port a to apply pressure to the head side of the injection cylinder 8 to start the ascending of the injection plunger 7 and the plunger tip 5, and accordingly, the molten metal 10 is removed from the molds 1 and 2. The cavity 3 to be formed is filled.

The above is the basic operation state of the conventional apparatus and the apparatus of the present invention. However, the liquid level in the injection sleeve after pouring shown in FIG. 4 is much lower than the upper end of the injection sleeve. Therefore, as described above, the moving distance when filling the cavity with the molten metal is large, so that the unnecessary stroke is advanced and retreated in each injection operation, and the cooling is quick. In addition, there is a disadvantage that the surrounding gas is easily entrained in the molten metal due to a long falling distance during pouring.

In the present invention, for some reason, it is necessary to change the mold and manufacture another molded product of a small article. When the amount of hot water supply is reduced once, as shown in FIG. in order to set so that the surface of the molten metal after does not overflow from the injection sleeve to a position of the injection sleeve upper end closer such plunger tip (position shown in L _0), to select the through hole of the optimal movement of the plunger After that, the hydraulic cylinder 20
To lock the piston rod 20a forward, through, and into the lock hole. Thereafter, tilting, pouring, tilting and returning, the hydraulic pressure of the injection cylinder is set to off-load, and then the block is raised as described above. At this time, the projection 12 and the engaging portion 14 of the injection plunger 7 are not in contact with each other, and the injection sleeve 4 and the plunger tip 5 rise in conjunction with the engagement of the through hole 21 and the piston rod 20a. I do.

After the mold is docked, the lock to the through hole is released (the piston rod 20a of the hydraulic cylinder 20 is retracted), and the plunger tip 7 is advanced by the injection cylinder to fill the mold with the molten metal.

When the injection sleeve and the plunger tip are raised in conjunction with each other by using the convex portion 12 and the engaging portion 14, it is necessary to provide an electric interlock so as to hold the piston rod of the hydraulic cylinder 20 at the retreat limit. There is. Also, the convex part
The use of the contact between 12 and the engaging portion 14 is performed during the operation requiring the maximum hot water supply amount among the molded products of the die casting machine,
Also in this case, it is desirable to set the projection 12 on the plunger 7 so that the surface of the molten metal is near the upper end of the injection sleeve after the supply of hot water to the injection sleeve is completed. Further, the protrusion 12 and the engaging portion 14 may be eliminated.

As described above, in the present invention, even if the molded product of the die casting machine is changed and the hot water supply amount is changed, the relative position of the plunger tip with respect to the injection sleeve is adjusted by operating the hydraulic cylinder in accordance with the change. Since the injection plunger can be locked by penetrating the piston rod into the hole, the injection sleeve and the plunger tip can be interlocked and docked to the mold.

[Effects of the Invention] In the present invention, the position of the plunger tip is appropriately changed according to the amount of hot water supplied, so that the surface of the molten metal in the injection plunger can always be held near the upper end of the injection sleeve, so that there is no useless movement distance, and therefore the molten metal It is possible to secure the optimal injection state with little cooling and solidification of the material.

Therefore, the temperature of the molten metal is reduced, the viscosity of the molten metal is increased, and poor running of the molten metal in the mold can be prevented as much as possible. Also, since air is not entrained during pouring, the strength, pressure resistance, and liquid resistance are excellent. Quality injection products can be obtained easily and reliably.

[Brief description of the drawings]

1 and 2 show an embodiment according to the present invention. FIG. 1 is an overall longitudinal sectional view of an injection device, and FIG. 2 is a partially enlarged sectional view. 3 and 4 are longitudinal sectional views showing a conventional embodiment. 1 ... fixed mold, 2 ... movable mold, 3 ... cavity,
4 ... Injection sleeve, 5 ... Plunger tip, 6 ...
Block 7 Injection plunger 8 Injection cylinder 12 Projection 14 Engagement 15 Cylinder 16
... ram, 20 ... hydraulic cylinder, 20a ... piston rod, 21 ... through hole, 22 ... lock hole.

Claims (1)

(57) [Claims] After a hot water is supplied to a tilted injection sleeve, the injection sleeve is tilted and restored, and a block for supporting the injection sleeve, a plunger tip forming the bottom side of the injection sleeve, and an injection plunger are linked to each other, so that the injection sleeve is moved. In a die casting machine having an injection device for docking to a lower part of a mold, a through hole is provided at a plurality of positions in an axial direction of an injection plunger at right angles to an axial direction, and a lock hole penetrates the through hole and is formed in an inner surface of the block. An injection device for a die casting machine, wherein a hydraulic cylinder having a piston rod that fits into and reaches the block is disposed in the block.