JPS5838636A - Metal mold for casting - Google Patents

Abstract

PURPOSE:To prevent the generation of casting defects on account of insufficient gas venting by constituting the liner in a metal mold for casting of an outside liner and an inside liner, forming venting ways between both liners and making at least one of the liners movable with respect to a master mold. CONSTITUTION:A metal mold 1 for casting is constituted of a stationary mold 2 and a movable mold 3, and an outside liner 5 is mounted in a master mold 4 forming the outside flask of the mold 3. A sliding guide 7 is projected on the inner slide surface 6 of the outside liner, and the liners are assembled slidably with an inside liner 8 having a flange 9 and a bracket 11 provided with a groove 10 projected to the flange 9 and the slide surface 6. When molten metal is cast into the cavities 14 formed between the outside liner 5 and the inside liner in said state, the gas in the cavities 14 is released through the vent ways formed by the clearance between both liners 5 and 8. After the solidification of the casting, the mold 3 is moved upward and the casting is removed; thereafter the liner 8 is slided into the cavities 14, and the mold release agent, etc. on the slide surface 6 are washed away. The liner is slided back to form casting cavities 14 freshly so as to be ready for the next casting.

Description

DETAILED DESCRIPTION OF THE INVENTION The disclosed technology belongs to a technical field in which the insert inside the main mold is freely moved forward and backward to facilitate degassing.

Therefore, in this invention, the movable mold opens and closes the fixed mold, clamps the mold, and opens the mold.The insert attached to both molds can be divided into a plurality of parts, and the insert can be divided into a plurality of molds by one of the two molds. The invention relates to a casting mold in which the insert is composed of an outer insert and an inner insert, and a gas vent is formed between the outer insert and the inner insert. At least one of the outer insert and the inner insert is linked with an actuator, and a slide guide is formed on the sliding surface of the outer insert and the inner insert, and the gap forms a gas vent path, so that the above-mentioned The present invention relates to a casting mold in which the core insert is slid relative to the cavity toward the cavity using the actuator, so that the sliding surface is exposed.

As is well known, a capitei is formed by clamping a fixed mold and a movable mold, and in order to produce a molded product with a complex shape, it is necessary to cut the mold according to the shape, and to design and manufacture the mold offshore. In consideration of ease of construction, a structure formed by combining a plurality of nests is generally adopted.

Therefore, if the gas in the complexly shaped cavity is insufficiently vented, there is a risk of causing casting defects.

Therefore, an appropriate gap is provided between the joint surfaces of each of the inserts, and gas is vented through the gap to prevent the above-mentioned casting defects.

However, when casting is repeated in this manner, the gap is gradually closed by the mold release agent applied to the cavity, and the casting defects appear as a result. This method not only requires strict product control, but also has the disadvantage of increasing manufacturing losses.

To deal with this, a method has been devised to widen the gap between the joint surfaces to improve gas flow, but this makes it easier for molten metal to enter the gap, creating harmful burrs on the casting, and thus preventing secondary processing. However, there was a problem in that this requirement made the work process cumbersome and resulted in an increase in costs.

The purpose of the present invention is to solve the problem of degassing of a casting mold based on the above-mentioned prior art, by making a plurality of inserts in the main mold slide relative to each other, and exposing the joint surfaces of the inserts as sliding surfaces. It is an object of the present invention to solve the above-mentioned problems and to provide an excellent casting mold by effectively degassing during casting. After a predetermined molding is completed in the clamped mold, a plurality of inserts forming an open cavity of the mold are slid relative to each other to expose the sliding movement of the inserts, and the sliding surface is exposed. The attached foreign matter is removed, and then the insert I 1J is set to form a predetermined cavity and the mold is clamped, so that the gas generated during molding can smoothly flow out from the gap in the sliding movement. The main points are as follows.

Next, one embodiment of the present invention will be described below based on the drawings.

The IFi casting mold constitutes the gist of this invention,
For example, a movable mold 3 that can be clamped and opened on a fixed mold 2 is formed. Also, an outer insert 5 is placed in a main mold 4 that forms the outer frame of the movable mold 3. is mounted with a sliding surface 6 bored inside thereof and a sliding guide 7.7 protruding therefrom,
On the other hand, the core insert 8 is erected between a flange 9 having an equal gap around the sliding surface 6, and a groove 10.10 is bored through which the flange 9 can fit and slide with the sliding guide 7.7. 11.11 and the bracket 11
,! A boss 13 into which an insert +2e can be set is protrudingly provided on the flange 9 facing the l, a cavity 14 is formed by the outer insert 5 and the inner insert 8, and the sliding movement 6 and the flange 9 are Gas vent passage 1 with a gap between it and surface 6'
5 is formed.

Then, the inner insert 8 is engaged with the piston 17 of the hydraulic cylinder 16 as an actuator attached to the main mold 4, and the piston 170 strokes and the sliding surface 6' of the flange 9 is exposed. is made possible.

In the above configuration, when a predetermined amount of molten metal is poured into the cavity 14 while the movable mold 3 is clamped to the fixed mold 2, a gap is formed between the outer insert 5 and the inner insert 8. Gas vent 15
The gas in the cavity 14 escapes and a predetermined casting is formed.

After solidification of the casting over time is completed, the movable mold 3 is raised by a lifting device (not shown) to open the mold, and the casting molded in the cavity 14 is taken out.

Next, a hydraulic supply/discharge device (not shown) is operated to supply oil to the hydraulic cylinder 16 as shown by the arrow in FIG.
7e, the inner insert 8 is regulated by the sliding guide 7.7 provided on the outer insert 5 and slid into the cavity 14, and the piston 17
The sliding movement 6' of the insert 8 is exposed at the stroke end.

In this state, foreign substances such as mold release agent adhering to the sliding surface 6' are removed by high-pressure gas cleaning, and the insert 12 is installed in a predetermined position around the boss 13 of the inner insert 8, and then the hydraulic cylinder The piston 17 of 16 is moved back and the inner insert 8 is slid back to form the cavity 14 again.

Then, a mold release agent is applied to the cavities 14 of the movable mold 3 and the fixed mold 2, and the molds are clamped again to perform a new casting operation. Foreign matter removal may be carried out at predetermined casting cycle intervals. In this way, pouring, molding, opening the mold, removing the cast, ejecting the core, inserting the insert, reloading the core, applying mold release agent, and clamping the mold are performed. Recycled.

It goes without saying that the embodiments of this invention are not limited to the above-mentioned embodiments. For example, the actuator is not limited to a hydraulic cylinder, and the mold may also be a die-cast mold (furthermore, a foreigner may be used). Various aspects can be adopted, such as being able to protrude and slide.

As described above, according to the present invention, in the casting mold, at least one of the outer core and the inner core forming the insert in the main mold is formed to be movable with respect to the main mold. This has the advantage that it is easy to install and assemble the two bodies, and therefore, overhaul can be carried out easily.

In addition, since the sliding surfaces of the two bodies form a guide, the relative sliding of the two bodies is regulated in direction, so there is an advantage that the body protrudes in a stable posture and slides back reliably. Since the sliding surface forms a gas vent path, there is no need to specially provide a gas vent path in the main mold (therefore, constraints on mold design are reduced;

The excellent effect of being able to adequately handle molded products with complex shapes is achieved.

Further, by the relative sliding of the two members, the sliding surface is exposed, and foreign matter adhering to the sliding surface, which serves as a gas vent, can be easily removed.

Clogging of the casing can be prevented and gas can flow out smoothly.
As a result, not only the product defect rate is reduced, but also product management becomes easier, leading to excellent effects such as cost reduction.

In addition, there is an advantage that the insert can be installed reliably and easily because the two members protrude relative to each other by sliding relative to each other.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective explanatory view of the embodiment, FIG. 2 is a front sectional explanatory view of the embodiment, and FIG. Figure 4 is the TV in Figure 2.
-IV cross-sectional explanatory diagram. 4... Main type, 5.8... Nesting, 5...
・Foreign child, 8... Middle child. 15...Gas vent, 1--Casting mold, 616
'...Sliding surface, 7.11...Guide applicant
Toyota Motor Corporation Figure 1\-/

Claims (1)

[Claims] In a casting mold in which the insert provided in the main mold is composed of an outer insert and an inner insert, and a gas vent is formed between the two inserts, the outer insert and the inner insert are A casting mold characterized in that one of the inserts is movable relative to the main mold, and the sliding surfaces of both inserts form a guide and a gas vent.