CN209773394U - A casting system for castings with isolated hot spots - Google Patents

Abstract

The utility model relates to a casting system for castings with isolated thermal joints, comprising a cavity and a sprue cup, the interior of the cavity is divided into two product cavities by the same sand core, and the bottom of the sprue cup is connected There is a sprue, and the bottom of the sprue is connected with a feeding riser; the lower side wall of the feeding riser is provided with two ingates in parallel, and the two ingates are respectively connected with two product types. The upper side of the cavity is connected, and the position of the ingate is adjacent to the hot spot of the product cavity; the two sides of the horizontal section of any of the ingates are inclined to each other, forming a feed from the feed riser to the product cavity The direction of the channel structure is narrowed; and the inclination angle of the side adjacent to the sand core is smaller than the inclination angle of the other side; the utility model is suitable for casting of castings with isolated hot joints, and can effectively solve the shrinkage cavity and shrinkage of hot joints of castings. Loose question.

Description

A casting system for castings with isolated hot spots

technical field

The utility model relates to the technical field of casting, in particular to a casting system for castings with isolated thermal joints.

Background technique

In traditional pouring process design, in order to solve the problem of shrinkage cavity and porosity of castings, risers are usually set at the hot joints of castings for feeding; but when the feeding riser is far away from the hot joints (there are isolated hot joints), the feeding The area between the riser and the hot joint of the casting will solidify in advance, causing the feeding channel to close in advance, and the feeding riser cannot replenish molten iron to the hot joint, resulting in shrinkage cavity and shrinkage defects in the hot joint.

For example, flat ductile iron castings (such as track backing plates) produced by vertical molding lines have isolated thermal joints, and it is difficult to directly feed the risers.

In order to solve this problem, the method of setting cold iron at the hot joint is usually used to accelerate the early solidification of the hot joint to achieve sequential solidification and solve the problem of shrinkage cavity and porosity.

Utility model content

The purpose of this utility model is to provide a casting system for castings with isolated hot joints, without the need for chillers, and to solve the problem of shrinkage cavity and porosity at hot joints of castings with a brand-new casting gate structure.

In order to achieve the above object, the utility model adopts the following technical solutions:

A casting system for castings with isolated thermal joints, comprising a cavity and a sprue cup, the interior of the cavity is divided into two product cavities by the same sand core, and a sprue is connected to the bottom of the sprue cup , the bottom of the sprue is connected with a feeding riser; the lower side wall of the feeding riser is provided with two ingates in parallel, and the two ingates are respectively connected to the upper sides of the two product cavities. connected, and the position of the ingate is adjacent to the hot spot of the product cavity; the two sides of the horizontal section of any of the ingates are inclined to each other, forming a narrowing direction from the feeding riser to the product cavity. channel structure; and the inclination angle of the side adjacent to the sand core is smaller than the inclination angle of the other side.

Preferably, there are two mold cavities, two ingates are arranged side by side on the lower side walls of the feeding riser, and the four ingates are respectively connected to the upper sides of the four product cavities.

Preferably, a filter is provided between the sprue and the feeding riser.

The beneficial effects of the utility model are as follows:

The utility model is suitable for the casting of castings with isolated hot joints, and can effectively solve the problem of shrinkage cavity and porosity at the hot joints of castings. During casting, the molten iron enters from the sprue cup, enters the feeding riser through the sprue, and the molten iron passes through The ingate on the side of the feeding riser enters the product cavity, the ingate is located on the side adjacent to the hot joint of the product, and the part of the cavity between the ingate and the hot joint is the feeding channel of the hot joint.

Because the two sides of the ingate designed in this application are inclined to each other, and the inclination angles are different, the flow direction of the molten iron will change when the molten iron flows through the ingate (when the forward force of the molten iron passes through the inclined surface, there will be There are two forces, one is the forward force and the other is the horizontal force. Because the inclination angles on both sides of the gate are different, when the molten iron flows through the two sides, the magnitude of the lateral force is different, so that the molten iron will flow according to the horizontal direction. The direction of the strong force is inclined, thereby finally changing the flow direction of the entire molten iron), so that the molten iron continuously impacts on a specific part of the sand core in the product cavity, that is, the sand core located in the feeding channel area; in this way, in the entire sand core, only This area is continuously heated by fresh high-temperature molten iron, and has the longest heating time compared to other areas, which enhances the heat storage effect of the sand core in this area, and increases the temperature of the area between the isolated hot joint and the feeding riser, thereby ensuring The unimpeded feeding channel realizes sequential solidification, solves the problem of shrinkage cavity and porosity in hot spots of castings, and improves the quality of castings.

Description of drawings

Fig. 1 is the front view of the utility model;

Fig. 2 is a perspective view of the utility model;

Fig. 3 is a sectional view along A-A direction among Fig. 1;

Fig. 4 is a schematic diagram of the flow direction of molten iron in the feeding channel of the present invention;

Among them: 1-gate cup, 2-sprue, 3-filter, 4-feeding riser, 5-ingate, 6-casting, 7-sand core, 8-heat section.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

The following embodiments and accompanying drawings are only to describe the preferred implementation of the present utility model, and are not intended to limit the scope of the present utility model. Various modifications and improvements made in the technical solution should fall within the scope of protection determined by the claims of the utility model.

Referring to Figures 1-3, a casting system for castings with isolated thermal joints, including a cavity and a sprue cup 1, the inside of the cavity is divided into two product cavities by the same sand core 7 (this The drawings of the embodiment use casting 6 instead to represent the product cavity, which is described below as casting 6), the bottom of the sprue cup 1 is connected with a sprue 2, and the bottom of the sprue 2 is connected with a feeding Riser 4.

A filter screen 3 can be added between the sprue 2 and the feeding riser 4 to filter the molten iron.

Two ingates 5 are arranged side by side on the lower side walls of the feeding riser 4, and the four ingates 5 are respectively connected to the upper sides of the four castings 6 to cast four products at a time.

The casting 6 in this embodiment is an example of a track backing plate. A track backing plate has two hot joints 8 (hot joints are generally thick and large parts in casting products), because the lower hot joint 8 is in the casting process. During the process, the casting 6 can be self-feeding, so there is generally no need to add additional feeding risers.

For the hot joint part on the upper part of the casting 6, feeding is required, so the position of the ingate 5 is set on the adjacent side of the hot joint part 8, and the feeding channel is between the hot joint part 8 and the ingate 5.

Referring to Figure 4 (the arrows in Figure 4 indicate the flow direction of molten iron during casting), the two sides of the horizontal section of the ingate 5 are inclined to each other, forming a direction from the feeding riser 4 to the casting 6. narrow channel structure; and the inclination angle β of the side adjacent to the sand core 7 is smaller than the inclination angle α of the other side.

The specific size of the inclination angles α and β are determined according to the actual design requirements. For example, the larger the value of α-β, the larger the inclination angle of the molten iron flow in Figure 4. The size of the inclination angle determines the type of product that the molten iron enters After the cavity, the specific position of the impact heating sand core 7 (area A indicated by the dotted box in FIG. 4 ), the specific skilled person in the art can calculate the most suitable angle according to the need.

In practice, when casting rail backing plate castings, the design inclination angle α is about 30°, and the inclination angle β is about 20°, which can meet the requirements.

The working principle of the utility model is as follows:

Because the two sides of the ingate 5 are inclined towards each other, and the inclination angles α and β of the two sides are different, the flow direction of the molten iron will change when the molten iron flows through the ingate 5 .

It can be seen from fluid mechanics that when the forward force of molten iron passes through the side slope of the ingate, two forces will be generated, one is the forward force and the other is the lateral force. The larger the inclination angle of the molten iron contacting the side, the The greater the lateral force generated.

Because the inclination angles α and β of the two sides of the ingate 5 are different, when the molten iron flows through the two sides of the ingate 5, the lateral forces generated respectively are different, and finally the molten iron will flow in the direction of the larger lateral force. , so as to finally change the flow direction of the entire molten iron, so that the molten iron will continue to impact a specific part of the sand core 7 in the product cavity after passing through the ingate 5 (A area, A area is the sand core located in the feeding channel area) In the whole sand core 7 like this, only this area is continuously heated by fresh high-temperature molten iron, and the heating time is the longest relative to other areas, which strengthens the heat storage effect of the sand core 7 at the A area, thereby improving the isolated heat section The temperature in the area between 8 and the feeding riser 4 can ensure the smooth flow of the feeding channel, realize sequential solidification, and solve the problem of shrinkage cavity and porosity in the hot joint of the casting.

Claims (3)

1. A casting system for a casting with isolated hot spots comprises a cavity and a sprue cup, wherein the cavity is internally divided into two product cavities by a same sand core, the bottom of the sprue cup is connected with a sprue, and the bottom of the sprue is connected with a feeding head; the method is characterized in that: the side wall of the lower part of the feeding head is provided with two inner gates in parallel, the two inner gates are respectively connected with the side surfaces of the upper parts of two product cavities, and the positions of the inner gates are adjacent to the hot junction parts of the product cavities; two side edges of the horizontal section of any inner sprue are inclined oppositely to form a channel structure which is narrowed from a feeding head to a product cavity; and the inclination angle of the side adjacent to the sand core is smaller than that of the other side.

2. a casting system for the presence of solitary hot spot castings according to claim 1, wherein: the feeding head comprises a feeding head, a feeding cavity, a feeding head and four product cavities, wherein the number of the cavities is two, two inner gates are respectively arranged on two side walls of the lower portion of the feeding head in parallel, and the four inner gates are respectively connected with the side faces of the upper portions of the four product cavities.

3. A casting system for the presence of solitary hot spot castings according to claim 1, wherein: and a filter screen is arranged between the sprue and the feeding head.