JPS6343740A - Vertical type shaped casting mold having net filter - Google Patents

Abstract

PURPOSE:To permit easier mounting of a net filter, etc., by forming a molten metal route shifting along the parting plane of front and rear molds and disposing the net filter to the parting plane so as to shield the shift parts of the two molds. CONSTITUTION:A vertical type shaped casting mold is constituted of the front mold 1 and rear mold 2 formed of sand molds. The sprue route 3 is recessed and provided so as to shift along the parting plane from the front mold to the rear mold 1. The net filter 10 formed of refractory fibers such as glass fibers or carbon fibers is mounted on the parting plane of the front mold 1 so as to cover the entire part of the shift parts 5a, 5b between the front mold 1 and the rear mold 2. The mounting is quickly and automatically executed by a filter mounting device consisting of a cylinder device. The filter mounting is facilitated by the above-mentioned method and the product quality is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vertical mold that is continuously molded using a dithermatic molding machine or the like.

(Prior Art and its Problems) Vertical molds that are continuously molded mainly by a dasamatic molding machine or the like are used as molds for mass production of small cast products.

This type of vertical mold with a vertically split structure also uses foamed ceramics and strainers in the molten metal flow path to remove slag, slag, etc. from the molten metal, just like a normal horizontal mold with a horizontally split structure. - It is desirable to set a filter such as a core.

However, due to the mold manufacturing takt time, it is difficult to arrange a filter body in a vertical mold, and in reality, casting is performed without using a filter body.

That is, since the mold making tact time using a desamatic molding machine or the like is as short as 10 to 15 seconds, it is difficult to install a filter body that requires a fitting operation in terms of time. Even if an attempt was made to mechanize and automate the filter installation work, filter installation machines that require a mating function would be expensive;
Furthermore, since it is difficult to increase the speed, it is difficult to apply in reality.

Further, even if the filter body is disposed in a mold, there is a problem that the filtering effect cannot be expected to be very high because the resistance to passage of the molten metal is large or the filtering ability is low.

The present invention has been made in view of the above problems, and provides a vertical mold in which a filter can be easily installed and product castings can be easily cast using healthy molten metal from which slag and the like have been removed. The purpose is to

(Means for solving the problems) The vertical molding mold of the present invention, which was designed to achieve the above-mentioned purpose, uses a mesh filter as a filter body and divides the molten metal path between the front mold and the rear mold. The reticular filter is provided on the dividing surface so as to extend from one mold to the other along the dividing surface and to shield the transition portion between the two molds in the molten metal path.

(Function) The mesh filter can be placed so as to cover the transition area between the front mold and the rear mold in the molten metal flow path, so there is no need for strict alignment.

Furthermore, since the mesh filter is thin, it can be held on the split surface of the mold simply by fitting both molds together.

Furthermore, the mesh filter has excellent molten metal filtration ability,
Slag, etc. in the molten metal can be almost completely removed, and products can be cast with clean molten metal.

(Example) Hereinafter, embodiments of the present invention will be described based on the drawings.

Figure 1 fil, +21 shows a vertical mold according to the present invention, which has a vertically split structure with a front mold 1 and a rear mold 2 formed by sand molds.

The sprue path 3 is recessed along the dividing surface between the front mold 1 and the rear mold 2, moving from the front mold 1 to the rear mold 2, and further extending from the front mold 1 to the rear mold 2.
It communicates with a runner path 4 recessed in the horizontal direction at the lower part of the runner. In the figure, 5a is a transition part between the front mold 1 and the rear mold 2 formed in the middle of the sprue path 3, while 5b is a transition part formed at the bottom of the sprue path 3. Moreover, 7 is a casting layer for connecting the runner path 4a and the casting cavity 6.

Reference numeral 10 denotes a mesh filter, which is disposed on the divided surface of the front mold 1 so as to completely shield the transition portions 5a and 5b. Note that the reticular filter 10 does not necessarily need to be disposed so as to shield all the transition parts, and the
Alternatively, it may be arranged so as to shield one of the transition parts of 5b.

1 is a push pin for temporarily fixing the mesh filter 10 to the dividing surface 2, and until the front mold 1 and the rear mold 2 are matched and the mesh filter 10 is held between the two molds, The mesh filter 10 is prevented from slipping off the dividing surface. Note that the temporary fixing means is not limited to the push bottle 11, but double-sided adhesive tape or adhesive may also be used.

The mesh filter 10 is made of fire-resistant fibers such as glass fibers and carbon fibers. When a high melting point metal molten metal such as cast iron or cast steel is used as the casting metal, it is preferable that the glass fiber has an SiO2 content of 75% by weight or more and has been previously fired and shrunk. This condition was clarified by the present inventor in Japanese Patent Application No. 60-235032, and is applicable to all types of molten cast iron (casting temperature 1200 to 1450'c) with a 5iO7 content of 75% or more. Also, using a filter that has been pre-fired and shrunk is effective in preventing casting defects such as sand pits caused by the casting sand at the filter attachment part being scraped into the molten metal due to shrinkage of the filter when the molten metal passes through. This is because it can be prevented.

The mesh filter 10 is usually coated with phenol resin or the like to impart shape retention, but the present invention has the advantage that a woven fabric woven with fire-resistant fibers can be used as is.

The opening size of the mesh filter 10 is determined by the size of the slag to be removed,
Although it depends on the size of the slag and nonmetallic inclusions, 0.4 to 4 mm2 is usually sufficient.

Next, the filter mounting device 20 shown in FIG. 2 will be explained, and the reticular filter 10 will be
We will explain how to make the mold into a mold.

The filter mounting device 20 consists of a cylinder 21 for entering and leaving the mold making line, and a filter mounting cylinder 22 provided at the rod end of the cylinder 21, and a filter suction box at the rod end of the filter mounting cylinder 22. 23 are provided.

The filter suction box 23 has a telescopic exhaust pipe 2.
4 are connected to each other, and the exhaust pipe 24 is connected to an external exhaust device such as a compressor through an opening in the guide rod 25. The suction box 23 has a hexahedral structure, and a flower for attracting a filter is provided on the front surface. In the figure, 26 is a guide pipe, through which the guide rod 25 is slidably inserted and supported. Reference numeral 27 indicates a single plate, and arrow A indicates the mold moving direction.

In order to attach the mesh filter 10 to the split surface of the front mold 1 using the filter attachment device ff20, first, a temporary fixing push pin or double-sided adhesive tape is attached to the retreating end of the egress/egress cylinder 21. The mesh filter 10 is attached to the front surface of the filter suction box 23.

Next, the cylinder 21 for egress/removal is activated to move the suction hook 23 toward the mold making line, and then the cylinder 22 for filter attachment is activated to remove the reticular filter 10 adsorbed onto the front surface of the suction box 23. The previous model 1
Press it against the dividing surface so as to cover the transition parts 5a and 5b. After the mesh filter 10 is temporarily fixed to the divided surface of the front mold 1, exhaust in the filter suction box 23 is stopped, and both cylinders 21 and 22 are returned to their original positions. This completes one cycle of the temporary fixing work of the reticular filter 10.

The cotton-like filter 10 only needs to be temporarily fixed on the mold dividing surface so as to cover the transition part of the molten metal path such as the sprue path, so there is no need for strict positioning and it can be easily installed as shown in FIG. Mechanization can be easily performed using the mounting device 20.

Next, Table 1 lists the results of casting using the vertical mold according to the present invention. For comparison, the same table also shows casting results using a vertical mold without a mesh filter as a conventional example.

The casting conditions were exactly the same except for the presence or absence of a filter.

Table 1 From Table 1, it was confirmed that when the vertical mold according to the present invention was used, the defective rate was significantly lower than that of the conventional mold.

(Effects of the Invention) As explained above, in the vertical mold of the present invention, a mesh filter is provided along the dividing plane between the front mold and the rear mold so as to shield the transition area between the two molds. Since the installation is easy and precision is not required for installation, it is possible to easily mechanize the installation of the cotton-like filter in accordance with the manufacturing toughness of the mold making machine.

Furthermore, since the mesh filter has an excellent molten metal filtration effect, it is possible to produce cast products of good quality.

[Brief explanation of the drawing]

FIG. 1 shows a cross-sectional view of the vertical mold according to the present invention, and FIG.
FIG. 2 is an explanatory plan view showing how to install a mesh filter using a filter mounting device. 1... Front mold, 2... Rear mold, 3... Sprue route, 5a
, 5b... Transition part, 10... Reticulated filter. Fig. 7 No. 67〈 Towing Officer 7 Fig. 62 No. 2 Latitude t.) Copy +5

Claims (1)

[Claims] (1) The molten metal path 3 is recessed along the dividing surface between the front mold 1 and the rear mold 2, moving from one mold to the other mold, and the molten metal path 3
A vertical mold with a mesh filter, characterized in that a mesh filter 10 is provided on the dividing surface so as to shield the transition parts 5a, 5b of both types.