JPS609549A - How to stabilize open molds - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for stabilizing a mold that is open, made of sand or a similar material, and that consists of at least two separately manufactured mold parts.

Modern casting machines are used to produce mold parts that precisely close together with great precision, for example to form horizontally separated molds with two mold parts in pairs, or vertically moving molds. Mold sections can be manufactured using any number of molds to form a separate mold. After the mold has been closed, during the pouring and cooling belts that transport the mold to the mold opening section and during the handling of the transportation means, there is a risk of scrapping due to slight movement between the individual mold parts formed in pairs. In order to overcome this drawback, various proposals have been made to obtain interdependent stabilization of the mold parts.

Thus, in the case of molds consisting of a single two-mold part with four free sides, it is known to use a clamping jacket. These jackets are lowered onto the mold until closed with their sides, are moved with the mold at least until solidification of the casting begins, and are assembled into a number of tightly closed mold sections with horizontal or vertical separation lines. In the case of molds with molds, movable side plates or side rails are likewise used, said side plates or side rails having the ability to tighten or loosen separate sides of the mold. However, all of these proposals require significant investment and therefore operational costs, primarily due to the frequent cleaning of the jacket, side plates or rails to remove deposited mold sand. Because it has to be.

In addition f'c, in order to precisely fit the separating pins formed in one mold part into the corresponding holes in the convex part of the other, one or more Various types of locators are known, including those with integrally formed protrusions and corresponding recesses in the other mold part. In practice, this cannot be considered under all circumstances to ensure that the sliding of the mold part can be reliably ensured, and in both cases the template used when manufacturing the mold part requires special measurement means.

The method according to the invention differs from the conventional method in that the cavities adjacent to both mold parts are filled with a flowable, almost incompressible material, which is mainly dry mold material, after closing the g-shaped part. Filled with materials and sheltered.

In this case, all that is required is simply that said cavity be delimited by a stabilizing wall, and the filler material takes its shape according to this cavity, thereby accommodating the sliding movement between the mold parts. The degree of precision in forming this void is not a problem since changes in the void space are prevented. The filling material, which can be said to constitute, as it were, a self-adjusting guide hole, is very inexpensive and its positioning in the cavity after closing the portal requires only simple auxiliary devices. manual operation is unnecessary. Moreover, the filler material can be removed from the cavity before unloading of the casting if mixing with the molding sand is undesirable, or, on the contrary, can be used together with the molding material to be reused during unloading of the casting. Since it is mixed, it can be reused.

Various applications of this method will be explained in detail below with reference to the drawings.

The mold shown in Figures 1 and 2 consists of a lower half 1 and an upper half 2.
optionally manufactured and closed to form one or more cavities (not shown) in the horizontal separation line 3. FIG. 2 shows the casting port 4 for the cavity described above. The closed mold rests on a base 5 and is surrounded by a tightening jacket 6, which also rests on the base 5 and has a height defined somewhat above the horizontal separation line 3. . The inner dimensions of this jacket are defined to be somewhat larger than the lateral dimensions of the molds 1, 2, so that together with the jacket 6 they form an annular cavity 7, which can be filled with dry mold material, shot or other approximately It is partially filled with a flowable material, such as an incompressible filler material, which prevents the shape change of the cavity 7 and partly prevents the sliding of the mold parts 1 and 2, the inter-mold parts and the tightening. By suppressing the sliding between the jacket 6 and in part by reducing the wall thickness of the mold part around the mold, only lateral pressure is applied from the unsolidified casting. It contributes to the stabilization of castings by contributing to the distribution and transport of the castings.

FIG. 3 shows a linear array of molds of the same type as shown in FIGS. is placed on top. Along the sides 1i 117 of those molds are provided reinforcing walls, which are made of sheet material 8 supported by rigid strips 9, as is known, but from the cross-section of the mold without the known reinforcing walls. A slightly larger fixed spacing member may also be provided. In this way, cavities 7'' are formed along the sides of the mold, as well as cavities 7', which cavities are filled with flowable material, thereby filling the cavities with flowable material. , thus making the molds 1 and 2 stable.

Figures 1-4 show molds with outer cavities receiving stabilizing fill material that can be easily filled from the top;
The figure shows a mold with a corresponding inner cavity and therefore without an outer clamping jacket or reinforcing wall.

i+! shown in Figures 6 and 7! <The i-shaped upper half 2 includes a fixed and stable guide member 10, in the illustrated embodiment:
made in one piece and forming a rectangular frame around the cavity of the mold half and projecting somewhat relative to the separation line 3;
The associated lower mold half 1 of FIGS. 5 and 7 is designed with 12 corresponding annular groove pockets, the cross-sectional area of which is slightly smaller than the cross-sectional area of the protrusion of the frame 10. is so large that a free space can remain in the pocket surrounding this part. The filling material can be applied, for example, by suctioning through two or more outlets 14 in one trench connecting to the opposite side of the trench 12! 7. After being injected through one or more inlets 13 and filling the cavity through V-filtering, the sub-mold halves 1 and 2 are fixed together without sliding between them. .

FIG. 8 shows a similar device in a dual embodiment, having a lower part 1 and an upper part 2, both of which are attached to a fixed frame projecting into opposite parts of the pockets 12' and 12''. It has a shaped guide member 10' and a JO'' shaped guide member 10'. This
By means of ``L'', the guide members 10' and 10'' are simultaneously used to reinforce the mold ready for pouring.

Figure 9 also shows a dual device, in which case the filler material is supplied to one or more upwardly directed tunnel-shaped inlets 1.
4 into pockets 12' and 12.

A device arrangement similar to that shown in FIG. 4 uses a mold of the type described above with vertical separation lines between the individual mold sections.

[Brief explanation of drawings]

1 and 2 are side and plan views of a single horizontally separated three-part mold with an enclosing clamping jacket; FIG. 4 is a sectional view taken along the line IV-ff in FIG. 3; FIGS. 5 and 6 show the lower part of the mold and its assembly; FIG. Plans of each mold upper part,
Figure 7 shows the line ■l -Vl in Figures 5 and 6 after the mold is closed.
The cross section taken along l, No. 81F+ and FIG.
Stable modified IJ expressed by the method according to the invention
It is a cross-sectional view similar to FIG. 7 and A of the mold. Q-sign in the figure 1, 2... Mold part 3... Horizontal separation line 4... Cutting mouth weight... Base 6... Tightening jacket 7... Annular cavity 7/, 7//... ...Vacancy 8...Sheet strip 9...Rigid strip part 10, 10
', 10''...Guide plate 11...Cavity 12.
...Groove 12', 12''...pocket 13...inlet 14...outlet.

Claims (1)

[Claims] 1. At least two separately made mold parts (1, 2
) in a method for stabilizing open molds of sand or similar material, in which the cavities (7,
A method for stabilizing an open mold, characterized in that 12) is filled after closing the PJ mold part with a mostly incompressible filling material, preferably a dry mold material. 2. In order to stabilize the horizontally separated mold (1, 2) using the clamping jacket (6) arranged around the closed mold, the cavity (forced to receive the filling material) Method for stabilizing an open mold according to claim 1, characterized in that the opening is formed as a cavity between the mold part (1, 2) and at least a part of the outer surface of the mold part (1, 2).3. In order to stabilize the horizontally separated molds (1, 2) in straight rows with reinforcing walls (8) arranged along the sides of the cavities used to receive the filler material, Reinforced walls (8) and mold parts (1, 2) facing these walls
) and in part between the individual open molds are formed as cavities (7", 7'). Method for stabilizing an open mold as described. 4. In order to stabilize the horizontally separated mold (1, 2), at least one stabilizing guide (lO) is provided in at least one mold part (2), said The guide member is located at the separation line of the mold (3
) and at the separation line the other mold part (1) has a pocket ) (12) 1 for receiving the protruding part of the guide member (10), thereby forming a void around it for receiving the filling material. A method for stabilizing an open mold according to claim 1, characterized in that the method comprises: forming a hole in the open mold; 5. A frame-shaped guide member 00) and a corresponding annular pocket) (12) are used, said pocket having at least one opening 031 for the filling material and at least one opening Q41 for connection to a vacuum source. A method for stabilizing an open mold according to claim 4, characterized in that: