JPH09122881A - Die for vertical type pressure casting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly discharge releasing agent stored on a lower die outside a die. SOLUTION: A tapered surface 14 is formed on the opening edge part of the upper end of a sleeve part 12 inserted with a pressurizing plunger 13, and an annular space part 22 formed between the tapered surface 14 and the pressurizing plunger 13 is communicated with a product shape part through a runner part 15. A groove part 17 opened outside the die is formed in the lower die 3 so as to communicate with the annular space part 22. Excess releasing agent out of that applied by spray, particularly stored in the runner part 15 and the annular space part 22 is smoothly discharged outside the die from the groove part 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die structure of a vertical pressure casting machine used in a pressure casting method such as molten metal forging,
In particular, the present invention relates to a mold structure that eliminates the accumulation of release agent on the lower mold side.

[0002]

2. Description of the Related Art In the pressure casting method using a vertical casting machine, before taking out the product after opening the mold and before shifting to the hot water supply for the next shot,
If a mold release agent is applied to the product part space (product shape part) of the mold, which is to be a cavity, and the product part space is applied to the product part space, the product part with the lower mold release agent is a peculiarity of the vertical casting machine. There is a problem of accumulating in space.

Then, when the hot water is supplied to the next shot while the mold releasing agent is accumulated, the water inside the mold lowers the mold temperature, resulting in improper running of the hot water, the mold releasing agent getting caught in the product, and the mold releasing. Due to the solid content of the agent, casting defects such as product deficiency occur, and improvement of the casting machine quality cannot be expected.

From the above, as a method of eliminating the accumulation of the release agent particularly on the lower mold side, Japanese Examined Patent Publication No. 7-53306.
As disclosed in the publication, the frame of the casting machine in which the mold is arranged is configured to be rotatable about a horizontal axis, and the mold clamping and mold opening direction is vertical or almost vertical. While maintaining the posture of the frame, casting is performed while pressurizing the molten metal after hot water supply and mold clamping,
After casting, the mold is clamped, and the mold is opened with the frame swiveled so that the mold opening direction is horizontal or nearly horizontal, and then the product is taken out in that position and then the release agent is placed in the product space. A pressure casting method has been proposed in which is applied.

According to this method, the mold release agent is applied in such a posture that the mold is clamped and the mold opening direction is horizontal or almost horizontal as described above, whereby the excess mold release is performed. Although the agent can be smoothly discharged out of the mold and the release agent can be prevented from accumulating in the mold, the structure of rotating the entire frame of the casting machine complicates the entire device and occupies a wide area. Space is inevitably secured.

Therefore, in terms of simplifying the equipment and reducing the space, it is more advantageous to have a structure in which the frame in which the mold is arranged is not swiveled, and an alternative to the swiveling method for preventing the accumulation of the release agent. Have been tried variously.

For example, as shown in FIG. 5, a product W after pressure casting is ejected using a pressure plunger 51 for pressurizing the molten metal, and then the lower mold 52 is kept in the ejected state of the pressure plunger 51. When a mold release agent is applied to the lower surface of the lower mold 52 side by the spray method or the like, in addition to the product shape portion 53 and the runner portion 54, the taper surface 56 provided as a draft at the upper end opening of the sleeve portion 55 and the pressure The mold release agent is accumulated in the annular space 57 surrounded by the outer peripheral surface of the plunger 51.

As for the product shape portion 53, a part of the slide surface of the slide core is used so that a part of the slide shape is slidable in the direction orthogonal to the paper surface of FIG. Although it is possible to discharge the release agent outside the product shape portion 53, it is difficult to sufficiently release the release agent accumulated in the runner portion 54 and the annular space 57. It has to be blown away by the method.

However, when the release agent is removed by the air blow method, the release agent is often scattered to the surroundings, so that the surrounding environment is deteriorated and the problem still remains in practical use.

In FIG. 5, the product-shaped portion 53 on the lower die 52 side and the product-shaped portion 59 on the upper die 58 side form a product portion space. Further, 60 is a sprue part.

The present invention has been made on the basis of the above-mentioned background, and instead of the turning method of turning the mold together with the frame, the surrounding environment is not deteriorated and after the release agent is applied. Smoothly discharge the excess release agent from the
It is an object of the present invention to provide a mold structure that prevents the excessive release agent from accumulating in the mold.

[0012]

According to a first aspect of the present invention, there is provided a spout provided on an upper surface of a die including a fixed upper die and a lower die that moves up and down with respect to the upper die. After supplying hot water to the inside of the mold, and closing the sprue part by a sprue block provided slidably on the upper mold,
While pressing the molten metal in the mold by the pressure operation of the pressure plunger that is vertically movably inserted and arranged in the sleeve part on the lower mold side, while pressing the plunger when removing the product after the mold is opened. A die for a vertical pressure casting machine, which is configured to extrude a product after casting by projecting to the upper surface side of the lower mold further than the pressing position, and a mold matching surface with the upper mold of the lower mold. A lower surface of the upper mold, which is a mating surface with the lower mold, while forming a groove for communicating the upper end opening edge of the sleeve opening to the upper surface of the lower mold with the outside of the lower mold. The portion is characterized in that a ridge portion is formed to fit the groove portion and close the groove portion when the mold is clamped.

When a taper surface that functions as a draft at the time of pushing out a product is formed at the upper end opening edge portion of the sleeve portion, as in claim 2, the sleeve portion side of the groove portion is formed. The bottom surface of the end of the groove is set at the same height as the boundary between the tapered surface and the general part of the sleeve, and the bottom of the groove has a downward slope toward the outside of the lower mold. Is desirable.

Thus, according to the first aspect of the invention, after the product after pressure casting is projected by the pressure plunger, the mold release agent is applied to the lower mold while the pressure plunger is in the protruding state. In this case, the shape of the product on the lower mold side, the runner that connects the shape of the product and the sleeve, and the tapered surface and the pressure plunger provided as a draft at the upper opening edge of the sleeve. The release agent temporarily accumulates in the annular space surrounded by the outer peripheral surface of the.

However, in the case where the slide core system is adopted as described above, the mold release agent accumulated in the product shape part is discharged from the mold from a part of the slide core, while the runner part and the The release agent accumulated in the annular space is smoothly discharged from the groove to the outside of the mold, and particularly when the groove has a downward slope as in the invention of claim 2, the release agent is released. The discharge efficiency of the agent is further improved.

When the die is clamped, the protrusion on the upper die side is aligned with the groove to fill the space of the groove, so that the groove is the original pressure casting method. It does not hinder the above.

[0017]

1 to 4 are views showing a typical embodiment of the present invention. As shown in FIG. 2, a mold 1 comprises a fixed upper mold 2 and a lower mold which can be raised and lowered. 3 and 3. The upper mold 2 is fixed to a stationary platen of a casting machine (not shown), while the lower mold 3 is also fixed to a movable platen,
The lower die 3 moves up and down with respect to the upper die 2 in accordance with the expansion and contraction operation of the die clamping cylinder (not shown), so that the die 1 is clamped and the die is opened.

The upper die 2 is provided with a spout portion 7 which communicates with a product portion space (cavity) 6 formed by a product shaped portion 4 on the upper die 2 side and a product shaped portion 5 on the lower die 3 side. Besides, a guide groove 8 is formed so as to intersect with the sprue 7. Further, the guide groove 8 is provided with a gate closing block 10 that slides in a direction orthogonal to the axial center direction of the gate part 7 according to the expansion and contraction operation of the cylinder 9. The gate closing block 10 has the gate part. A passage 11 is formed which communicates with 7 and becomes a part of the sprue 7.

On the other hand, the lower die 3 is provided with a sleeve portion 12 whose upper end opens to the upper surface portion of the lower die 3 along the vertical direction, and the sleeve portion 12 has a pressure plunger 1
3 is inserted so as to be vertically movable. Sleeve part 12
Is set so as to be located on the same axis as the sprue part 7 on the upper die 2 side. As will be described later, the molten metal poured from the sprue part 7 is in the upper space of the pressure plunger 13 of the sleeve part 12. It will be stored once.

Further, the upper end opening edge of the sleeve portion 12 has a tapered surface 1 of about 2 to 5 ° which functions as a draft.
4 is formed, and the portion where the tapered surface 14 is formed communicates with the product shape portion 5 on the lower die 3 side via the runner portion 15. Further, as shown in FIG. 3, a groove portion 17 having a substantially inverted trapezoidal cross section is formed on the mold matching surface 16 of the lower mold 3. One end of the groove portion 17 communicates with a portion of the sleeve portion 12 where the tapered surface 14 is formed, and the other end is open to the outer surface 3a of the lower mold 3, so that the groove portion 17 itself is on the outer surface 3a side. It has a descending slope toward. As a result, in the mold open state as shown in FIGS. 1 and 4, the space near the upper end opening edge of the sleeve portion 12 communicates with the outside of the lower die 3 via the groove portion 17.

Here, in this embodiment, the height positions of the bottom surface of the product-shaped portion 5 on the lower die 3 side and the bottom surface of the runner portion 15 are:
The boundary portion 18 between the straight general portion 12a and the tapered surface 14 of the sleeve portion 12 is set at the same height position, and the height position of the end portion of the groove portion 17 on the tapered surface 14 side is also the boundary portion 18. However, the bottom surface of the runner part 15 may be higher than the bottom surface of the product shape part 5 depending on the shape of the product W to be cast.

On the other hand, a ridge portion 20 having the same cross-sectional shape as the groove portion 17 is formed on the die matching surface 19 on the side of the upper die 2 facing the groove portion 17. As a result, when the mold is clamped, the groove portion 17 and the ridge portion 20 are fitted to each other so that the space of the groove portion 17 is closed.

Therefore, in the mold structure configured as described above, as shown in FIG. 2, the upper mold 2 and the lower mold 3 are clamped together, and the passage 11 is made to coincide with the sprue part 7 and both are closed. In order to communicate with each other, the gate closing block 10 is positioned at the gate opening position P ₁ shown by an imaginary line in FIG.
Hot water is supplied from the sprue part 7 through the passage 11 to the upper space of the pressure plunger 13 of the sleeve part 12 using a ladle (not shown). However, at this time, the pressure plunger 13
Is at a position lower than the position shown in FIG.

After the hot water is supplied, the gate closing block 10 is slid to the gate closing position P ₂ shown by the solid line in FIG. 2 by the operation of the cylinder 9, and the passage 11 is positionally displaced from the gate 7 to move the gate 7 to the gate. After being closed by the closing block 10, the pressurizing plunger 13 is moved up to the pressurizing position shown by the solid line in FIG. 2 to pressurize the molten metal while filling the product space 6.

As a result, due to the pressurizing effect in the solidification process of the molten metal, the generation of shrinkage cavities and the adverse effects of residual gas are suppressed, the structure of the casting is densified, and a high-quality casting without casting defects is obtained. Will be done.

When casting is completed as described above,
As shown in FIG. 4, after the mold 1 is opened, the pressure plunger 13 is moved from the pressure position (the position shown in FIG. 2) up to that point to a position above the lower mold 3 and the product protruding position shown by the solid line in FIG. The product W is pushed away from the lower mold 3 by the pushing operation of the pressure plunger 13.
The product W extruded from the lower mold 3 in this manner is taken out of the mold and collected by a handling device (not shown) or manual work.

When the product W has been taken out as described above, the pressure plunger 13 is kept in the protruding position shown in FIG. 4 and is prepared for the next shot.
As shown in FIG. 1, the upper mold 2 is formed by using a spray nozzle 21 or the like.
Then, the mold release agent Q is sprayed and applied to the product shape portions 4 and 5 which will be the product portion space 6 of the lower mold 3.

At this time, the surplus mold release agent applied to the upper mold 2 side is dripped on the upper surface of the lower mold 3 as it is, while the surplus mold release agent on the lower mold 3 side is combined with the product shape portion on the lower mold 3 side. 5, the runner portion 15, or the annular space portion 22 formed between the tapered surface 14 of the upper end opening edge portion of the sleeve portion 12 and the outer peripheral surface of the pressure plunger 13 once accumulates.

However, when the product shape part 5 on the lower die 3 side shown in FIG. 1 adopts a slide core which is slidable in the direction orthogonal to the paper surface of the figure, the product shape part 5 and the runner part 15 are provided. Excess release agent is discharged to the outside of the mold through the slide surface of the slide core as a passage, while the excess release agent of a part of the annular space portion 22 and the runner portion 15 passes through the groove portion 17 and leaves the mold. Is discharged to.

Even when the slide core as described above is not used in the product shape part 5, the product shape part 5
Since the bottom surface of the runner portion 15 and the bottom surface of the runner portion 15 are set at the same height position, the excess release agent of the product shape portion 5 and the runner portion 15 together with the excess release agent of the annular space portion 22. Groove 1
It is possible to prevent the excess release agent from being discharged to the outside of the mold through 7 and accumulated in the mold.

Therefore, in addition to the original purpose of the release agent,
There is no problem even if a large amount of mold release agent is sprayed as a means for quickly cooling the upper and lower molds 2 and 3, and the time required for lowering the mold temperature can be greatly shortened.

When the release agent is sufficiently applied to the upper and lower molds 2 and 3 in this way, the pressure plunger 13 is lowered to the initial position, and then a small amount of release agent is applied to the inner circumference of the sleep portion 12 by a spray nozzle or the like. Apply the agent and move to the next shot.

[0033]

As described above, according to the first aspect of the present invention, the surplus mold releasing agent accumulated in the product shape portion and the runner portion on the lower die side can be smoothly discharged out of the die from the groove portion. As a result, the excess mold release agent can be blown off by air blow, as long as it does not increase the size of the casting machine and the occupied space as in the conventional method in which the mold is rotated together with the frame to discharge the mold release agent. It does not cause deterioration of the surrounding environment unlike the method.

Further, as in the invention described in claim 2, by forming a groove portion having a downward slope in a continuous manner on the taper surface of the upper end opening edge portion of the sleeve portion, the taper surface and the pressurizing plunger are formed. Not only can the surplus mold release agent accumulated in the annular space between and be discharged, the discharge efficiency of the mold release agent can be further improved.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention and is a cross-sectional explanatory view of a mold when a release agent is applied.

FIG. 2 is an explanatory sectional view of the mold shown in FIG. 1 during pressure casting.

FIG. 3 is a right side view of a main part of FIG. 2;

FIG. 4 is a cross-sectional explanatory view when the mold is opened from the state of FIG. 2 and a product is projected.

FIG. 5 is a cross-sectional explanatory view of a main part of a conventional mold structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mold 2 ... Upper mold 3 ... Lower mold 4, 5 ... Product shape part 6 ... Product part space 7 ... Gate part 10 ... Gate closing block 12 ... Sleeve part 13 ... Pressurizing plunger 14 ... Tapered surface 15 ... Runway Part 16, 19 ... Mold matching surface 17 ... Groove 18 ... Boundary 20 ... Ridge 21 ... Spray nozzle 22 ... Annular space Q ... Release agent W ... Product

Claims (2)

[Claims] 1. Hot water is supplied to the inside of the mold from a gate provided on the upper surface of the mold, which is composed of a fixed upper mold and a lower mold that moves up and down with respect to the upper mold. After closing the gate with a slide block provided slidably, the molten metal in the mold is pressurized by the pressure operation of a pressure plunger that is vertically movably inserted into the lower sleeve part. While casting, the vertical pressure casting machine is designed to push out the cast product by ejecting the pressure plunger further to the upper surface side of the lower mold than the pressing position when taking out the product after the mold is opened. A die for use in an upper surface of a lower die, which is a mating surface with the upper die, and a groove portion for communicating an upper end opening edge portion of a sleeve portion opened to the upper surface of the lower die to the outside of the lower die. And the lower mold of the upper mold The lower surface portion serving as Align surface,
A die for a vertical pressure casting machine, characterized in that a ridge portion is formed to be fitted into the groove portion when the die is clamped to close the groove portion. 2. A tapered surface that functions as a draft when pushing out a product is formed at an upper edge of an opening of the sleeve portion, and a bottom surface height of an end portion of the groove portion on the sleeve portion side is a tapered surface. 2. The sleeve is set at the same height as the boundary formed by the general portion, and the bottom surface of the groove has a downward slope toward the outside of the lower die. Mold for vertical pressure casting machine described.